CN217462651U - Impeller, impeller blade and centrifugal fan - Google Patents

Abstract

The application provides an impeller, impeller blade and centrifugal fan, the impeller is including holding carrier and evenly setting up a plurality of impeller blade on holding the carrier along circumference, impeller blade's number of pieces scope is [30,64], the internal diameter of impeller is A, the external diameter of impeller is B, B: the range of the ratio of A is [1.1,1.5 ]; the interval between the entrance point of two adjacent impeller blades is C, and the interval between the exit end of two adjacent impeller blades is D, C: the ratio of D ranges from [0.6,0.85 ]. The centrifugal fan and the cleaning equipment using the impeller blades or the impeller can have good aerodynamic performance and noise reduction effect, and are beneficial to improving the use experience of users.

Description

Impeller, impeller blade and centrifugal fan

Technical Field

The application relates to the technical field of fans, in particular to an impeller, an impeller blade and a centrifugal fan.

Background

The external exhaust type range hood generally has larger air volume and air pressure parameters, and the improvement of the two parameters leads to the corresponding improvement of the power and the working noise of a main motor of the range hood. For an internal circulation range hood aiming at a light oil smoke cooking scene or an external exhaust type range hood with a short public flue, the actual air volume demand is small, the waste of energy is caused by large air volume parameters, large noise is caused, and the use experience of a user is influenced.

SUMMERY OF THE UTILITY MODEL

The application provides an impeller, impeller blade and centrifugal fan to reduce the noise in the use.

The application provides an impeller, including holding carrier and evenly setting up a plurality of impeller blade on holding carrier along circumference, impeller blade's number of pieces scope is [30,64], the internal diameter of impeller is A, the external diameter of impeller is B, B: the range of the ratio of A is [1.1,1.5 ]; the interval between the entrance point of two adjacent impeller blades is C, and the interval between the exit end of two adjacent impeller blades is D, C: the ratio of D ranges from [0.6,0.85 ].

In some embodiments, the impeller has an inner diameter a in the range of [100mm,190mm ].

In some embodiments, the pitch C between the inlet ends of two adjacent impeller blades ranges from [9mm,12mm ].

In some embodiments, the impeller blade includes a body having first and second opposite ends, the first end and the carrier defining a gap therebetween, and the second end and the carrier defining a gap therebetween through which fluid passes.

In some embodiments, the blade body includes a middle section, a front section located at the first end, and a rear section located at the second end, the front section and the rear section are both isosceles trapezoids, and a height direction of the isosceles trapezoids is parallel to a length direction of the blade body.

In some embodiments, the width of the front section tapers in a direction proximate the first end: and the width of the rear section tapers in a direction towards the second end; the front section and the rear section are symmetrically arranged relative to the middle section.

In some embodiments, the base difference of the isosceles trapezoid is 2F, the height of the isosceles trapezoid is E, and the length of the middle segment is G, wherein F: the ratio range of E is [0.05,0.2 ]; e: the ratio of G is in the range of [0.2,0.5 ].

In some embodiments, the impeller blades are circular arc blades having a circular arc radius H, H: the ratio range of A is [0.2,0.3], and the central angle range of the impeller blade is [85 degrees, 130 degrees ].

Correspondingly, the embodiment of the application further provides an impeller blade, which comprises a blade body and an installation part arranged on the blade body, wherein the blade body comprises a front section, a middle section and a rear section which are arranged along the length direction of the blade body, the end part of the front section, which is far away from the middle section, is a first end, the end part of the rear section, which is far away from the middle section, is a second end, and the width of the front section is gradually reduced towards the direction close to the first end; the width of the rear section is gradually reduced towards the direction close to the second end; and the front section and the rear section are symmetrically arranged relative to the middle section.

In some embodiments, the front section and the rear section are both isosceles trapezoids, and the height direction of the isosceles trapezoids is parallel to the length direction of the blade body.

In some embodiments, the base difference of the front section and the rear section is 2F, the height of the front section and the height of the rear section are E, and the length of the middle section is G, wherein F: the ratio range of E is [0.05,0.2 ]; e: the ratio of G is in the range of [0.2,0.5 ].

In some embodiments, the impeller blade is a circular arc blade, the circular arc radius of the impeller blade is H, and the inner diameter of the impeller blade is a, H: the ratio range of A is [0.2,0.3], and the central angle range of the impeller blade is [85 degrees, 130 degrees ].

Correspondingly, this application still provides an impeller blade, including blade and the installation department of setting on blade, blade includes the edge anterior segment, middle section and the back end that the length direction of blade arranged, the anterior segment is kept away from the tip in middle section is first end, the back end is kept away from the tip in middle section is the second end, wherein, the width of anterior segment is to being close to the direction convergent of first end, the width of back end is to being close to the direction convergent of second end, and, the anterior segment with the back end for the middle section symmetry sets up.

Accordingly, the present application also provides a centrifugal fan comprising a collector, a volute having a fluid inlet and a fluid outlet, and an impeller, the collector being disposed at the fluid inlet, the impeller being disposed within the volute. The volute comprises a body, a volute tongue and an outlet part, wherein the body is in a spiral line shape and is provided with a third end, a fourth end and an accommodating space for accommodating the impeller, the fluid inlet is arranged at the center of the spiral line and is communicated to the accommodating space, the third end is a starting point of the spiral line, the fourth end is a terminal point of the spiral line, and an opening communicated with the accommodating space is formed between the third end and the fourth end; the volute tongue is disposed at the third end; the outlet portion has an outlet passage therein communicating with the opening, the fluid outlet being located at an outer end of the outlet passage, the outlet passage having a first side wall and a second side wall located on opposite sides, the first side wall extending outwardly from the volute tongue, the second side wall extending outwardly from the fourth end.

The first side wall and the second side wall are inclined towards one side close to the impeller, and the inclination angle of the first side wall is larger.

In some embodiments, the tangential direction of the fourth end is a first direction; the included angle between the first side wall and the first direction has a value range of [10 degrees and 45 degrees ], and the included angle between the second side wall and the first direction has a value range of [5 degrees and 25 degrees ].

The application has the following beneficial effects: the application provides an impeller, impeller blade and centrifugal fan, through carrying out optimal design to the structure and the parameter of a plurality of aspects such as shape, quantity, spiral case structure to air inlet impeller blade, fluidic flow is more stable difficult for taking place the turbulent flow when using, has ensured that centrifugal fan and the cleaning equipment who use this impeller blade or impeller can have good aerodynamic performance and noise reduction, helps improving user's use and experiences.

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 shows an exemplary structural representation of an impeller blade.

Fig. 2 shows an exemplary top view of an impeller blade.

Fig. 3 shows an exemplary structural diagram of the impeller.

Fig. 4 illustrates a front view of the impeller.

Fig. 5 shows an exemplary arrangement of the impeller blades.

Fig. 6 schematically shows the structure of the centrifugal fan.

Fig. 7 shows an exemplary front view of a centrifugal fan.

Fig. 8 schematically shows the structure of the back of the centrifugal fan.

The main components in this application are numbered as follows:

impeller blade 100 body 521

Front plate 5211 of 110 volute of blade body

Front section 111 and third end 52111

Middle section 112 fourth end 52112

Rear 113 volute backplate 5212

First end 114 volute shroud 5213

Second end 115 fluid inlet 5214

Mounting part 120 volute tongue 522

Outlet 523 of impeller 300

Carrier 310 fluid outlet 5231

First side wall 5232 of front plate 311

Second sidewall 5233 of back plate 312

Mounting flange 320 enclosure wall 5234

First mounting bracket 524 of bushing 330

Second mounting frame 525 of centrifugal fan 500

Mounting hole 5251 of current collector 510

Volute 520 motor 530

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless otherwise specified, the use of directional terms such as "upper", "lower", "left" and "right" generally refer to upper, lower, left and right in the actual use or operation of the device, and specifically to the orientation of the drawing figures.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

The present application provides an impeller blade, an impeller, and a centrifugal fan, which will be described in detail below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to related descriptions of other embodiments for parts that are not described in detail in a certain embodiment.

Referring to fig. 1, an embodiment of the present application provides an impeller blade 100, which includes a blade body 110 and a mounting portion 120 disposed on the blade body 110.

The blade body 110 includes a front section 111, a middle section 112, and a rear section 113, and the front section 111, the middle section 112, and the rear section 113 are arranged along a length direction X of the blade body 110. The end of the front section 111 away from the middle section 112 is a first end 114, and the end of the rear section 113 away from the middle section 112 is a second end 115. Here, the front section 111 and the rear section 113 are symmetrically disposed with respect to the middle section 112, i.e., symmetrically disposed on both sides of the center line Z of the middle section 112. Due to the symmetrical arrangement, the front section 111 and the rear section 113 can achieve similar flow guiding effects, so that the movement of fluid is more balanced, and the occurrence of turbulent flow is reduced. Meanwhile, in this embodiment, the front section 111 and the rear section 113 are both isosceles trapezoids, and the height direction of the isosceles trapezoid is parallel to the length direction of the blade body 110. Here, taking the front section 111 as an example for description, one end of the front section 111 is a first end 114, the first end 114 is an upper base of an isosceles trapezoid, the other end of the front section 111 close to the middle section 112 is a lower base of the isosceles trapezoid, and a difference between lengths of the upper base and the lower base is a base difference 2F. The height of the isosceles trapezoid is E, the length of the middle segment 112 is G, where F: e is in the range of [0.05,0.2], E: the ratio of G is in the range of [0.2,0.5 ]. Illustratively, F: the ratio of E may be 0.05, 0.07, 0.09, 0.1, 0.13, 0.15, 0.17, 0.19, 0.2, etc., E: the ratio of G may be 0.2, 0.22, 0.25, 0.29, 0.3, 0.35, 0.4, 0.5, etc. It should be noted that, in all the value examples in this specification, only a part of the preset value range is listed, and not all the values are listed, and the description will not be repeated below.

Here, the blade body 110 is tapered toward both ends, so that after the impeller blade 100 is mounted to the carrier 310 through the mounting portion 120 (see fig. 4, details of which will be described later), a gap through which a fluid can pass exists between both sides of the end of the impeller blade 100 and the carrier 310, which helps to reduce flow resistance of the fluid and reduce noise. Without this gap, a dead angle is formed between the end of the impeller blade 100 and the carrier 310, which tends to cause the fluid to peel off and create turbulence, and the fluid will continuously impact the impeller blade 100 and the carrier 310, which both causes greater noise and affects the service life of the impeller blade 100 and the carrier 310. In this embodiment, the end of the impeller blade 100 is tapered to provide smooth transition guidance for the fluid, which facilitates the fluid to move toward the middle section 112 of the blade body 110 rather than being collected at both ends, and also forms a gap between the end of the impeller blade 100 and the carrier 310, through which the fluid can leave the end, avoiding turbulence due to dead corners.

It is understood that, in other embodiments, the front section 111 and the rear section 113 may not be isosceles trapezoids, but only the width of the front section 111 is tapered toward the first end 114, and the width of the rear section 113 is tapered toward the second end 115, so that a gap may be formed between the impeller blade 100 and the carrier 310, for example, both side edges of the front section 111 may be arc-shaped edges gradually converging toward the first end 114. And in other embodiments, the front section 111 and the rear section 113 may be arranged asymmetrically, but the fluid guiding effect will generally be more balanced when arranged symmetrically.

The mounting portion 120 is used to mount the impeller blade 100 on the bearing member 310, and here, with continued reference to fig. 1, the mounting portion 120 is a protrusion, and correspondingly, a recess is formed on the bearing member 310, and the protrusion can be matched with the recess to facilitate mounting. It is understood that the present embodiment does not limit the specific structure of the mounting portion 120, in other embodiments, the mounting portion 120 may also be a recess, and the carrier 310 may also be provided with a protrusion.

In some embodiments, the impeller blades 100 are of the general variety having airfoil, flat and circular shapes. As shown in fig. 2, the impeller blade is an arc-shaped blade, which is a substantially arc-shaped sheet structure, and the radius of the arc of the impeller blade 100 is H. Typically, the impeller blades 100 are mounted on the impeller 300, and the inner diameter of the impeller 300 on which the impeller blades 100 are mounted is a (see fig. 4), H: the ratio of a ranges from [0.2,0.3], illustratively, H: the ratio of a may be 0.2, 0.21, 0.23, 0.245, 0.25, 0.27, 0.29, 0.3, etc. The central angle θ of the impeller blade 100 ranges from [85 °,130 ° ], and illustratively, the central angle θ may be 85 °,87 °,90 °,100 °,110 °,125 °,130 °, and so on. Here, the selection of circular arc blade and the setting of its specific parameter help reducing the flow resistance in wind channel to make the noise when using less, and then can improve the use experience.

Generally, the impeller blade 100 can be used in an impeller 300, and accordingly, referring to fig. 3, the present embodiment also provides an impeller 300. The impeller 300 includes a carrier 310 and a plurality of impeller blades 100 uniformly arranged on the carrier 310 in a circumferential direction.

Here, the carrier 310 is used to mount the impeller 300. In the present embodiment, please refer to fig. 3, as the same as the bearing 310 of the conventional blower, the bearing 310 includes a housing composed of a front disk 311, a rear disk 312, a hub (not shown), and the like, and the impeller blade 100 is installed in the housing through the installation portion 120. Also, in fig. 3, the impeller 300 further includes a mounting flange 320 and a shaft sleeve 320, and the mounting flange 320 and the shaft sleeve 320 are disposed on a side of the casing close to the rear disk 312 for connecting to a driving member such as a motor 530.

Here, if the number of the impeller blades 100 is set too small, the impeller blades 100 divide and squeeze the fluid less, and the flow loss is small accordingly, but the wind pressure is insufficient. When the number of the impeller blades 100 is too small, the gap between the adjacent impeller blades 100 is too large, which causes a phenomenon of fluid separation, and the fluid does not move along the guide of the impeller blades 100 any more, and is liable to generate turbulence or the like, thereby increasing noise during the movement of the fluid. If the number of the impeller blades 100 is too large, the gap between the adjacent impeller blades 100 is narrow, so that the frictional resistance when the fluid moves increases, resulting in an increase in flow loss. Moreover, as the number of the impeller blades 100 increases, the effect of increasing the wind pressure is gradually reduced, which is not economical. And also adds weight to the impeller 300 and also adds cost. Therefore, in the present embodiment, the number of the impeller blades 100 is in the range of [30,64], and for example, the number of the impeller blades 100 may be 30, 31, 33, 35, 40, 50, 62,64, and the like.

Referring to fig. 4, the inner diameter of the impeller blade 100 is a, the outer diameter of the impeller blade 100 is B, B: the ratio of a ranges from [1.1,1.5], which can be, for example, 1.1,1.2,1.25,1.27,1.3,1.4,1.5, etc.

The number of the impeller blades 100 and the design of the corresponding size are suitable, noise is reduced, requirements of wind pressure and flow are met, and the impeller blade is particularly suitable for use scenes with small flow. Moreover, the impeller blades 100 are reasonable in number, which contributes to cost reduction in a reasonable range, and contributes to weight reduction of the impeller 300 to meet the demand for weight reduction.

In some embodiments, referring to fig. 5 again, the distance between the inlet ends of two adjacent impeller blades 100 is C, the distance between the outlet ends of two adjacent impeller blades 100 is D, C: the ratio of D ranges from 0.6,0.85, which may be, for example, 0.6,0.61,0.63,0.67,0.8,0.85, etc. This embodiment is to the reasonable setting of the interval at the entrance end and the interval of exit end between two adjacent impeller blades 100 for the flow of fluid is more stable, is difficult for producing the turbulent flow, and then can reduce the noise when using.

In some embodiments, referring to fig. 4, where the requirement of the intake air is small, the inner diameter a of the impeller blade 100 is in the range of [100mm,190mm ], and may be 100mm,105mm,115mm,160mm,190mm, and the like, for example.

Referring again to fig. 5, the distance C between the inlet ends of two adjacent impeller blades 100 is in the range of [9mm,12mm ], and may be, for example, 9mm,9.3mm,9.8mm,11mm,12mm, etc.

Similarly, the design makes the fluid flow more stable and less prone to turbulence, thereby reducing noise during use. Here, combine aforementioned structure, the impeller can guarantee sufficient wind pressure requirement under the condition that has less flow, is particularly useful for the range hood under light oil cigarette culinary art scene or the short scene of public flue, can improve user's use and experience, can reduce the waste of the energy again.

The impeller 300 is generally used for the centrifugal fan 500, and accordingly, referring to fig. 6, the present embodiment further provides a centrifugal fan 500, wherein the centrifugal fan 500 includes a collector 510, a volute 520 and the impeller 300.

Wherein the collector 510 is used for guiding the fluid to uniformly fill the inlet of the impeller 300 with less resistance loss, and the collector 510 has a cylindrical, conical, and conical arc shape, etc., which is not limited by the embodiment.

The volute 520 serves to collect and guide the fluid flowing out of the impeller 300. In this embodiment, the volute 520 includes a body 521, the body 521 includes a front volute plate 5211, a rear volute plate 5212 and a surrounding volute plate 5213, the front volute plate 5211 and the rear volute plate 5212 are disposed opposite to each other, the surrounding volute plate 5213 is disposed between the front volute plate 5211 and the rear volute plate 5212, and the front volute plate 5211, the rear volute plate 5212 and the surrounding volute plate 5213 form an accommodating space. Here, the body 521 is disposed in a spiral shape, and particularly, the volute front plate 5211 and the volute rear plate 5212 are disposed in a spiral shape. Generally, a helix refers to an archimedes helix. Wherein the volute front plate 5211 and the volute back plate 5212 are substantially identical in shape. Here, taking the volute front plate 5211 as an example, please refer to fig. 7, the volute front plate 5211 has a third end 52111 and a fourth end 52112, the third end 52111 is the starting point of the spiral line, and the fourth end 52112 is the ending point of the spiral line. Here, an opening is formed between the third end 52111 and the fourth end 52112 of the volute front plate 5211 and the volute rear plate 5212, and the opening is communicated to an accommodating space provided in the body 521. Referring to fig. 6, in the present embodiment, the centrifugal fan 500 adopts a single-side air inlet arrangement, so that air inlet is smoother, and occurrence of a shunting phenomenon, a turbulence phenomenon, and collision is reduced. Thus, the volute back plate 5212 differs from the front housing back plate in that a fluid inlet 5214 is also provided at the volute front plate 5211, while no fluid inlet is provided on the volute back plate 5212. Here, the fluid inlet 5214 is disposed at the center of the spiral line and is communicated to the accommodating space, the front side of the fluid inlet 5214 is provided with the collector 510, and in use, the fluid is collected and guided by the collector 510 and then enters the accommodating space accommodating the impeller 300 through the fluid inlet 5214. Referring to fig. 8 again, in the present embodiment, a first mounting frame 524 and a second mounting frame 525 are further disposed on the volute casing rear plate 5212, the first mounting frame 524 is used for mounting and fixing the volute casing 520, and a mounting hole 5251 is disposed on the second mounting frame 525 and used for connecting and mounting a driving component such as a motor 530.

Referring again to FIG. 7, the volute 520 also includes a volute tongue 522. As will be appreciated by those skilled in the art, the volute tongue 522 includes three types, a flat tongue, a shallow tongue and a deep tongue. Wherein, when the tip of the volute tongue 522 is closer to the impeller 300, the tip is a deep tongue; when the distance between the tip of the volute tongue 522 and the impeller 300 is moderate, the distance is a shallow tongue; when the tip of the volute tongue 522 is far from the impeller 300, it is a flat tongue. In this embodiment, the type of volute tongue 522 selected is a shallow tongue.

Referring again to fig. 6, the volute 520 further includes an outlet portion 523, and the outlet portion 523 is used for allowing the fluid to exit the centrifugal fan 500. Here, the outlet portion 523 has an outlet passage therein communicating with the opening, the outer end of the outlet passage is a fluid outlet 5231, the outlet passage has a first side wall 5232 and a second side wall 5233 (see fig. 7) at opposite sides thereof and a surrounding wall 5234 (see fig. 6) connected between the first side wall 5232 and the second side wall 5233, and the first side wall 5232, the second side wall 5233 and the surrounding wall 5234 together define the outlet passage. Here, the fluid within the accommodating space may exit via the outlet passage and the fluid outlet 5231.

Referring to fig. 7, the first side wall 5232 extends outwardly from the outer end of the volute tongue 522, the second side wall 5233 extends outwardly from the fourth end 52112, and both the first side wall 5232 and the second side wall 5233 are inclined to a side close to the impeller 300, i.e., to the right in fig. 7. Here, the first and second sidewalls 5232 and 5233 are obliquely arranged such that the direction of fluid flow in the outlet passage is joined with the direction of fluid flow in the volute 520. In the prior art, the outlet channel arranged in a straight line shape is not matched with the flowing direction of the fluid in the volute 520, the fluid still has a moving trend of rotating close to one side of the impeller 300 after leaving the volute 520, and the straight outlet channel obstructs the movement of the air flow, so that the fluid collides with the side wall of the outlet channel, turbulence is generated, and the like, and great noise is caused. In this embodiment, the outlet flow direction of the fluid in the outlet channel is inclined toward the side near the impeller 300, so that the collision between the fluid and the side wall of the outlet channel is reduced, which helps to reduce local turbulence. And this arrangement makes it easier for the fluid to converge on the side close to the impeller 300 where the fluid is relatively more concentrated and the loss of wind pressure is less.

With continued reference to fig. 7, the tangential direction of the fourth end 52112 in fig. 7 is a first direction X1, and the included angle β between the first sidewall 5232 and the first direction is in the range of [10 °,45 ° ], which can be, for example, 10 °,15 °,25 °,38 °,45 °, etc. The angle α between the second sidewall 5233 and the first direction can range from [5 °,25 °, and can illustratively be 5 °,7 °,15 °,21 °,25 °, etc. Here, if the included angle β is small, the sectional area of the fluid outlet 5231 is gradually reduced, and the fluid is locally turbulent and blocked after being converged, which is not favorable for reducing noise. In this embodiment, the included angle β is set to be larger than the included angle α, so that the sectional area of the fluid outlet 5231 is larger, and a suitable angle range between the two is limited, which is helpful to reduce noise more effectively.

The centrifugal fan 500 can be used in a cleaning device such as a range hood, and accordingly, the present embodiment also provides a cleaning device having the centrifugal fan 500. The detailed structure is not described again.

Application example 1

In a first application example, an impeller blade 100 is provided, where the impeller blade 100 includes a blade body 110, the blade body 110 includes a front section 111, a middle section 112, and a rear section 113 arranged along a length direction of the blade body 110, the front section 111 and the rear section 113 are both in an isosceles trapezoid shape, a height direction of the isosceles trapezoid is parallel to the length direction of the blade body 110, a bottom difference between the front section 111 and the rear section 113 is 2F, heights of the front section 111 and the rear section 113 are both E, and a length of the middle section 112 is G, where F: the ratio range of E is [0.05,0.2 ]; e: the ratio of G is in the range of [0.2,0.5 ].

Application example two

In the second application example, there is provided an impeller 300, a carrier 310 of the impeller 300 and a plurality of impeller blades 100 uniformly arranged on the carrier 310 along the circumferential direction, the number of the impeller blades 100 is in the range of [30,64], the inner diameter of the impeller 300 is a, the outer diameter of the impeller 300 is B, B: the ratio of A is in the range of [1.1,1.5 ].

Application example three

In a third application example, there is provided a centrifugal fan 500 comprising a collector 510, a volute 520 and an impeller 300, the volute 520 having a fluid inlet 5214 and a fluid outlet 5231, the collector 510 being disposed at the fluid inlet 5214; the impeller 300 is disposed within the volute 520; the flow direction of the fluid at the fluid outlet 5231 is inclined to a side close to the impeller 300. Also, the volute 520 has a first sidewall 5232 and a second sidewall 5233 opposite at the outlet portion 523, the included angle between the first sidewall 5232 and the first direction X1 is in the range of [10 °,45 ° ], and the included angle between the second sidewall 5233 and the first direction X1 is in the range of [5 °,25 ° ].

Application example four

In a fourth application example, there is provided a hood having a structure of at least one of the first to third application examples.

It should be understood that the terms in the foregoing embodiments have the same meanings, and specific implementation details that are not described in some embodiments may refer to descriptions in other embodiments, so that example descriptions and technical effects shown in the foregoing embodiments can be correspondingly implemented, and repeated parts are not described again in this specification.

The impeller, the impeller blade and the centrifugal fan provided by the application are described in detail above, and a specific example is applied in the description to explain the principle and the implementation of the application, and the description of the above example is only used to help understanding the method and the core idea of the application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (11)

1. An impeller, characterized in that, including supporting the piece and a plurality of impeller blades that evenly set up on supporting the piece along circumference, the number range of impeller blade is [30,64], the internal diameter of impeller is A, the external diameter of impeller is B, B: the range of the ratio of A is [1.1,1.5 ]; the interval between two adjacent impeller blade's the entrance point is C, and the interval between two adjacent impeller blade's the exit end is D, C: the ratio of D ranges from [0.6,0.85 ].

2. The impeller according to claim 1, characterized in that the inner diameter a of the impeller is in the range [100mm,190mm ].

3. The impeller according to claim 1, wherein the pitch C between the inlet ends of two adjacent impeller blades ranges from [9mm,12mm ].

4. The impeller according to any of claims 1-3, wherein the impeller blade comprises a blade body having opposite first and second ends, the first end and the carrier member forming respective gaps therebetween through which fluid passes.

5. The impeller of claim 4, wherein said blade body includes a middle section, a front section at said first end and a rear section at said second end, said front section and said rear section each having an isosceles trapezoid shape, and wherein a height direction of said isosceles trapezoid is parallel to a length direction of said blade body.

6. The impeller of claim 5, wherein the width of the forward section tapers in a direction proximate the first end: and the width of the rear section tapers in a direction towards the second end; the front section and the rear section are symmetrically arranged relative to the middle section.

7. The impeller according to claim 5, wherein said isosceles trapezoid has a base difference of 2F, a height of E, and a length of G in said middle section, wherein,

f: the ratio range of E is [0.05,0.2 ];

e: the ratio of G is in the range of [0.2,0.5 ].

8. The impeller according to any of claims 1 to 3, wherein the impeller blades are circular arc blades having a circular arc radius of H, H: the ratio of A is in the range of [0.2,0.3], and the central angle of the impeller blade is in the range of [85 degrees, 130 degrees ].

9. An impeller blade is characterized by comprising a blade body and a mounting part arranged on the blade body, wherein the blade body comprises a front section, a middle section and a rear section which are arranged along the length direction of the blade body, the end part of the front section, far away from the middle section, is a first end, the end part of the rear section, far away from the middle section, is a second end, wherein,

the width of the front section tapers in a direction towards the first end, the width of the rear section tapers in a direction towards the second end, and the front section and the rear section are symmetrically arranged relative to the middle section.

10. A centrifugal fan is characterized by comprising,

a current collector;

an impeller; and

a volute having a fluid inlet at which the collector is disposed and a fluid outlet within which the impeller is disposed, the volute further comprising,

the body is in a spiral line shape and is provided with a third end, a fourth end and an accommodating space for accommodating the impeller, the fluid inlet is arranged at the center of the spiral line and communicated to the accommodating space, the third end is the starting point of the spiral line, the fourth end is the terminal point of the spiral line, and an opening communicated with the accommodating space is formed between the third end and the fourth end;

a volute tongue disposed at the third end; and

an outlet portion having an outlet passage therein communicating with said opening, said fluid outlet being located at an outer end of said outlet passage, said outlet passage having a first sidewall and a second sidewall on opposite sides, said first sidewall extending outwardly from said volute tongue and said second sidewall extending outwardly from said fourth end;

the first side wall and the second side wall are inclined towards one side close to the impeller, and the inclination angle of the first side wall is larger.

11. The centrifugal fan of claim 10,

the tangential direction of the fourth end is a first direction;

the included angle between the first side wall and the first direction has a value range of [10 degrees and 45 degrees ], and the included angle between the second side wall and the first direction has a value range of [5 degrees and 25 degrees ].

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