Centrifugal exhaust fan wind wheel and exhaust fan

Abstract

The utility model discloses a centrifugal exhaust fan wind wheel and an exhaust fan, and the wind wheel comprises a plurality of blades, a plurality of blades and a plurality of blades, a mounting area is reserved in the radial center of the wheel carrier, the wheel carrier is connected to the middles of all the blades in the length direction, all the blades have the same radian, all the blades are circumferentially and evenly distributed around the central axis of the wheel carrier, and the connecting line of the two ends of the inner arc side of each blade is collinear with the diameter of the wheel carrier; the spoke is located in the installation area and connected to the wheel carrier, and the spoke is provided with a shaft hole in the position of the central axis of the wheel carrier. Compared with the prior art, due to the fact that the wheel frame is connected to the middles of all the blades, the gravity center of the wind wheel can coincide with the rotation center of the wind wheel, and the vibration and deformation risks during high-speed rotation are reduced; due to the fact that the connecting line of the two ends of the inner arc side of each blade is collinear with the diameter of the wheel frame, the radian of each blade can be designed to be larger, the air inlet amount in unit time can be improved, generation of vortexes can be reduced, and the efficiency of the wind wheel is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ventilation equipment, especially centrifugal exhaust fan wheel and exhaust fan. BACKGROUND

[0002] Ceiling in the field of home decoration is more and more popular, and the installation of exhaust fan on the ceiling can effectively improve the quality of indoor air, especially for the washroom, the exhaust fan can not only exhaust indoor air to the outside, achieve the effect of deodorization, but also can take away the indoor humidity, realize the function of dehumidification.

[0003] At present, the product quality of exhaust fan is mainly determined by the motor and the fan wheel, and the motor is a mature industrial product, which is generally purchased from a motor factory. In order to improve the quality of the exhaust fan, in addition to selecting high-quality motors, it is more important to improve the structure of the fan wheel. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a centrifugal exhaust fan wheel different from the prior art.

[0005] The centrifugal exhaust fan wheel according to the first aspect of the utility model comprises:

[0006] Blades, the number of which is provided with multiple;

[0007] A wheel carrier, a mounting area of which is reserved at the radial center, the wheel carrier is connected at the middle part of the length direction of all blades, each blade has the same radian, all blades are circumferentially distributed around the central axis of the wheel carrier, and the line connecting the two ends of the inner arc side of each blade is collinear with the diameter of the wheel carrier.

[0008] A wheel spoke, which is located in the mounting area and connected to the wheel carrier, and the wheel spoke is provided with a shaft hole at the central axis of the wheel carrier.

[0009] The centrifugal exhaust fan wheel according to the utility model has at least the following beneficial effects: when the existing fan wheel rotates, the wind vibration is obvious, the airflow is scattered, and the noise is large. Compared with the prior art, all blades of the present technology are arranged in the air at the two ends of the length direction, which reserves the technical basis for adjusting the blade structure. Since the wheel carrier is connected at the middle part of all blades, it is beneficial to the coincidence of the gravity center of the fan wheel and the rotation center of the fan wheel, so as to reduce the vibration and deformation risk in high-speed rotation. Since the line connecting the two ends of the inner arc side of each blade is collinear with the diameter of the wheel carrier, the radian of the blade can be designed to be larger, which is beneficial to improve the air intake per unit time, and can also reduce the generation of eddy current, thereby improving the efficiency of the fan wheel.

[0010] According to some embodiments of the utility model, each blade is provided with a wind guide tip at both ends in length direction, the width of the wind guide tip decreases in the direction away from the radial surface of the wheel carrier, and the length of the wind guide tip increases in the direction close to the center axis of the wheel spoke. The wind guide tip is used to reduce the turbulent flow noise when the airflow separates, and the decreasing width of the tip can reduce the local resistance and improve the wind pressure. The gradually changing tip design disperses the pressure at the end of the blade and prolongs the service life of the blade.

[0011] According to some embodiments of the utility model, each blade is provided with two wind guide tips of the same size. The double-tip design balances the airflow on both sides, avoids vibration superposition caused by asymmetry, and can also reduce production cost through subtractive manufacturing.

[0012] According to some embodiments of the utility model, the size of each blade remains the same to facilitate unified production.

[0013] According to some embodiments of the utility model, the projection of the blade on the wheel carrier is located entirely within the wheel carrier. Through the above arrangement, the blade and the wheel carrier can be connected together with the maximum contact area, avoiding additional wind resistance caused by the outward extension of the blade, and improving the overall rigidity and reducing the risk of deformation at high speed.

[0014] According to some embodiments of the utility model, the wheel spoke is convex from the air inlet side to the mounting side in the axial direction. Through the above arrangement, the convex structure guides the airflow to smoothly enter from the air inlet side, improving the air intake efficiency.

[0015] According to some embodiments of the utility model, the wheel spoke is provided with a gasket portion on the surface of the air inlet side, and the shaft hole is communicated with the gasket portion. Compared with the external gasket, the concentricity of the gasket portion and the shaft hole is better, so as to ensure the stability of the wind wheel and the motor when connected, and effectively reduce the wind noise.

[0016] According to some embodiments of the utility model, the shaft hole is a D-shaped hole to meet the rigid connection with the motor shaft.

[0017] According to some embodiments of the utility model, the wheel spoke is provided with a plurality of air guide holes, and the wheel spoke forms a spoke between adjacent two air guide holes. Since the wheel carrier is connected to the middle part of all blades, the blades are divided into two parts by the wheel carrier. If no air guide hole is provided, all airflow will flow from one side of the wheel carrier. The provision of the air guide hole can effectively reduce the weight of the wheel spoke.

[0018] The exhaust fan according to the second aspect of the utility model comprises:

[0019] The centrifugal exhaust fan wheel described above;

[0020] A volute having a guide air chamber provided with an air inlet and an air outlet, a centrifugal exhaust fan wheel being installed in the guide air chamber, the centrifugal exhaust fan wheel having an air flow direction from the air inlet to the air outlet;

[0021] A grating plate covering the air inlet.

[0022] The additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description of the application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings.

[0024] Figure 1 is a perspective structural schematic view of the centrifugal exhaust fan wheel provided by the present application;

[0025] Figure 2 is Figure 1 a side view of the centrifugal exhaust fan wheel shown in the figure;

[0026] Figure 3 is Figure 1 a top view of the centrifugal exhaust fan wheel shown in the figure;

[0027] Figure 4 is Figure 1 a bottom view of the centrifugal exhaust fan wheel shown in the figure.

[0028] In the drawings: 100 - wheel carrier, 200 - spoke, 300 - blade, 210 - shaft hole, 220 - guide air hole, 230 - spoke, 310 - guide air tip, 240 - gasket part. DETAILED DESCRIPTION

[0029] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used only to explain the present application, and cannot be understood as a limitation of the present application.

[0030] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by the upper, lower, front, rear, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0031] In the description of the utility model, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, exceed and the like are understood as not including the number, above, below, within and the like are understood as including the number. If it is described to the first, the second is only used for distinguishing the technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0032] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood in a broad sense, and the person skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0033] As shown in Figure 1 The centrifugal exhaust fan impeller (hereinafter referred to as impeller) according to the first aspect embodiment of the utility model, it includes wheel frame 100, spoke 200 and multiple blades 300, wherein the size of all blades 300 is consistent. Different from the prior art, all blades 300 are not connected by connecting pieces at both ends in the length direction, but the wheel frame 100 is connected at the middle part of all blades 300 in the length direction. That is to say, all blades 300 are arranged in the air at both ends in the length direction, and all blades 300 are connected by the wheel frame 100 at the middle part in the length direction.

[0034] In addition, the wheel frame 100 can be selected as a circular ring structure, the radial center of which is reserved with an installation area, the spoke 200 is located in the installation area and is connected to the wheel frame 100, the spoke 200 is provided with a shaft hole 210 at the central axis of the wheel frame 100, the shaft hole 210 can be selected as a D-shaped hole, which is used for rigid connection with the motor shaft, so that the motor can drive the impeller to rotate. In the embodiment, the wheel frame 100, the spoke 200 and the multiple blades 300 are collectively formed as a plastic member, which is processed and produced through a specific mold, so as to save the connection steps between the components, thereby improving the production efficiency.

[0035] Since the wheel frame 100 is connected to the middle part of all the blades 300, the coincidence of the gravity center of the wind wheel and the rotation center of the wind wheel is facilitated to reduce the vibration in high-speed rotation. When the gravity center of the wind wheel and the rotation center of the wind wheel overlap, the vibration caused by imbalance can be reduced when the wind wheel is running, and this balanced state helps to ensure the stable operation of the wind wheel, reduces the mechanical wear and noise caused by excessive vibration. The balanced running state helps to reduce the mechanical stress inside the wind wheel, thereby reducing the wear rate of the parts to prolong the service life of the wind wheel and reduce downtime and maintenance costs due to failure. As known, vibration is one of the main causes of noise, and when the gravity center of the wind wheel and the rotation center of the wind wheel overlap, the vibration of the wind wheel can be effectively reduced, thereby reducing the noise level.

[0036] Further, the projection of the blades 300 on the wheel frame 100 is all located within the wheel frame 100, that is, the blades 300 all fall into the wheel frame 100 in the horizontal direction without extending out of the wheel frame 100, avoiding the additional wind resistance caused by the outward extension of the blades 300. Through the above arrangement, the blades 300 and the wheel frame 100 can be connected together with the maximum contact area, improving the overall stiffness and reducing the risk of deformation in high-speed rotation.

[0037] It should be further explained that the wheel spoke 200 is provided with a plurality of air guide holes 220, and the wheel spoke 200 forms a spoke 230 between any two adjacent air guide holes 220. If the number of air guide holes 220 is five, the number of spokes 230 is also five, and the shape of the spoke 230 is determined according to the shape of the air guide hole 220. The two opposite edges of the spoke 230 can be arranged in parallel or inclined, and the specific structure and number of the spoke 230 are not limited by the present application. Since the wheel frame 100 is connected to the middle part of all the blades 300, the blades 300 are divided into two parts by the wheel frame 100, and if the air guide hole 220 is not provided, all the air flow will flow from one side of the wheel frame 100 and cannot flow smoothly to all positions of the blades 300. In addition, the provision of the air guide hole 220 can effectively reduce the weight of the wheel spoke 200.

[0038] In other embodiments, the wheel frame 100, the wheel spoke 200 and the plurality of blades 300 can also be metal components, such as stainless steel components or aluminum components, but since there is no process in the metal processing field that can integrally form the above three components, the components need to be fixedly connected by welding, which has a high production cost.

[0039] As Figure 3As shown, since the size of all the blades 300 remains consistent, each blade 300 has the same curvature, and all the blades 300 are evenly distributed around the central axis of the wheel frame 100. Assuming the number of blades 300 is 20, the array angle between these blades 300 is 360° / 20 = 18°; assuming the number of blades 300 is 24, the array angle between these blades 300 is 360° / 24 = 15°, and so on.

[0040] Further, although the existing fan blades also have a certain curvature, and all the fan blades are evenly distributed in a circular ring along the axis of the circular ring, the inner arc side of the two ends of the fan blade is not collinear with the diameter of the circular ring. Compared with the prior art, the line connecting the two ends of the inner arc side of each blade 300 is collinear with the diameter of the wheel frame 100. The core of this design is to realize the synergistic effect of centrifugal force and airflow movement through precise matching of geometric symmetry and airflow path.

[0041] When the airflow flows on the surface of the blade 300, the force direction along the radial direction of the wheel frame 100 is closer to the natural motion trajectory of the airflow, reducing the impact angle of the airflow and the surface of the blade 300, thereby reducing energy loss. The uniform distribution of the blade 300 structure makes the airflow uniformly diffuse under the action of centrifugal force, avoiding the formation of vortex due to local high speed or low speed. In the prior art, the airflow may produce secondary flow due to the mismatch between the bending direction of the fan blade and the direction of the centrifugal force. The bending direction of the blade 300 is aligned with the motion path of the airflow being thrown out, and through geometric alignment, such flow direction is suppressed, improving energy conversion efficiency. Moreover, the line connecting the two ends of the inner arc side of the blade 300 is collinear with the diameter of the wheel frame 100, so that the boundary layer is more stable when the airflow flows on the surface of the blade 300, avoiding energy loss and noise caused by airflow separation. Compared with the prior art, the optimization of the present application can improve the uniformity of the airflow and reduce the turbulent energy loss by about 15%-20%.

[0042] At the same time, since the line connecting the two ends of the inner arc side of each blade 300 is collinear with the diameter of the wheel frame 100, the blade 300 with a large curvature does not need to occupy more space. That is, the structure of the present application is more conducive to the arrangement of the blade 300 with a large curvature, and the application of these blades 300 makes the wind storage volume of each blade 300 larger, which is conducive to improving the air intake per unit time, thereby improving the efficiency of the wind wheel.

[0043] As Figure 2As shown, since all the blades 300 are arranged in an overhanging manner at both ends in the length direction, the utility model reserves a technical basis for adjusting the structure of the blades 300. On this basis, each blade 300 is provided with a wind guide tip 310 at both ends in the length direction, the width of the wind guide tip 310 decreases in the direction away from the radial plane of the wheel carrier 100, the length of the wind guide tip 310 increases in the direction close to the central axis of the wheel spoke 200, and each blade 300 has two wind guide tips 310 of the same size. Through the above arrangement, the blade 300 forms a projection in the shape of an isosceles trapezoid on the projection plane. The double-tip design balances the airflow on both sides, avoids vibration superposition caused by asymmetry, and also reduces production costs through subtractive manufacturing. For the wind guide tip 310 on one side, the design core is to achieve smooth transition of the airflow separation path through geometric optimization, which not only reduces turbulent noise and local resistance, but also prolongs the service life of the blade 300 through mechanical dispersion effect.

[0044] When the airflow flows through the end of the blade 300, the existing fan blade will produce strong vortex due to sudden separation of the airflow, and the design of the wind guide tip 310 can guide the airflow to transition smoothly and avoid the airflow from suddenly peeling off at the tip, thereby reducing the kinetic energy loss and noise caused by vortex formation. The tapered tip makes the airflow accelerate at the end, reduces the local static pressure, and thus reduces the frictional resistance between the end of the blade 300 and the airflow. The end of the existing fan blade is prone to stress concentration due to airflow impact and vortex vibration, and the design of the wind guide tip 310 disperses the end pressure along the length direction, reduces the risk of fatigue fracture, and reduces the dynamic impact load borne by the blade 300 when rotating at high speed by suppressing the kinetic energy of the vortex, thereby prolonging the service life of the material.

[0045] Therefore, even if the blade 300 is arranged in an overhanging manner at both ends in the length direction, the rigidity of the blade 300 will not be affected.

[0046] As shown in Figure 1 and Figure 4 , the wheel spoke 200 has an air inlet side and a mounting side on both sides in the axial direction, if the exhaust fan is installed on the ceiling, then the air inlet side of the wheel spoke 200 needs to face the indoor floor, at this time the mounting side of the wheel spoke 200 faces away from the indoor floor and faces the motor. Specifically, the wheel spoke 200 protrudes from the air inlet side to the mounting side, and the protruding structure can guide the airflow to smoothly enter from the air inlet side and form an area conducive to storing air, thereby improving the air intake efficiency.

[0047] Further, the spoke 200 is provided with a gasket portion 240 on the surface of the wind inlet side, and the shaft hole 210 is communicated with the gasket portion 240. Since the gasket portion 240 is integrally formed and is made of the same hard plastic as the spoke 200, the concentricity of the gasket portion 240 and the shaft hole 210 is better than that of the prior art with an external gasket, so as to ensure the smoothness of the wind wheel and the motor when connected and effectively reduce the wind noise.

[0048] According to the second aspect of the utility model, the exhaust fan comprises the centrifugal exhaust fan wheel according to the first aspect of the utility model, and further comprises a volute (not shown in the drawings) and a grille plate (not shown in the drawings), the volute has a wind guide chamber, the wind guide chamber is provided with an air inlet and an air outlet, the wind wheel is installed in the wind guide chamber, and the wind wheel has an airflow direction from the air inlet to the air outlet.

[0049] In addition, the volute is provided with a mounting position communicated with the air inlet, and the size of the mounting position is greater than that of the air inlet. The mounting position is used for mounting the grille plate, and at this time, the mounting position is arranged outside the air inlet. When the grille plate is mounted on the mounting position, the grille plate can completely cover the volute, so as to avoid the direct contact between external objects and the wind wheel.

[0050] Since the exhaust fan adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0051] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of ordinary skilled in the art without departing from the purpose of the utility model.

Claims

1. A centrifugal exhaust fan impeller, characterized in that, include: The blades (300) are provided in multiple quantities; The wheel frame (100) has a reserved installation area at its radial center. The wheel frame (100) is connected to the middle of the length direction of all blades (300). Each blade (300) has the same curvature. All blades (300) are evenly distributed around the central axis of the wheel frame (100). The line connecting the two ends of the inner arc side of each blade (300) is collinear with the diameter of the wheel frame (100). A spoke (200) is located in the mounting area and connected to the wheel frame (100), and the spoke (200) has a shaft hole (210) at the central axis of the wheel frame (100).

2. The centrifugal exhaust fan impeller according to claim 1, characterized in that: Each blade (300) has a guide tip (310) at both ends in the length direction. The width of the guide tip (310) decreases in the direction away from the radial surface of the wheel frame (100), and the length of the guide tip (310) increases in the direction close to the central axis of the spoke (200).

3. The centrifugal exhaust fan impeller according to claim 2, characterized in that: Each of the blades (300) has two identical air guide tips (310).

4. The centrifugal exhaust fan impeller according to claim 1 or 3, characterized in that: Each of the blades (300) has the same dimensions.

5. The centrifugal exhaust fan impeller according to claim 1, characterized in that: The projection of the blade (300) onto the wheel frame (100) is entirely within the wheel frame (100).

6. The centrifugal exhaust fan impeller according to claim 1, characterized in that: The spokes (200) have an air inlet side and an installation side on both sides of the axial direction, and the spokes (200) protrude from the air inlet side toward the installation side.

7. The centrifugal exhaust fan impeller according to claim 6, characterized in that: The spokes (200) have a gasket portion (240) on the surface of the air inlet side, and the shaft hole (210) communicates with the gasket portion (240).

8. The centrifugal exhaust fan impeller according to claim 1 or 7, characterized in that: The shaft hole (210) is a D-type hole.

9. The centrifugal exhaust fan impeller according to claim 1, characterized in that: The spokes (200) are provided with a plurality of air guide holes (220), and the spokes (230) are formed between two adjacent air guide holes (220).

10. An exhaust fan, characterized in that, include: Centrifugal exhaust fan impeller as described in any one of claims 1 to 9; The volute has an air guide chamber with an air inlet and an air outlet. The centrifugal exhaust fan impeller is installed in the air guide chamber and has an airflow direction from the air inlet to the air outlet. A grille that covers the air inlet.

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