Integrated two-piece assembled centrifugal fan blade structure

Abstract

An integrated two-piece assembled centrifugal fan blade structure, comprising an upper-half portion (1) and a lower-half portion (2), wherein the upper-half portion (1) comprises a blade assembly (12) and an impeller cover (11), and the lower-half portion (2) is an impeller disk (21); using a central axis P of the impeller cover (11) as an axis, the impeller cover (11), the blade assembly (12), and the impeller disk (21) coaxially correspond to one another; an air inlet (111) is provided at the center of the impeller cover (11), and the blade assembly (12) comprises a plurality of curved blades (121), wherein an air outflow channel (122) is formed between adjacent blades (121), one end of the air outlet channel (122) is provided with an air intake (1221), the other end is provided with an air outlet (1222), and the air intake (1221) is in communication with the air inlet (111); and the impeller cover (11) and the blade assembly (12) are integrally formed to create the upper-half portion (1), and the upper-half portion (1) and the lower-half portion (2) are rivet-connected to the impeller disk (21) by means of the blade assembly (12).

Description

Integrated two-piece assembled centrifugal fan blade structure TECHNICAL FIELD

[0001] The utility model belongs to fan technical field, concretely relates to integrated two-piece assembled centrifugal fan blade structure. BACKGROUND

[0002] Fan is a kind of machinery that relies on the input mechanical energy to improve gas pressure and discharge gas. It is a driven fluid machine, widely used in industrial field, household appliance field etc.;Its working principle is mainly to use high-speed rotating impeller to accelerate and suck gas, then change flow direction and discharge, so that kinetic energy is converted into potential energy or gas pressure;

[0003] The strength and rigidity of the impeller as the core component are particularly important. Common impellers are generally composed of an air inlet upper cover, a lower cover and blades by riveting, or the lower cover and blades are integrally formed and then riveted and fixed with the air inlet upper cover. During high-speed operation of the impeller, air entering the impeller will cause lateral extrusion to the blades. When the extrusion force exceeds the bearing capacity of the blades, the impeller and the air inlet upper cover are easy to be scattered, brittle or burst. The maximum bearing speed of the common impeller is 60000 revolutions per minute. With the improvement of people's living standards, the existing impeller speed cannot meet people's needs, so there is an urgent need for a centrifugal impeller structure with higher strength. CONTENT OF THE UTILITY MODEL

[0004] (1) Technical problem to be solved

[0005] The utility model provides a kind of integrated two-piece assembled centrifugal fan blade structure, to solve the problem that the strength of the single fan impeller and air inlet upper cover is not enough, and the connection strength of the impeller and air inlet upper cover is also not enough, so higher speed cannot be reached.

[0006] (2) Technical scheme

[0007] The utility model provides a kind of integrated two-piece assembled centrifugal fan blade structure, including upper half and lower half, the upper half includes blade assembly and the wheel cover located above the blade assembly, the lower half is wheel disc;With the center axis P of the wheel cover as the axis, the wheel cover, the blade assembly and the wheel disc three coaxial correspondences;The center of the wheel cover is provided with air inlet, the blade assembly includes the arc blade of the center axis P annular array radial arrangement, adjacent the blade forms air outlet passage, the air outlet passage one end is equipped with air inlet, other end is equipped with air outlet, the air inlet is communicated with the air inlet;Wherein, the wheel cover and the blade assembly are integrally formed and processed to form the upper half, and the upper half and the lower half are riveted and connected by the blade assembly and the wheel disc.

[0008] Further, the wheel cover and the blade assembly are integrally formed by a CNC engraving and milling process, and the material thickness of the upper half is 0.6-1.2 mm, preferably 0.8 mm, and the material thickness of the lower half is 0.6 mm.

[0009] Further, the blade bottom is provided with at least three riveting portions in a strip shape, and the wheel disc is provided with a plurality of riveting holes corresponding to the riveting portions.

[0010] Further, the blade includes an outer end point C away from the central axis P and an inner end point A close to the central axis P and forming an arc line AC, and end points B are arranged between the arc lines AC; wherein the installation angle of any segment between the arc lines AB is the same and is Q1, the installation angle of any segment between the arc lines BC is the same and is Q2, and 1°<(Q1-Q2)<10°.

[0011] Further, the length ratio of the arc lines AB to the arc lines BC is between 0.5 and 1.

[0012] Further, the blade is further provided with an air inlet inclined surface close to the central axis P, which has a flow guiding and dividing effect on air flow.

[0013] Further, the end of the blade away from the central axis P is vertically flush with the peripheral wall of the wheel cover and the peripheral wall of the wheel disc.

[0014] Further, the wheel cover is provided with a flange gradually arched upward from the peripheral wall thereof toward the air inlet direction, and the flange is trumpet-shaped downward, so that an air cavity is formed in the wheel cover.

[0015] Further, the vertical height of the end of the blade away from the central axis P is D1, and the vertical height of the end of the blade close to the central axis P is D2, and D2 is greater than D1.

[0016] Further, the blade is provided with nine, and the peripheral wall of the wheel disc is further provided with a notch recessed inward and used for assembly positioning.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] The wheel cover and the blade assembly are integrally processed by a CNC engraving and milling process, so as to effectively enhance the connection strength and overall rigidity of the wheel cover and the blade assembly, thereby improving the air suction force and achieving higher speed to meet the use requirements of consumers, and the two-piece riveting assembly process of the upper half and the lower half makes the assembly of the centrifugal fan blade structure simpler and more convenient, effectively improves the production efficiency and saves the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic diagram of the overall structure of the present application.

[0020] Figure 2 is a schematic diagram of the overall structure of the present application.

[0021] Figure 3 is an exploded view of the present application.

[0022] Figure 4 is a working principle diagram of the present application.

[0023] Figure 5 is a schematic diagram of the blade curvature structure of the present application.

[0024] Figure 6 is a schematic diagram of the overall side view of the present application.

[0025] Reference signs: 1 - upper half, 11 - wheel cover, 111 - air inlet, 112 - flange, 113 - air cavity, 12 - blade assembly, 121 - blade, 1211 - riveting part, 1212 - air inlet slope, 122 - air outlet channel, 1221 - air inlet, 1222 - air outlet, 2 - lower half, 21 - wheel disc, 211 - connecting hole, 212 - riveting hole, 213 - notch. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0027] In order to more clearly express the purpose and technical solutions of the embodiments of the present application, the present application is placed on a horizontal plane, the vertical direction perpendicular to the horizontal plane is the vertical direction, the upper direction along the vertical direction is the upper direction, and the lower direction is the lower direction.

[0028] At present, the centrifugal fan impeller is applied to many fields on the market, including hand dryers, dust collectors and the like, and the impeller generally comprises an upper cover, a lower cover and blades riveted between the two, and most of the current impellers are made of aluminum alloy material and have a thickness of 0.6 mm. When the rotational speed of the impeller reaches 60,000 revolutions per minute, under the influence of the air extrusion force on the blades being greater than the bearing capacity of the riveting points of the blades and the heat generated by high speed, the impeller is prone to collapse, brittle fracture or explosion, thereby affecting the use of consumers.

[0029] As shown in Figures 1-6, in order to better solve the above problems, the present application provides an integrated two-piece assembled centrifugal fan blade structure, comprising an upper half 1 and a lower half 2 located below the upper half 1, the upper half 1 comprising a blade assembly 12 and a wheel cover 11 located above the blade assembly 12, and the lower half 2 being a wheel disc 21; wherein the center axis P of the wheel cover 11 is taken as the axis, the wheel cover 11, the blade assembly 12 and the wheel disc 21 are coaxial corresponding to each other.

[0030] The wheel cover 11 and the wheel disc 21 are annular structures, the wheel cover 11 is provided with an air inlet 111 at the center position, the wheel disc 21 is provided with a connecting hole 211 at the center position, the connecting hole 211 is arranged for fixing the blade structure and the motor rotor assembly, the blade assembly 12 comprises a plurality of arc-shaped blades 121 arranged radially in an annular array around the center shaft P, an air outlet passage 122 is formed between adjacent blades 121, the air outlet passage 122 is provided with an air inlet 1221 at one end close to the center shaft P, the air inlet 1221 is communicated with the air inlet 111, the air outlet passage 122 is provided with an air outlet 1222 at one end away from the center shaft P, and the air outlet 1222 is used for discharging air flow;

[0031] In use, under the high-speed rotation of the blade structure, the gas in the air outlet passage 122 is quickly compressed, and a pressure difference is formed with the external gas, a large amount of air is sucked into the air inlet 111 and the air outlet passage 122 to generate suction, and when the gas in the air outlet passage 122 reaches a certain compression degree, it is discharged from the air outlet 1222 to generate an air outlet flow, so that the kinetic energy of the blade structure is converted into air pressure, and the effect of air suction and blowing is achieved.

[0032] It should be noted that, in order to better express, the outer in this paper refers to the end or side away from the center shaft P in the utility model, and the inner refers to the end or side close to the center shaft P in the utility model.

[0033] Specifically, during the high-speed rotation of the blade structure, air enters from the air inlet 111 and preferentially extrudes the wheel cover 11, the blade assembly 12 and the connection between the two, so that the connection between the wheel cover 11 and the blade assembly 12 is subjected to greater and more concentrated extrusion force of air relative to the connection between the blade assembly 12 and the wheel disc 21, therefore, in order to improve the overall strength of the blade structure, the wheel cover 11 and the blade assembly 12 are integrally formed by CNC engraving and milling process, which can effectively improve the strength and wind pressure resistance of the upper half 1 relative to the riveting structure of the traditional upper cover and blade, so that it can work stably at a speed of 65,000 revolutions per minute, greatly exceeding the maximum speed of the traditional fan impeller;

[0034] Further, in order to better enhance the connection strength of the wheel cover 11 and the blade assembly 12, the wheel cover 11 and the blade assembly 12 are both made of aluminum alloy material, and the thickness is set to 0.6-1.2mm. Compared with the traditional thickness of 0.6mm, the thicker thickness can effectively enhance the overall rigidity of the upper half 1, thereby further improving the maximum working speed. Although aluminum alloy is lighter in quality, the thicker the thickness, the stronger the strength, but considering the comprehensive material cost, the thickness of 0.8mm is more appropriate, which can ensure the strength and control the cost.

[0035] Specifically, the upper half 1 and the lower half 2 are riveted and connected through the blade assembly 11 and the wheel disc 21. In order to improve the convenience of processing and production and reduce production cost, the blade structure is connected in the way of riveting and assembling the upper half 1 and the lower half 2. Compared with the connection between the wheel cover 11 and the blade assembly 12, the connection between the blade assembly 12 and the wheel disc 21 is subjected to smaller air extrusion force. Therefore, the blade assembly 12 and the wheel disc 21 adopt riveting structure to effectively reduce production cost while ensuring certain connection strength.

[0036] Further, as shown in FIG. 3, the bottom of each blade 121 in the blade assembly 12 is provided with at least three riveting parts 1211, the riveting parts 1211 are long strips, and the wheel disc 21 is provided with a plurality of riveting holes 212 corresponding to the riveting parts 1211. During installation, the riveting parts 1211 at the bottom of the blade 121 are inserted into the riveting holes 212 in the wheel disc 21, at least a part of the riveting parts 1211 extends towards the bottom of the wheel disc 21 through the riveting holes 212, and then the part of the riveting parts 1211 extending towards the bottom of the wheel disc 21 through the riveting holes 212 is extruded and deformed and adheres to the bottom of the wheel disc 21 through mechanical extrusion, thereby realizing the riveting and fixing of the blade 121 and the wheel disc 21. Through the riveting connection, the processing cost can be effectively reduced, the structure is simple, and the installation convenience is effectively improved.

[0037] Specifically, as shown in FIGS. 4-5, the blade 121 includes an outer endpoint C away from the center axis P and an inner endpoint A close to the center axis P, the outer endpoint C and the inner endpoint A form an arc line AC with the same bending degree as the blade 121, and an endpoint B is arranged between the arc lines AC.

[0038] The installation angle of any section between the arc AB is the same and Q1, the installation angle of any section between the arc BC is the same and Q2, and the installation angle Q1 is greater than the installation angle Q2; in actual use, after air enters the air outlet channel 122, the extrusion force of air on the blade 121 is concentrated between the arc AB, when the air is compressed to a certain degree, the air moves to the arc BC, because the installation angle Q1 is greater than the installation angle Q2, that is, the arc BC is relatively flat relative to the arc AB, so it is more conducive to air exhaust, through the installation angle Q1 greater than the installation angle Q2, the wind blade structure has good suction while effectively improving the rotating speed and prolonging the mechanical life;

[0039] Preferably, because the curvature of the blade 121 is the key to the strength of the fan suction and the adjustment of the rotating speed, that is, the length and curvature of the arc AB and the arc BC need to be reasonably adjusted, too small curvature reduces the air suction efficiency, too large curvature increases the wind pressure and wind resistance, which affects the rotating speed, in order to better balance the air suction efficiency and the rotating speed, the difference between the installation angle Q1 and the installation angle Q2 is between 1° and 10°, that is, 1° < (Q1-Q2) < 10°; and the length ratio of the arc AB to the arc BC is between 0.5 and 1.

[0040] Specifically, as shown in FIG. 1 or 4, one end of the blade 121 close to the center axis P is further provided with an air inlet inclined surface 1212, so that the inner end point A of the blade 121 forms an air inlet sharp angle, the arrangement of the air inlet inclined surface 1212 has the effect of guiding and dividing the gas sucked into the air inlet 111, thereby facilitating the reduction of noise generated by the blade 121 during operation;

[0041] Further, the end of the blade 121 away from the center axis P is vertically flush with the peripheral wall of the wheel cover 11 and the peripheral wall of the wheel disc 21, so that the overall peripheral wall of the fan blade structure is more flat, and the peripheral wall wind resistance during high-speed rotation is effectively reduced, thereby improving the rotating speed.

[0042] Specifically, as shown in FIG. 1 or 6, the wheel cover 11 is provided with a flange 112 which gradually arches upward from the peripheral wall of the wheel cover 11 to the air inlet 111, the flange 112 is trumpet-shaped downward, so that the wheel cover 11 forms an air cavity 113 inside, so that the fan blade structure can suck more gas during high-speed rotation, and the gas suction is smoother;

[0043] Further, the vertical height of the blade 121 gradually increases from outside to inside along the flange 112, thereby increasing the contact area of the blade 121 with the gas, so that the blade 121 can extrude more gas during rotation, thereby increasing the gas pressure in the air outlet channel 122, and further increasing the air suction force at the air inlet 111;

[0044] Further, the vertical height of the outer end point C of the blade 121 is D1, and the vertical height of the inner end point A is D2, and D2 is greater than D1.

[0045] Specifically, in order to improve the contact area of the blade 121 with air, the blade assembly 12 comprises 9 blades 121, which are uniformly distributed in the center and symmetrically, forming 9 air outlet channels 122, which have better test data in high-speed rotation mass balance, air duct density and air pressure intensity, and the gas in the air outlet channel 122 can be quickly compressed to generate air pressure difference under the simultaneous rotation of the 9 blades 121, so as to reach a good working state in a shorter time and improve the working efficiency.

[0046] Specifically, as shown in Figure 1, the peripheral wall of the wheel disc 21 is also provided with an inwardly recessed notch 213, which can be semicircular, square or triangular, etc. The notch 213 is mainly used for assembly positioning of the wheel disc 21, and overall installation and positioning of the fan blade structure.

[0047] The working principle of the utility model is described in detail as follows:

[0048] When installing, the upper half 1 is placed above the lower half 2 with the blade assembly 12 downward, then the riveting part 1211 at the bottom of the blade 121 is butted with the riveting hole 212 in the wheel disc 21, and finally the riveting part 1211 is riveted and connected with the wheel disc 21 to complete the installation; the assembly is simple, time-saving and labor-saving, and the production cost is low, which can effectively improve the production efficiency;

[0049] When using, the gas in the air outlet channel 122 is extruded and compressed by the blade 121 in the high-speed rotating state, at this time the gas in the air outlet channel 122 and the external gas form a pressure difference, so that the air suction force is generated at the air inlet 111, when the air pressure in the air outlet channel 122 reaches a certain value, it will be discharged to the air outlet 1222, and then the next round of air suction and exhaust is carried out.

[0050] The innovation of the utility model lies in that the wheel cover and the blade assembly are integrally processed by CNC engraving and milling process, so as to effectively enhance the connection strength and overall rigidity of the wheel cover and the blade assembly, and then improve the air suction force and reach a higher speed to meet the use demand of consumers, and at the same time, through the two-piece riveting process of the upper half and the lower half, the centrifugal fan fan blade structure assembly is more simple and convenient, which effectively improves the production efficiency and saves the production cost.

[0051] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0052] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. A centrifugal fan blade structure of one-piece two-piece assembly, characterized in that, The fan includes an upper half (1) and a lower half (2), the upper half (1) includes a vane assembly (12) and a wheel cover (11) above the vane assembly (12), and the lower half (2) is a wheel disc (21); the wheel cover (11), the vane assembly (12) and the wheel disc (21) are coaxial corresponding with the center axis P of the wheel cover (11) as the axis; the center of the wheel cover (11) is provided with an air inlet (111), the vane assembly (12) includes a plurality of arc vanes (121) arranged radially in an annular array around the center axis P, an air outlet channel (122) is formed between adjacent vanes (121), one end of the air outlet channel (122) is provided with an air inlet (1221), and the other end is provided with an air outlet (1222); the air inlet (1221) is in communication with the air inlet (111). The wheel cover (11) and the vane assembly (12) are integrally formed to form the upper half (1), and the upper half (1) and the lower half (2) are riveted and connected through the vane assembly (12) and the wheel disc (21).

2. The integrated two-piece assembled centrifugal fan blade structure according to claim 1, characterized in that, The wheel cover (11) and the vane assembly (12) are integrally formed by a CNC engraving and milling process, and the material thickness of the upper half (1) is 0.6-1.2 mm.

3. The integrated two-piece assembled centrifugal fan blade structure according to claim 2, characterized in that, The material thickness of the upper half (1) is 0.8 mm.

4. The integrated two-piece assembled centrifugal fan blade structure according to claim 1, wherein The vane (121) includes an outer end point C away from the center axis P and an inner end point A close to the center axis P and forming an arc line AC, and an end point B is arranged between the arc lines AC. The installation angle of any section between the arc lines AB is the same and is Q1, the installation angle of any section between the arc lines BC is the same and is Q2, and 1°<(Q1-Q2)<10°.

5. The integrated two-piece assembled centrifugal fan blade structure according to claim 4, characterized in that, The length ratio of the arc line AB to the arc line BC is between 0.5 and 1.

6. The integrated two-piece assembled centrifugal fan blade structure according to claim 1, wherein The vane (121) is further provided with an air inlet inclined surface (1212) close to the center axis P, which has a flow guiding and dividing effect on airflow.

7. The integrated two-piece assembled centrifugal fan blade structure according to claim 6, characterized in that, The end of the vane (121) away from the center axis P is vertically flush with the peripheral wall of the wheel cover (11) and the peripheral wall of the wheel disc (21).

8. The integrated two-piece assembled centrifugal fan blade structure according to claim 1, wherein The wheel cover (11) is provided with a flange (112) which is gradually arched upward from the peripheral wall of the wheel cover (11) to the air inlet (111), and the flange (112) is trumpet-shaped downward, so that an air cavity (113) is formed in the wheel cover (11).

9. The integrated two-piece assembled centrifugal fan blade structure according to claim 8, wherein The vertical height of the end of the vane (121) away from the center axis P is D1, and the vertical height of the end of the vane (121) close to the center axis P is D2, and D2 is greater than D1.

10. The integrated two-piece assembled centrifugal fan blade structure according to claim 3, wherein The vane (121) is provided with nine vanes, and the peripheral wall of the wheel disc (21) is further provided with a recess (213).

11. The integrated two-piece assembled centrifugal fan blade structure according to claim 10, wherein The bottom of the vane (121) is provided with at least three riveting portions (1211), the riveting portions (1211) are long strips, and the wheel disc (21) is provided with a plurality of riveting holes (212) corresponding to the riveting portions (1211).

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