Integrated two-piece assembled centrifugal fan blade structure

Abstract

The utility model provides an integrated two-piece assembled centrifugal fan blade structure which comprises an upper half part and a lower half part, the upper half part comprises a blade assembly and a wheel cover, and the lower half part is a wheel disc; with the central axis P of the wheel cover as the axis, the wheel cover, the blade assembly and the wheel disc coaxially correspond to each other; an air inlet is formed in the center of the wheel cover, the blade assembly comprises a plurality of arc-shaped blades, an air outlet channel is formed between every two adjacent blades, an air inlet is formed in one end of each air outlet channel, an air outlet is formed in the other end of each air outlet channel, and the air inlets are communicated with the air inlets; the wheel cover and the blade assembly are integrally formed and machined to form an upper half part, and the upper half part and the lower half part are connected with the wheel disc in a riveted mode through the blade assembly. The wheel cover and the blade assembly are integrally machined through the CNC engraving and milling technology, so that the connecting strength and the overall rigidity of the wheel cover and the blade assembly are effectively enhanced, the air suction force is improved, and the higher rotating speed can be achieved to meet the use requirements of consumers.

Description

Technical Field

[0001] The utility model belongs to the technical field of fans, and in particular relates to an integrated two-piece centrifugal fan blade structure. Background Art

[0002] A fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine, widely used in industrial fields, household appliances, etc. Its working principle is mainly to use the high-speed rotating impeller to accelerate and inhale the gas, then change the flow direction and discharge it, so that the kinetic energy is converted into potential energy or air pressure;

[0003] The strength and rigidity of the impeller as a core component are particularly important. Common impellers are generally composed of an air inlet cover, a lower cover and blades that are riveted together, or the lower cover and blades are formed as one piece and then riveted together with the air inlet cover. During high-speed operation of the impeller, air entering the impeller will cause lateral extrusion on the blades. When the extrusion pressure exceeds the bearing capacity of the blades, the impeller and the air inlet cover will easily fall apart, crack or explode. The maximum bearing speed of common impellers is 60,000 revolutions per minute. As people's living standards improve, the existing impeller speed can no longer meet people's needs. Therefore, a centrifugal impeller structure with higher strength is urgently needed. Utility Model Content

[0004] (1) Technical issues to be solved

[0005] The utility model provides an integrated two-piece centrifugal fan blade structure, aiming to solve the problem that a higher rotation speed cannot be achieved due to insufficient strength of the existing fan impeller and air inlet cover alone and insufficient connection strength between the impeller and the air inlet cover.

[0006] (2) Technical solution

[0007] The utility model provides an integrated two-piece centrifugal fan blade structure, comprising an upper half and a lower half, the upper half comprising a blade assembly and a wheel cover located above the blade assembly, and the lower half being a wheel disc; with the central axis P of the wheel cover as the axis, the wheel cover, the blade assembly and the wheel disc are coaxially corresponding; an air inlet is arranged at the center of the wheel cover, the blade assembly comprises a plurality of arc-shaped blades radially arranged in a circular array with the central axis P, an air outlet channel is formed between adjacent blades, an air inlet is arranged at one end of the air outlet channel, and an air outlet is arranged at the other end, and the air inlet is communicated with the air inlet; wherein the wheel cover and the blade assembly are integrally formed to form the upper half, and the upper half and the lower half are riveted to the wheel disc through the blade assembly.

[0008] Furthermore, the wheel cover and the blade assembly are manufactured by integrally forming using a CNC engraving and milling process, and the material thickness of the upper half is 0.6 to 1.2 mm, preferably 0.8 mm, and the material thickness of the lower half is 0.6 mm.

[0009] Furthermore, at least three riveted parts are provided at the bottom of the blade, and the riveted parts are in the shape of long strips, and the wheel disc is provided with a plurality of riveted holes corresponding to the riveted parts.

[0010] Furthermore, the blade includes an outer endpoint C away from the central axis P and an inner endpoint A close to the central axis P to form an arc AC, and an endpoint B is provided between the arc AC; wherein the installation angle of any section between the arc AB is the same and is Q1, and the installation angle of any section between the arc BC is the same and is Q2, then 1°<(Q1-Q2)<10°.

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

[0012] Furthermore, one end of the blade close to the central axis P is also provided with an air inlet inclined surface which has the function of guiding and diverting the airflow.

[0013] Furthermore, one 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] Furthermore, the wheel cover is provided with a flange which arches upward gradually from its peripheral wall toward the air inlet, and the flange is in a downward trumpet shape, so that an air cavity is formed inside 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] Furthermore, the blades are provided with 9 in number, and the peripheral wall of the wheel disc is also provided with a notch which is recessed inwards and used for assembly positioning.

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

[0018] The wheel cover and blade assembly are integrated through CNC engraving and milling technology, which effectively enhances the connection strength and overall rigidity of the wheel cover and blade assembly, thereby improving the air suction and achieving a higher rotation speed to meet the needs of consumers. At the same time, the two-piece assembly and riveting process of the upper and lower halves makes the assembly of the centrifugal fan blade structure simpler and more convenient, effectively improving production efficiency and saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The overall structure of the utility model is shown in FIG. Figure 1 .

[0020] Figure 2 The overall structure of the utility model is shown in FIG. Figure 2 .

[0021] Figure 3 It is an exploded view of the utility model.

[0022] Figure 4 This is a working principle diagram of the utility model.

[0023] Figure 5 This is a schematic diagram of the blade radian structure of the utility model.

[0024] Figure 6 It is an overall side sectional view of the utility model.

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

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] In order to more clearly express the purpose of the utility model and the technical solution of the embodiment, the utility model is placed on a horizontal plane, the direction perpendicular to the horizontal plane is the vertical direction, the upper side along the vertical direction is the upper side, and the lower side is the lower side.

[0028] At present, centrifugal fan impellers on the market are used in many fields, including hand dryers, vacuum cleaners, etc., and the impeller generally includes an upper cover, a lower cover and blades riveted between the two. At present, most impellers are made of aluminum alloy and have a thickness of 0.6mm. When the impeller speed reaches 60,000 revolutions per minute, the air squeezing force on the blade is greater than the bearing capacity of the blade riveting point and the heat generated by the high speed, the impeller is easy to fall apart, crack or explode, thereby affecting the use of consumers;

[0029] like Figure 1-6As shown, in order to better solve the above problems, the utility model provides an integrated two-piece centrifugal fan blade structure, comprising an upper half 1 and a lower half 2 located below the upper half 1, wherein the upper half 1 comprises a blade assembly 12 and a wheel cover 11 located above the blade assembly 12, and the lower half 2 is a wheel disc 21; wherein, with the central axis P of the wheel cover 11 as the axis, the wheel cover 11, the blade assembly 12 and the wheel disc 21 are coaxially corresponding;

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

[0031] When in use, under the high-speed rotation of the fan blade structure, the gas in the air outlet channel 122 is quickly compressed and forms a pressure difference with the external gas, and a large amount of air is sucked into the air inlet 111 and the air outlet channel 122 to generate suction. When the gas in the air outlet channel 122 reaches a certain degree of compression, it is discharged from the air outlet 1222 to generate an air flow. Therefore, the kinetic energy of the fan blade structure is converted into air pressure, thereby achieving the effect of sucking and blowing air.

[0032] It should be noted that, for better expression, the outer side in this article refers to the end or side away from the central axis P of the utility model, and the inner side refers to the end or side close to the central axis P of the utility model.

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

[0034] Furthermore, in order to better strengthen the connection strength between the wheel cover 11 and the blade assembly 12, the wheel cover 11 and the blade assembly 12 are both made of aluminum alloy, and the thickness is set to 0.6 to 1.2 mm. Compared with the traditional thickness of 0.6 mm, the thicker thickness can effectively enhance the overall rigidity of the upper part 1, thereby further improving the maximum operating speed. Although aluminum alloy is lighter in weight and the thicker the thickness, the stronger it is, but considering the material cost, after comparing the test data, a thickness of 0.8 mm is more appropriate, which not only ensures strength but also controls cost.

[0035] Specifically, the upper half 1 and the lower half 2 are riveted together by the blade assembly 11 and the wheel disc 21. In order to improve the convenience of processing and production and reduce the production cost, the fan blade structure is connected by riveting 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 less air squeezing force. Therefore, the blade assembly 12 and the wheel disc 21 adopt a riveting structure, which can effectively reduce the production cost while ensuring a certain connection strength.

[0036] Furthermore, if Figure 3As shown, at least three riveted portions 1211 are provided at the bottom of each blade 121 in the blade assembly 12, and the riveted portions 1211 are in the shape of long strips. The wheel disc 21 is provided with a plurality of riveted holes 212 corresponding to the riveted portions 1211. During installation, the riveted portions 1211 at the bottom of the blade 121 are inserted into the riveted holes 212 in the wheel disc 21, and at least a portion of the riveted portions 1211 passes through the riveted holes 212 and extends toward the bottom of the wheel disc 21. Then, mechanical extrusion is used to make the portion of the riveted portion 1211 extending toward the bottom of the wheel disc 21 through the riveted holes 212 is extruded and deformed and fits against the bottom of the wheel disc 21, thereby realizing the riveting fixation of the blade 121 and the wheel disc 21. The riveted connection can effectively reduce the processing cost, and the structure is simple, which effectively improves the convenience of installation.

[0037] Specifically, Figure 4-5 As shown, the blade 121 includes an outer endpoint C away from the central axis P and an inner endpoint A close to the central axis P, the outer endpoint C and the inner endpoint A form an arc line AC with the same curvature as the blade 121, wherein an endpoint B is provided between the arc lines AC;

[0038] The installation angle of any section between arcs AB is the same and is Q1, and the installation angle of any section between arcs BC is the same and is Q2, and at the same time, the installation angle Q1 is greater than the installation angle Q2; in actual use, after the air enters the air outlet channel 122, the extrusion force of the air on the blade 121 is concentrated between the arcs AB. When the air is compressed to a certain extent, the air will move to between the arcs BC. Since the installation angle Q1 is greater than the installation angle Q2, that is, the arc BC is relatively gentle relative to the arc AB, it is more conducive to the discharge of air. By setting the installation angle Q1 greater than the installation angle Q2, the rotation speed is effectively increased and the mechanical life is extended while ensuring that the fan blade structure has good suction;

[0039] Preferably, since the curvature of the blade 121 is the key to the suction strength of the fan and the adjustment of the rotation speed, that is to say, the length and curvature of the arc AB and the arc BC need to be reasonably adjusted. If the curvature is too small, the suction efficiency will be reduced, and if the curvature is too large, the wind pressure and wind resistance will be too large, affecting the rotation speed. In order to better balance the problem of suction efficiency and rotation speed, the difference between the installation angle Q1 and the installation angle Q2 is between 1° and 10°, that is, 1°<(Q1-Q2)<10°; at the same time, the length ratio of the arc AB to the arc BC is between 0.5 and 1.

[0040] Specifically, Figure 1As shown in FIG. 4 , an end of the blade 121 close to the central axis P is further provided with an inlet slope 1212, so that an inlet angle is formed at the inner end point A of the blade 121. The inlet slope 1212 has a guiding and diverting effect on the gas sucked into the air inlet 111, thereby facilitating the reduction of the noise generated by the blade 121 during operation.

[0041] Furthermore, one end of the blade 121 away from the central 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 smoother, and at the same time, it can effectively reduce the wind resistance of the peripheral wall during high-speed rotation, thereby increasing the rotation speed.

[0042] Specifically, Figure 1 As shown in FIG. 6 , the wheel cover 11 is provided with a flange 112 which gradually rises upward from its peripheral wall toward the air inlet 111 , and the flange 112 is in a downward trumpet shape, so that an air cavity 113 is formed inside the wheel cover 11 , so that the fan blade structure can inhale more gas when rotating at a high speed, and at the same time, the air inhalation is smoother;

[0043] Furthermore, the vertical height of the blade 121 gradually increases from the outside to the inside along the flange 112, thereby increasing the contact area between the blade 121 and the gas. When rotating, the blade 121 can squeeze more gas, thereby increasing the gas pressure in the air outlet channel 122, and further increasing the air suction at the air inlet 111;

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

[0045] Specifically, in order to increase the contact area between the blades 121 and the air, the blade assembly 12 includes a total of 9 blades 121, and the 9 blades 121 are evenly and symmetrically distributed around the center to form 9 air outlet channels 122. Good test data are obtained in terms of high-speed rotation mass balance, air channel density, and wind pressure intensity. When the 9 blades 121 rotate simultaneously, the gas in the air outlet channel 122 can be quickly compressed to generate an air pressure difference, thereby enabling the gas to reach a good working state in a shorter time and improve work efficiency.

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

[0047] The following is a detailed description of the working principle of the utility model;

[0048] During installation, the upper part 1 is placed above the lower part 2 with the blade assembly 12 facing downward, and then the riveted part 1211 at the bottom of the blade 121 is connected to the riveted hole 212 in the wheel disc 21, and finally the riveted part 1211 is connected to the wheel disc 21 by riveting and pressing 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 in use, the fan blade structure rotates at high speed, and the gas in the air outlet channel 122 squeezes and compresses the blade 121. At this time, the gas in the air outlet channel 122 forms a pressure difference with the external gas, thereby generating air suction at the air inlet 111. When the air pressure in the air outlet channel 122 reaches a certain value, it will be discharged toward the air outlet 1222, and then the next round of intake and exhaust will be carried out.

[0050] The innovation of the utility model lies in the integrated processing of the wheel cover and the blade assembly through CNC engraving and milling technology, thereby effectively enhancing the connection strength and overall rigidity of the wheel cover and the blade assembly, thereby improving the air suction and being able to achieve a higher rotation speed to meet the consumer's usage needs. At the same time, through the two-piece assembly and riveting process of the upper and lower halves, the assembly of the centrifugal fan blade structure is simpler and more convenient, effectively improving production efficiency and saving production costs.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

[0052] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An integrated two-piece centrifugal fan blade structure, characterized in that: The invention comprises an upper part (1) and a lower part (2), wherein the upper part (1) comprises a blade assembly (12) and a wheel cover (11) located above the blade assembly (12), and the lower part (2) is a wheel disc (21); with the central axis P of the wheel cover (11) as the axis, the wheel cover (11), the blade assembly (12) and the wheel disc (21) are coaxially corresponding to each other; an air inlet (111) is provided at the center of the wheel cover (11); the blade assembly (12) comprises a plurality of arc-shaped blades (121) radially arranged in a circular array around the central axis P, and an air outlet channel (122) is formed between adjacent blades (121); an air inlet (1221) is provided at one end of the air outlet channel (122), and an air outlet (1222) is provided at the other end; the air inlet (1221) is communicated with the air inlet (111); The wheel cover (11) and the blade assembly (12) are integrally formed to form the upper half (1), and the upper half (1) and the lower half (2) are riveted to the wheel disc (21) via the blade assembly (12).

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

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

4. According to claim 1, the one-piece two-piece centrifugal fan blade structure is characterized in that: The blade (121) comprises an outer end point C away from the central axis P and an inner end point A close to the central axis P and forms an arc line AC, and an end point B is provided between the arc lines AC; Among them, the installation angle of any section between arcs AB is the same and is Q1, and the installation angle of any section between arcs BC is the same and is Q2, then 1°<(Q1-Q2)<10°.

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

6. The one-piece two-piece centrifugal fan blade structure according to claim 1, characterized in that: The blade (121) is also provided with an inlet inclined surface (1212) at one end close to the central axis P, which has the function of guiding and diverting the airflow.

7. The one-piece two-piece centrifugal fan blade structure according to claim 6, characterized in that: One end of the blade (121) away from the central 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 one-piece two-piece centrifugal fan blade structure according to claim 1, characterized in that: The wheel cover (11) is provided with a flange (112) which gradually rises upward from its peripheral wall toward the air inlet (111), and the flange (112) is in a downward trumpet shape, so that an air cavity (113) is formed inside the wheel cover (11).

9. The one-piece two-piece centrifugal fan blade structure according to claim 8, characterized in that: The vertical height of the end of the blade (121) away from the central axis P is D1, and the vertical height of the end close to the central axis P is D2, and D2 is greater than D1.

10. The one-piece two-piece centrifugal fan blade structure according to claim 3, characterized in that: The blades (121) are provided in nine numbers, and the peripheral wall of the wheel disc (21) is also provided with an inwardly recessed notch (213).

11. The one-piece two-piece centrifugal fan blade structure according to claim 10, characterized in that: At least three riveted portions (1211) are provided at the bottom of the blade (121), the riveted portions (1211) are in the shape of long strips, and the wheel disc (21) is provided with a plurality of riveted holes (212) corresponding to the riveted portions (1211).

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