Centrifugal fan impeller structure

Abstract

The utility model discloses an impeller structure of a centrifugal fan. The impeller structure of the centrifugal fan comprises a wheel disc and a plurality of arc-shaped fan blades arranged on the front face of the wheel disc in the circumferential direction. The front edge of the wheel disc is provided with an annular step opening, and the front center of the wheel disc is provided with a center protruding column. A plurality of arc-shaped T-shaped inserting grooves are formed in the front face of the wheel disc in the circumferential direction, one ends of the T-shaped inserting grooves extend into the side face of the center protruding column, and the other ends of the T-shaped inserting grooves extend to the annular step opening. Arc-shaped inserting plates are fixedly connected to the lower ends of the arc-shaped fan blades, the arc-shaped inserting plates are arranged to be transverse groove parts capable of being inserted into the T-shaped inserting grooves in a matched mode, and the arc-shaped fan blades are arranged to be longitudinal groove parts capable of being inserted into the T-shaped inserting grooves; a limiting ring is installed on the annular step opening through a screw, and a plurality of extending fan blades which are in one-to-one correspondence with the arc-shaped fan blades and are in contact connection with the arc-shaped fan blades are arranged on the limiting ring. The fan blades in the impeller structure of the centrifugal fan are of a detachable structure, maintenance and cleaning are convenient, and the fan blades further have the advantage of being easy to assemble.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal fans, specifically to a centrifugal fan impeller structure. Background Technology

[0002] Centrifugal fans operate on the principle of converting kinetic energy into potential energy. During operation, the electric motor drives the blades to rotate, and air flows radially under the propulsion of the blades. Accelerated by the blades, the air pressure increases and is eventually discharged through the fan outlet, forming the desired airflow.

[0003] Publication number CN204628064U discloses a combined centrifugal fan impeller, which includes an upper cover plate, multiple blades, a lower cover plate and a shaft sleeve. Multiple protrusions are distributed on the upper and lower sides of the blades. The impeller blades use a design concept that combines traditional centrifugal impellers with axial and mixed flow fan impellers, which improves the efficiency of the impeller.

[0004] This combined centrifugal fan impeller is detachable by directly screwing on a connecting plate with threaded holes to fix its position. However, its axial force-bearing surface is limited to the connecting plate, resulting in a small force-bearing area. Radial forces are directly transmitted to the bolts, leading to poor stability. Utility Model Content

[0005] The purpose of this utility model is to provide a centrifugal fan impeller structure in which the fan blades are detachable, making maintenance and cleaning convenient, and the fan blades also have the advantage of simple assembly.

[0006] To achieve the above objectives, this utility model provides a centrifugal fan impeller structure, which includes a disc and multiple arc-shaped fan blades circumferentially arranged on the front side of the disc; an annular stepped opening is provided at the edge of the front side of the disc, and a central protrusion is provided at the center of the front side of the disc; multiple arc-shaped T-slots are provided circumferentially on the front side of the disc, one end of the T-slot extending into the side of the central protrusion, and the other end extending to the annular stepped opening; an arc-shaped insert plate is fixedly connected to the lower end of each arc-shaped fan blade, the arc-shaped insert plate being configured to fit into the horizontal groove portion of the T-slot, and the arc-shaped fan blade being configured to fit into the vertical groove portion of the T-slot; a limiting ring is installed on the annular stepped opening by screws, and the limiting ring is provided with multiple extended fan blades that correspond one-to-one with and are in contact with the arc-shaped fan blades.

[0007] Preferably, the limiting ring is provided with a plurality of countersunk holes, and the step surface of the annular step opening is provided with a plurality of screw holes corresponding one-to-one with the countersunk holes, and the screws screwed into the screw holes are installed in the countersunk holes.

[0008] Preferably, the screw is an internal polygonal countersunk screw.

[0009] Preferably, the outer end of the arc-shaped fan blade is provided with a vertical slot; the vertical slot extends downward and penetrates the arc-shaped insert plate, and the inner end of the extended fan blade is provided with a vertical insert plate that fits and inserts into the vertical slot.

[0010] Preferably, the outer end of the central protrusion is spherical.

[0011] Preferably, the arc-shaped fan blade and the extended fan blade have the same arc and are concentrically arranged.

[0012] Preferably, a connecting sleeve is provided at the center of the back of the wheel; the inner wall of the connecting sleeve is provided with multiple keyways along the circumference.

[0013] Preferably, the upper surface of the arc-shaped fan blade is set as a sloping straight surface near the inner end; the upper surface of the arc-shaped fan blade is set as a flat straight surface near the outer end, and the flat straight surface is parallel to the surface of the wheel; the distance between the sloping straight surface and the surface of the wheel gradually increases along the bending direction of the arc-shaped fan blade.

[0014] According to the above technical solution, this utility model provides a centrifugal fan impeller structure, which includes a disc and multiple arc-shaped fan blades circumferentially arranged on the front side of the disc; an annular stepped opening is provided at the edge of the front side of the disc, and a central protrusion is provided at the center of the front side of the disc; multiple arc-shaped T-slots are provided circumferentially on the front side of the disc, one end of the T-slot extends into the side of the central protrusion, and the other end extends to the annular stepped opening; an arc-shaped insert plate is fixedly connected to the lower end of the arc-shaped fan blade, the arc-shaped insert plate is configured to fit into the horizontal groove portion of the T-slot, and the arc-shaped fan blade is configured to fit into the vertical groove portion of the T-slot; a limiting ring is installed on the annular stepped opening by screws, and multiple extended fan blades corresponding to and in contact with the arc-shaped fan blades are provided on the limiting ring.

[0015] The assembly method and beneficial effects of this centrifugal fan impeller structure are as follows: During assembly, the integral structure connecting multiple arc-shaped fan blades and arc-shaped insert plates is first inserted one by one into the corresponding T-slots, so that the inner end of the integral structure is deeply inserted into the groove on the side of the central convex column, and the outer end is flush with the vertical surface of the annular step opening. Then, a limiting ring is fitted in, so that the inner wall of the limiting ring contacts the vertical surface of the annular step opening, restricting the outward movement of the integral structure. Finally, the limiting ring is fixed to the impeller with multiple screws. Due to this structure, the arc-shaped fan blades can be assembled into a detachable structure, which is convenient for disassembly and maintenance and cleaning. At the same time, the outward movement of the arc-shaped fan blades can be restricted simply by installing the limiting ring, so that they will not move outward due to centrifugal force during rotation. Therefore, it has the advantage of simple assembly while maintaining the normal operation of the fan blades. In addition, by setting extended fan blades, the insufficient length of the arc-shaped fan blades can be compensated for, making the wind force generated by this centrifugal fan impeller structure more stable.

[0016] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a front view of the overall structure of a preferred embodiment of a centrifugal fan impeller structure;

[0019] Figure 2 This is a schematic diagram of the overall structure of a preferred embodiment of a centrifugal fan impeller;

[0020] Figure 3 This is a schematic diagram of the overall structure of a preferred embodiment of the roulette wheel;

[0021] Figure 4 This is a schematic diagram of the overall structure of a preferred embodiment of the limiting ring;

[0022] Figure 5 This is a schematic diagram of the overall structure connecting the arc-shaped fan blades and the arc-shaped insert plate.

[0023] Explanation of reference numerals in the attached figures

[0024] 1-Disc; 2-Spherical surface; 3-Limiting ring; 4-Arc-shaped fan blade; 5-Extended fan blade; 6-Inner polygonal countersunk screw; 7-Connecting sleeve; 8-Keyway; 9-Central protrusion; 10-Annular stepped opening; 11-T-slot; 12-Screw hole; 13-Vertical insert plate; 14-Countersunk hole; 15-Arc-shaped insert plate; 16-Vertical slot; 17-Beveled straight surface; 18-Flat straight surface. Detailed Implementation

[0025] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0026] In this utility model, unless otherwise stated, directional terms such as "up, down, left, right, front, back, inside, outside" in the terminology only represent the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as a limitation on the term.

[0027] See Figure 1-5 The centrifugal fan impeller structure shown includes a disc 1 and multiple arc-shaped fan blades 4 circumferentially arranged on the front side of the disc 1; an annular stepped opening 10 is provided at the edge of the front side of the disc 1, and a central protrusion 9 is provided at the center of the front side of the disc 1; multiple arc-shaped T-slots 11 are provided circumferentially on the front side of the disc 1, one end of the T-slot 11 extends into the side of the central protrusion 9, and the other end extends to the annular stepped opening 10; an arc-shaped insert plate 15 is fixed to the lower end of the arc-shaped fan blades 4, the arc-shaped insert plate 15 is configured to fit into the horizontal groove portion of the T-slot 11, and the arc-shaped fan blades 4 are configured to fit into the vertical groove portion of the T-slot 11; a limiting ring 3 is installed on the annular stepped opening 10 by screws, and multiple extended fan blades 5 are provided on the limiting ring 3, which correspond one-to-one with and are in contact with the arc-shaped fan blades 4.

[0028] By implementing the above technical solution, during assembly, the integral structure connected by multiple arc-shaped fan blades 4 and arc-shaped insert plates 15 is first inserted into the corresponding T-shaped slots 11 one by one, so that the inner end of the integral structure is deeply inserted into the groove on the side of the central protrusion 9, and the outer end is flush with the vertical surface of the annular step opening 10. Then, the limiting ring 3 is put on, so that the inner wall of the limiting ring 3 contacts the vertical surface of the annular step opening 10 and restricts the outward movement of the integral structure. Then, the limiting ring 3 is fixed on the wheel 1 by multiple screws.

[0029] This structure allows the curved fan blade 4 to be assembled in a detachable configuration, facilitating maintenance and cleaning after disassembly. Furthermore, the outward movement of the curved fan blade 4 can be limited simply by installing the limiting ring 3, preventing it from shifting outwards due to centrifugal force during rotation. Therefore, it maintains normal fan blade operation while offering the advantage of simple assembly. In addition, the extension fan blade 5 compensates for the insufficient length of the curved fan blade 4, making the airflow generated by this centrifugal fan impeller structure more stable. In this centrifugal fan impeller structure, the axial force-bearing surface of the curved fan blade 4 is the inner top or bottom surface of the entire T-slot 11. Compared to using connecting pieces, this provides a larger force-bearing surface and better stability. The radial force of the curved fan blade 4 is directly applied to the limiting ring 3, which offers better stability compared to direct force application via bolts.

[0030] In this embodiment, the limiting ring 3 is provided with a plurality of countersunk holes 14, and the stepped surface of the annular stepped opening 10 is provided with a plurality of screw holes 12 corresponding one-to-one with the countersunk holes 14. The screws screwed into the screw holes 12 are installed in the countersunk holes 14. The position of the limiting ring 3 is fixed by screwing the screws through the countersunk holes 14 and into the screw holes 12, thereby achieving the function of radial limiting.

[0031] In this embodiment, to further provide a screw structure, the screw is an internal polygonal countersunk screw 6. This internal polygonal countersunk screw 6 is used in conjunction with the countersunk hole 14 to conceal the screw head.

[0032] In this embodiment, the outer end of the arc-shaped fan blade 4 is provided with a vertical slot 16; the vertical slot 16 extends downward and penetrates the arc-shaped insert plate 15, and the inner end of the extended fan blade 5 is provided with a vertical insert plate 13 that fits into the vertical slot 16. With this arrangement, when the limiting ring 3 is inserted downward, multiple vertical insert plates 13 are simultaneously inserted into the corresponding vertical slots 16, so that the extended fan blade 5 and the arc-shaped fan blade 4 can be fitted and connected, improving the connection stability between the two.

[0033] In this embodiment, the outer end of the central protrusion 9 is configured as a spherical surface 2. This spherical surface 2 allows for better backflow during air intake.

[0034] In this embodiment, the curved fan blade 4 and the extended fan blade 5 have the same curvature and are concentrically arranged. The curved fan blade 4 and the extended fan blade 5 have the same thickness, and the connection points between the inner and outer surfaces of the curved fan blade 4 and the extended fan blade 5 are tangential to each other. This arrangement makes the connection between the curved fan blade 4 and the extended fan blade 5 smoother, thereby making the fanned airflow smoother.

[0035] In this embodiment, a connecting sleeve 7 is provided at the center of the back side of the wheel 1; the inner wall of the connecting sleeve 7 is provided with a plurality of keyways 8 along the circumferential direction.

[0036] This design facilitates the insertion of the drive motor shaft of the drive wheel 1 into the connecting sleeve 7, and prevents slippage between the shaft and the sleeve by the cooperation of the key and keyway 8 on the side of the shaft.

[0037] In this embodiment, to further provide a structure for the arc-shaped fan blade 4, the upper surface of the arc-shaped fan blade 4 is configured as a sloping straight surface 17 near its inner end; the upper surface of the arc-shaped fan blade 4 is configured as a flat straight surface 18 near its outer end, and the flat straight surface 18 is parallel to the surface of the wheel 1; the distance between the sloping straight surface 18 and the surface of the wheel 1 gradually increases along the bending direction of the arc-shaped fan blade 4. The sloping straight surface 18 provides better air intake at the inner end of the arc-shaped fan blade 4.

[0038] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0039] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this utility model will not describe the various possible combinations separately.

[0040] Furthermore, various different embodiments of this utility model can be combined in any way, as long as they do not violate the spirit of this utility model, they should also be regarded as the content disclosed by this utility model.

Claims

1. A centrifugal fan impeller structure, characterized in that, The centrifugal fan impeller structure includes a disc (1) and multiple arc-shaped fan blades (4) arranged circumferentially on the front of the disc (1); The wheel (1) has an annular stepped opening (10) at the front edge and a central protruding post (9) at the front center. The front of the wheel (1) is provided with a plurality of arc-shaped T-shaped slots (11) along the circumference. One end of the T-shaped slot (11) extends into the side of the central protrusion (9), and the other end extends to the annular step opening (10). The lower end of the arc-shaped fan blade (4) is fixed with an arc-shaped insert plate (15). The arc-shaped insert plate (15) is configured to fit into the horizontal slot portion of the T-shaped slot (11), and the arc-shaped fan blade (4) is configured to fit into the vertical slot portion of the T-shaped slot (11). A limiting ring (3) is installed on the annular step opening (10) by screws. The limiting ring (3) is provided with a plurality of extended fan blades (5) that correspond one-to-one with and are in contact with the arc-shaped fan blades (4).

2. The centrifugal fan impeller structure according to claim 1, characterized in that, The limiting ring (3) is provided with a plurality of countersunk holes (14), and the annular step opening (10) is provided with a plurality of screw holes (12) corresponding one-to-one with the countersunk holes (14). The screws screwed into the screw holes (12) are installed in the countersunk holes (14).

3. The centrifugal fan impeller structure according to claim 2, characterized in that, The screw is an internal polygonal countersunk screw (6).

4. The centrifugal fan impeller structure according to claim 1, characterized in that, The outer end of the arc-shaped fan blade (4) is provided with a vertical slot (16); The vertical slot (16) extends downward and passes through the arc-shaped insert plate (15), and the inner end of the extended fan blade (5) is provided with a vertical insert plate (13) that fits into the vertical slot (16).

5. The centrifugal fan impeller structure according to claim 1, characterized in that, The outer end of the central protrusion (9) is set as a spherical surface (2).

6. The centrifugal fan impeller structure according to claim 1, characterized in that, The arc-shaped fan blade (4) has the same arc as the extended fan blade (5) and is concentrically arranged.

7. The centrifugal fan impeller structure according to claim 1, characterized in that, A connecting sleeve (7) is provided at the center of the back of the wheel (1); The inner wall of the connecting sleeve (7) is provided with multiple keyways (8) along the circumferential direction.

8. The centrifugal fan impeller structure according to claim 1, characterized in that, The upper surface of the arc-shaped fan blade (4) is set as an inclined straight surface (17) near the inner end; The upper surface of the arc-shaped fan blade (4) is set as a flat surface (18) near the outer end, and the flat surface (18) is parallel to the surface of the wheel (1); The distance between the inclined straight surface (17) and the surface of the wheel (1) gradually increases along the bending direction of the arc-shaped fan blade (4).

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