Multi-wing centrifugal impeller and efficient double-air-inlet centrifugal fan

Abstract

The impeller comprises a front disc, a middle disc, a rear disc and blade assemblies, wherein the front disc, the middle disc and the rear disc are coaxially arranged in parallel, and the blade assemblies are connected among the front disc, the middle disc and the rear disc. The distance between the front disc and the middle disc is larger than that between the rear disc and the middle disc, each blade comprises a front blade section formed by bending and located between the front disc and the middle disc and a rear blade section formed by bending and located between the middle disc and the rear disc, the front blade section and the middle disc are inclined at an acute angle, and the rear blade section is perpendicular to the middle disc; the blade width of the front blade section is gradually increased from the front disc to the middle disc, and the blade width of the rear blade section is gradually reduced from the middle disc to the rear disc, so that the blade utilization rate is high, the total pressure efficiency of the fan system is improved, and the air performance of the fan system is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of fan systems, in particular to a multi-blade centrifugal impeller and a high-efficiency double-inlet centrifugal fan. Background Art

[0002] Oil fume suction and exhaust equipment usually uses a double-inlet centrifugal fan, which means that it can suck in air containing oil smoke from two directions at the same time. This design can increase the air intake of the fan and improve the efficiency of oil fume extraction. The double-inlet centrifugal fan includes a motor, an impeller and a volute. There are air inlets on both sides of the volute. The impeller includes a wheel frame and a blade assembly. The motor includes a motor body and an output shaft. The motor body is arranged on one side of the wheel frame and is fixed to the volute. The wheel frame is connected to the output shaft. Usually the wheel frame includes a front disc, a middle disc and a rear disc arranged in parallel. The blades are arranged at intervals along the circumference of the middle disc, and the two ends are connected to the front disc and the rear disc.

[0003] In order to improve the efficiency of a centrifugal fan, those skilled in the art usually design the inner edge, outer edge and angle of the blades to improve the efficiency of the centrifugal fan.

[0004] Patent CN219865582U discloses an impeller for a double-inlet centrifugal fan, a centrifugal fan, and an oil fume suction and exhaust device. The impeller design includes front and rear discs and a middle disc, and the blades are arranged at intervals along the circumference of the middle disc. The special feature is that the design of the blades can reduce the difference in flow state on both sides of the impeller, reduce secondary flow, thereby improving fan performance and reducing noise. The blades are designed such that the first blade profile includes at least two arc segments that are sequentially connected from the first side to the second side and whose curvature radius increases sequentially, and the second blade profile includes at least three arc segments that are sequentially connected from the third side to the fourth side and whose curvature radius increases sequentially. The arc length of the first blade profile is smaller than the arc length of the second blade profile, and at least one arc of the first blade at the air inlet end adjacent to the impeller overlaps with the projection of at least one arc of the second blade at the air inlet end adjacent to the impeller in the axial direction of the impeller.

[0005] Patent application CN117703825A discloses an impeller for a dual-inlet centrifugal fan, a centrifugal fan, and an oil fume suction and exhaust device. The impeller comprises: a first disc and a rear disc; blades circumferentially distributed between the first disc and the rear disc, each blade having a first end for connecting to the first disc and a second end for connecting to the rear disc, and each blade also having a leading edge corresponding to the air inlet side and a trailing edge corresponding to the air outlet side; a middle disc located between the first disc and the rear disc and connected to each blade; each blade is divided by the location of the middle disc into a front blade segment adjacent to the first disc and a rear blade segment adjacent to the rear disc; the front blade segment is generally inclined toward the side where the trailing edge of the blade is located from the location of the middle disc to the location of the first disc, and the rear blade segment is generally inclined toward the side where the trailing edge of the blade is located from the location of the middle disc to the location of the rear disc.

[0006] Since the axial airflow is blocked by the center disk and then turns horizontally to enter between the blades, even if the shape of the airflow channel is adjusted by adjusting the inner edge, outer edge and angle of the blade, the problem of low utilization rate of the outer part of the blade away from the center disk cannot be improved, so there is still a lot of room for improvement in work efficiency. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a multi-blade centrifugal impeller with higher blade utilization and efficiency and a high-efficiency double-inlet centrifugal fan.

[0008] The technical solution adopted by the utility model to solve the above technical problems is: a multi-blade centrifugal impeller, characterized in that it includes a front disc, a middle disc, a rear disc arranged in parallel and coaxially, and a blade assembly connected between the three; the distance between the front disc and the middle disc is greater than the distance between the rear disc and the middle disc;

[0009] The blade assembly includes a plurality of blades distributed at circumferential intervals, the first end of each blade is connected to the front disk and the second end is connected to the rear disk, the middle portion passes through the through hole of the middle disk and is fixed to the middle disk; each blade includes a bent front blade section located between the front disk and the middle disk and a rear blade section located between the middle disk and the rear disk, the front blade section is inclined at an acute angle to the middle disk, and the rear blade section is perpendicular to the middle disk; the blade width of the front blade section gradually increases from the front disk to the middle disk, and the blade width of the rear blade section gradually decreases from the middle disk to the rear disk.

[0010] The preferred technical solution adopted by the present invention to solve the above technical problems is that the root blade width of the front blade section close to the middle disk is consistent with the root blade width of the rear blade section close to the middle disk.

[0011] The preferred technical solution adopted by the present invention to solve the above technical problems is: the root blade width of the front blade section close to the middle disk is greater than 1.5 times the end blade width of the front blade section close to the front disk.

[0012] The preferred technical solution adopted by the present invention to solve the above technical problems is: the inclination angle range of the front blade section and the middle disc is 45°-60°.

[0013] The preferred technical solution adopted by the present invention to solve the above technical problems is: a deformation part is provided in the middle section of each blade, and the deformation part is formed by extrusion after the blade passes through the through hole of the middle disk. The deformation part enables the blade to be clamped in the through hole of the middle disk.

[0014] The preferred technical solution adopted by the present invention to solve the above technical problems is: ears are provided at both ends of each blade, and a neck portion is provided between the ear and the blade body. After the ear passes through the front disk or the rear disk, the neck portion is bent, and the ear is tightly pressed on the outer end surface of the front disk or the rear disk.

[0015] The preferred technical solution adopted by the present invention to solve the above technical problem is: the deformation portion is located at the outer edge of the blade and is concave from the outside to the inside.

[0016] The preferred technical solution adopted by the present invention to solve the above technical problems is: a multi-blade centrifugal impeller includes a front disc, a middle disc, a rear disc and a blade assembly connected between the three discs, which are arranged in parallel and coaxially; the distance between the front disc and the middle disc is greater than the distance between the rear disc and the middle disc;

[0017] The blade assembly includes a plurality of blades distributed at circumferential intervals, the first end of each blade being connected to the front disk and the second end being connected to the rear disk, and the middle portion passes through the through hole of the middle disk and is fixed to the middle disk; each blade includes a front blade section formed by bending and located between the front disk and the middle disk, and a rear blade section between the middle disk and the rear disk, the outer edge of the middle section of each blade is provided with a deformation portion which is concave from the outside to the inside, the deformation portion is formed by extrusion after the blade passes through the through hole of the middle disk, and the deformation portion enables the blade to be clamped in the through hole of the middle disk; the front blade section is inclined at an acute angle to the middle disk, and the rear blade section is perpendicular to the middle disk; the blade width of the front blade section gradually expands from the front disk to the middle disk, and the blade width of the rear blade section gradually decreases from the middle disk to the rear disk.

[0018] The preferred technical solution adopted by the present invention to solve the above technical problems is: the root blade width of the front blade segment close to the middle disk is consistent with the root blade width of the rear blade segment close to the middle disk; the root blade width of the front blade segment close to the middle disk is greater than 1.5 times the end blade width of the front blade segment close to the front disk; the inclination angle range of the front blade segment and the middle disk is 45°-60°.

[0019] The preferred technical solution adopted by the present invention to solve the above technical problems is: a high-efficiency double-inlet centrifugal fan, including a volute, a motor and the multi-blade centrifugal impeller, the output shaft of the motor passes through the middle of the middle disk and is fixed, and the motor body of the motor is located on the rear side of the middle disk.

[0020] Compared with existing technologies, the advantages of this utility model are: the inclined front blade section design improves the utilization rate of the blades in the first zone, thereby significantly improving the fan's energy conversion efficiency and achieving a supercharging effect. The blade width design, which is wide in the middle and narrow at the edges, increases the working area within the airflow channel, increasing work in both the first and second zones, and significantly improving total pressure efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described in further detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will appreciate that these drawings are drawn only for the purpose of explaining the preferred embodiments and should not be construed as limiting the scope of the present invention. Furthermore, unless otherwise specified, the drawings are merely schematic representations of the composition or structure of the depicted objects and may contain exaggerated representations. Furthermore, the drawings are not necessarily drawn to scale.

[0022] Figure 1 A schematic diagram of a multi-blade centrifugal impeller according to a preferred embodiment Figure 1 ;

[0023] Figure 2 This is an enlarged view of point A of a multi-blade centrifugal impeller according to a preferred embodiment;

[0024] Figure 3 This is an enlarged view of point B of a multi-blade centrifugal impeller according to a preferred embodiment;

[0025] Figure 4 This is an enlarged view of point C of a multi-blade centrifugal impeller in a preferred embodiment;

[0026] Figure 5 Schematic diagram of a blade according to a preferred embodiment. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely illustrative and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0028] It should be noted that like reference numerals denote like items in the following drawings, and therefore, once an item is defined in one drawing, it will not be further defined or explained in the subsequent drawings.

[0029] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "back," "left," "right," "inner," and "outer" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific direction, be constructed, or operate in a specific direction. Therefore, they should not be construed as limitations on this utility model. The terms "first" and "second" are used solely to facilitate understanding and have no other directional meanings, and should not be construed as limitations on this utility model.

[0030] High-efficiency double-inlet centrifugal fan, including volute, motor and multi-blade centrifugal impeller. Figure 1-4 As shown, the multi-blade centrifugal impeller comprises a front disc 1, a middle disc 2, and a rear disc 3, all arranged parallel and coaxially, and a blade assembly 4 connected therebetween. The distance between the front disc 1 and the middle disc 2 is greater than the distance between the rear disc 3 and the middle disc 2. The motor output shaft passes through the middle of the middle disc 2 and is fixed there. The motor body is located behind the middle disc 2.

[0031] like Figure 1-4 As shown, the blade assembly 4 includes a plurality of circumferentially spaced blades 41. Each blade 41 is connected to the front disk 1 at its first end and to the rear disk 3 at its second end. The blade 41 extends through a through-hole S in the center disk 2 and is secured to the center disk 2. Each blade 41 includes a bent front blade segment 41a positioned between the front disk 1 and the center disk 2, and a rear blade segment 41b positioned between the center disk 2 and the rear disk 3. The front blade segment 41a encloses a first zone, and the rear blade segment 41b encloses a second zone. When the motor is running and the impeller rotates, airflow enters the first and second zones from between the front and rear disks 1 and 3, then enters the airflow channel between the blades 41, and finally flows out from the outer edge e of the blade 41.

[0032] In this embodiment, the front blade section 41a is inclined at an acute angle to the center disk 2, while the rear blade section 41b is perpendicular to the center disk 2. The width of the blades 41 in the front blade section 41a gradually increases from the front disk 1 to the center disk 2, while the width of the blades 41 in the rear blade section 41b gradually decreases from the center disk 2 to the rear disk 3. The inclined design of the front blade section 41a improves the utilization rate of the blades 41 in the first zone, thereby significantly enhancing the energy conversion efficiency of the fan and achieving a supercharging effect. The design of the blades 41, which are wider in the middle and narrower at the edges, increases the work area within the airflow channel, increasing work in both the first and second zones and significantly improving total pressure efficiency.

[0033] Specifically, in some embodiments, the width of the blades 41 at the root of the front blade segment 41a near the center disk 2 is preferably the same as the width of the blades 41 at the root of the rear blade segment 41b near the center disk 2. In some embodiments, the width of the blades 41 at the root of the front blade segment 41a near the center disk 2 is greater than 1.5 times the width of the blades 41 at the end of the front blade segment 41a near the front disk 1. In some embodiments, the inclination angle between the front blade segment 41a and the center disk 2 ranges from 45° to 60°. The inner edge f and outer edge e of the blades are both curved.

[0034] like Figure 1 、 5As shown, each blade 41 is equipped with tabs 10 at both ends, and a constricted portion 20 is located between the tabs 10 and the main body of the blade 41. During installation, the vertical rear segment 41b of the blade 41 passes through the hole S in the center plate 2. The hole S in the center plate 2 is sized to fit the bend 30 in the middle section of the blade 41. After the blade 41 reaches the bend 30, it is restrained. The ends of the blade 41 are then connected to the front plate 1 and rear plate 3, respectively. After passing through the front plate 1 or rear plate 3, the tabs 10 bend around the constricted portion 20, pressing tightly against the outer end surface of the front plate 1 or rear plate 3.

[0035] Further, if Figure 3-4 As shown, the roots of the blades 41 on both sides of the center disk 2 are rolled, and the middle section of the blades 41 is squeezed, so that a deformation portion 40 is formed in the middle section of each blade 41. The deformation portion 40 allows the blade 41 to be clamped in the through hole S of the center disk 2. The deformation portion 40 is located at the outer edge e of the blade 41 and is concave from the outside to the inside.

[0036] The multi-blade centrifugal impeller and high-efficiency dual-inlet centrifugal fan provided by the present invention are introduced. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The above examples are merely intended to facilitate understanding of the present invention and its core concept. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. Multi-blade centrifugal impeller, characterized by It includes a front disc, a middle disc, a rear disc and a blade assembly connected between the three discs, which are arranged in parallel and coaxially; the distance between the front disc and the middle disc is greater than the distance between the rear disc and the middle disc; The blade assembly includes a plurality of blades distributed at circumferential intervals, the first end of each blade is connected to the front disk and the second end is connected to the rear disk, the middle portion passes through the through hole of the middle disk and is fixed to the middle disk; each blade includes a bent front blade section located between the front disk and the middle disk and a rear blade section located between the middle disk and the rear disk, the front blade section is inclined at an acute angle to the middle disk, and the rear blade section is perpendicular to the middle disk; the blade width of the front blade section gradually increases from the front disk to the middle disk, and the blade width of the rear blade section gradually decreases from the middle disk to the rear disk.

2. The multi-blade centrifugal impeller according to claim 1, characterized in that The width of the root blade of the front blade section close to the middle disk is consistent with the width of the root blade of the rear blade section close to the middle disk.

3. The multi-blade centrifugal impeller according to claim 1, characterized in that The width of a blade at a root portion of the front blade segment close to the middle disk is greater than 1.5 times the width of a blade at an end portion of the front blade segment close to the front disk.

4. The multi-blade centrifugal impeller according to claim 1, characterized in that The inclination angle between the front leaf section and the middle disc ranges from 45° to 60°.

5. The multi-blade centrifugal impeller according to claim 1, characterized in that A deformation portion is provided in the middle section of each blade. The deformation portion is formed by extrusion after the blade passes through the through hole of the middle disk. The deformation portion enables the blade to be clamped in the through hole of the middle disk.

6. The multi-blade centrifugal impeller according to claim 1, characterized in that Each blade has ears at both ends, and a neck portion is provided between the ear and the blade body. After the ear passes through the front disk or the rear disk, the neck portion is bent and the ear is tightly pressed against the outer end surface of the front disk or the rear disk.

7. The multi-blade centrifugal impeller according to claim 5, characterized in that The deformation portion is located at the outer edge of the blade and is concave from the outside to the inside.

8. Multi-blade centrifugal impeller, characterized by It includes a front disc, a middle disc, a rear disc and a blade assembly connected between the three discs, which are arranged in parallel and coaxially; the distance between the front disc and the middle disc is greater than the distance between the rear disc and the middle disc; The blade assembly includes a plurality of blades distributed at circumferential intervals, the first end of each blade being connected to the front disk and the second end being connected to the rear disk, and the middle portion passes through the through hole of the middle disk and is fixed to the middle disk; each blade includes a front blade section formed by bending and located between the front disk and the middle disk, and a rear blade section between the middle disk and the rear disk, the outer edge of the middle section of each blade is provided with a deformation portion which is concave from the outside to the inside, the deformation portion is formed by extrusion after the blade passes through the through hole of the middle disk, and the deformation portion enables the blade to be clamped in the through hole of the middle disk; the front blade section is inclined at an acute angle to the middle disk, and the rear blade section is perpendicular to the middle disk; the blade width of the front blade section gradually expands from the front disk to the middle disk, and the blade width of the rear blade section gradually decreases from the middle disk to the rear disk.

9. The multi-blade centrifugal impeller according to claim 8, characterized in that The root blade width of the front blade segment close to the middle disk is consistent with the root blade width of the rear blade segment close to the middle disk; the root blade width of the front blade segment close to the middle disk is greater than 1.5 times the end blade width of the front blade segment close to the front disk; the inclination angle range of the front blade segment and the middle disk is 45°-60°.

10. High efficiency double inlet centrifugal fan, characterized by It comprises a volute, a motor and a multi-blade centrifugal impeller as described in any one of claims 1 to 9, wherein the output shaft of the motor passes through the middle of the middle disk and is fixed, and the motor body of the motor is located at the rear side of the middle disk.

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