A multi-blade centrifugal fan impeller and centrifugal fan
The multi-blade centrifugal fan impeller design, which is integrally injection molded, solves the problems of manufacturing complexity and assembly error in the existing technology, improves the stability and strength of the impeller, reduces mold complexity and noise, and is suitable for use in small and medium-sized equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WOLONG ELECTRIC GRP CO LTD
- Filing Date
- 2025-08-05
- Publication Date
- 2026-07-14
AI Technical Summary
The manufacturing process of existing multi-blade centrifugal fan impellers is complex and the assembly error is large, resulting in large vibration, low efficiency, high noise and high cost. Traditional mold structures are complex and difficult to apply to small and medium-sized equipment.
The impeller adopts an integrated injection molding design and is demolded by a double-sided axial core pulling method, which eliminates assembly errors and simplifies the mold structure. The design includes a front plate, middle plate and rear plate. The connection method makes the blades stable and reduces manufacturing difficulty.
It improves the stability and strength of the impeller, reduces mold complexity and manufacturing difficulty, and reduces noise and vibration, making it suitable for small and medium-sized equipment applications.
Smart Images
Figure CN224496878U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of centrifugal fan technology, and in particular to a multi-blade centrifugal fan impeller and a centrifugal fan. Background Technology
[0002] Centrifugal fans are widely used in ventilation and cooling, and the design and manufacturing precision of their core component, the impeller, directly affects the overall performance, noise level, and service life of the fan. In multi-blade fans, the forward-curved blade structure is widely used due to its high static pressure performance, making it particularly suitable for applications with smaller airflow and higher static pressure requirements, such as in the power components of range hoods.
[0003] Currently, most mainstream multi-blade centrifugal fan impellers are made of metal, with the blades and front and rear discs assembled or welded manually. Although metal has high strength, its manufacturing process is complex, assembly errors are large, and it is difficult to ensure the consistency of the angle and spacing of all blades. This results in large vibrations, low efficiency, high noise, and high cost during operation, which is not conducive to the mass application of small and medium-sized equipment.
[0004] In existing technologies, the impeller can be replaced with a plastic injection molding structure. However, due to the large number of blades, the large forward tilt angle, and the dense arrangement, traditional molds often require radial sliders for demolding each blade, resulting in an extremely complex mold structure and high cost, making it difficult to implement in practice.
[0005] Therefore, how to provide a multi-blade centrifugal fan impeller and centrifugal fan to at least partially improve the above-mentioned drawbacks is a technical problem that needs to be solved by those skilled in the art. Utility Model Content
[0006] The purpose of this invention is to provide a multi-blade centrifugal fan impeller and centrifugal fan. The integrated injection molding process can eliminate traditional assembly errors. During the injection molding process, the impeller can be easily demolded by a double-sided axial core pulling method, eliminating the need to configure an independent radial slider for each blade, thus greatly reducing the complexity of the mold structure and the difficulty of manufacturing.
[0007] To achieve the above objectives, this utility model provides a multi-blade centrifugal fan impeller, comprising an integrally injection-molded impeller body. The impeller body includes a front disc, a middle disc, a rear disc, and multiple blades. The front disc and the rear disc are located at the two ends of the blades in the axial direction of the impeller body, respectively. The rear disc is connected to the outer side of the blades in the radial direction of the impeller body. The front disc is connected to the middle part of the blades in the radial direction of the impeller body. The middle disc is connected to the inner side of the blades in the radial direction of the impeller body, and the middle disc is located between the front disc and the rear disc. The radial projections of the front disc, the middle disc, and the rear disc do not overlap.
[0008] In one possible implementation, the axial distance between the middle disc and the front disc on the impeller body is equal to the axial distance between the middle disc and the rear disc on the impeller body.
[0009] In one possible implementation, the projections of the front plate, middle plate, and rear plate onto the impeller body radially cover different regions of the blade chord length, and the sum of the lengths of the blade chord length L1 corresponding to the coverage area of the front plate, the length of the blade chord length L2 corresponding to the coverage area of the rear plate, and the length of the blade chord length L3 corresponding to the coverage area of the middle plate is equal to the length of the blade chord length L on the impeller body radially.
[0010] In one possible implementation, the chord length L1 of the blade corresponding to the coverage area of the front disc in the radial direction of the impeller body is equal to the chord length L2 of the blade corresponding to the coverage area of the rear disc in the radial direction of the impeller body, and the chord length L1 of the blade corresponding to the coverage area of the front disc in the radial direction of the impeller body is equal to the chord length L3 of the blade corresponding to the coverage area of the middle disc in the radial direction of the impeller body.
[0011] In one possible implementation, the axes of the front and rear discs are both collinear with the axis of the middle disc.
[0012] In one possible implementation, the outer edge of the rear disc is flush with the outer edge of the blade.
[0013] In one possible implementation, the blades gradually extend radially along the impeller body and are curved and streamlined.
[0014] In one possible implementation, the center plate is further provided with mounting holes for mounting a hub that mates with the drive shaft, so that the center plate can rotate synchronously when the drive shaft drives the hub to rotate.
[0015] In one possible implementation, an airflow channel is formed between adjacent blades, and the airflow channel has a flared structure along the airflow direction.
[0016] Based on the above, this application also provides a centrifugal fan, including a drive shaft and any one of the multi-blade centrifugal fan impellers, wherein the drive shaft is used to drive the impeller body to rotate around its own axis.
[0017] Compared with the prior art, the technical solution provided by this utility model has at least the following beneficial effects: by integrally injection molding to form an impeller body including a front plate, a middle plate, a rear plate and multiple blades, the traditional assembly error can be eliminated. The front plate and the rear plate are respectively located at the two ends of the blades in the axial direction of the impeller body, making the multi-blade centrifugal fan impeller as a whole stable. The middle plate is connected to the inner side of the blades in the radial direction of the impeller body, and the middle plate is located between the front plate and the rear plate, which is used to strengthen the overall strength of the multi-blade centrifugal fan impeller. The rear plate is connected to the outer side of the blades in the radial direction of the impeller body, and the front plate is connected to the middle part of the blades in the radial direction of the impeller body. The radial projections of the front plate, the middle plate and the rear plate do not overlap. During the injection molding process, the mold can be easily demolded by the double-sided axial core pulling method, without the need to configure an independent radial slider for each blade, which greatly reduces the complexity of the mold structure and the manufacturing difficulty. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the structure of the multi-blade centrifugal fan impeller provided in an embodiment of the present utility model;
[0020] Figure 2 This is a structural schematic diagram of the multi-blade centrifugal fan impeller provided in an embodiment of the present invention from another perspective.
[0021] in:
[0022] 100 - front plate, 200 - middle plate, 300 - rear plate, 400 - blade. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0025] In the description of this utility model, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations of this utility model.
[0026] The purpose of this invention is to provide a multi-blade centrifugal fan impeller and centrifugal fan. The integrated injection molding process can eliminate traditional assembly errors. During the injection molding process, the impeller can be easily demolded by a double-sided axial core pulling method, eliminating the need to configure an independent radial slider for each blade, thus greatly reducing the complexity of the mold structure and the difficulty of manufacturing.
[0027] Please see Figure 1 and Figure 2 To achieve the above objectives, this utility model provides a multi-blade centrifugal fan impeller, comprising an integrally injection-molded impeller body. The impeller body includes a front disc 100, a middle disc 200, a rear disc 300, and multiple blades 400. The front disc 100 and the rear disc 300 are respectively located at both ends of the blades 400 in the axial direction of the impeller body. The front disc 100 and the rear disc 300 form a clamping and fixing of the blades 400 in the axial direction. The rear disc 300 is connected to the outer side of the blades 400 in the radial direction of the impeller body. The front disc 100 is connected to the middle part of the blades 400 in the radial direction of the impeller body. The middle disc 200 is connected to the inner side of the blades 400 in the radial direction of the impeller body, and the middle disc 200 is located between the front disc 100 and the rear disc 300. The radial projections of the front disc 100, the middle disc 200, and the rear disc 300 do not overlap. The middle part refers to the area between the outer and inner sides of the blades 400.
[0028] It is understandable that the impeller body can rotate around its own axis and drive the air along the inner side of the blade 400 and out along the outer side of the blade 400 through the blade 400. The blade 400 can be a forward-curved blade 400, which has high static pressure performance and is particularly suitable for application scenarios with small air volume and high static pressure requirements, such as in the power components of range hoods.
[0029] It should be noted that the impeller is made of high-performance thermoplastic plastic through a one-piece injection molding process. The high-performance thermoplastic plastic can be, but is not limited to, glass fiber reinforced nylon or PPS. The specific type of high-performance thermoplastic plastic can be selected according to actual needs, as long as it can achieve the above purpose.
[0030] The impeller body, consisting of a front disc 100, a middle disc 200, a rear disc 300, and multiple blades 400, is formed by integral injection molding. This eliminates traditional assembly errors. The front disc 100 and the rear disc 300 are located at the two ends of the blades 400 in the axial direction of the impeller body, making the multi-blade centrifugal fan impeller as a whole stable. The middle disc 200 is connected to the inner side of the blades 400 in the radial direction of the impeller body and is located between the front disc 100 and the rear disc 300 to enhance the overall strength of the multi-blade centrifugal fan impeller. The rear disc 300 is connected to the outer side of the blades 400 in the radial direction of the impeller body, and the front disc 100 is connected to the middle part of the blades 400 in the radial direction of the impeller body. The radial projections of the front disc 100, the middle disc 200, and the rear disc 300 do not overlap. During the injection molding process, the impeller can be easily demolded by a double-sided axial core pulling method, eliminating the need for an independent radial slider for each blade 400, and significantly reducing the complexity of the mold structure and the manufacturing difficulty.
[0031] In one possible implementation, the axial distance between the middle disk 200 and the front disk 100 on the impeller body is equal to the axial distance between the middle disk 200 and the rear disk 300 on the impeller body, that is, the middle disk 200 is located at the middle position of the blades 400 on the impeller body axis. The middle disk 200 is used to enhance the stability of the impeller structure and effectively reduce the shaking during impeller rotation. The blades 400 are evenly arranged in the circumferential direction of the impeller body, which helps to maintain a preset distance between adjacent blades 400 and effectively ensure uniform airflow. The number of blades 400 is preferably 40 to 48, and the number of blades 400 can be adjusted according to actual needs to achieve a good performance.
[0032] In one possible implementation, the projections of the front disc 100, middle disc 200, and rear disc 300 onto the impeller body in the radial direction respectively cover different regions of the chord length of the blade 400. The sum of the lengths L1, L2, and L3 of the chord length of the blade 400 in the impeller body corresponding to the coverage area of the front disc 100, L2, and L3, respectively, equals the length L of the chord length of the blade 400 in the impeller body in the radial direction. The sum of L1, L2, and L3 is the projected length of the blade 400 in the impeller body in the radial direction. This structural division ensures that the mold can be easily demolded during injection molding using a double-sided axial core-pulling method, eliminating the need for an independent radial slider for each blade 400, significantly reducing the complexity of the mold structure and the difficulty of manufacturing. Furthermore, the outer edge of the rear plate 300 is flush with the outer edge of the blade 400 to effectively avoid the problem of excessively large impeller volume in multi-blade centrifugal fans.
[0033] In one possible implementation, the chord length L1 of the blade 400 corresponding to the coverage area of the front disc 100 in the radial direction of the impeller body is equal to the chord length L2 of the blade 400 corresponding to the coverage area of the rear disc 300 in the radial direction of the impeller body, and the chord length L1 of the blade 400 corresponding to the coverage area of the front disc 100 in the radial direction of the impeller body is equal to the chord length L3 of the blade 400 corresponding to the coverage area of the middle disc 200 in the radial direction of the impeller body. The front disc 100 and the middle disc 200... The chord length of the blade 400 corresponding to the coverage area of the rear disc 300 is the same as the radial length of the impeller body, so as to ensure that the front disc 100, the middle disc 200 and the rear disc 300 all have a certain contact area with the blade 400, which can effectively ensure the structural strength of the impeller body. In addition, the front disc 100, the middle disc 200 and the rear disc 300 can all be set as annular structures, and the axis of the front disc 100 and the axis of the rear disc 300 are collinear with the axis of the middle disc 200, which is beneficial to the swaying during the rotation of the impeller body.
[0034] In one possible implementation, the intermediate plate 200 is also provided with mounting holes for mounting a hub that mates with the drive shaft, so that when the drive shaft drives the hub to rotate, it can drive the intermediate plate 200 to rotate synchronously. Specifically, the hub is connected to the mounting holes and the hub is connected to the drive shaft, so that the drive shaft, the hub and the multi-blade centrifugal fan impeller are fixed as a whole. When the power source drives the drive shaft to rotate around its own axis, it drives the hub and the multi-blade centrifugal fan impeller to rotate synchronously. The mounting holes are evenly arranged along the circumference of the intermediate plate 200 to effectively ensure the stable connection between the hub and the intermediate plate 200.
[0035] The impeller features an airflow channel formed between adjacent blades 400, which has a flared structure along the airflow direction. When the hub and multi-blade centrifugal fan impeller rotate, air enters the airflow channel along the inner edge of the blades 400 and exits from the outer edge. The inner edge of the blades 400 refers to their inner side edge, and the outer edge refers to their outer side edge. The blades 400 gradually expand radially along the impeller body and have a curved streamline shape. The thickness of the inner edge of the blades 400 is greater than the thickness of the outer edge. The thickness of the blades 400 gradually increases from their inner side to the middle and gradually decreases from their middle to the outer side to ensure a balance between structural strength and aerodynamic performance. The blades 400 have a first tilt angle at their inner edge, which can be set to 65° to 70°, preferably 68°. The blades 400 have a second tilt angle at their outer edge, which can be set to 160° to 170°, preferably 166°.
[0036] Based on the above, this application also provides a centrifugal fan, including a drive shaft and any one of the multi-blade centrifugal fan impellers. The drive shaft is used to drive the impeller body to rotate around its own axis so that the blades 400 of the impeller body drive the gas flow. The remaining structure of the centrifugal fan can refer to the prior art, and will not be described in detail here.
[0037] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.
[0038] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0039] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.
Claims
1. A multi-blade centrifugal fan impeller, characterized in that, The impeller body is integrally injection molded. The impeller body includes a front disc (100), a middle disc (200), a rear disc (300), and a plurality of blades (400). The front disc (100) and the rear disc (300) are respectively located at the two ends of the blades (400) in the axial direction of the impeller body. The rear disc (300) is connected to the outer side of the blades (400) in the radial direction of the impeller body. The front disc (100) is connected to the middle part of the blades (400) in the radial direction of the impeller body. The middle disc (200) is connected to the inner side of the blades (400) in the radial direction of the impeller body. The middle disc (200) is located between the front disc (100) and the rear disc (300). The projections of the front disc (100), the middle disc (200), and the rear disc (300) in the radial direction of the impeller body do not overlap.
2. The multi-blade centrifugal fan impeller according to claim 1, characterized in that, The distance between the middle disk (200) and the front disk (100) on the axial direction of the impeller body is equal to the distance between the middle disk (200) and the rear disk (300) on the axial direction of the impeller body.
3. The multi-blade centrifugal fan impeller according to claim 1, characterized in that, The projections of the front disc (100), the middle disc (200), and the rear disc (300) on the radial direction of the impeller body respectively cover different regions of the chord length of the blade (400). The sum of the lengths of the blade (400) chord length L1 corresponding to the coverage area of the front disc (100), the length of the blade (400) chord length L2 corresponding to the coverage area of the rear disc (300), and the length of the blade (400) chord length L3 corresponding to the coverage area of the middle disc (200) on the radial direction of the impeller body is equal to the length L of the blade (400) chord length on the radial direction of the impeller body.
4. The multi-blade centrifugal fan impeller according to claim 3, characterized in that, The length L1 of the chord length of the blade (400) corresponding to the coverage area of the front disc (100) in the radial direction of the impeller body is equal to the length L2 of the chord length of the blade (400) corresponding to the coverage area of the rear disc (300) in the radial direction of the impeller body, and the length L1 of the chord length of the blade (400) corresponding to the coverage area of the front disc (100) in the radial direction of the impeller body is equal to the length L3 of the chord length of the blade (400) corresponding to the coverage area of the middle disc (200) in the radial direction of the impeller body.
5. The multi-blade centrifugal fan impeller according to any one of claims 1-4, characterized in that, The axes of the front disc (100) and the rear disc (300) are both collinear with the axis of the middle disc (200).
6. The multi-blade centrifugal fan impeller according to any one of claims 1-4, characterized in that, The outer edge of the rear disc (300) is flush with the outer edge of the blade (400).
7. The multi-blade centrifugal fan impeller according to any one of claims 1-4, characterized in that, The blade (400) gradually extends radially along the impeller body and has a curved streamline shape.
8. The multi-blade centrifugal fan impeller according to any one of claims 1-4, characterized in that, The middle plate (200) is also provided with mounting holes for mounting a hub that cooperates with the drive shaft, so that when the drive shaft drives the hub to rotate, it can drive the middle plate (200) to rotate synchronously.
9. The multi-blade centrifugal fan impeller according to any one of claims 1-4, characterized in that, An airflow channel is formed between adjacent blades (400), and the airflow channel has a flared structure along the airflow direction.
10. A centrifugal fan, characterized in that, It includes a drive shaft and a multi-blade centrifugal fan impeller as described in any one of claims 1-9, wherein the drive shaft is used to drive the impeller body to rotate about its own axis.