Centrifugal impeller and centrifugal fan

Abstract

The utility model discloses a centrifugal impeller and a centrifugal fan, and the centrifugal impeller comprises a front cover with an opening; the fan blade disc is arranged on the opposite side of the front cover, the middle of the fan blade disc protrudes in the direction close to the front cover to form a mounting part, and an air inlet is formed between the mounting part and the opening; the multiple blades are connected with the front cover and the mounting part respectively and located between the fan blade disc and the front cover, an air outlet channel communicated with the air inlet is formed between every two adjacent blades, the side, away from the mounting part, of each blade is of a curve structure, and the curve structures are used for silencing. The structure design is simple and reasonable, and the characteristics of noise reduction and efficient airflow conveying are achieved. Due to the design of the arc-shaped tangent planes, the air inlet guide parts, the air outlet guide parts, the curve structures and the like of the blades, impact and turbulent flow of airflow are reduced, abrasion to the fan blades and other components is correspondingly reduced, the service life of equipment is prolonged, and the maintenance cost of the equipment is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of centrifugal fan, in particular to a centrifugal impeller and centrifugal fan. BACKGROUND

[0002] The centrifugal fan is widely used, and the impeller is an important component of the centrifugal fan. The rotation of the impeller drives the flow of gas, and the structure of the impeller directly affects the overall performance of the fan. At present, the blades of the impeller of the domestic centrifugal fan are generally straight, which is simple in work, but in the process of operation of the fan, the outlet of the impeller is easy to form a "jet wake" phenomenon, resulting in large noise, low efficiency and other defects. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiment of the present application is to provide a centrifugal impeller, comprising:

[0004] A front cover having an opening;

[0005] A fan blade disc arranged on the opposite side of the front cover, the middle part of the fan blade disc protrudes towards the front cover to form a mounting part, the mounting part and the opening form an air inlet, and the end of the mounting part forms an air inlet guide part at the air inlet;

[0006] A plurality of blades connected with the front cover and the mounting part respectively and located between the fan blade disc and the front cover, the adjacent two blades form an air outlet channel communicated with the air inlet, the side of the blade away from the mounting part is a curve structure, and the curve structure is used for sound attenuation.

[0007] As an optional embodiment, the fan blade disc further comprises a rear cover, the shape of the rear cover is matched with the shape of the front cover, and the rear cover is connected with one end of the mounting part.

[0008] As an optional embodiment, the mounting part is a shell structure in the shape of a bowl, the mounting part comprises a closed end and an open end, the closed end is arranged concentrically with the front cover, the convex surface of the closed end faces the wind to form the air inlet guide part, the closed end and the open end are in an arc structure, and the open end is connected with the rear cover to form an air outlet guide part.

[0009] As an optional embodiment, the blade comprises a first mounting surface, and the shape of the first mounting surface is matched with the arc structure between the closed end and the open end.

[0010] As an optional embodiment, the blade comprises a second mounting surface and a third mounting surface arranged oppositely, the second mounting surface is connected with the front cover, the third mounting surface is connected with the rear cover, and the second mounting surface and the third mounting surface are connected through the curve structure.

[0011] As an optional embodiment, the blade further comprises a curved section for the windward side, the curved section connecting the first mounting surface and the second mounting surface so that the diameter of the blade increases in the direction away from the impeller disc.

[0012] As an optional embodiment, the blade is an arc-shaped plate structure.

[0013] The embodiment of the present application further provides a centrifugal fan comprising the centrifugal impeller as described above.

[0014] The embodiment of the present application has the following beneficial effects:

[0015] The structure of the present application is simple and reasonable, and has the characteristics of noise reduction and efficient airflow delivery. The curved section of the blade, the air inlet guide part, the air outlet guide part and the curved structure and other designs reduce the impact and turbulence of airflow, and the wear of the fan blade and other components is also reduced accordingly, so as to prolong the service life of the equipment and reduce the maintenance cost of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 Fig. 1 is a structural schematic diagram of a centrifugal impeller according to an embodiment of the present application;

[0017] Figure 2 Fig. 2 is an isometric view of the centrifugal impeller according to the embodiment of the present application;

[0018] Figure 3 Fig. 3 is a structural schematic diagram of the centrifugal impeller after removing the front cover according to the embodiment of the present application;

[0019] Figure 4 Fig. 4 is a structural schematic diagram of the blade and the impeller disc connected according to the embodiment of the present application;

[0020] Figure 5 Fig. 5 is a structural schematic diagram of the impeller disc according to the embodiment of the present application;

[0021] Figure 6 Fig. 6 is a structural schematic diagram of the blade according to the embodiment of the present application.

[0022] Wherein,

[0023] 1, front cover; 2, impeller disc; 21, mounting part; 211, air inlet guide part; 212, air outlet guide part; 22, rear cover; 3, blade; 31, air outlet channel; 32, curved structure; 33, first mounting surface; 34, second mounting surface; 35, third mounting surface; 36, curved section. DETAILED DESCRIPTION

[0024] The various schemes and features of the present application are described herein with reference to the accompanying drawings.

[0025] It is to be understood that various modifications can be made to the embodiments described herein. Thus, the description is not to be considered as limiting, but merely as a description of exemplary embodiments. Other modifications, which will become apparent to those skilled in the art, will be encompassed by the scope and spirit of the application.

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0027] These and other characteristics of the present application will become apparent from the following description and the associated drawings, wherein:

[0028] It should also be understood that, although the present application has been described above with reference to particular embodiments, many other equivalents, modifications and variations will become apparent to those skilled in the art in light of the foregoing description.

[0029] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

[0030] Specific embodiments of the present application are described hereinafter; however, it is to be understood that the application is not limited to the particular embodiments described and that the application can be practiced with modification and alteration, and is capable of being practiced otherwise than as specifically described. Accordingly, the specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present application.

[0031] The present application can use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", which can refer to one or more of the same or different embodiments of the application.

[0032] At present, the blades of the impeller of the centrifugal fan are generally straight, which can result in the following problems:

[0033] First, the straight air intake face of the fan blades generates a significant whistling sound due to intense friction with the air during high-speed rotation. This is not only a major source of noise pollution but also negatively impacts the stability of the fan's operation. Second, the presence of the sharp-angled mounting portion 21 at the air inlet obstructs airflow, creating vortices in localized areas. These vortices increase airflow resistance and generate additional noise, further reducing the fan's performance. Third, the sharp angle at the base of the mounting portion 21 also creates vortices in the passing airflow, significantly affecting the fan's airflow output and noise control. Finally, the straight air outlet face of the fan blades also generates a significant whistling sound during high-speed rotation, further exacerbating the noise problem and reducing the fan's operating efficiency.

[0034] In view of the above, an embodiment of this application provides a centrifugal impeller, such as... Figures 1-3 As shown, it includes a front cover 1, a fan disc 2, and multiple blades 3. The front cover 1 has an opening and is a ring structure. The front cover 1 is a component at the front end of the centrifugal impeller and serves to protect and guide airflow.

[0035] The fan blade disk 2 is located on the opposite side of the front cover 1. The middle part of the fan blade disk 2 protrudes towards the front cover 1 to form a mounting part 21. An air inlet is formed between the mounting part 21 and the front cover 1, and an air inlet guide part 211 is formed at the air inlet at this end of the mounting part 21. The mounting part 21 provides a mounting base for the blades 3 and participates in airflow guidance.

[0036] Multiple blades 3 are respectively connected to the front cover 1 and the mounting part 21, and are located between the fan blade disk 2 and the front cover 1. An air outlet channel 31 communicating with the air inlet is formed between two adjacent blades 3. The blades 3 are key components of the centrifugal impeller, which drive the gas flow by rotating.

[0037] The side of the blade 3 away from the mounting part 21 has a curved structure 32, which is used for noise reduction. Specifically, the curved structure 32 plays a key noise reduction role when the blade rotates at high speed. The curved structure 32 can disperse the impact force of the airflow on the edge of the blade, so that the airflow leaves the blade more smoothly, thereby effectively reducing the noise of air cutting.

[0038] When this application is applied, when the centrifugal impeller rotates, the airflow enters from the air inlet, gains kinetic energy under the drive of the blades 3, and is thrown out through the air outlet channel 31 between adjacent blades 3. The curved structure 32 reduces the impact and friction between the airflow and the blades 3 in this process, thereby reducing noise.

[0039] The application effectively reduces the noise of the fan during operation, improves the acoustic performance of the fan by setting the curved structure 32, and reasonably designs the blade 3, the air inlet and the air outlet channel 31 to ensure smooth airflow and improve the working efficiency of the fan.

[0040] In an embodiment, as shown in Figure 2 The rear cover 22 is connected with one end of the mounting part 21 and has a shape matched with that of the front cover 1.

[0041] In the embodiment, the rear cover 22 is part of the fan blade 2, has a shape matched with that of the front cover 1, is connected with one end of the mounting part 21, and plays a role of sealing and protection. When the application is applied, the rear cover 22, the front cover 1 and the mounting part 21 together form the housing of the impeller, which plays a role of restraining and protecting the internal airflow when the impeller rotates, and ensures the airflow to flow in the predetermined channel.

[0042] In an embodiment, as shown in Figures 3-5 The mounting part 21 is a bowl-shaped housing structure, which includes a closed end and an open end. The closed end is arranged concentrically with the front cover 1, and the convex surface of the closed end faces the wind to form the air inlet guide part 211. The closed end and the open end are in an arc shape, and the open end is connected with the rear cover 22 to form the air outlet guide part 212.

[0043] In the embodiment, the mounting part 21 has a shape similar to a bowl and has a closed end and an open end. The air inlet guide part 211 is the convex surface of the closed end, which guides the airflow into the air inlet. The air outlet guide part 212 is the connection part of the open end and the rear cover 22, which guides the airflow to be discharged.

[0044] When the application is applied, the airflow passes through the air inlet and is guided by the air inlet guide part 211 to the inside of the inner impeller, obtains kinetic energy under the action of the blade 3, and is then smoothly discharged from the impeller through the air outlet guide part 212 and the air outlet channel 31.

[0045] The design of the air inlet guide part 211 and the air outlet guide part 212 optimizes the inlet and outlet paths of the airflow, reduces the resistance and turbulence of the airflow, and improves the efficiency and stability of the fan. The bowl-shaped structure of the mounting part 21 also enhances the mechanical strength of the impeller.

[0046] Specifically, the air inlet guide part 211 in the form of a circular arc at the air inlet plays a good airflow guiding role, can guide the air to enter the impeller uniformly and smoothly, and avoids the formation of local vortex at the air inlet. The elimination of vortex means that the noise source caused by airflow turbulence is reduced. Moreover, the air can enter the impeller at a more reasonable angle and speed, the air inlet resistance is reduced, and the air inlet efficiency is improved.

[0047] The air outlet guide part 212 of the circular arc at the air outlet passage 31 precisely guides the air flow out of the impeller, so that the air flow can be stably discharged in a predetermined direction. This avoids the formation of vortex during air outlet, further reducing the generation of noise.

[0048] In an embodiment, as shown in Figure 4 and Figure 6 , the blade 3 comprises a first mounting surface 33, which is shaped to match the arc structure between the closed end and the open end.

[0049] In this embodiment, the first mounting surface 33 is the surface of the blade 3 that matches the arc structure between the closed end and the open end of the mounting part 21, for mounting the blade 3. When the application is applied, the blade 3 is connected to the mounting part 21 through the first mounting surface 33, and when the impeller rotates, the blade 3 works cooperatively with the mounting part 21 to drive the air flow.

[0050] The matching of the first mounting surface 33 of the application and the arc structure of the mounting part 21 makes the blade 3 more firmly mounted, improves the overall stability of the impeller, and helps to improve the working performance of the fan.

[0051] In an embodiment, as shown in Figure 4 and Figure 6 , the blade 3 comprises a second mounting surface 34 and a third mounting surface 35 arranged oppositely, the second mounting surface 34 is connected to the front cover 1, the third mounting surface 35 is connected to the rear cover 22, and the second mounting surface 34 and the third mounting surface 35 are connected through the curved structure 32.

[0052] In this embodiment, the second mounting surface 34 and the third mounting surface 35 are connected to the front cover 1 and the rear cover 22 respectively, and the blade 3 is connected to the front cover 1 and the rear cover 22 through the second mounting surface 34 and the third mounting surface 35 respectively, forming a stable structure, and when the impeller rotates, it drives the air flow together.

[0053] The provision of the second mounting surface 34 and the third mounting surface 35 of the application further enhances the mounting stability of the blade 3, improves the overall structural strength of the impeller, and helps the long-term stable operation of the fan.

[0054] In an embodiment, as shown in Figure 4 and Figure 6 , the blade 3 further comprises an arc-shaped cutting surface 36 for windward, which connects the first mounting surface 33 and the second mounting surface 34, so that the diameter of the blade 3 increases in the direction away from the fan blade disc 2.

[0055] In this embodiment, the arc-shaped section 36 is the part of the blade 3 that is used to face the wind, connecting the first mounting surface 33 and the second mounting surface 34, making the diameter of the blade 3 increase in the direction away from the fan disc 2.

[0056] When the air flow enters the impeller, the arc-shaped section 36 of the blade 3 is first contacted, which guides the air flow to gradually accelerate and change direction, and as the diameter of the blade 3 increases, the air flow obtains more kinetic energy, and then is discharged through the air outlet passage 31.

[0057] The design of the arc-shaped section 36 of the present application optimizes the entry and acceleration process of the air flow, improves the compression and delivery efficiency of the fan, and enables the fan to more effectively handle the air flow and improve overall performance.

[0058] Specifically, the fan blade uses the arc-shaped section 36 as the air inlet facing surface, making the contact process between air and fan blade smoother when the fan blade rotates at high speed. Compared with traditional straight blade fan blades, the arc-shaped section 36 avoids sharp cutting of air, greatly reducing the noise generated by air vibration.

[0059] In an embodiment, as shown in Figure 3 the blade 3 is an arc-shaped plate structure. When the impeller rotates, the arc-shaped plate-shaped blade 3 pushes the air flow to move, and the arc-shaped structure enables the air flow to flow more smoothly between the blades 3, improving the delivery efficiency of the air flow.

[0060] The arc-shaped plate structure of the present application makes the interaction between the blade 3 and the air flow more reasonable, reduces the resistance and energy loss of the air flow, improves the efficiency of the fan, and also helps to reduce noise.

[0061] In summary, when the centrifugal impeller rotates at high speed, air enters from the air inlet, the air inlet guide part 211 (the convex surface of the closed end of the mounting part 21) guides the air to smoothly enter the inside of the impeller. During the rotation of the blade 3, the special structure (such as the arc-shaped section 36, the curved structure 32, etc.) of the blade 3 exerts a force on the air, enabling the air to obtain kinetic energy and pressure energy. The air flows along the air outlet passage 31, the air outlet guide part 212 (the part connecting the open end of the mounting part 21 and the rear cover 22) guides the air to smoothly discharge from the impeller, and finally is delivered to the place where it is needed through the air outlet of the fan.

[0062] The curved structure 32 on the side of the blade 3 away from the mounting part 21 can change the flow mode of the air flow, reduce the friction and impact between the air flow and the blade 3, thereby effectively reducing the noise of the fan during operation, and providing a quieter use environment for the user. The design of the air inlet guide part 211 and the air outlet guide part 212 of the mounting part 21 can guide the air flow to smoothly enter and discharge from the impeller, reduce the resistance and turbulence of the air flow, and improve the efficiency and performance of the fan.

[0063] The blade 3 is connected with the mounting part 21, the front cover 1 and the rear cover 22 through the first mounting surface 33, the second mounting surface 34 and the third mounting surface 35 respectively, which ensures the stability of the blade 3 during high-speed rotation and prolongs the service life of the impeller. The arc-shaped section 36 of the blade 3 is designed to increase the diameter of the blade 3 in the direction away from the fan disc 2, which can better guide the airflow, improve the compression and conveying efficiency of air and reduce energy consumption.

[0064] The centrifugal fan of the embodiment of the application comprises the centrifugal impeller.

[0065] In the embodiment, the centrifugal fan comprises components such as a centrifugal impeller, and is a device for conveying gas by generating centrifugal force through rotation of the impeller. When the application is applied, the motor drives the centrifugal impeller to rotate at high speed, the centrifugal impeller drives the airflow to move, the gas is inhaled and discharged, and the purposes of ventilation and air exchange are achieved.

[0066] The centrifugal fan with the centrifugal impeller designed in the above right item has the advantages of high efficiency, low noise and stability, and can better meet the ventilation needs of different scenes and improve the use performance and user experience of the device.

[0067] In summary, the application is applied as follows:

[0068] 1. Preparation stage

[0069] When the centrifugal fan receives a start instruction, the motor starts to operate, and power is transmitted to the main shaft of the centrifugal impeller through a transmission component (such as a belt pulley or a shaft coupling), driving the entire centrifugal impeller to start high-speed rotation.

[0070] 2. Intake stage

[0071] The mounting part 21 is in the shape of a bowl, and the convex surface of the closed end thereof serves as an air inlet guide part 211 and is arranged to face the wind. Under the action of the suction force generated by high-speed rotation of the centrifugal impeller, external air is guided to the air inlet. The circular arc air inlet guide part 211 at the air inlet further plays a role in accurately guiding the entering air, so that the air can enter uniformly and smoothly, avoiding the formation of local vortexes of air at the air inlet and reducing air intake resistance and noise.

[0072] The arc-shaped section 36 of the fan blade serves as an air inlet windward surface and contacts the entering air. This arc-shaped design makes the contact process of air with the fan blade smoother, avoids the sharp cutting of air by traditional straight-blade fan blades, reduces the breaking sound when the fan blade rotates at high speed, and also enables the air to enter the impeller more smoothly.

[0073] 3. Airflow acceleration and energy conversion stage

[0074] A plurality of blades 3 are installed between the front cover 1 and the mounting portion 21, and an air outlet channel 31 is formed between adjacent blades 3. With the rotation of the centrifugal impeller, the blades 3 exert a force on the incoming air. The blades 3 are arc-shaped plate structures, and their special shape is conducive to guiding air flow, making the air do circular motion under the driving of the blades 3, so as to obtain centrifugal force. Under the action of centrifugal force, the air flows from the center of the impeller to the edge, the speed increases continuously, and the kinetic energy also increases.

[0075] Among them, the first mounting surface 33 of the blade 3 is matched with the arc-shaped structure between the closed end and the open end of the mounting portion 21, which ensures that the blade 3 is tightly connected with the mounting portion 21 and participates in the acceleration process of the air flow together. The second mounting surface 34 is connected with the front cover 1, and the third mounting surface 35 is connected with the rear cover 22, so that the blade 3 is stably fixed in the impeller, and the stability of the structure in the high-speed rotation process is ensured.

[0076] 4. Exhaust stage

[0077] After the air reaches the edge of the impeller under the action of the blade 3, the air outlet guide portion 212 begins to play a role. The circular arc air outlet guide portion 212 is formed by connecting the open end of the mounting portion 21 with the rear cover 22, which guides the outflowing air to make it stable in the predetermined direction, avoids the formation of vortex during the air outlet process, reduces the noise generation, and also improves the air outlet efficiency.

[0078] The curve structure 32 of the outer edge of the fan blade plays a key role in noise reduction when the air is discharged. The curve structure 32 can disperse the impact force of the air flow on the edge of the fan blade, so that the air leaves the fan blade more smoothly, further reducing the breaking noise generated by the high-speed rotation of the fan blade, and ensuring that the discharged air is quiet and stable.

[0079] 5. Continuous circulation

[0080] The centrifugal fan continuously operates, repeatedly the above-mentioned air inlet, air flow acceleration and energy conversion, air exhaust process, continuously absorbs external air source and transports it to the place where it is needed, realizes ventilation, air exchange, pressure increase and other functions, to meet the needs of different scenes. And, the noise of 75dBA generated by the original centrifugal fan fan blade in high-speed rotation can be reduced by 10-15dBA.

[0081] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements shall also be considered to fall within the protection scope of the present application.

Claims

1. A centrifugal impeller, characterized by The centrifugal fan comprises: a front cover having an opening; a fan blade disc arranged on the opposite side of the front cover, the middle part of the fan blade disc is convex towards the front cover to form a mounting part, the mounting part and the opening form an air inlet, and the end of the mounting part forms an air inlet guide part at the air inlet; a plurality of blades connected with the front cover and the mounting part respectively and arranged between the fan blade disc and the front cover, the air outlet channel communicated with the air inlet is formed between two adjacent blades, the side of the blade away from the mounting part is a curved structure for sound attenuation.

2. The centrifugal impeller of claim 1, wherein The fan blade disc further comprises a rear cover, the shape of the rear cover is matched with the shape of the front cover, and the rear cover is connected with one end of the mounting part.

3. The centrifugal impeller of claim 2, wherein The mounting part is a bowl-shaped housing structure, the mounting part comprises a closed end and an open end, the closed end is arranged concentrically with the front cover, the convex surface of the closed end faces the wind to form the air inlet guide part, the closed end and the open end are in an arc structure, and the open end is connected with the rear cover to form an air outlet guide part.

4. The centrifugal impeller of claim 3, wherein The blade comprises a first mounting surface, the shape of the first mounting surface is matched with the arc structure between the closed end and the open end.

5. The centrifugal impeller of claim 4, wherein The blade comprises oppositely arranged second and third mounting surfaces, the second mounting surface is connected with the front cover, the third mounting surface is connected with the rear cover, and the second and third mounting surfaces are connected through the curved structure.

6. The centrifugal impeller of claim 5, wherein The blade further comprises an arc-shaped cutting surface for facing the wind, the arc-shaped cutting surface connects the first and second mounting surfaces to make the diameter of the blade increase in the direction away from the fan blade disc.

7. The centrifugal impeller of claim 1 wherein, The blade is an arc-shaped plate structure.

8. A centrifugal fan characterized by The centrifugal impeller comprises the centrifugal fan as claimed in any one of claims 1-7. The centrifugal fan comprises: a front cover having an opening; a fan blade disc arranged on the opposite side of the front cover, the middle part of the fan blade disc is convex towards the front cover to form a mounting part, the mounting part and the opening form an air inlet, and the end of the mounting part forms an air inlet guide part at the air inlet; a plurality of blades connected with the front cover and the mounting part respectively and arranged between the fan blade disc and the front cover, the air outlet channel communicated with the air inlet is formed between two adjacent blades, the side of the blade away from the mounting part is a curved structure for sound attenuation. The fan blade disc further comprises a rear cover, the shape of the rear cover is matched with the shape of the front cover, and the rear cover is connected with one end of the mounting part. The mounting part is a bowl-shaped housing structure, the mounting part comprises a closed end and an open end, the closed end is arranged concentrically with the front cover, the convex surface of the closed end faces the wind to form the air inlet guide part, the closed end and the open end are in an arc structure, and the open end is connected with the rear cover to form an air outlet guide part. The blade comprises a first mounting surface, the shape of the first mounting surface is matched with the arc structure between the closed end and the open end. The blade comprises oppositely arranged second and third mounting surfaces, the second mounting surface is connected with the front cover, the third mounting surface is connected with the rear cover, and the second and third mounting surfaces are connected through the curved structure. The blade further comprises an arc-shaped cutting surface for facing the wind, the arc-shaped cutting surface connects the first and second mounting surfaces to make the diameter of the blade increase in the direction away from the fan blade disc. The blade is an arc-shaped plate structure. The centrifugal impeller comprises the centrifugal fan as claimed in any one of claims 1-7.

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