Improved centrifugal impeller with sunken rear plate

Abstract

The invention relates to the technical field of centrifugal impellers, in particular to an improved centrifugal impeller with a sunken rear plate, which comprises a front plate, the rear plate and a plurality of blades arranged between the front plate and the rear plate, the front plate is provided with an air inlet, and air outlet channels are formed among the blades. The position, opposite to the air inlet, of the rear plate is sunken towards the front plate to form a flow guide part, the flow guide part is in a horn shape, and a flow dividing assembly is arranged on the flow guide part. The flow dividing assembly comprises a plurality of flow dividing parts, the flow dividing parts are distributed around the center of the flow dividing part at intervals in a circular array mode to form an airflow channel, the whole flow dividing assembly is in a horn shape, the flow dividing parts coincide with the tip of the flow dividing assembly, and the bending degree of the flow dividing parts is larger than that of the flow dividing parts. Airflow can be more effectively guided, impact of the airflow on the rear plate and the blades is reduced, noise and vibration are reduced, and the aerodynamic efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of centrifugal fans, and in particular to an improved centrifugal impeller with a recessed rear plate. Background Art

[0002] A fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine. Fan is a customary abbreviation for gas compression and gas delivery machinery. The fans usually mentioned include ventilators, blowers, and wind turbines. Fans are widely used in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings for ventilation, dust removal, and cooling.

[0003] Among them, the centrifugal fan mainly includes a centrifugal impeller and a casing. The centrifugal impeller refers to an impeller that takes in air axially and discharges air radially, and uses centrifugal force (determined by the speed and outer diameter) to do work to increase the pressure of the air. A drive motor is set in the casing, and a back plate is fixed on one side of the centrifugal impeller. The output shaft of the drive motor is rotatably connected to the centrifugal impeller. The drive motor is fixedly installed on the side of the back plate away from the centrifugal impeller; by starting the drive motor, the drive motor drives the centrifugal impeller to rotate to achieve gas discharge.

[0004] During the operation of the centrifugal impeller, the airflow often collides with the impeller surface when entering, causing turbulence. As the airflow speed increases, this collision becomes more intense, causing the turbulence to intensify, and the frequency and amplitude of the airflow swing also increase. This frequent and irregular collision increases the internal pressure and friction, which not only accelerates the wear of the impeller, but also increases the noise. Summary of the invention

[0005] In order to reduce the wear and noise of the wind wheel, the present application provides an improved centrifugal impeller with a recessed rear plate.

[0006] The improved rear plate recessed centrifugal impeller provided in the present application adopts the following technical solution: An improved rear plate recessed centrifugal impeller comprises a front plate, a rear plate, and a plurality of blades arranged between the front plate and the rear plate, wherein the front plate is provided with an air inlet, an air outlet channel is formed between the blades, and a position of the rear plate opposite to the air inlet is recessed toward the front plate to form a guide portion, the guide portion is horn-shaped, and a flow diversion component is provided on the guide portion; The diverter assembly includes a plurality of diverter portions, which are spaced apart in a circular array around the center of the guide portion to form an air flow channel. The diverter assembly is trumpet-shaped as a whole, the guide portion and the tip of the diverter assembly overlap, and the curvature of the diverter portion is greater than that of the guide portion.

[0007] By adopting the above technical solution, a diversion assembly is provided on the guide part, which is in the shape of a trumpet as a whole. A part of the airflow flows along the diversion part, and the other part passes through the airflow channel between adjacent diversion parts, and then flows along the guide part, which plays a diversion role on the airflow, reduces the vertical collision between the airflow and the rear plate, and at the same time, the diversion of the gas can reduce the problem of turbulence caused by the collision between the airflows. The tip of the guide part and the diversion assembly overlap, and the curvature of the diversion part is greater than that of the guide part. The direction of the airflow is changed in advance, which can more effectively guide the airflow and reduce the impact of the airflow on the blades, thereby reducing noise and vibration and improving aerodynamic efficiency. At the same time, the drive motor that drives the centrifugal impeller to rotate can be accommodated in the recess of the rear plate, which can reduce the occupied space of the entire centrifugal fan.

[0008] Optionally, the number of the splitters is the same as the number of the blades, and the splitters are opposite to the blades.

[0009] By adopting the above technical solution, the gas is diverted into multiple stages, which reduces the turbulence caused by the collision between air flows, thereby reducing the wear of the centrifugal impeller and reducing noise.

[0010] Optionally, the blade includes a diverter section, an arc section and an extension section, the diverter section is opposite to the diverter portion, and an angle between the diverter section and the extension section is 100°-110°.

[0011] By adopting the above technical solution, the setting of the diverter section reduces the impact of the airflow on the blade, thereby reducing the generation of turbulence. The setting of the arc section helps the smooth transition of the airflow and reduces the friction loss of the airflow on the blade surface, while the extension section further guides the airflow. In addition, the angle between the diverter section and the extension section is set to 100°-110°, which is conducive to reducing the airflow speed and facilitating the pressure surface and suction surface of the blade to work together to generate thrust for the airflow.

[0012] Optionally, the length of the extension section is greater than the length of the diversion section.

[0013] By adopting the above technical solution, the pressure fluctuation of the airflow on the blade surface can be reduced, the noise and vibration generated thereby can be reduced, and the aerodynamic efficiency and stability of the impeller can be improved.

[0014] Optionally, a diverter plate is provided between two adjacent blades, the length of the diverter plate is smaller than the length of the blade, and the diverter plate is arranged corresponding to the outer edge of the blade.

[0015] By adopting the above technical solution, the setting of the diverter plate further diverts the airflow, helps the airflow to transition more smoothly from the diverter section of the blade to the extension section of the blade, reduces the separation of the airflow on the blade surface and the generation of vortices, thereby reducing the pressure fluctuation of the airflow on the blade surface and reducing aerodynamic noise and vibration.

[0016] Optionally, the blade has a suction surface and a pressure surface, and the diverter plate is close to the suction surface.

[0017] By adopting the above technical solution, since the splitter is close to the suction surface, it can effectively guide the airflow, reduce the separation of the airflow near the suction surface and the formation of vortices, thereby reducing the uneven pressure distribution of the airflow on the pressure surface and suction surface of the blade, and reducing the resulting flow loss and noise.

[0018] Optionally, the distance between the diverter plate and the suction surface gradually increases from the center to the edge of the rear plate.

[0019] By adopting the above technical solution, the airflow can flow smoothly, which helps to reduce the pressure fluctuation on the blade surface and the vibration of the blade caused by the pressure difference, thereby reducing the noise and extending the service life of the impeller.

[0020] Optionally, the distance between the diverter plate and the pressure surface gradually increases from the center to the edge of the rear plate.

[0021] It makes the air flow smooth, helps to reduce the pressure fluctuation on the blade surface, reduces the vibration of the blade caused by the pressure difference, thereby reducing the noise and extending the service life of the impeller.

[0022] Optionally, the guide portion is provided with a plurality of grooves arranged at intervals, the plurality of grooves are trumpet-shaped as a whole, and the grooves are arranged one by one opposite to the diverter portion.

[0023] By adopting the above technical solution, the corresponding arrangement of the groove and the diverter portion can enable the airflow to be better guided and rectified before entering the blade, reduce the impact of the airflow on the blade, reduce the vibration and noise generated thereby, and improve the aerodynamic efficiency and stability of the impeller.

[0024] Optionally, the diversion assembly can be detachably mounted on the guide portion.

[0025] By adopting the above technical solution, it can be applied to a variety of scenarios. At the same time, the detachable connection of the diversion component facilitates the cleaning and maintenance of the diversion component and the guide part.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. A guide portion is formed by recessing the rear plate forward at a position opposite to the air inlet, and a diversion component is provided on the guide portion. The overall shape is a trumpet. Part of the airflow flows along the diversion portion, and the other part passes through the airflow channel between adjacent diversion portions and then flows along the guide portion, which has a diversion effect on the airflow and reduces the vertical collision between the airflow and the rear plate. At the same time, the diversion of the gas can reduce the problem of turbulence caused by the collision between the airflows.

[0027] 2. The tips of the guide part and the splitter assembly overlap, and the curvature of the splitter is greater than that of the guide part. Changing the direction of the airflow in advance can guide the airflow more effectively and reduce the impact of the airflow on the blades, thereby reducing noise and vibration and improving aerodynamic efficiency.

[0028] 3. The setting of the diversion section reduces the impact of the airflow on the blades, thereby reducing the generation of turbulence. The setting of the arc section helps the smooth transition of the airflow and reduces the friction loss of the airflow on the blade surface, while the extension section further guides the airflow.

[0029] 4. The angle between the diversion section and the extension section is set to 100°-110°, which is beneficial to reducing the airflow velocity and facilitating the pressure surface and suction surface of the blade to work together to generate thrust for the airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a structural schematic diagram of an improved rear plate recessed centrifugal impeller in an embodiment of the present application; Figure 2 yes Figure 1 Structural schematic diagram of the middle guide part and the diversion part; Figure 3 yes Figure 1 Top view of the middle blade and rear plate.

[0031] Description of reference numerals: 1. front plate; 2. rear plate; 21. guide part; 22. groove; 3. blade; 31. diversion section; 32. arc section; 33. extension section; 34. suction surface; 35. pressure surface; 4. air outlet channel; 5. diversion part; 51. air flow channel; 6. diversion sheet. DETAILED DESCRIPTION

[0032] The following will be combined with the attached Figure 1-3 , the technical solutions in the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] The present application discloses an improved centrifugal impeller with a recessed rear plate. Figure 1 The improved rear plate recessed centrifugal impeller comprises a front plate 1, a rear plate 2, and a plurality of blades 3 arranged between the front plate 1 and the rear plate 2. The front plate 1 is provided with an air inlet, and an air outlet channel 4 is formed between the blades 3. The front plate 1 and the rear plate 2 are connected by the blades 3. When the centrifugal impeller is running, a negative pressure area of ​​air flow is formed inside, and the air flow is quickly sucked into the negative pressure area from the air inlet, and then thrown out from the air outlet channel 4 between the blades 3. The air enters axially and exits radially, and the centrifugal force is used to do work to increase the pressure of the air.

[0035] The position of the rear plate 2 opposite to the air inlet is recessed toward the front plate 1 to form a guide portion 21, which is horn-shaped, and a receiving space is formed on the side of the guide portion 21 facing away from the front plate 1. The output shaft of the drive motor is rotatably connected to the centrifugal impeller, and the drive motor can be located in the receiving space, which can reduce the volume of the entire centrifugal fan.

[0036] By starting the driving motor, the driving motor drives the centrifugal impeller to rotate to realize the gas discharge. When the airflow enters the centrifugal impeller, the guiding part 21 guides the gas, which can avoid the nearly vertical collision between the gas and the rear plate 2.

[0037] Reference Figure 2 A diverter assembly is provided on the guide portion 21, and the diverter assembly includes a plurality of diverters 5. The plurality of diverters 5 are spaced apart in a circular array around the center of the guide portion 21 to form an air flow channel 51. The diverter assembly is trumpet-shaped as a whole, and the tip of the guide portion 21 and the diverter assembly coincide with each other. The curvature of the diverter 5 is greater than that of the guide portion 21.

[0038] When the airflow enters the centrifugal impeller, part of the airflow flows along the splitter 5, and the other part passes through the airflow channel 51 between the adjacent splitters 5, and then flows along the guide 21. On the one hand, it plays a guiding role to reduce the vertical collision between the airflow and the rear plate 2, and on the other hand, it plays a diversion role on the airflow to avoid large-area gathering of airflow, which can reduce the problem of turbulence caused by mutual collision between airflows. The tip of the guide 21 and the splitter assembly overlap, and the curvature of the splitter 5 is greater than that of the guide 21. The direction of the airflow is changed in advance, which can more effectively guide the airflow and reduce the impact of the airflow on the blade 3, thereby reducing noise and vibration and improving aerodynamic efficiency.

[0039] The guide portion 21 is provided with a plurality of grooves 22 arranged at intervals, and the plurality of grooves 22 are horn-shaped as a whole, and the grooves 22 are arranged one by one opposite to the diverter portion 5. The arrangement of the grooves 22 can reduce the collision between airflows, thereby reducing turbulence and noise. The horn-shaped grooves 22 help to evenly distribute the airflow and improve the utilization efficiency of the airflow. In addition, the corresponding arrangement of the grooves 22 and the diverter portion 5 can enable the airflow to obtain better guiding and rectifying effects before entering the blade 3, reduce the impact of the airflow on the blade 3, reduce the vibration and noise generated thereby, and improve the aerodynamic efficiency and stability of the impeller.

[0040] The number of the splitter parts 5 is the same as the number of the blades 3, and the splitter parts 5 are opposite to the blades 3. A part of the gas flows along the guide part 21 from the gap between the adjacent splitter parts 5, and the other part of the gas flows along the splitter parts 5. On the basis of the splitter parts 5 playing a splitting role on the gas, the blades 3 further play a splitting role on it, and the gas is split in multiple stages, which reduces the problem of turbulence caused by collision between airflows, thereby reducing the wear of the centrifugal wind wheel and reducing noise.

[0041] The diverter assembly can be detachably mounted on the guide portion 21 and can be applied to a variety of scenarios. For kitchen ventilation in old houses, it is possible to choose not to install the diverter assembly, reduce the initial investment in maintenance costs, and improve the cost-effectiveness ratio. For commercial kitchens that require ventilation effects, the use of the diverter assembly can significantly improve the quality of the kitchen working environment and reduce the impact on the surrounding environment. At the same time, the detachable connection of the diverter assembly facilitates the cleaning and maintenance of the diverter assembly and the guide portion 21.

[0042] Reference Figure 3 The blade 3 includes a diverter section 31, an arc section 32 and an extension section 33. The diverter section 31 is opposite to the diverter portion 5. The extension direction of the diverter section 31 is the same as the extension direction of the diverter portion 5, so that the airflow can be more smoothly distributed to each part when entering the blade 3, reducing the impact of the airflow on the blade 3, thereby reducing the generation of turbulence. The setting of the arc section 32 helps the smooth transition of the airflow and reduces the friction loss of the airflow on the surface of the blade 3, while the extension section 33 further guides the airflow. The angle between the diverter section 31 and the extension section 33 is 100°-110°, which is conducive to reducing the airflow speed and facilitating the pressure surface 35 of the blade 3 and the suction surface 34 to work together to generate thrust for the airflow.

[0043] The length of the extension section 33 is greater than that of the diverter section 31. The longer extension section 33 can guide the airflow more effectively, reduce the separation of the airflow near the pressure surface 35 of the blade 3, thereby reducing the local velocity of the airflow, enhancing the adhesion of the airflow, and forming a more gentle pressure gradient on the pressure surface 35 of the blade 3. The pressure fluctuation of the airflow on the surface of the blade 3 can be reduced, the noise and vibration generated thereby can be reduced, and the aerodynamic efficiency and stability of the impeller can be improved.

[0044] A flow divider 6 is provided between two adjacent blades 3. The length of the flow divider 6 is less than that of the blade 3. The flow divider 6 is provided corresponding to the outer edge of the blade 3. Since the distance between the two blades 3 gradually increases from the inside to the outside, as the distance increases, the gas is more likely to form turbulence. The provision of the flow divider 6 further diverts the airflow, helps the airflow to transition more smoothly from the diverter section 31 of the blade 3 to the extension section 33 of the blade 3, reduces the separation of the airflow on the surface of the blade 3 and the generation of vortices, thereby reducing the pressure fluctuation of the airflow on the surface of the blade 3, and reducing aerodynamic noise and vibration. The design of the flow divider 6 also helps to control or delay the separation of the airflow, increase the kinetic energy of the boundary layer airflow, and further improve the performance of the impeller.

[0045] The blade 3 has a suction surface 34 and a pressure surface 35. The splitter 6 is close to the suction surface 34 of the blade 3, which helps to optimize the distribution of the airflow between the blades 3. The presence of the splitter 6 can affect the flow characteristics of the airflow, especially near the suction surface 34 of the blade 3. The splitter 6 close to the suction surface 34 can guide the airflow more effectively, reduce the pressure fluctuation of the airflow on the surface of the blade 3, and thus reduce noise and vibration. At the same time, the provision of the splitter 6 helps to reduce the pressure difference between the suction surface 34 and the pressure surface 35 of the blade 3, which can reduce the aerodynamic load fluctuation of the blade 3 caused by the pressure difference, and improve the aerodynamic efficiency and stability of the impeller.

[0046] From the center to the edge of the rear plate 2, the distance between the splitter 6 and the suction surface 34 gradually increases, and the distance between the splitter 6 and the pressure surface 35 gradually increases. This arrangement allows the airflow to flow smoothly, helps reduce pressure fluctuations on the surface of the blade 3, reduces vibrations of the blade 3 caused by pressure differences, and thus reduces noise and extends the service life of the impeller.

[0047] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An improved centrifugal impeller with a recessed rear plate, characterized in that: The invention comprises a front plate (1), a rear plate (2), and a plurality of blades (3) arranged between the front plate (1) and the rear plate (2); the front plate (1) is provided with an air inlet, an air outlet channel (4) is formed between the blades (3), a position of the rear plate (2) opposite to the air inlet is recessed in the direction of the front plate (1) to form a guide portion (21), the guide portion (21) is in the shape of a trumpet, and a flow diversion component is provided on the guide portion (21); The flow splitter assembly comprises a plurality of flow splitters (5), the plurality of flow splitters (5) being spaced apart in a circular array around the center of the flow guide (21) to form an air flow channel (51), the flow splitter assembly as a whole being in the shape of a trumpet, the tip of the flow guide (21) and the flow splitter assembly overlapping, and the curvature of the flow splitter (5) being greater than the curvature of the flow guide (21).

2. The improved centrifugal impeller with a recessed rear plate according to claim 1, characterized in that: The number of the flow splitters (5) is the same as the number of the blades (3), and the flow splitters (5) are opposite to the blades (3).

3. The improved centrifugal impeller with a recessed rear plate according to claim 1, characterized in that: The blade (3) comprises a diverter section (31), an arc section (32) and an extension section (33); the diverter section (31) is opposite to the diverter portion (5); and the angle between the diverter section (31) and the extension section (33) is 100°-110°.

4. The improved centrifugal impeller with a recessed rear plate according to claim 3, characterized in that: The length of the extension section (33) is greater than the length of the diversion section (31).

5. The improved centrifugal impeller with a recessed rear plate according to claim 1, characterized in that: A flow divider (6) is provided between two adjacent blades (3); the length of the flow divider (6) is smaller than the length of the blade (3); and the flow divider (6) is provided corresponding to the outer edge of the blade (3).

6. The improved centrifugal impeller with a recessed rear plate according to claim 5, characterized in that: The blade (3) has a suction surface (34) and a pressure surface (35), and the flow divider (6) is close to the suction surface (34).

7. The improved centrifugal impeller with a recessed rear plate according to claim 6, characterized in that: From the center of the rear plate (2) to the edge, the distance between the diverter plate (6) and the suction surface (34) gradually increases.

8. The improved centrifugal impeller with a recessed rear plate according to claim 6, characterized in that: From the center of the rear plate (2) to the edge, the distance between the diverter plate (6) and the pressure surface (35) gradually increases.

9. The improved centrifugal impeller with a recessed rear plate according to claim 1, characterized in that: The guide portion (21) is provided with a plurality of grooves (22) arranged at intervals, the plurality of grooves (22) are horn-shaped as a whole, and the grooves (22) are arranged one by one opposite to the diverter portion (5).

10. The improved centrifugal impeller with a recessed rear plate according to claim 1, characterized in that: The flow diversion component is detachably mounted on the flow guide portion (21).

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