Efficient large-flow centrifugal blower

Abstract

The invention discloses an efficient large-flow centrifugal blower. Comprising a motor, a volute mechanism and a rear sealing plate, the motor comprises an outer shell, an inner shell, a rotating mechanism and an impeller, the front end of the outer shell is connected with the volute mechanism, the rear end of the outer shell is connected with the rear sealing plate, the inner shell is arranged in the outer shell, the rotating mechanism is arranged in the inner shell, the two ends of the rotating mechanism are fixed to the inner shell and the rear sealing plate respectively, and the impeller is arranged at the front end of the rotating mechanism and located in the volute mechanism. Main blades are arranged on the outer surface of the impeller in the circumferential direction, gaps between the main blades form airflow channels, each main blade comprises an inlet area, a transition area and an outlet area, the inlet areas, the transition areas and the outlet areas are connected into a whole, the inlet areas are bent in the rotating direction of the impeller to reduce the inlet angle of the air inlet ends of the airflow channels, and the transition areas are of a smooth curve structure. And the outlet area is bent in the reverse direction of the rotation direction of the impeller, the outlet angle of the air outlet end of the airflow channel is increased, and the inlet area, the transition area and the outlet area form a three-section type curvature structure. According to the invention, the airflow conveying efficiency is improved while the large flow is ensured.

Description

Technical Field:

[0001] The present invention belongs to the technical field of blowers, and particularly relates to a high-efficiency large-flow centrifugal blower. Background Art:

[0002] Centrifugal blowers are widely used in scenarios such as gas transportation, pressurization, and circulation. When a centrifugal blower is operating, air flow passes through the impeller. When the air flow rate is large, turbulence will be generated at the outlet of the impeller blades, resulting in unstable air flow, increased dynamic pressure loss of the air flow, and reduced air flow transportation efficiency. How to design a centrifugal blower that can maintain high efficiency while having a large flow rate is a problem that needs to be solved.

[0003] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of implication that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention:

[0004] The purpose of the present invention is to provide a high-efficiency large-flow centrifugal blower, thereby overcoming the defects in the above-mentioned prior art.

[0005] To achieve the above purpose, the present invention provides a high-efficiency large-flow centrifugal blower, including a motor, a volute mechanism, and a rear end plate; the motor includes an outer shell, an inner shell, a rotating mechanism, and an impeller. The front end of the outer shell is connected to the volute mechanism, the rear end of the outer shell is connected to the rear end plate, the inner shell is arranged inside the outer shell, the rotating mechanism is arranged inside the inner shell, both ends of the rotating mechanism are respectively fixed to the inner shell and the rear end plate, the impeller is arranged at the front end of the rotating mechanism, and the impeller is located inside the volute mechanism; main blades are circumferentially arranged on the outer surface of the impeller, and the gaps between the main blades form an air flow channel. The main blades include an inlet area, a transition area, and an outlet area, and the inlet area, the transition area, and the outlet area are connected as a whole. The inlet area is bent in the rotation direction of the impeller to reduce the inlet angle of the air flow channel at the inlet end. The transition area is a smooth curve structure to maintain the stability of the air flow in the middle section of the air flow channel. The outlet area is bent in the opposite direction of the impeller rotation direction to increase the outlet angle of the air flow channel at the outlet end. The inlet area - transition area - outlet area forms a three-stage curvature structure.

[0006] Preferably, in the technical solution, auxiliary vanes are arranged in the air flow channel. The length of the auxiliary vanes is 2 / 3 of that of the main vanes. The auxiliary vanes evenly divide the middle and lower sections of the air flow channel into two narrow flow channels. The auxiliary vanes include an auxiliary inlet area, an auxiliary transition area, and an auxiliary outlet area. The auxiliary inlet area, the auxiliary transition area, and the auxiliary outlet area are connected as a whole. The auxiliary inlet area is bent in the direction of impeller rotation to reduce the inlet angle of the narrow flow channel at the air inlet end. The auxiliary transition area is a smooth curve structure to keep the air flow stable in the middle section of the narrow flow channel. The auxiliary outlet area is bent in the opposite direction of impeller rotation to increase the outlet angle of the narrow flow channel at the air outlet end. The auxiliary inlet area - the auxiliary transition area - the auxiliary outlet area form a three - segment curvature structure.

[0007] Preferably, in the technical solution, the rotating mechanism includes a rotor, a stator, and a main shaft. The stator is fixed in the inner shell. The main shaft passes through the stator. The front and rear parts of the main shaft are respectively fixed on the front end of the inner shell and the rear sealing plate. A rotor is sleeved on the main shaft. The rotor is located in the inner cavity of the stator. The front end of the main shaft extends into the volute mechanism, and an impeller is arranged at the front end of the main shaft.

[0008] Preferably, in the technical solution, the volute mechanism includes a volute, a vortex air passage, and a front sealing plate. The rear end face of the volute is connected to the front end of the outer shell. The front sealing plate is arranged on the front end face of the volute. A vortex air passage is arranged in the volute. The front end of the main shaft extends into the volute. The impeller is located in the vortex air passage, and the impeller structure matches the structure of the vortex air passage.

[0009] Preferably, in the technical solution, the vortex air passage includes a vortex inlet, a connection area, and an inner vortex passage. The inner vortex passage is arranged in the volute and is connected to the volute outlet. The gap between the volute and the front sealing plate forms the connection area. The inner cavity at the center of the volute forms the vortex inlet. The vortex inlet is connected to the inner vortex passage through the connection area. The front end of the main shaft extends into the connection area. The impeller structure is adapted to the structures of the vortex inlet and the connection area. The main vanes and the auxiliary vanes are located in the vortex inlet and the connection area.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] By setting the three - segment vanes, the inlet angle of the flow channel is reduced, the gas kinetic energy is increased when the air flow enters, the air flow velocity and pressure are improved. In the middle of the flow channel, the air flow is stabilized by a smooth curve, the outlet angle of the flow channel is increased, the air flow velocity is reduced, the gas kinetic energy is converted into static pressure, and the air flow dynamic pressure loss is reduced. While ensuring a large flow rate, the air flow transportation efficiency is improved. By setting the auxiliary vanes, the lateral vortex is restricted, the air flow in the flow channel is further stabilized, and the energy loss is reduced. Description of the drawings:

[0012] Figure 1 It is a schematic structural diagram of the high - efficiency large - flow centrifugal blower of the present invention;

[0013] Figure 2Top view of the high-efficiency large-flow centrifugal blower of the present invention;

[0014] Figure 3 is Figure 2 A-A cross-sectional view of;

[0015] Figure 4 Schematic structural diagram of the main shaft impeller of the present invention;

[0016] Figure 5 Front view of the main shaft impeller of the present invention;

[0017] Figure 6 Top view of the main shaft impeller of the present invention. Specific embodiments:

[0018] The following describes in detail the specific embodiments of the present invention, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0019] Unless otherwise clearly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "having" etc. will be understood to include the stated elements or components, without excluding other elements or other components.

[0020] As Figures 1-6 shown, a high-efficiency large-flow centrifugal blower includes a motor 1, a volute mechanism 2, and a rear end plate 3; the motor 1 includes a housing 10, an inner housing 11, a rotating mechanism, and an impeller 12. The front end of the housing 10 is connected to the volute mechanism 2, the rear end of the housing 10 is connected to the rear end plate 3, the inner housing 11 is arranged inside the housing 10, a rotating mechanism is arranged inside the inner housing 11, the rotating mechanism includes a rotor 13, a stator 14, and a main shaft 15. The stator 14 is fixed in the inner housing 11, the main shaft 15 passes through the stator 14, the front and rear parts of the main shaft 15 are respectively fixed to the front end of the inner housing 11 and the rear end plate 3, the rotor 13 is sleeved on the main shaft 15, the rotor 13 is located in the inner cavity of the stator 14, the front end of the main shaft 15 extends into the volute mechanism 2, and the impeller 12 is arranged at the front end of the main shaft 15; the outer surface of the impeller 12 is circumferentially provided with main blades 16, the gaps between the main blades 16 form an air flow channel, the main blades 16 include an inlet area 160, a transition area 161, and an outlet area 162. The inlet area 160, the transition area 161, and the outlet area 162 are connected as a whole. The inlet area 160 is bent in the rotating direction of the impeller 12 to reduce the inlet angle of the air flow channel at the inlet end. The transition area 161 is a smooth curve structure to keep the air flow stable in the middle section of the air flow channel. The outlet area 162 is bent in the opposite direction of the rotating direction of the impeller 12 to increase the outlet angle of the air flow channel at the outlet end. The inlet area 160 - transition area 161 - outlet area 162 forms a three-stage curvature structure.

[0021] An auxiliary blade 17 is arranged in the air flow channel. The length of the auxiliary blade 17 is 2 / 3 of that of the main blade 16. The auxiliary blade 17 evenly divides the middle and lower sections of the air flow channel into two narrow flow channels. The auxiliary blade 17 includes an auxiliary inlet area 170, an auxiliary transition area 171, and an auxiliary outlet area 172. The auxiliary inlet area 170, the auxiliary transition area 171, and the auxiliary outlet area 172 are connected as a whole. The auxiliary inlet area 170 is bent in the rotating direction of the impeller 12 to reduce the inlet angle of the narrow flow channel at the air inlet end. The auxiliary transition area 171 is a smooth curve structure to keep the air flow stable in the middle section of the narrow flow channel. The auxiliary outlet area 172 is bent in the opposite direction of the rotating direction of the impeller 12 to increase the outlet angle of the narrow flow channel at the air outlet end. The auxiliary inlet area 170 - the auxiliary transition area 171 - the auxiliary outlet area 172 form a three-stage curvature structure.

[0022] The volute mechanism 2 includes a volute 20, a vortex air passage 21, and a front seal plate 22. The rear end face of the volute 20 is connected to the front end of the outer shell 10. A front seal plate 22 is arranged on the front end face of the volute 20. A vortex air passage 21 is arranged inside the volute 20. The vortex air passage 21 includes a vortex inlet 23, a connection area 24, and an inner vortex passage 25. The inner vortex passage 25 is arranged inside the volute 20 and is connected to the volute outlet 26. The gap between the volute 20 and the front seal plate 22 forms the connection area 24. The inner cavity at the center of the volute 20 forms the vortex inlet 23. The vortex inlet 23 is connected to the inner vortex passage 25 through the connection area 24. The front end of the main shaft 15 extends to the connection area 24. The structure of the impeller 12 is adapted to the structures of the vortex inlet 23 and the connection area 24. The main blades 16 and the auxiliary blades 17 are located in the vortex inlet 23 and the connection area 24.

[0023] During operation, after the motor 1 is started, the rotor 13 drives the impeller 12 to rotate through the main shaft 15. Gas enters from the air flow channel inlet. Since it enters the smaller air flow channel inlet from the external space, the kinetic energy of the gas is increased, the air flow velocity and pressure are increased. The air flow is stabilized by a smooth curve in the middle of the air flow channel. The air flow is divided into two by the auxiliary blade 17 and enters the narrow flow channels. The outlet of the narrow flow channels gradually increases, reducing the air flow velocity, converting the kinetic energy of the gas into static pressure, and reducing the dynamic pressure loss of the air flow. While ensuring a large flow rate, the air flow transportation efficiency is improved.

[0024] The foregoing description of the specific exemplary embodiments of the present invention is for the purposes of illustration and exemplification. These descriptions are not intended to limit the present invention to the precise forms disclosed, and obviously, many changes and variations are possible in light of the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical applications, so that those skilled in the art can implement and utilize the various different exemplary embodiments of the present invention as well as various different selections and changes. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. An efficient large-flow centrifugal blower, characterized in that: It includes a motor, a volute mechanism, and a rear end plate; the motor includes a housing, an inner housing, a rotating mechanism, and an impeller. The front end of the housing is connected to the volute mechanism, and the rear end of the housing is connected to the rear end plate. An inner housing is arranged inside the housing, a rotating mechanism is arranged inside the inner housing, both ends of the rotating mechanism are respectively fixed on the inner housing and the rear end plate, an impeller is arranged at the front end of the rotating mechanism, and the impeller is located inside the volute mechanism; main blades are circumferentially arranged on the outer surface of the impeller, and the gaps between the main blades form an air flow channel. The main blades include an inlet area, a transition area, and an outlet area, and the inlet area, the transition area, and the outlet area are connected as a whole. The inlet area is bent in the rotating direction of the impeller to reduce the inlet angle of the air flow channel at the inlet end. The transition area is a smooth curve structure to keep the air flow stable in the middle section of the air flow channel. The outlet area is bent in the opposite direction of the rotating direction of the impeller to increase the outlet angle of the air flow channel at the outlet end. The inlet area - transition area - outlet area forms a three - segment curvature structure.

2. The high-efficiency large-flow centrifugal blower according to claim 1, wherein: Auxiliary blades are arranged in the air flow channel. The length of the auxiliary blades is 2 / 3 of that of the main blades. The auxiliary blades evenly divide the middle and lower sections of the air flow channel into two narrow flow channels; the auxiliary blades include an auxiliary inlet area, an auxiliary transition area, and an auxiliary outlet area, and the auxiliary inlet area, the auxiliary transition area, and the auxiliary outlet area are connected as a whole. The auxiliary inlet area is bent in the rotating direction of the impeller to reduce the inlet angle of the narrow flow channel at the inlet end. The auxiliary transition area is a smooth curve structure to keep the air flow stable in the middle section of the narrow flow channel. The auxiliary outlet area is bent in the opposite direction of the rotating direction of the impeller to increase the outlet angle of the narrow flow channel at the outlet end. The auxiliary inlet area - auxiliary transition area - auxiliary outlet area forms a three - segment curvature structure.

3. The high-efficiency large-flow centrifugal blower according to claim 2, characterized in that: The rotating mechanism includes a rotor, a stator, and a main shaft. The stator is fixed in the inner housing, the main shaft passes through the stator, the front part and the rear part of the main shaft are respectively fixed on the front end and the rear end plate of the inner housing, a rotor is sleeved on the main shaft, the rotor is located in the inner cavity of the stator, the front end of the main shaft extends into the volute mechanism, and an impeller is arranged at the front end of the main shaft.

4. The high-efficiency large-flow centrifugal blower according to claim 3, wherein: The volute mechanism includes a volute, a vortex air passage, and a front end plate. The rear end face of the volute is connected to the front end of the housing, a front end plate is arranged on the front end face of the volute, and a vortex air passage is arranged inside the volute; the front end of the main shaft extends into the volute, the impeller is located in the vortex air passage, and the impeller structure matches the vortex air passage structure.

5. The high-efficiency large-flow centrifugal blower according to claim 4, wherein: The vortex air passage includes a vortex inlet, a connection area, and an inner vortex passage. The inner vortex passage is arranged inside the volute and is connected to the volute outlet. The gap between the volute and the front end plate forms the connection area. The inner cavity at the center of the volute forms the vortex inlet, and the vortex inlet is connected to the inner vortex passage through the connection area; the front end of the main shaft extends into the connection area, the impeller structure is adapted to the vortex inlet and the connection area structures, and the main blades and the auxiliary blades are located in the vortex inlet and the connection area.

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