Double-blade suction and discharge structure of centrifugal fan

Abstract

The application discloses a double-fan-leaf suction-discharge structure of a centrifugal fan, and belongs to the technical field of centrifugal fans. The double-fan-leaf suction-discharge structure comprises an impeller, a volute, an air inlet, an air outlet, a motor, a connecting shaft, a bearing and a flow guide channel. The impeller is designed in a double-fan-leaf mode and comprises centrifugal blades and axial-flow blades. The impeller is located in the interior of the volute, and the interior of the volute is further provided with the flow guide channel. The application has novel design and ingenious device. The double-fan-leaf suction-discharge structure is arranged in the interior of the impeller shell and comprises centrifugal blades and axial-flow blades. The external gas is guided to enter the gap between the centrifugal blades in an orderly manner, the axial air suction capacity is improved, the phenomenon that the air pushed by the centrifugal blades overflows along the axial direction is inhibited, and thus the generation of backflow is reduced. The flow guide channel is arranged, the main channel changes from narrow to wide from the air inlet to the air outlet, the entering gas can be stably transported from the air inlet to the air outlet under the action of the main channel, the gas discharge efficiency is improved, and the discharge capacity is increased.

Description

Technical Field

[0001] This application relates to the field of centrifugal fan technology, and in particular to a double-blade suction and exhaust structure for a centrifugal fan. Background Technology

[0002] Centrifugal fans are machines that rely on input to increase gas pressure and discharge gas. They are a type of driven machine. Centrifugal fans are widely used in factories, mines, vehicles, ships and buildings for ventilation, dust removal and cooling; boilers and industrial furnaces for ventilation and induced draft; household appliances for cooling and ventilation; grain drying and conveying; wind tunnel air source and hovercraft inflation and propulsion, etc.

[0003] Currently, fresh air systems utilize patented fresh air convection technology. Through autonomous air supply and exhaust, indoor air is convected, maximizing indoor air replacement. The fresh air unit has a built-in multi-functional purification system to ensure clean and healthy air entering the room. The centrifugal fan used in the fresh air system converts mechanical energy into kinetic and pressure energy of gas through a high-speed rotating impeller. It consists of an impeller, volute, air inlet and outlet, motor, bearings, and support. During operation, gas enters the center of the impeller from the fan axis. The impeller blades drive the gas to rotate at high speed. Under the action of centrifugal force, the gas is thrown to the outer edge of the impeller, and its kinetic energy and pressure increase significantly. The high-speed gas enters the volute-shaped channel, where its speed decreases, and its kinetic energy is further converted into static pressure energy. The high-pressure gas is discharged through the air outlet, completing the transportation or pressurization process.

[0004] However, most existing fresh air systems use a single-blade impeller design in their centrifugal fans, resulting in low efficiency and a need to improve air volume.

[0005] Therefore, this application proposes a double-blade suction and exhaust structure for a centrifugal fan. Utility Model Content

[0006] This application proposes a double-blade suction and exhaust structure for a centrifugal fan to solve the problems mentioned in the background art. By setting a double-blade suction and exhaust structure inside the impeller housing, which includes centrifugal blades and axial flow blades respectively, the external gas is guided to enter the gap between the centrifugal blades in an orderly manner, thereby improving the axial suction capacity and suppressing the phenomenon of air pushed by the centrifugal blades overflowing along the axial direction, thus reducing the generation of backflow and greatly improving the practicality of the device.

[0007] To achieve the above objectives, this application adopts the following technical solution:

[0008] A centrifugal fan with a double-blade suction and exhaust structure includes an impeller, a volute, an air inlet, an air outlet, a motor, a connecting shaft, bearings, and a flow guide channel. The impeller has a double-blade design, including centrifugal blades and axial flow blades. The impeller is located inside the volute, and the volute also has a flow guide channel inside.

[0009] In a preferred embodiment, both the centrifugal blades and the axial flow blades are fixedly connected to the connecting shaft, wherein the centrifugal blades and the axial flow blades are staggered.

[0010] By setting a double-bladed suction and exhaust structure inside the impeller housing, including centrifugal blades and axial blades respectively, the external gas is guided into the gap between the centrifugal blades in an orderly manner, which improves the axial suction capacity and also suppresses the phenomenon of air pushed by the centrifugal blades overflowing along the axis, reducing the generation of backflow, thereby improving the practicality of the device.

[0011] In a preferred embodiment, the flow guiding channel includes a main channel and an auxiliary channel, which are respectively disposed on the inner wall AB of the volute. There are a total of six main channels on the AB surface and a total of four auxiliary channels on the AB surface.

[0012] By setting up a flow guide channel, the main channel widens from the air inlet to the air outlet, which allows the incoming gas to be stably transported from the air inlet to the air outlet under the action of the main channel, thereby improving the gas emission efficiency and increasing the emission volume. The auxiliary channel can accelerate the emission speed of the incoming gas and improve the timely discharge of the air at the inner edge of the volute, thereby improving the practicality of the device.

[0013] In a preferred embodiment, the volute is provided with an air inlet and an air outlet is provided on the side away from the air inlet;

[0014] By opening an air inlet and an air outlet on the volute, the air inlet is used to drive the gas through the impeller to the air outlet, thereby improving the practicality of the device.

[0015] In a preferred embodiment, a bracket is fixedly connected inside the volute, a motor is fixedly connected to the bracket, and one end of the connecting shaft is fixedly connected to the output end of the motor.

[0016] By installing a bracket inside the volute, which is used to fix the motor, the motor is fixed inside the volute and provides driving force, thereby improving the practicality of the device.

[0017] In a preferred embodiment, a bearing is provided inside the volute, and the end of the connecting shaft away from the motor is fixedly connected to the bearing;

[0018] The motor starts to rotate when the bracket rotates, and the double fan blades are driven to rotate through the connecting shaft, thereby improving the practicality of the device.

[0019] The beneficial effects of this application are:

[0020] 1. The double-blade suction and discharge structure of the centrifugal fan, by setting a double-blade suction and discharge structure inside the impeller housing, including centrifugal blades and axial flow blades respectively, guides the external gas into the gap between the centrifugal blades in an orderly manner, improves the axial suction capacity, and also suppresses the phenomenon of air pushed by the centrifugal blades overflowing along the axis, thereby reducing the generation of backflow and greatly improving the practicality of the device.

[0021] 2. The double-blade suction and discharge structure of this centrifugal fan, by setting a flow guide channel, the main channel widens from the air inlet to the air outlet, which enables the incoming gas to be stably transported from the air inlet to the air outlet under the action of the main channel, thereby improving the gas discharge efficiency and increasing the discharge volume. The auxiliary channel can accelerate the discharge speed of the incoming gas and improve the timely discharge of the air at the inner edge of the volute, greatly improving the practicality of the device. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of the device in this application;

[0023] Figure 2 This is a top view of the internal structure of the device described in this application;

[0024] Figure 3 This is a cross-sectional view of the volute casing of the device in this application.

[0025] Figure 4 This is a schematic diagram of the impeller of the device in this application.

[0026] The following are the labels in the diagram: 1. Impeller; 11. Centrifugal blade; 12. Axial blade; 2. Volute; 3. Air inlet; 4. Air outlet; 5. Support; 6. Motor; 7. Connecting shaft; 8. Bearing; 9. Guide channel; 91. Main channel; 92. Auxiliary channel. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0028] Reference Figure 1-4A centrifugal fan with a double-blade intake and exhaust structure includes an impeller 1, a volute 2, an air inlet 3, an air outlet 4, a motor 6, a connecting shaft 7, a bearing 8, and a guide channel 9. The impeller 1 has a double-blade design, including centrifugal blades 11 and axial blades 12. The impeller 1 is located inside the volute 2, which also has a guide channel 9 inside. An external rotor motor is located on the inner side of one side of the impeller. The external rotor motor includes a rotor magnetic ring and a stator. The rotor magnetic ring is fixedly connected to the inner ring on one side of the impeller, while the stator is movably connected to the inner side of the rotor magnetic ring via a magnetic levitation air gap connection. The air gap between the two is 0.2-2 mm. In this embodiment, the internal core of the stator can be a twelve-slot ten-pole or twelve-slot fourteen-pole structure.

[0029] Reference Figure 2 , 4 Both the centrifugal blade 11 and the axial blade 12 are fixedly connected to the connecting shaft 7, wherein the centrifugal blade 11 and the axial blade 12 are staggered. By setting a double-bladed suction and exhaust structure inside the impeller 1 housing, which includes centrifugal blade 11 and axial blade 12 respectively, the external gas is guided to enter the gap between the centrifugal blades in an orderly manner, which improves the axial suction capacity and also suppresses the phenomenon of the wind pushed by the centrifugal blades overflowing along the axis, reducing the generation of backflow, thereby improving the practicality of the device.

[0030] Reference Figure 1-3 The flow guiding channel 9 includes a main channel 91 and an auxiliary channel 92. The flow guiding channels 9 are respectively set on the inner wall AB of the volute 2. There are a total of six main channels 91 on the AB surface and a total of four auxiliary channels 92 on the AB surface. By setting the flow guiding channels 9, the main channel 91 widens from the air inlet 3 to the air outlet 4, which enables the incoming gas to be stably transported from the air inlet 3 to the air outlet 4 under the action of the main channel 91, thereby improving the gas emission efficiency and increasing the emission volume. The auxiliary channel 92 enables the incoming gas to accelerate the emission speed and improve the timely discharge of the air at the inner edge of the volute 2, thereby improving the practicality of the device.

[0031] Reference Figure 1-4 An air inlet 3 is provided on the volute 2, and an air outlet 4 is provided on the side away from the air inlet 3. By providing an air inlet 3 and an air outlet 4 on the volute 2, the air inlet 3 is used to drive the gas through the impeller 1 to the air outlet 4, thereby improving the practicality of the device.

[0032] Reference Figure 1-4 A bracket 5 is fixedly connected inside the volute 2, and a motor 6 is fixedly connected to the bracket 5. One end of the connecting shaft 7 is fixedly connected to the output end of the motor 6. By installing the bracket 5 inside the volute 2, the motor 6 is fixedly connected inside the volute 2, providing driving force and thus improving the practicality of the device.

[0033] Reference Figure 1-4 The volute 2 has a bearing 8 inside, and the end of the connecting shaft 7 away from the motor 6 is fixedly connected to the bearing 8. By driving the motor 6, the motor 6 starts to rotate. When the bracket 5 rotates, it will drive the double fan blades to rotate through the connecting shaft 7, thereby improving the practicality of the device.

[0034] Working principle: During operation, gas enters the center of impeller 1 axially through inlet 3. The blades of impeller 1 drive the gas to rotate at high speed. Under the action of centrifugal force, the gas is thrown towards the outer edge of impeller 1, significantly increasing its kinetic energy and pressure. The high-speed gas enters the volute 2-shaped channel, where its speed decreases, and its kinetic energy is further converted into static pressure energy. The high-pressure gas is discharged through outlet 4, completing the conveying or pressurization process. By setting a double-bladed suction and discharge structure inside the impeller 1 housing, including centrifugal blades 11 and axial blades 12, the external gas is guided to enter the gap between the centrifugal blades in an orderly manner, improving the efficiency of the pump. The axial suction capability also suppresses the phenomenon of air overflow along the axial direction pushed by the centrifugal blades, thereby reducing the generation of backflow. This allows the fan to overcome resistance more effectively and significantly increase the air volume. By setting the guide channel 9, the main channel 91 widens from the air inlet 3 to the air outlet 4, which enables the incoming gas to be stably transported from the air inlet 3 to the air outlet 4 under the action of the main channel 91, thereby improving the gas emission efficiency and increasing the emission volume. The auxiliary channel 92 can accelerate the emission speed of the incoming gas and improve the timely discharge of the air at the inner edge of the volute 2.

[0035] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and the inventive concept of this application, should be included within the scope of protection of this application.

Claims

1. A double-blade suction and exhaust structure for a centrifugal fan, comprising an impeller (1), a volute (2), an air inlet (3), an air outlet (4), a motor (6), a connecting shaft (7), a bearing (8), and a guide channel (9), characterized in that, The impeller (1) has a double-blade design, including centrifugal blades (11) and axial blades (12). The impeller (1) is located inside the volute (2), and the volute (2) is also provided with a flow guide channel (9).

2. The double-blade suction and exhaust structure of a centrifugal fan according to claim 1, characterized in that, Both the centrifugal blade (11) and the axial flow blade (12) are fixedly connected to the connecting shaft (7), wherein the centrifugal blade (11) and the axial flow blade (12) are staggered.

3. The double-blade suction and discharge structure of a centrifugal fan according to claim 1, characterized in that, The flow channel (9) includes a main channel (91) and an auxiliary channel (92). The flow channels (9) are respectively set on the inner wall AB of the volute (2). There are a total of six main channels (91) on the AB surface and a total of four auxiliary channels (92) on the AB surface.

4. The double-blade suction and exhaust structure of a centrifugal fan according to claim 1, characterized in that, An air inlet (3) is provided on the volute (2), and an air outlet (4) is provided on the side away from the air inlet (3).

5. The double-blade suction and discharge structure of a centrifugal fan according to claim 1, characterized in that, The volute (2) is fixedly connected to a bracket (5), and a motor (6) is fixedly connected to the bracket (5). One end of the connecting shaft (7) is fixedly connected to the output end of the motor (6).

6. The double-blade suction and exhaust structure of a centrifugal fan according to claim 1, characterized in that, The volute (2) is equipped with a bearing (8), and the end of the connecting shaft (7) away from the motor (6) is fixedly connected to the bearing (8).

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