An airfoil centrifugal fan for regenerative air road sweepers

Abstract

This utility model provides an airfoil centrifugal fan for a regenerative air-type road sweeper, belonging to the field of centrifugal fans. It includes a volute housing, inside which an impeller assembly is installed, and the impeller assembly is driven by a motor. An air inlet is located in the middle of one of the bottom plates of the volute housing. An air outlet channel is located at the lower part of the volute housing, with an air outlet at its lower end. A pressure relief device is installed on the side wall of the air outlet channel. The beneficial effect of this utility model is that the airflow blown out at the air outlet can be adjusted by adjusting the pressure relief device, thereby ensuring that the airflow blown out from the suction nozzle can meet the cleaning needs of corresponding roads under different seasons and working conditions, thus improving the overall cleaning effect.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal fans, specifically relating to an airfoil centrifugal fan for a regenerated air type road sweeper. Background Technology

[0002] In urban environmental sanitation maintenance, road sweepers play a crucial role, and their work efficiency and cleaning quality directly affect the cleanliness of the city and the living environment of residents. As the core component of a road sweeper, the centrifugal fan is responsible for generating negative pressure suction to draw road debris and dust into the collection device; its performance has a decisive impact on the sweeper's working effect.

[0003] Currently, most centrifugal fans used in road sweepers on the market operate by directly venting air into the atmosphere. Therefore, road sweepers operating under this mode have the following problems in actual operation: during the entire road sweeping process, a large amount of dynamic pressure is discharged with the airflow, resulting in significant power loss.

[0004] To address these issues, some existing road sweepers have begun to adopt a regenerated air operating mode. This mode involves guiding regenerated airflow from a centrifugal fan into a lower suction nozzle to sweep up road debris. However, due to varying road conditions in different seasons and scenarios, existing road sweepers using centrifugal fans often lack a pressure relief device when cleaning different types and distributions of debris. This can lead to insufficient airflow to meet the cleaning requirements, resulting in some debris not being effectively sucked in and thus reducing cleaning efficiency. Utility Model Content

[0005] The technical problem solved by this utility model is to provide an airfoil centrifugal fan for a regenerative air-type road sweeper, and to enable it to effectively adjust the speed of the blown airflow to meet the sweeping needs of the road sweeper under different seasons and sweeping conditions.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: an airfoil centrifugal fan for a regenerative air-type road sweeper, comprising a volute, an impeller assembly inside the volute, and a drive motor connected to the impeller assembly; an air inlet is provided in the middle of one of the bottom plates of the volute; an air outlet channel is provided in the lower part of the volute, an air outlet is provided at the lower end of the air outlet channel, and a pressure relief device is provided on the side wall of the air outlet channel. The air volume blown out at the air outlet can be adjusted by adjusting the pressure relief device, that is, adjusting the air volume entering the suction nozzle connected to the air outlet, thereby ensuring that the airflow blown out at the suction nozzle can meet the cleaning needs of the corresponding road, such as preventing light materials such as leaves in front of the suction nozzle from being blown out by the high-speed airflow behind.

[0007] Furthermore, the pressure relief device includes a pressure relief window opened on the side wall of the air outlet duct, and a pressure relief mechanism is hinged to the lower end of the pressure relief window. The pressure relief mechanism is driven by a drive mechanism. The drive mechanism can control the pressure relief mechanism to be parallel to the side wall of the air outlet duct where the pressure relief window is located and to seal the pressure relief window. The drive mechanism can also control the included angle between the pressure relief mechanism and the side wall of the air outlet duct where the pressure relief window is located to be less than 90° or equal to 90°, so as to close or open the pressure relief window.

[0008] Furthermore, the pressure relief mechanism is provided with an actuating part, a hinge part, and an action part in sequence from top to bottom. The actuating part can seal the pressure relief window, the hinge part is hinged to the lower end of the pressure relief window, and the action part is connected to the drive mechanism. The drive mechanism preferably adopts a telescopic structure such as an electric actuator. At this time, the end of the drive mechanism is hinged to the action part, and the extension and retraction of the drive mechanism controls the rotation of the pressure relief mechanism around the hinge axis between the hinge part and the pressure relief window to open or close the pressure relief window.

[0009] Furthermore, the impeller assembly includes two parallel impeller base plates, with airfoil blades installed between the two impeller base plates. One impeller base plate has an air inlet in the middle, which is opposite to and connected to the air inlet interface. The other impeller base plate is fixedly connected to the output shaft of the drive motor, and can drive the entire impeller assembly to rotate under the action of the drive motor.

[0010] Furthermore, the airfoil blade includes an upper airfoil and a lower airfoil. One end of the upper airfoil and one end of the lower airfoil are welded together on a pin, which is mounted on the impeller base plate. The other ends of the upper airfoil and the other ends of the lower airfoil are welded together to form the entire airfoil blade. Moreover, the upper airfoil and the lower airfoil can be processed by bending or simple molding, thereby simplifying the entire blade manufacturing process.

[0011] Furthermore, the impeller base plate has positioning holes and blade contour lines on the side near the airfoil blade. The positioning holes correspond to the pins of the airfoil blade, and the blade contour lines fit the contour of the airfoil blade. This way, after the airfoil blade is made, it can be welded according to the positioning information, thereby ensuring the accuracy of the impeller assembly.

[0012] Furthermore, the airfoil blade has an angle of attack of 9-12° and an exit angle of 26°. By optimizing the design of the airfoil blade angle, the system efficiency can reach over 70% during wind turbine operation.

[0013] Furthermore, the air outlet direction of the volute's tongue is 10° to prevent airflow from generating eddies at the air outlet channel.

[0014] Furthermore, the inner wall of the volute is provided with a rubber lining or a polyurethane lining to improve the wear resistance and service life of the fan.

[0015] Furthermore, the end face of the air inlet that is away from the volute is an inclined end face, with the upper end of the inclined end face tilted towards the direction closer to the volute. This allows the cargo box and the fan to be pressed together under their own weight, increasing the sealing performance of the system. That is, when it is connected to the air outlet of other equipment on the road sweeper, it can be fitted with an inclined surface and a rubber gasket. At this time, the rubber gasket can be compressed under the action of gravity, thereby ensuring the airtightness of the entire system.

[0016] As can be seen from the above technical solutions, this utility model has the following beneficial effects. First, it can effectively adjust the speed and volume of the blown airflow to adapt to the cleaning environment of the road sweeper, such as preventing light materials such as leaves in front of the suction nozzle from being blown out by the high-speed airflow behind. Second, by optimizing the design of parameters such as the shape and angle of the airfoil blades and the air outlet direction of the volute tongue, it can make the system efficiency of the fan reach more than 70% during operation. At the same time, it can also reduce the manufacturing difficulty of the entire fan and improve the overall production efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 An overall structural diagram of an airfoil centrifugal fan for a regenerative air road sweeper provided by this utility model;

[0019] Figure 2 This is a schematic diagram of the impeller assembly in this utility model;

[0020] Figure 3 This is a schematic diagram of the arrangement of the impeller assembly in this utility model. Figure 1 ;

[0021] Figure 4 This is a schematic diagram of the arrangement of the impeller assembly in this utility model. Figure 2 ;

[0022] Figure 5 This is a schematic diagram of the impeller base plate in this utility model;

[0023] Figure 6 This is a schematic diagram of the airfoil blade in this utility model.

[0024] In the diagram: 1. Base plate; 2. Air inlet; 3. Inclined end face; 4. Air outlet channel; 5. Air outlet; 6. Actuating part; 7. Hinge part; 8. Actuating part; 9. Pressure relief mechanism; 10. Pressure relief window; 11. Drive mechanism; 12. Pressure relief device; 13. Drive motor; 14. Volute; 15. Impeller base plate; 16. Airfoil blade; 17. Positioning hole; 18. Air inlet; 19. Upper blade; 20. Pin; 21. Lower blade; 22. Blade profile line; α. Vortex outlet angle; β. Airfoil blade outlet angle. Detailed Implementation

[0025] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0026] like Figures 1 to 6 As shown, this utility model provides an airfoil centrifugal fan for a regenerative air type road sweeper, which includes a volute 14. An air inlet 2 is provided in the middle of one of the bottom plates 1 of the volute 14. The air inlet 2 is used to connect to the air outlet of the equipment located upstream of the centrifugal fan on the road sweeper. The end face of the air inlet 2 away from the volute 14 is preferably set as an inclined end face 3, and the upper end of the inclined end face 3 is inclined towards the direction close to the volute 14. In this way, when it is connected to the air outlet of other equipment on the road sweeper, it can be fitted by using an inclined surface and a rubber gasket. At this time, the rubber gasket will be compressed under the action of gravity, thereby ensuring the airtightness of the entire system.

[0027] A drive motor 13 is disposed in the middle of another base plate 1 of the volute 14. The drive motor 13 is used to drive the impeller assembly located inside the volute 14 to rotate, and the drive motor 13 is preferably a permanent magnet synchronous motor. Specifically, in this embodiment, as... Figure 2As shown, the impeller assembly includes two parallel impeller base plates 15, which are parallel to the two base plates 1 of the volute 14. One of the impeller base plates 15 is fixedly connected to the output shaft of the drive motor 13, and can drive the entire impeller assembly to rotate under the action of the drive motor 13. Nine airfoil blades 16 are evenly installed circumferentially between the two impeller base plates 15. The airfoil blade 16 includes an upper airfoil 19 and a lower airfoil 21. One end of the upper airfoil 19 and one end of the lower airfoil 21 are welded together with a pin 20, which is used to install the upper airfoil 19 on the two impeller base plates 15. The other ends of the upper airfoil 19 and the lower airfoil 21 are welded together to form the entire airfoil blade 16. The upper airfoil 19 and the lower airfoil 21 can be processed by bending or simple molding, thereby simplifying the manufacturing process of the entire airfoil blade 16. Meanwhile, in order to ensure that the operators can accurately install the nine airfoil blades 16 on the impeller base plate 15, this utility model can also use drilling equipment or laser equipment to set positioning holes 17 and blade contour lines 22 on the side of the impeller base plate 15 near the airfoil blades 16, and make the positioning holes 17 correspond to the pins 20 of the airfoil blades 16, and the blade contour lines 22 fit the contour of the airfoil blades 16. In this way, after the airfoil blades 16 are made, they can be welded according to the positioning information, thereby ensuring the accuracy of the impeller assembly.

[0028] In addition, to improve the performance of the fan, the present invention can also set the air outlet direction of the volute tongue of the volute 14 to 10° to prevent the airflow from generating vortices at the fan outlet; set the angle of attack of the airfoil blade 16 to 9-12° and the outlet angle of the airfoil blade 16 to 26°; and make the air inlet 2 and the air inlet 18 set on the impeller base plate 15 in the impeller assembly use a planar fit to reduce the vortices generated at the inlet.

[0029] In addition, this invention provides a rubber liner or a polyurethane liner on the inner wall of the volute 14 to provide wear resistance. An air outlet duct 4 is provided at the lower part of the volute 14, and an air outlet interface 5 is provided at the lower end of the air outlet duct 4. This air outlet interface 5 connects to the suction nozzle of the road sweeper used for cleaning road debris, allowing airflow to be blown into the suction nozzle for cleaning. Furthermore, to meet the operating conditions of the road sweeper using regenerative airflow technology, this invention also provides a pressure relief device 12 on the side wall of the air outlet duct 4.

[0030] The pressure relief device 12 includes a pressure relief window 10 on the side wall of the air outlet duct 4. A pressure relief mechanism 9 is provided at the pressure relief window 10. The pressure relief mechanism 9 is provided with an actuating part 8, a hinge part 7, and an action part 6 from top to bottom. The actuating part 8 can seal the pressure relief window 10. The hinge part 7 is hinged to the lower end of the pressure relief window 10. The action part 6 is connected to the driving mechanism 11. The driving mechanism 11 can control the actuating part 8 of the pressure relief mechanism 9 to be parallel to the side wall of the air outlet duct where the pressure relief window 10 is provided and seal the pressure relief window 10 to close the pressure relief window 10. It can also control the included angle between the pressure relief mechanism 9 and the side wall of the air outlet duct where the pressure relief window 10 is provided to be less than 90° or equal to 90° to open the pressure relief window 10. Furthermore, when the drive mechanism 11 adopts a telescopic structure such as an electric actuator, one end of the drive mechanism 11 can be hinged to the volute 14, and the other end of the drive mechanism 11 can be hinged to the action part 6. The extension and retraction of the drive mechanism 11 can control the pressure relief mechanism 9 to rotate around the hinge axis between the hinge part 7 and the pressure relief window 10, so as to open or close the pressure relief window 10.

[0031] In this way, the present invention can adjust the air volume blown out at the air outlet 5 by adjusting the pressure relief device 12, that is, adjust the air volume entering the suction nozzle connected to the air outlet 5, thereby ensuring that the airflow blown out at the suction nozzle can meet the cleaning needs of the corresponding roads under different seasons and working conditions, such as preventing light materials such as leaves in front of the suction nozzle from being blown out by the high-speed airflow behind.

[0032] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A centrifugal fan for a regenerative air-type road sweeper, comprising a volute (14), an impeller assembly disposed inside the volute (14), the impeller assembly being driven by a drive motor (13); an air inlet (2) is disposed in the middle of one of the base plates (1) of the volute (14); characterized in that, The lower part of the volute (14) is provided with an air outlet channel (4), the lower end of the air outlet channel (4) is provided with an air outlet interface (5), and the side wall of the air outlet channel (4) is provided with a pressure relief device (12).

2. The airfoil centrifugal fan for a regenerative air road sweeper according to claim 1, characterized in that, The pressure relief device (12) includes a pressure relief window (10) opened on the side wall of the air outlet channel (4). The lower end of the pressure relief window (10) is hinged to a pressure relief mechanism (9). The pressure relief mechanism (9) is driven by a drive mechanism (11). The drive mechanism (11) can control the pressure relief mechanism (9) to be parallel to the side wall of the air outlet channel (4) where the pressure relief window (10) is provided and seal the pressure relief window (10). The drive mechanism (11) can also control the included angle between the pressure relief mechanism (9) and the side wall of the air outlet channel (4) where the pressure relief window (10) is provided to be less than 90° or equal to 90°.

3. The airfoil centrifugal fan for a regenerative air road sweeper according to claim 2, characterized in that, The pressure relief mechanism (9) is provided with an actuating part (8), a hinge part (7), and an action part (6) from top to bottom. The actuating part (8) can seal the pressure relief window (10). The hinge part (7) is hinged to the lower end of the pressure relief window (10). The action part (6) is connected to the drive mechanism (11) for transmission.

4. The airfoil centrifugal fan for a regenerative air road sweeper according to claim 1, characterized in that, The impeller assembly includes two parallel impeller base plates (15), with airfoil blades (16) installed between the two impeller base plates (15). One of the impeller base plates (15) has an air inlet (18) in the middle, which is opposite to and connected to the air inlet interface (2). The other impeller base plate (15) is fixedly connected to the output shaft of the drive motor (13).

5. The airfoil centrifugal fan for a regenerative air road sweeper according to claim 4, characterized in that, The airfoil blade (16) includes an upper airfoil (19) and a lower airfoil (21). One end of the upper airfoil (19) and one end of the lower airfoil (21) are welded together on a pin (20), which is mounted on the impeller base plate (15). The other end of the upper airfoil (19) and the other end of the lower airfoil (21) are welded together.

6. The airfoil centrifugal fan for a regenerative air road sweeper according to claim 5, characterized in that, The impeller base plate (15) has a positioning hole (17) and a blade outline (22) on the side near the airfoil (16). The positioning hole (17) corresponds to the pin (20) of the airfoil (16), and the blade outline (22) fits the outline of the airfoil (16).

7. The airfoil centrifugal fan for a regenerative air road sweeper according to claim 4, characterized in that, The angle of attack of the airfoil (16) is 9-12°, and the exit angle of the airfoil (16) is 26°.

8. The airfoil centrifugal fan for a regenerative air road sweeper according to claim 1, characterized in that, The air outlet direction of the volute tongue of the volute (14) is 10°.

9. The airfoil centrifugal fan for a regenerative air road sweeper according to claim 1, characterized in that, The inner wall of the volute (14) is provided with a rubber liner or a polyurethane liner.

10. The airfoil centrifugal fan for a regenerative air road sweeper according to claim 1, characterized in that, The end face of the air inlet (2) that is away from the volute (14) is an inclined end face (3), and the upper end of the inclined end face (3) is inclined toward the direction close to the volute (14).

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