Flow guide cover assembly, centrifugal fan, sanitation vehicle pneumatic system and sanitation vehicle

Abstract

The air guide sleeve assembly comprises a machine shell assembly, an impeller, the air guide sleeve assembly, an air inlet chamber and a shaft system assembly, the impeller is arranged in the machine shell assembly, the shaft system assembly is installed on one side of the machine shell assembly and used for being connected with the impeller and a driving source, and the air inlet chamber is arranged in the machine shell assembly. The flow guide cover assembly is installed on the other side of the machine shell assembly and used for being connected with the air inlet chamber and the machine shell assembly. According to the flow guide cover assembly, the centrifugal fan, the sanitation truck pneumatic system and the sanitation truck, the wind blocking ring is arranged between the circular cover and the flow collector, the area formed between the circular cover and the flow collector can be separated from a flow field in a machine shell, and therefore flow loss is avoided in the space between the circular cover and the flow collector; the axis of the air inlet chamber obliquely intersects with the axis of the flow guide cover assembly, and the included angle is an acute angle, so that the flow loss during airflow steering can be reduced, and the fan efficiency and the absolute value of inlet total pressure are improved.

Description

[0001] This application is a divisional application. The original application number is 202310783957.7, the application date is June 29, 2023, and the invention title is: A high-efficiency, low-noise centrifugal fan for a sanitation vehicle pneumatic system. Technical Field

[0002] This invention relates to a deflector assembly, a centrifugal fan, a pneumatic system for sanitation vehicles, and a sanitation vehicle, belonging to the field of centrifugal fan technology. Background Technology

[0003] Sweeping sanitation vehicles use pneumatic systems to perform suction during sweeping operations. The centrifugal fan, as a core component of this system, has a crucial impact on the overall vehicle performance due to its inlet total pressure. The fan's efficiency and noise level also affect the vehicle's performance. Ideally, centrifugal fans should have axial air intake. However, in practical applications on sanitation vehicles, a common method is to connect a duct network to the air intake chamber, allowing gas to flow through the collector and into the impeller. During the transition from radial to axial airflow within the air intake chamber, significant vortex losses occur, reducing fan efficiency. Furthermore, sanitation vehicles typically require high pressure and have compact layouts; therefore, the fans used usually fall into two categories: Figure 6 As shown. Common solution 1 is to reduce the width of the casing and use an arc-shaped cover plate. This solution occupies less space, but the processing cost of the arc-shaped cover plate is increased. Common solution 2 is to use a wide casing and a flat cover plate. The cover plate completely accommodates the impeller in the casing cavity. This solution is simple to process, but it occupies more space and the gap between the impeller front plate and the cover plate is large, which makes it more prone to eddy current losses. It is evident that, in order to avoid the generation of eddy current losses, there is an urgent need for a fairing assembly, a centrifugal fan, a pneumatic system for sanitation vehicles, and sanitation vehicles. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a deflector assembly, a centrifugal fan, a pneumatic system for a sanitation vehicle, and a sanitation vehicle. By setting a baffle ring between the circular shroud and the collector, the area formed between the circular shroud and the collector can be separated from the flow field inside the casing, thereby avoiding flow loss in the space between the circular shroud and the collector. By setting the axis of the air inlet chamber to intersect the axis of the deflector assembly at an acute angle, the flow loss during airflow turning can be reduced, thereby improving the fan efficiency and the absolute value of the inlet total pressure.

[0005] To achieve the above objectives / to solve the above technical problems, the present invention is implemented using the following technical solution: A high-efficiency, low-noise centrifugal fan for a sanitation vehicle pneumatic system includes a casing assembly, an impeller, a guide vane assembly, an air inlet chamber, and a shaft assembly. The impeller is disposed inside the housing assembly, the shaft assembly is installed on one side of the housing assembly for connecting the impeller and the drive source, and the baffle assembly is installed on the other side of the housing assembly for connecting the air inlet chamber and the housing assembly; The air guide assembly includes an air collector, a circular cover, and a baffle ring. The circular cover is connected to the housing assembly and the air inlet chamber via connectors. An air collector is installed inside the circular cover and extends into the impeller inlet. A baffle ring is provided between the side of the air collector near the impeller and the circular cover to block the gap between the impeller and the circular cover. The air deflector assembly is horizontally positioned, and the angle between the axis of the air inlet chamber and the extended section of the axis of the air deflector assembly is an acute angle.

[0006] Furthermore, the connecting component includes a flat cover plate and a connecting flange. One side of the circular cover is connected to the housing assembly via the flat cover plate, and the other side is welded to the connecting flange together with the collector inlet, and is connected to the air inlet chamber via the connecting flange.

[0007] Furthermore, the fairing assembly also includes reinforcing ribs, which are installed on the outside of the circular fairing and fixed to the flat cover plate.

[0008] Furthermore, the number n of the reinforcing ribs is in the range of 4 ≤ n ≤ 6.

[0009] Furthermore, the collector, circular cover, reinforcing rib, connecting flange, and wind deflector are all located on the same side of the flat cover plate.

[0010] Furthermore, the angle between the axis of the air inlet chamber and the horizontal plane is 75°±5°.

[0011] Furthermore, the air inlet chamber includes a first side plate, a U-shaped plate, a second side plate, and a connecting flange. The first and second side plates of the air intake chamber are located on both sides of the U-shaped plate of the air intake chamber, and the air intake chamber connecting flange is installed on the top of the air intake chamber for connecting the vehicle's pneumatic system. The first side plate of the air inlet chamber is connected to the connecting flange, and the first side plate of the air inlet chamber has a round hole on the arc side near the U-shaped plate of the air inlet chamber, through which the airflow flows into the guide shroud assembly.

[0012] Furthermore, the impeller includes a rear disc assembly, a front disc, and a plurality of blades. The plurality of blades are evenly distributed circumferentially between the front disc and the rear disc assembly along the center of the impeller. The rear disc assembly includes a shaft disc seat and a rear disc, and the shaft disc seat is mounted on the rear disc.

[0013] Furthermore, the number of blades is 16.

[0014] Furthermore, the plane where the flat cover plate is located intersects with the front plate, and the opening diameter of the flat cover plate and the inner diameter of the circular cover are larger than the inlet diameter of the front plate.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention provides a flow guide assembly, a centrifugal fan, a pneumatic system for sanitation vehicles, and a sanitation vehicle. By setting a wind baffle between the circular cover and the collector, the area formed between the circular cover and the collector can be separated from the flow field inside the casing, thereby avoiding flow loss in the space between the circular cover and the collector. By setting the axis of the air inlet chamber to intersect the axis of the flow guide assembly at an acute angle, the flow loss when the airflow turns can be reduced, thereby improving the fan efficiency and the absolute value of the inlet total pressure. The air guide assembly, centrifugal fan, pneumatic system for sanitation vehicles, and sanitation vehicles provided by the present invention can support the circular cover by setting reinforcing ribs on the outside of the circular cover, so as to ensure the stability of the circular cover during air guidance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the high-efficiency, low-noise centrifugal fan provided in Embodiment 1; Figure 2 yes Figure 1 Schematic diagram of the middle housing assembly; Figure 3 yes Figure 1 Schematic diagram of the structure of the center fairing assembly; Figure 4 yes Figure 1 Side view of the center fairing assembly; Figure 5 yes Figure 1 Schematic diagram of the central air inlet chamber; Figure 6 This is a structural schematic diagram of an existing wind turbine.

[0017] In the diagram: 1. Casing assembly; 2. Impeller; 3. Shielding assembly; 31. Flat cover plate; 32. Collector; 33. Circular cover; 34. Reinforcing rib; 35. Connecting flange; 36. Wind deflector ring; 4. Air inlet chamber; 41. First side plate of air inlet chamber; 42. U-shaped plate of air inlet chamber; 43. Second side plate of air inlet chamber; 44. Connecting flange of air inlet chamber; 5. Shaft assembly; Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1

[0021] like Figure 1-5 As shown, this embodiment provides a centrifugal fan, including a casing assembly 1, an impeller 2, a guide vane assembly 3, an air inlet chamber 4, and a shaft assembly 5, wherein... The impeller 2 is disposed inside the housing assembly 1, the shaft assembly 5 is installed on one side of the housing assembly 1 for connecting the impeller 2 and the drive source, and the baffle assembly 3 is installed on the other side of the housing assembly 1 for connecting the air inlet chamber 4 and the housing assembly 1. The air guide assembly 3 includes an air collector 32, a circular cover 33, and a baffle ring 36. The circular cover 33 is connected to the housing assembly 1 and the air inlet chamber 4 via connectors. The air collector 32 is installed inside the circular cover 33. The air collector 32 extends into the inlet of the impeller 2. A baffle ring 36 is provided between the side of the air collector 32 near the impeller 2 and the circular cover 33 to block the gap between the impeller 2 and the circular cover 33. The air deflector assembly 3 is horizontally arranged, and the angle between the axis of the air inlet chamber 4 and the extended section of the axis of the air deflector assembly 3 is an acute angle.

[0022] In the above technical solution, the housing assembly 1 includes a housing 1 and a mounting bracket 12. The mounting bracket 12 is used for connecting and fixing the fan to the sanitation vehicle and the shaft assembly 5 to the housing 1, and to ensure the assembly position of each component. The shaft assembly 5 includes components such as a bearing seat, a rotary bearing and a main shaft. The shaft assembly 5 is mounted on the mounting bracket 12 through the bearing seat. The main shaft is connected to the bearing seat through the rotary bearing. One end of the main shaft is connected to the impeller 2 inside the housing 1, and the other end is connected to the transmission parts. The horizontal cross-section of the air inlet chamber 4 is rectangular. The inlet of the air inlet chamber is connected to the air-supported system of the sanitation vehicle. The axis of the air inlet chamber 4 intersects the axis of the guide shroud assembly 3 at an acute angle, which can reduce the flow loss when the airflow turns. The guide shroud assembly 3 consists of two parts at the impeller 2 inlet: one part is inside the impeller 2 inlet, namely the collector 32, and the other part is outside the impeller 2 inlet, namely the circular shroud 33. By setting the wind baffle 36 to block the gap between the inner and outer sides of the impeller inlet, the area formed between the circular shroud 33 and the collector 32 can be separated from the flow field inside the casing 1, thereby avoiding flow loss in the space between the circular shroud 33 and the collector 32.

[0023] In some embodiments, to achieve the connection between the air guide assembly 3, the housing assembly 1, and the air inlet chamber 4, the connecting component includes a flat cover plate 31 and a connecting flange 35. The circular cover 33 is welded to the flat cover plate 31, and the flat cover plate 31 is welded to the housing assembly 1. One side of the circular cover 33 is connected to the housing assembly 1 through the flat cover plate 31, and the other side is welded to the connecting flange 35 together with the inlet of the collector 32, and is connected to the air inlet chamber 4 through the connecting flange 35. Compared with the arc-shaped cover plate, the use of the flat cover plate 31 can reduce the processing cost and reduce the total pressure of the inlet under large air volume.

[0024] In some embodiments, to support the circular cover 33 and ensure its stability during flow guidance, the flow guide assembly 3 further includes a reinforcing rib 34, which is installed on the outside of the circular cover 33 and fixed to the flat cover plate 31.

[0025] In some embodiments, to ensure the support effect on the circular cover 33, the theoretical range of the number n of the reinforcing ribs 34 is 4≤n≤6, and the number of reinforcing ribs is not limited within this range.

[0026] In some embodiments, the collector 32, the circular cover 33, the reinforcing rib 34, the connecting flange 35, and the wind baffle 36 are all on the same side of the flat cover plate 31.

[0027] In some embodiments, the angle between the axis of the air inlet chamber 4 and the horizontal plane is 75°±5°.

[0028] In some embodiments, the air inlet chamber 4 includes a first side plate 41, a U-shaped plate 42, a second side plate 43, and a connecting flange 44. The first side plate 41 and the second side plate 43 of the air intake chamber are located on both sides of the U-shaped plate 42 of the air intake chamber, and the air intake chamber connecting flange 44 is installed on the top of the air intake chamber 4 for connecting the vehicle pneumatic system. The first side plate 41 of the air inlet chamber is connected to the connecting flange 35, and the first side plate 41 of the air inlet chamber has a round hole on the arc side near the U-shaped plate 42 of the air inlet chamber, through which the airflow flows into the guide shroud assembly 3.

[0029] In some embodiments, the impeller 2 is specifically constructed as follows: The impeller 2 includes a rear disc assembly, a front disc, and several blades. The blades are evenly distributed around the center of the impeller 2 between the front disc and the rear disc assembly. The rear disc assembly includes a shaft disc seat and a rear disc. The shaft disc seat is mounted on the rear disc. The impeller 2 is connected to the shaft system assembly 5 through the shaft disc seat.

[0030] In some embodiments, the number of blades is 16, but it is not limited to this. The number of blades can also be other, depending on the actual situation.

[0031] In some embodiments, to achieve the connection between the shroud assembly 3 and the impeller 2, the plane of the flat cover plate 31 intersects with the front disc of the impeller 2, and a hole for connecting the shroud assembly 3 and the housing assembly 1 is provided in the middle of the flat cover plate 31. Figure 1 As shown, the opening diameter of the flat cover plate 31 and the inner diameter of the circular cover 33 are larger than the diameter of the front plate inlet, and the inlet of the front plate is located inside the circular cover 33.

[0032] In summary, the high-efficiency, low-noise centrifugal fan for the pneumatic system of the sanitation vehicle provided in this embodiment, by setting a baffle ring between the circular cover 33 and the collector 32, can isolate the area formed between the circular cover 33 and the collector 32 from the flow field inside the casing 1, thereby avoiding flow loss in the space between the circular cover 33 and the collector 32. By setting the axis of the air inlet chamber 4 to intersect the axis of the guide shroud assembly 3 at an acute angle, the flow loss during airflow turning can be reduced, thereby improving the fan efficiency and the absolute value of the inlet total pressure. By setting a reinforcing rib 34 on the outside of the circular cover 33, the circular cover 33 can be supported to ensure the stability of the circular cover 33 during airflow guidance.

[0033] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A centrifugal fan guide assembly, characterized in that, include: The centrifugal fan has a collector (32), a circular cover (33), and a baffle ring (36). The circular cover (33) is connected to the casing assembly (1) and the air inlet chamber (4) of the centrifugal fan via connectors. The collector (32) is installed inside the circular cover (33). The collector (32) extends into the inlet of the impeller (2) of the centrifugal fan. A baffle ring (36) is provided between the collector (32) and the circular cover (33) on the side of the collector (32) near the impeller (2) to block the gap between the impeller (2) and the circular cover (33). The fairing assembly (3) is horizontally positioned; The connector includes a flat cover plate (31) and a connecting flange (35). One side of the circular cover (33) is connected to the housing assembly (1) through the flat cover plate (31), and the other side is connected to the flange (35) together with the inlet of the collector (32), and is connected to the air inlet chamber (4) through the connecting flange (35).

2. The fairing assembly according to claim 1, characterized in that, When the air deflector assembly (3) is set horizontally, the angle between the axis of the air inlet chamber (4) and the extended section of the axis of the air deflector assembly (3) is an acute angle.

3. The fairing assembly according to claim 1, characterized in that, When the air guide assembly (3) is set horizontally, the angle between the axis of the air inlet chamber (4) and the horizontal plane is 75°±5°.

4. The fairing assembly according to claim 1, characterized in that, The fairing assembly (3) further includes a reinforcing rib (34), which is installed on the outside of the circular fairing (33) and fixed to the flat cover plate (31); and, The number n of the reinforcing ribs (34) is in the range of 4≤n≤6.

5. The fairing assembly according to claim 1, characterized in that, The collector (32), circular cover (33), reinforcing rib (34), connecting flange (35) and windshield ring (36) are all on the same side of the flat cover plate (31).

6. A centrifugal fan, characterized in that, include: The housing assembly (1), the impeller (2), the shroud assembly (3) as described in any one of claims 1-5, and the air inlet chamber (4); The impeller (2) is disposed within the housing assembly (1); and The fairing assembly (3) is located on the other side of the housing assembly (1) and is used to connect the air inlet chamber (4) and the housing assembly (1).

7. The centrifugal fan according to claim 6, characterized in that, The air inlet chamber (4) includes a first side plate (41), a U-shaped plate (42), a second side plate (43), and a connecting flange (44). The first side plate (41) and the second side plate (43) of the air intake chamber are located on both sides of the U-shaped plate (42) of the air intake chamber, and the air intake chamber connecting flange (44) is installed on the top of the air intake chamber (4) for connecting the vehicle pneumatic system; The first side plate (41) of the air inlet chamber is connected to the connecting flange (35), and the first side plate (41) of the air inlet chamber has a round hole on the arc side near the U-shaped plate (42) of the air inlet chamber, through which the airflow flows into the guide shroud assembly (3).

8. The centrifugal fan according to claim 6, characterized in that, The impeller (2) includes a rear disc assembly, a front disc, and a plurality of blades. The plurality of blades are evenly distributed circumferentially around the center of the impeller (2) between the front disc and the rear disc assembly. The rear disc assembly includes a shaft disc holder and a rear disc, and the shaft disc holder is mounted on the rear disc. The number of blades is 16.

9. The centrifugal fan according to claim 6, characterized in that, The plane of the flat cover plate (31) intersects with the front plate, and the opening diameter of the flat cover plate (31) and the inner diameter of the circular cover (33) are larger than the inlet diameter of the front plate.

10. A pneumatic system for sanitation vehicles, characterized in that, The centrifugal fan described in any one of claims 6-9 is used.

11. A sanitation vehicle, characterized in that, The pneumatic system for sanitation vehicles as described in claim 10 is adopted.

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