Single-suction three-dimensional impeller assembly for large high-temperature centrifugal fans

Abstract

This invention proposes a single-suction three-dimensional flow impeller assembly for large high-temperature centrifugal fans. The single-suction three-dimensional flow impeller assembly includes: a main shaft, a connecting disc, and a three-dimensional flow impeller device. The three-dimensional flow impeller device consists of an arc-lifting sleeve, multiple blades, and a blade cover plate. The arc-lifting sleeve, blades, and blade cover plate are all single-unit components. The arc-lifting sleeve is assembled from an inner section and an outer section, the blade cover plate is assembled from an inner plate and an outer plate, and each blade is assembled from an inner plate and an outer plate. The beneficial technical effect of this invention is that it proposes a single-suction three-dimensional flow impeller assembly for large high-temperature centrifugal fans. This solution can maintain the integrity of the three-dimensional flow impeller blades while achieving a stable connection of the main shaft, thus fully leveraging the advantages of the three-dimensional flow impeller.

Description

Technical Field

[0001] This invention relates to a technology for large centrifugal fans, and more particularly to a single-suction three-dimensional flow impeller assembly for large high-temperature centrifugal fans. Background Technology

[0002] The three-dimensional impeller is a relatively advanced impeller configuration that has been widely used in many fields. However, its application in the field of large high-temperature fans has not been very successful. The specific reasons are as follows:

[0003] Considering structural stability, large wind turbines must adopt F-type transmission. This transmission method requires the main shaft to run through the entire wind turbine. Therefore, the main shaft and the three-dimensional impeller can only be connected at the connecting plate on the back of the three-dimensional impeller.

[0004] Large high-temperature fans used for conveying high-temperature gas media typically operate in the range of 180-700℃. To prevent the connection between the main shaft and the three-dimensional impeller from loosening due to thermal expansion and contraction, an integrated annular protrusion is usually installed on the main shaft, which connects to the connecting plate. Due to the large size and weight of the three-dimensional impeller, and considering the effects of thermal expansion and contraction, the annular protrusion and the connecting plate must be connected by hinged bolts with an interference fit to ensure structural stability. This results in a large radial dimension of the annular protrusion (the outer diameter of the annular protrusion is generally 1.5 times the diameter of the main shaft), and sufficient operating space must be provided for bolt installation.

[0005] Based on existing technology, the air inlet of a three-dimensional flow impeller with complete blades is an annular region. The inner diameter of this annular region is much smaller than the outer diameter of the aforementioned annular protrusion. If a three-dimensional flow impeller with complete blades is used directly, the connection between the annular protrusion and the connecting plate cannot be achieved. To solve this problem, the existing technology omits the blades at the air inlet, thereby increasing the inner diameter of the aforementioned annular region. The resulting space is used to connect the annular protrusion and the connecting plate. The biggest drawback of this solution is that, because the blades at the air inlet are omitted, the air inlet impact increases, and the impeller efficiency is significantly reduced, preventing the advantages of the three-dimensional flow impeller from being fully utilized. At the same time, in order to protect the connection between the annular protrusion and the connecting plate, an additional protective cover is required, which is very troublesome. Summary of the Invention

[0006] To address the problems in the background art, this invention proposes a single-suction three-dimensional flow impeller assembly for large high-temperature centrifugal fans. Its innovation lies in the following: the single-suction three-dimensional flow impeller assembly includes: a main shaft, a connecting disc, and a three-dimensional flow impeller device; the three-dimensional flow impeller device is composed of an arc-lifting sleeve, multiple blades, and a blade cover plate.

[0007] The spindle has an integral annular protrusion in the middle, and multiple connecting holes are provided on the annular protrusion; the connecting plate has a through hole in the middle, and multiple bolt holes are provided around the through hole; the spindle is sleeved in the through hole, the end face of the connecting plate contacts the end face of the annular protrusion, and bolts are provided in the connecting holes and bolt holes to lock the connecting plate and the annular protrusion.

[0008] The lifting sleeve has a trumpet-shaped structure. The inner diameter of the inner end of the lifting sleeve is larger than the outer diameter of the annular protrusion, and the inner diameter of the outer end of the lifting sleeve is smaller than the outer diameter of the annular protrusion. The lifting sleeve is fitted outside the main shaft, and the inner end of the lifting sleeve is fixedly connected to the end face of the connecting plate. The inner edge of the blade is fixedly connected to the surface of the lifting sleeve, and multiple blades are distributed circumferentially. The blade cover plate is fitted outside the main shaft, and the contour of the inner wall of the blade cover plate is set to conform to the outer edge of the blade. The inner wall of the blade cover plate is fixedly connected to the outer edge of the blade.

[0009] The lifting sleeve, blades, and blade cover are all single-piece components. The lifting sleeve is composed of an inner section and an outer section, with the junction of the inner and outer sections designated as the interface. The interfaces are distributed circumferentially along the lifting sleeve, and the inner diameter of the interface is larger than the outer diameter of the annular protrusion. The blade cover is composed of an inner plate and an outer plate, with the junction of the inner and outer plates designated as the connection port. The connection ports are distributed circumferentially along the blade cover, and the inner diameter of the connection port is larger than the outer diameter of the annular protrusion. A single blade is composed of an inner sheet and an outer sheet, with the junction of the inner and outer sheets designated as the contact surface. The inner end of the contact surface corresponds to the interface, and the outer end of the contact surface corresponds to the connection port. The contact surface is a plane.

[0010] The principle of the aforementioned solution is as follows: the complete three-dimensional impeller is designed as an assembled structure. During assembly, the connecting disc inside the three-dimensional impeller is first connected to the annular protrusion on the main shaft. Then, the remaining components of the three-dimensional impeller are installed in place. Finally, the integrity of the three-dimensional impeller blades can be maintained while achieving a stable connection to the main shaft, thereby solving the efficiency loss problem mentioned in the background technology. In specific implementation, the following steps can be taken:

[0011] 1) Weld the inner end of the inner section to the corresponding position on the connecting plate; weld the inner edges of multiple outer pieces to the surface of the outer section; weld the outer edges of multiple outer pieces to the inner wall of the outer plate; the structure composed of the outer section, outer pieces and outer plate is called component one;

[0012] 2) Weld the inner edges of the multiple inner pieces to the surface of the inner section;

[0013] 3) Weld the inner wall of the inner plate to the outer edge of the inner sheet;

[0014] 4) Insert the spindle into the through hole and tighten the connecting plate and the annular protrusion with bolts; the structure consisting of the spindle, connecting plate, inner section, inner plate and inner sheet is called component two;

[0015] 5) Assemble component one and component two together. After assembly, multiple inner pieces and multiple outer pieces are assembled into multiple complete blades. The inner section and outer section are assembled into a complete lifting sleeve. The inner plate and outer plate are assembled into a complete blade cover plate. Weld and fix the splicing points. The single-suction three-dimensional flow impeller assembly is completed.

[0016] In practice, to ensure structural stability, a bushing made of lightweight material is installed in the inner hole of the lifting sleeve, and the bushing is fitted onto the main shaft.

[0017] The beneficial technical effects of this invention are: it proposes a single-suction three-dimensional flow impeller assembly for large high-temperature centrifugal fans. This solution can maintain the integrity of the three-dimensional flow impeller blades while achieving a stable connection of the main shaft, thus giving full play to the advantages of the three-dimensional flow impeller. Attached Figure Description

[0018] Figure 1 Schematic diagram of the single-suction three-dimensional flow impeller assembly of the present invention Figure 1 ;

[0019] Figure 2 Schematic diagram of the single-suction three-dimensional flow impeller assembly of the present invention Figure 2 ;

[0020] Figure 3 A schematic diagram of the manufacturing process of this invention;

[0021] Figure 4 Component 1 structural diagram;

[0022] The names corresponding to the various markings in the figure are as follows: spindle 1, annular protrusion 11, connecting plate 2, lifting sleeve 3, inner section 31, outer section 32, interface 33, blade 4, inner plate 41, outer plate 42, contact surface 43, blade cover plate 5, inner plate 51, outer plate 52, and connection port 53. Detailed Implementation

[0023] An innovation of a single-suction three-dimensional flow impeller assembly for large high-temperature centrifugal fans is that the single-suction three-dimensional flow impeller assembly includes: a main shaft 1, a connecting plate 2, and a three-dimensional flow impeller device; the three-dimensional flow impeller device is composed of an arc-lifting sleeve 3, multiple blades 4, and a blade cover plate 5.

[0024] The spindle 1 has an integral annular protrusion 11 in the middle, and multiple connecting holes are provided on the annular protrusion 11; the connecting plate 2 has a through hole in the middle, and multiple bolt holes are provided around the through hole; the spindle 1 is fitted into the through hole, and the end face of the connecting plate 2 contacts the end face of the annular protrusion 11; bolts are provided in the connecting holes and bolt holes to lock the connecting plate 2 and the annular protrusion 11.

[0025] The lifting sleeve 3 has a trumpet-shaped structure. The inner diameter of the inner end of the lifting sleeve 3 is larger than the outer diameter of the annular protrusion 11, and the inner diameter of the outer end of the lifting sleeve 3 is smaller than the outer diameter of the annular protrusion 11. The lifting sleeve 3 is fitted outside the main shaft 1, and the inner end of the lifting sleeve 3 is fixedly connected to the end face of the connecting plate 2. The inner edge of the blade 4 is fixedly connected to the surface of the lifting sleeve 3, and multiple blades 4 are distributed circumferentially. The blade cover plate 5 is fitted outside the main shaft 1, and the contour of the inner wall of the blade cover plate 5 is set to conform to the outer edge of the blade 4. The inner wall of the blade cover plate 5 is fixedly connected to the outer edge of the blade 4.

[0026] The lifting sleeve 3, blade 4, and blade cover plate 5 are all single-piece components. The lifting sleeve 3 is composed of an inner section 31 and an outer section 32. The junction of the inner section 31 and the outer section 32 is called the interface 33. The interface 33 is distributed circumferentially along the lifting sleeve 3, and the inner diameter of the interface 33 is larger than the outer diameter of the annular protrusion 11. The blade cover plate 5 is composed of an inner plate 51 and an outer plate 52. The junction of the inner plate 51 and the outer plate 52 is called the connection port 53. The connection port 53 is distributed circumferentially along the blade cover plate 5, and the inner diameter of the connection port 53 is larger than the outer diameter of the annular protrusion 11. The single blade 4 is composed of an inner piece 41 and an outer piece 42. The junction of the inner piece 41 and the outer piece 42 is called the contact surface 43. The inner end of the contact surface 43 corresponds to the interface 33, and the outer end of the contact surface 43 corresponds to the connection port 53. The contact surface 43 is a plane.

Claims

1. A single-suction three-dimensional flow impeller assembly for a large high-temperature centrifugal fan, characterized in that: The single-suction three-dimensional impeller assembly includes: a main shaft (1), a connecting disc (2), and a three-dimensional impeller device; the three-dimensional impeller device consists of an arc-lifting sleeve (3), multiple blades (4), and a blade cover plate (5); The main shaft (1) has an integral annular protrusion (11) in the middle, and multiple connecting holes are provided on the annular protrusion (11); the connecting plate (2) has a through hole in the middle, and multiple bolt holes are provided around the through hole; the main shaft (1) is fitted in the through hole, and the end face of the connecting plate (2) contacts the end face of the annular protrusion (11); bolts are provided in the connecting hole and bolt holes to lock the connecting plate (2) and the annular protrusion (11); The lifting sleeve (3) is a trumpet-shaped structure. The inner diameter of the inner end of the lifting sleeve (3) is larger than the outer diameter of the annular protrusion (11), and the inner diameter of the outer end of the lifting sleeve (3) is smaller than the outer diameter of the annular protrusion (11). The lifting sleeve (3) is fitted outside the main shaft (1), and the inner end of the lifting sleeve (3) is fixedly connected to the end face of the connecting plate (2). The inner edge of the blade (4) is fixedly connected to the surface of the lifting sleeve (3), and multiple blades (4) are distributed circumferentially. The blade cover plate (5) is fitted outside the main shaft (1), and the outline of the inner wall of the blade cover plate (5) is set to conform to the outer edge of the blade (4). The inner wall of the blade cover plate (5) is fixedly connected to the outer edge of the blade (4). The lifting sleeve (3), blade (4), and blade cover plate (5) are all single-piece components; the lifting sleeve (3) is composed of an inner section (31) and an outer section (32), and the junction of the inner section (31) and the outer section (32) is called the interface (33). The interface (33) is distributed circumferentially along the lifting sleeve (3), and the inner diameter of the interface (33) is larger than the outer diameter of the annular protrusion (11); the blade cover plate (5) is composed of an inner plate (51) and an outer plate (52), and the junction of the inner plate (51) and the outer plate (52) is called the interface (33). The connection port (53) is distributed around the blade cover plate (5). The inner diameter of the connection port (53) is larger than the outer diameter of the annular protrusion (11). A single blade (4) is spliced ​​together from an inner piece (41) and an outer piece (42). The junction of the inner piece (41) and the outer piece (42) is called the contact surface (43). The inner end of the contact surface (43) corresponds to the interface (33), and the outer end of the contact surface (43) corresponds to the connection port (53). The contact surface (43) is a plane.

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