CN115750438A - Single-suction three-dimensional flow impeller assembly for large-scale high-temperature centrifugal fan - Google Patents

Abstract

The invention provides a single-suction three-dimensional flow impeller assembly for a large-scale high-temperature centrifugal fan, which comprises: the device comprises 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, a plurality of blades and a blade cover plate; the arc lifting sleeve, the blade and the blade cover plate are all a single piece; the arc lifting sleeve is formed by splicing an inner section and an outer section, the blade cover plate is formed by splicing an inner plate and an outer plate, and the single blade is formed by splicing an inner plate and an outer plate; the beneficial technical effects of the invention are as follows: the scheme can keep the integrity of the blades of the three-dimensional flow impeller under the condition of realizing stable connection of the main shaft, so that the advantages of the three-dimensional flow impeller are fully exerted.

Description

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

technical field

The invention relates to a large-scale centrifugal fan technology, in particular to a single-suction three-dimensional flow impeller assembly for a large-scale high-temperature centrifugal fan.

Background technique

The three-dimensional flow impeller is a relatively advanced impeller configuration, which has been widely used in many fields, but in the field of large-scale high-temperature fans, the application of the three-dimensional flow impeller is not smooth, the specific reasons are:

Considering the structural stability, large fans need to use F-type transmission, which requires the main shaft to run through the entire fan, so the main shaft and the three-dimensional flow impeller can only be connected at the connection plate on the back of the three-dimensional flow impeller;

The working temperature of the large-scale high-temperature fan used to convey high-temperature gas medium is generally in the range of 180-700°C. In order to prevent the connection structure between the main shaft and the three-dimensional flow impeller from loosening under the action of thermal expansion and contraction, it is generally installed on the main shaft. The one-piece annular protrusion is connected with the connection plate through the annular protrusion; due to the large size and weight of the three-dimensional flow impeller, and the influence of thermal expansion and contraction must also be considered, in order to ensure structural stability, the annular protrusion and The connecting discs must be connected by interference fit through hinged bolts, which leads to 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 the bolts must also Allow enough space for the installation;

Based on the prior art, it is known that the air inlet of the three-dimensional flow impeller with complete blades is an annular area, and the inner diameter of the annular area is much smaller than the outer diameter of the aforementioned annular protrusion. If the three-dimensional flow impeller with complete blades is directly used, The connection between the annular protrusion and the connection plate will not be realized. To solve this problem, the solution in the prior art is to omit the vane at the air inlet, thereby increasing the inner diameter of the aforementioned annular area, and the resulting space It is used to realize the connection between the annular protrusion and the connection plate. The biggest disadvantage of this solution is that because the blades at the air inlet are omitted, the impact of the air inlet will increase, and the efficiency of the impeller will be significantly lost, resulting in three-dimensional flow. The advantages of the impeller cannot be brought into full play, and at the same time, in order to protect the connection between the annular protrusion and the connecting disc, an additional protective cover needs to be provided, which is very troublesome.

Contents of the invention

Aiming at the problems in the background technology, the present invention proposes a single-suction three-dimensional flow impeller assembly for a large-scale high-temperature centrifugal fan. The innovation is that the single-suction three-dimensional flow impeller assembly includes: Disk and ternary flow impeller device; the ternary flow impeller device is composed of arc-lifting sleeves, multiple blades and blade cover plates;

The middle part of the main shaft is provided with an integrated annular protrusion, and a plurality of connection holes are arranged on the annular protrusion; a through hole is arranged in the middle part of the connection plate, and a plurality of bolt holes are arranged around the through hole; the main shaft is sleeved in the through hole, The end surface of the connection plate is in contact with the end surface of the annular protrusion, and bolts are arranged in the connection hole and the bolt hole to lock the connection plate and the annular protrusion;

The arc lifting sleeve is a trumpet-shaped structure, the inner diameter of the inner end of the arc lifting sleeve is larger than the outer diameter of the annular protrusion, the inner diameter of the outer end of the arc lifting sleeve is smaller than the outer diameter of the annular protrusion, the arc lifting sleeve is sleeved outside the main shaft, and the inner end of the arc lifting sleeve It is fixedly connected with the end surface of the connecting plate; the inner edge of the blade is fixedly connected with the surface of the arc-lifting sleeve, and multiple blades are distributed along the circumferential direction; the blade cover plate is set outside the main shaft, and the contour of the inner wall of the blade cover plate is set along with the outer edge of the blade. The inner wall of the blade cover plate is fixedly connected with the outer edge of the blade;

The arc lifting sleeve, the blade and the blade cover plate are all single pieces; the arc lifting sleeve is spliced by the inner section and the outer section, and the junction of the inner section and the outer section is recorded as the interface, and the interface is distributed along the circumferential direction of the arc lifting sleeve , the inner diameter of the interface is larger than the outer diameter of the annular protrusion; the blade cover plate is spliced by the inner plate and the outer plate, and the junction of the inner plate and the outer plate is recorded as the connection port, and the connection ports are distributed along the circumference of the blade cover plate, The inner diameter of the connection port is larger than the outer diameter of the annular protrusion; a single blade is spliced by an inner piece and an outer piece, and the junction of the inner piece and the outer piece is recorded as the contact surface, and the inner end of the contact surface corresponds to the interface. The outer end of the surface corresponds to the connection port, and the contact surface is a plane.

The principle of the aforementioned scheme is: design the complete three-dimensional flow impeller as an assembled structure. When assembling, firstly connect the connecting plate inside the three-dimensional flow impeller with the annular protrusion on the main shaft, and then connect the rest of the three-dimensional flow impeller. The components are installed in place, and finally, the integrity of the three-dimensional flow impeller blade can be maintained on the basis of realizing the stable connection of the main shaft, thereby solving the problem of efficiency loss described in the background technology. The specific implementation can be carried out as follows:

1) Weld the inner end of the inner section to the corresponding position on the connection plate; weld the inner edges of the outer sheets to the surface of the outer section; weld the outer edges of the outer sheets to the inner wall of the outer plate; The structure composed of segment, outer plate and outer plate is recorded as component one;

2) Weld the inner edges of multiple inner sheets with the surface of the inner section;

3) Weld the inner wall of the inner plate with the outer edge of the inner plate;

4) Insert the main shaft into the through hole, and lock the connection plate and the annular protrusion with bolts; the structure composed of the main shaft, connection plate, inner section, inner plate and inner plate is recorded as component two;

5) Splice part 1 and part 2 together. After splicing, multiple inner pieces and multiple outer pieces are spliced into multiple complete blades, and the inner section and outer section are spliced into a complete arc-lifting sleeve. The complete blade cover plate is spliced, and the splicing part is welded and fixed; the single-suction three-dimensional flow impeller assembly is completed.

During specific implementation, in order to ensure structural stability, a bush made of light material is arranged in the inner hole of the arc lifting sleeve, and the bush is sleeved on the main shaft.

The beneficial technical effects of the present invention are: a single-suction three-dimensional flow impeller assembly for a large-scale high-temperature centrifugal fan is proposed, which can maintain the integrity of the three-dimensional flow impeller blade under the condition of realizing a stable connection of the main shaft , so that the advantages of the three-dimensional flow impeller can be fully utilized.

Description of drawings

Fig. 1, the structure diagram one of single-suction three-dimensional flow impeller assembly of the present invention;

Fig. 2. Structural schematic diagram 2 of the single-suction three-dimensional flow impeller assembly of the present invention;

Fig. 3, the schematic diagram of the manufacturing process of the present invention;

Fig. 4, a structural schematic diagram of part one;

The names corresponding to each mark in the figure are: main shaft 1, annular protrusion 11, connection plate 2, arc lifting sleeve 3, inner section 31, outer section 32, interface 33, blade 4, inner piece 41, outer piece 42, The contact surface 43 , the blade cover plate 5 , the inner plate 51 , the outer plate 52 , and the connecting port 53 .

Detailed ways

A single-suction three-dimensional flow impeller assembly for a large-scale high-temperature centrifugal fan, the innovation of which is: 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, a plurality of blades 4 and a blade cover plate 5;

The middle part of the main shaft 1 is provided with an integrated annular protrusion 11, and a plurality of connecting holes are arranged on the annular protrusion 11; a through hole is arranged in the middle part of the connecting plate 2, and a plurality of bolt holes are arranged around the through hole; the main shaft 1 is set on the In the through hole, the end face of the connecting disc 2 is in contact with the end face of the annular protrusion 11, and bolts are arranged in the connecting hole and the bolt hole to lock the connecting disc 2 and the annular protrusion 11;

The arc lifting sleeve 3 is a trumpet-shaped structure, the inner diameter of the inner end of the arc lifting sleeve 3 is larger than the outer diameter of the annular protrusion 11, the inner diameter of the outer end of the arc lifting sleeve 3 is smaller than the outer diameter of the annular protrusion 11, and the arc lifting sleeve 3 is set on the main shaft 1, the inner end of the arc lifting sleeve 3 is fixedly connected with the end surface of the connecting plate 2; the inner edge of the blade 4 is fixedly connected with the surface of the arc lifting sleeve 3, and a plurality of blades 4 are distributed along the circumferential direction; the blade cover plate 5 is set outside the main shaft 1, The contour of the inner wall of the blade cover plate 5 is set along with the outer edge of the blade 4, and the inner wall of the blade cover plate 5 is fixedly connected with the outer edge of the blade 4;

The arc lifting sleeve 3, the blade 4 and the blade cover plate 5 are all single pieces; the arc lifting sleeve 3 is spliced by the inner section 31 and the outer section 32, and the junction of the inner section 31 and the outer section 32 is marked as the interface 33 , the interface 33 is distributed along the circumferential direction of the arc lifting sleeve 3, and the inner diameter of the interface 33 is larger than the outer diameter of the annular protrusion 11; The junction of the connection port 53 is recorded as the connection port 53, and the connection port 53 is distributed along the circumferential direction of the blade cover plate 5. The inner diameter of the connection port 53 is larger than the outer diameter of the annular protrusion 11; the single blade 4 is spliced by the inner sheet 41 and the outer sheet 42. The junction of the inner sheet 41 and the outer sheet 42 is marked as the contact surface 43, the inner end of the contact surface 43 corresponds to the interface 33, the outer end of the contact surface 43 corresponds to the connection port 53, and the contact surface 43 is a plane.

Claims (1)

1. The utility model provides a singly inhale formula ternary flow impeller assembly for large-scale high temperature centrifugal fan which characterized in that: the single suction three-dimensional flow impeller assembly comprises: the device comprises a main shaft (1), a connecting disc (2) and a three-dimensional flow impeller device; the three-dimensional flow impeller device consists of an arc lifting sleeve (3), a plurality of blades (4) and a blade cover plate (5);

the middle part of the main shaft (1) is provided with an integrated annular bulge (11), and the annular bulge (11) is provided with a plurality of connecting holes; a through hole is formed in the middle of the connecting disc (2), and a plurality of bolt holes are formed in the periphery of the through hole; the spindle (1) is sleeved in the through hole, the end face of the connecting disc (2) is in contact with the end face of the annular bulge (11), and bolts are arranged in the connecting hole and the bolt hole to lock the connecting disc (2) and the annular bulge (11);

the arc lifting sleeve (3) is of a horn-shaped structure, the inner diameter of the inner end of the arc lifting sleeve (3) is larger than the outer diameter of the annular bulge (11), the inner diameter of the outer end of the arc lifting sleeve (3) is smaller than the outer diameter of the annular bulge (11), the arc lifting sleeve (3) is sleeved outside the main shaft (1), and the inner end of the arc lifting sleeve (3) is fixedly connected with the end face of the connecting disc (2); the inner edge of each blade (4) is fixedly connected with the surface of the arc lifting sleeve (3), and a plurality of blades (4) are distributed along the circumferential direction; the blade cover plate (5) is sleeved outside the main shaft (1), the outline of the inner wall of the blade cover plate (5) is arranged along the shape of the outer edge of the blade (4), and the inner wall of the blade cover plate (5) is fixedly connected with the outer edge of the blade (4);

the arc lifting sleeve (3), the blade (4) and the blade cover plate (5) are all a single piece; the arc lifting sleeve (3) is formed by splicing an inner section (31) and an outer section (32), the junction of the inner section (31) and the outer section (32) is marked as an interface (33), the interfaces (33) are circumferentially distributed along the arc lifting sleeve (3), and the inner diameter of the interface (33) is larger than the outer diameter of the annular bulge (11); the blade cover plate (5) is formed by splicing an inner plate (51) and an outer plate (52), the junction of the inner plate (51) and the outer plate (52) is marked as a connecting port (53), the connecting ports (53) are distributed along the circumferential direction of the blade cover plate (5), and the inner diameter of each connecting port (53) is larger than the outer diameter of the annular bulge (11); the single blade (4) is formed by splicing an inner blade (41) and an outer blade (42), the junction of the inner blade (41) and the outer blade (42) is marked as a contact surface (43), the inner end of the contact surface (43) corresponds to the interface (33), the outer end of the contact surface (43) corresponds to the connecting port (53), and the contact surface (43) is a plane.

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