Fixing structure of centrifugal fan current collector

Abstract

The utility model provides a fixing structure of a current collector of a centrifugal fan, and belongs to the technical field of fans. The technical problem that a current collector of an existing fan is prone to shaking is solved. The fixing structure of the centrifugal fan current collector comprises a support and a volute, an impeller is arranged in the volute, the volute comprises a front fixing shell, a rear fixing shell and a volute-shaped shell, an air inlet opposite to the impeller is formed in the front fixing shell, the current collector is arranged in the air inlet, and the current collector comprises a horn air inlet part, a horizontal part, a necking part and a connecting part. The horn air inlet part and the horizontal part are located outside the volute, the necking part and the connecting part are located inside the volute, the periphery of the horizontal part is fixedly connected with a fixing frame, the fixing frame is fixed to the outer side of the front fixing shell, the inner side of the front fixing shell is fixedly connected with at least two supporting blocks, and the supporting blocks are evenly distributed around the periphery of the necking part and abut against the necking part. The utility model has stronger vibration resistance, and improves the reliability and service life of the whole current collector structure and the fan operation.

Description

Technical Field

[0001] This utility model belongs to the field of fan technology, and specifically refers to a fixed structure for a centrifugal fan collector. Background Technology

[0002] Centrifugal fans are machines that rely on input mechanical energy to increase gas pressure and discharge gas. They are widely used in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings for ventilation, dust removal, and cooling; in boilers and industrial furnaces for ventilation and induced draft; in air conditioning equipment and household appliances for cooling and ventilation; in grain drying and conveying; and as wind sources for wind tunnels and for inflating and propelling hovercraft. Centrifugal fans work together through a collector, impeller, volute, and drive unit to draw in, pressurize, and discharge gas. The collector, located at the inlet end of the volute, is typically funnel-shaped and its function is to guide gas smoothly and evenly into the central area of ​​the impeller, reducing inlet flow losses. In existing technology, centrifugal fans operating under high air volume and high total pressure conditions experience collector swaying during the air intake process. This swaying collector affects the intake air velocity and thus the operating efficiency of the centrifugal fan. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a fixed structure for a centrifugal fan collector.

[0004] The objective of this utility model can be achieved through the following technical solution: A fixed structure for a centrifugal fan collector includes a support and a volute fixed on the support. An impeller is disposed inside the volute. The volute includes a front fixed shell, a rear fixed shell, and a volute-shaped shell fixedly connected to the front and rear fixed shells. An air inlet opposite to the impeller is disposed on the front fixed shell. A collector is disposed inside the air inlet. The collector includes a horn-shaped air inlet, a horizontal part, a constricted part, and a connecting part that are smoothly connected from the outside to the inside. The horn-shaped air inlet and the horizontal part are located outside the volute. The constricted part and the connecting part are located inside the volute. A fixing frame is fixedly connected to the outer periphery of the horizontal part. The fixing frame is fixed to the outer side of the front fixed shell. At least two support blocks are fixedly connected to the inner side of the front fixed shell. The support blocks are evenly distributed around the outer periphery of the constricted part and abut against the constricted part.

[0005] Furthermore, the front fixed shell is provided with a first fixing hole and a second fixing hole evenly distributed in a circumferential direction. The first fixing hole surrounds the outer periphery of the second fixing hole. The support block is fixedly connected to the second fixing hole through the second fixing member. The fixing frame is fixedly connected to the fixing frame through the first fixing member. The fixing frame is provided with a clearance hole, which is positioned opposite to the second fixing member.

[0006] Furthermore, the fixing frame includes a circular ring plate and fixing plates evenly distributed on the circular ring plate around its circumference. The clearance hole is located on the circular ring plate. One side of the fixing plate is welded and fixed to the circular ring plate, and the side of the fixing plate perpendicular to the circular ring plate is welded and fixed to the outer periphery of the horizontal part. A triangular notch is formed between the fixing plate, the circular ring plate, and the horizontal part.

[0007] Furthermore, there are four support blocks, each including a fixing part and a backing part. The fixing part is fixedly connected to the front fixing shell, and the backing part has an inclined surface that abuts against the constricted part.

[0008] Furthermore, the impeller is connected to a drive shaft, the drive shaft is connected to a drive motor, and the end of the impeller away from the drive shaft is embedded in the connecting part and has a gap with the inner circumference of the connecting part.

[0009] Compared with existing technologies, the technical effects of this utility model are as follows: 1. By fixing the outer periphery of the horizontal part of the collector with a fixed frame, the outer main body of the collector is rigidly connected and locked to the outside of the front fixed shell. The support blocks evenly distributed circumferentially on the inner side of the front fixed shell directly abut against the outer periphery of the constriction section in the key transition area of ​​the collector, effectively limiting the radial displacement and vibration of the collector inside the volute. The combination of the rigid fixation on the outside and the circumferential support on the inside forms a three-dimensional constraint on the entire collector, solving the problem of collector swaying under high air volume and high total pressure conditions. 2. The support blocks and fixed frame eliminate the swaying of the collector, ensuring the stability of the shape and position of the air inlet. This allows the gas to enter the impeller center area more smoothly and quickly according to the flow channels of the horn-shaped air inlet and the constriction section, significantly reducing inlet turbulence, eddies, and impact losses caused by collector vibration or displacement, reducing flow losses during the air intake process, improving gas flow efficiency, and thus improving the overall working efficiency and performance of the centrifugal fan. Third, the support blocks contact the abutment part of the collector's constriction through the inclined surface, which not only provides restraint, but also absorbs and disperses the vibration caused by the airflow to a certain extent. Multiple circumferentially distributed support blocks provide symmetrical and uniform support force, prevent local stress concentration, make the collector more evenly stressed, and have a stronger ability to resist vibration, thereby improving the reliability and service life of the entire collector structure and the operation of the fan. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of the present invention.

[0011] Figure 2 This is an enlarged view of section A of this utility model.

[0012] Figure 3 This utility model is a three-dimensional Figure 1 .

[0013] Figure 4This utility model is a three-dimensional Figure 2 .

[0014] Figure 5 This is the front view of this utility model.

[0015] Drawing number markings: 1. Support frame; 2. Volute; 201. Front fixed shell; 2011. Air inlet; 2012. Fixing hole one; 2013. Fixing hole two; 202. Rear fixed shell; 203. Volute shell; 3. Collector; 301. Horn-shaped air inlet; 302. Horizontal part; 303. Narrowing part; 304. Connecting part; 4. Impeller; 5. Fixed frame; 501. Clearance hole; 502. Circular plate; 503. Fixed plate; 504. Triangular notch; 6. Support block; 601. Fixed part; 602. Abutment part; 7. Drive shaft; 8. Fixing part one; 9. Fixing part two. Detailed Implementation

[0016] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0017] It should be noted that the descriptions of "up", "down", "left", "right", "top", "bottom", etc. in this utility model are defined based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] according to Figures 1 to 5As shown, a fixed structure for a centrifugal fan collector 3 includes a bracket 1 and a volute 2 fixed on the bracket 1. An impeller 4 is disposed inside the volute 2, and the impeller 4 is connected to a drive shaft 7, which is connected to a drive motor. The drive motor drives the impeller 4 to rotate. The volute 2 includes a front fixed shell 201, a rear fixed shell 202, and a volute shell 203 fixedly connected to the front fixed shell 201 and the rear fixed shell 202. The front fixed shell 201 is provided with an air inlet 2011 opposite to the impeller 4. An air collector 3 is provided inside the air inlet 2011. The air collector 3 includes a horn-shaped air inlet 301, a horizontal part 302, a constricted part 303, and a connecting part 304 that are smoothly connected from the outside to the inside. The horn-shaped air inlet 301 and the horizontal part 302 are located outside the volute 2, and the constricted part 303 and the connecting part 304 are located inside the volute 2. A fixing frame 5 is fixedly connected to the outer periphery of the horizontal part 302. The fixing frame 5 is fixed to the outer side of the front fixed shell 201. At least two support blocks 6 are fixedly connected to the inner side of the front fixed shell 201. The support blocks 6 are evenly distributed around the outer periphery of the constricted part 303 and abut against the constricted part 303. The end of the impeller 4 furthest from the drive shaft 7 is embedded in the connecting part 304 and has a gap with the inner circumference of the connecting part 304. The outer main body of the collector 3 is rigidly connected and locked to the outside of the front fixed shell 201 by the fixing bracket 5 fixed to the outer circumference of the horizontal part 302 of the collector 3. The support blocks 6, which are evenly distributed in the inner circumference of the front fixed shell 201, directly abut against the outer circumference of the narrowed part 303 in the key transition area of ​​the collector 3, effectively limiting the radial displacement and vibration of the collector 3 inside the volute 2. The combination of the rigid fixation on the outside and the circumferential support on the inside forms a three-dimensional constraint on the collector 3 as a whole, solving the problem of the collector 3 shaking under high air volume and high total pressure conditions.

[0019] To better install the support block 6, two circumferentially distributed fixing holes 2012 and 2013 are provided on the front fixed shell 201. The fixing hole 2012 surrounds the outer periphery of the fixing hole 2013. The support block 6 is fixedly connected to the fixing hole 2013 via a fixing member 9. The fixing frame 5 is fixedly connected to the fixing frame 5 via a fixing member 8. The fixing frame 5 is provided with a clearance hole 501, which is opposite to the fixing member 9. The fixing frame 5 includes a circular ring plate 502 and fixing plates 503 circumferentially distributed on the circular ring plate 502. The clearance hole 501 is located on the circular ring plate 502. The fixing plate 503 is in the shape of a right triangle. One side of the fixing plate 503 is welded to the circular ring plate 502, and the side of the fixing plate 503 perpendicular to the circular ring plate 502 is welded to the outer periphery of the horizontal part 302. A triangular notch 504 is formed between the fixing plate 503, the circular ring plate 502, and the horizontal part 302. The support block 6 consists of four parts, each including a fixing part 601 and abutment part 602. The fixing part 601 is fixedly connected to the front fixed shell 201, and the abutment part 602 has an inclined surface that abuts against the constriction part 303. The support block 6 and the fixing frame 5 eliminate the shaking of the collector 3, ensuring the stability of the shape and position of the air inlet 2011. This allows the gas to enter the central area of ​​the impeller 4 more smoothly and quickly according to the flow channels of the horn-shaped air inlet 301 and the constriction part 303, significantly reducing the inlet turbulence, eddies, and impact losses caused by the vibration or displacement of the collector 3, reducing the flow loss during the air intake process, and improving the gas flow efficiency, thereby improving the overall working efficiency and performance of the centrifugal fan. The support block 6 contacts the abutment part 602 of the constriction part 303 of the collector 3 through the inclined surface, which not only provides restraint, but also absorbs and disperses the vibration caused by the airflow to a certain extent. The multiple circumferentially distributed support blocks 6 provide symmetrical and uniform support force, prevent local stress concentration, make the collector 3 more balanced in force, and have a stronger ability to resist vibration, thereby improving the reliability and service life of the entire collector 3 structure and the operation of the fan.

[0020] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection defined by the claims of the present utility model.

Claims

1. A fixed structure for a centrifugal fan collector, comprising a support (1) and a volute (2) fixed on the support (1), wherein an impeller (4) is disposed inside the volute (2), the volute (2) comprising a front fixed shell (201), a rear fixed shell (202), and a volute-shaped shell (203) fixedly connected by the front fixed shell (201) and the rear fixed shell (202), wherein an air inlet (2011) is disposed on the front fixed shell (201) opposite to the impeller (4), and a collector (3) is disposed inside the air inlet (2011), characterized in that: The collector (3) includes a horn-shaped air inlet (301), a horizontal section (302), a constricted section (303), and a connecting section (304) that are smoothly connected from the outside to the inside. The horn-shaped air inlet (301) and the horizontal section (302) are located outside the volute (2), and the constricted section (303) and the connecting section (304) are located inside the volute (2). A fixing frame (5) is fixedly connected to the outer periphery of the horizontal section (302). The fixing frame (5) is fixed to the outer side of the front fixing shell (201). At least two support blocks (6) are fixedly connected to the inner side of the front fixing shell (201). The support blocks (6) are evenly distributed around the outer periphery of the constricted section (303) and abut against the constricted section (303).

2. The fixing structure of a centrifugal fan collector according to claim 1, characterized in that: The front fixed shell (201) is provided with a first fixing hole (2012) and a second fixing hole (2013) evenly distributed in a circumferential direction. The first fixing hole (2012) surrounds the outer periphery of the second fixing hole (2013). The support block (6) is fixedly connected to the second fixing hole (2013) through the second fixing member (9). The fixing frame (5) is fixedly connected to the fixing frame (5) through the first fixing member (8). The fixing frame (5) is provided with a clearance hole (501). The clearance hole (501) is arranged opposite to the second fixing member (9).

3. The fixing structure of a centrifugal fan collector according to claim 2, characterized in that: The fixing frame (5) includes a circular ring plate (502) and fixing plates (503) evenly distributed on the circular ring plate (502) around the circumference. The clearance hole (501) is located on the circular ring plate (502). One side of the fixing plate (503) is welded and fixed to the circular ring plate (502), and the side of the fixing plate (503) perpendicular to the circular ring plate (502) is welded and fixed to the outer periphery of the horizontal part (302). A triangular notch (504) is formed between the fixing plate (503), the circular ring plate (502) and the horizontal part (302).

4. The fixing structure of a centrifugal fan collector according to claim 1, characterized in that: The support block (6) has four parts. The support block (6) includes a fixing part (601) and abutting part (602). The fixing part (601) is fixedly connected to the front fixing shell (201). The abutting part (602) has an inclined surface that abuts against the constricted part (303).

5. The fixing structure of a centrifugal fan collector according to any one of claims 1 to 4, characterized in that: The impeller (4) is connected to a drive shaft (7), the drive shaft (7) is connected to a drive motor, and the end of the impeller (4) away from the drive shaft (7) is embedded in the connecting part (304) and has a gap with the inner circumference of the connecting part (304).

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