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CN-122014676-A - Multi-wing centrifugal fan outlet composite flow guiding device and multi-wing centrifugal fan

CN122014676ACN 122014676 ACN122014676 ACN 122014676ACN-122014676-A

Abstract

The invention discloses a multi-wing centrifugal fan outlet composite flow guiding device and a multi-wing centrifugal fan. The outlet composite flow guiding device can effectively improve pneumatic efficiency and outlet flow and reduce energy consumption and operation noise through structural innovation and flow field optimization design; the spiral casing comprises a spiral casing and an impeller arranged in the spiral casing, wherein a flow director is arranged at an outlet section of the spiral casing and is in transmission connection with an A motor, the flow director can be driven by the A motor to adjust circumferential postures, the flow director is in an X shape and consists of two flow directors which are mutually intersected, the impeller comprises a mounting disc and a mounting ring which are distributed oppositely, a group of rectifying sheets are arranged between the mounting disc and the mounting ring at intervals along the circumferential direction of the impeller, micropores are formed in the surface of the rectifying sheets, two ends of the rectifying sheets are fixedly connected with the mounting disc and the mounting ring respectively, a shaft sleeve used for connecting an output shaft of the B motor is arranged in the middle of the mounting disc, and the flow directors and the rectifying sheets are arc-shaped curved surfaces.

Inventors

  • YANG ZHAO
  • GE SHAOHUA
  • Zhang Ashe
  • ZHANG HAIBIN
  • Xu Chuanxu

Assignees

  • 浙江尔格科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260331

Claims (10)

  1. 1. The multi-wing centrifugal fan outlet composite flow guiding device comprises a volute (1) and an impeller (2) arranged in the volute (1), and is characterized in that a flow guiding device (3) is arranged at an outlet section of the volute (1), the flow guiding device (3) is in transmission connection with an A motor (4) and can adjust circumferential gestures under the driving of the A motor (4), the flow guiding device (3) is of an X shape and consists of two flow guiding sheets (31) which are intersected with each other, the impeller (2) comprises a mounting disc (21) and a mounting ring (22) which are distributed oppositely, and a rectifier arranged between the mounting disc (21) and the mounting ring (22), the rectifier consists of a group of rectifying sheets (23) which are distributed at intervals along the circumferential direction of the impeller (2), micropores are formed in the surface of the rectifying sheets (23), two ends of the rectifying sheets (23) are fixedly connected with the mounting disc (21) and the mounting ring (22) respectively, a shaft sleeve (24) used for connecting an output shaft of the B motor (5) is arranged in the middle of the mounting disc (21), and the rectifying sheets (31) are arc-shaped.
  2. 2. The multi-wing centrifugal fan outlet composite guide device according to claim 1, wherein the two guide vanes (31) are of a long-short structure, wherein the inner end of the longer guide vane (31) points to the volute (1), and the inner end of the shorter guide vane (31) points to the impeller (2).
  3. 3. The multi-wing centrifugal fan outlet composite flow guiding device according to claim 2, wherein the inner end of the flow guiding sheet (31) is provided with a streamline end head (311) in a sharp angle shape.
  4. 4. The multi-wing centrifugal fan outlet composite guide device according to claim 3, wherein the surface of the guide vane (31) is coated with a super-hydrophobic nano coating.
  5. 5. The multi-wing centrifugal fan outlet composite flow guiding device of claim 1, wherein the porosity of the surface of the rectifying sheet (23) is 25% -40%, and the aperture of the micropore is 0.4-0.8 mm.
  6. 6. The multi-wing centrifugal fan outlet composite guide device according to claim 5, wherein the thickness of the rectifying sheet (23) is 1/9~1/12 of the thickness of the volute (1).
  7. 7. The multi-wing centrifugal fan outlet composite flow guiding device according to claim 1, wherein the rectifying piece (23) comprises a rectifying piece body (231) and mounting parts (232) arranged at two ends of the rectifying piece body (231), the mounting parts (232) are welded with the outer side faces of the mounting ring (22) and the mounting disc (21), two end parts of the rectifying piece body (231) are located at two side positions, one limiting protrusion (233) is respectively arranged, and the limiting protrusions (233) are located at the inner sides of the mounting ring (22) and the mounting disc (21).
  8. 8. The multi-wing centrifugal fan outlet composite guide device of claim 7, wherein the mounting portion (232) is composed of two mounting blocks which are distributed at intervals, and an included angle between axes of the two mounting blocks is an acute angle.
  9. 9. The multi-wing centrifugal fan is characterized in that the multi-wing centrifugal fan outlet composite flow guiding device is adopted.
  10. 10. A multi-wing centrifugal fan according to claim 9, wherein, in operation, the angle between the line between the centre point of the deflector (3) and the centre point of the impeller (2) and the bisector of the acute angle formed by the two deflectors (31) is According to the real-time flow at the inlet of the fan The determination is as follows: ; Wherein, the For the flow at the inlet of the fan to be rated flow Maximizing fan outlet flow rate when The value is taken out, Is the upper limit value of the flow rate at the inlet of the fan, Is the lower limit value of the flow at the inlet of the fan, 、 The flow rates at the inlet of the fan are respectively Maximizing fan outlet flow rate when And (5) taking a value.

Description

Multi-wing centrifugal fan outlet composite flow guiding device and multi-wing centrifugal fan Technical Field The invention belongs to the field of fluid machinery, and particularly relates to a multi-wing centrifugal fan outlet composite flow guiding device and a multi-wing centrifugal fan provided with the same. Background The multi-wing centrifugal fan is a centrifugal fan which adopts forward bending blades, has a plurality of blades and a compact impeller structure, and is widely applied to air conditioning, ventilation and cooling equipment at present. However, the internal flow field of the ① impeller has the obvious defects that under the working condition of small flow, the static pressure gradient of the volute outlet is insufficient to cause air flow to flow backward to an impeller inlet to form local vortex, the acting efficiency of the impeller is reduced, the flow rate of the fan outlet is further reduced, the flow separation in ② impeller channels is realized, when the attack angle of the air flow is overlarge, the rear edge of the suction surface of the blade is easy to generate boundary layer separation to form vortex and block the impeller channels, the flow loss is further reduced, the flow rate of the fan outlet is further reduced, the vortex in the ③ fan cover is generated, the pressure distribution of the flow field between the impeller and the volute is uneven, spiral flow is generated when the air flow turns at a large angle, secondary flow and backflow are induced, and the flow resistance and noise are increased. In the prior art, in order to overcome the defects, some manufacturers install a rectifying plate in the interior of the volute or at the outlet of the volute to guide airflow, divide large-scale vortex and inhibit flow separation, or offset the center of the impeller relative to the center of the volute (eccentric design) to optimize flow field pressure distribution between the impeller and the volute. However, the existing rectifying plate can divide vortex, but increases flow loss, and the eccentric impeller design can optimize flow field, but easily causes uneven volute tongue clearance, and causes efficiency fluctuation and noise rise. Disclosure of Invention The invention provides a multi-wing centrifugal fan outlet composite flow guiding device which is used for overcoming the problems in the prior art. The invention relates to a multi-wing centrifugal fan outlet composite flow guiding device, which guides air flow by arranging an X-shaped flow guider at the outlet section of a volute, can effectively inhibit flow separation and reduce flow loss, thereby improving fan outlet flow, and the flow guider can adjust circumferential gestures according to working conditions, optimize impeller outlet air flow distribution and reduce air flow impact, thereby effectively reducing flow loss and improving fan operation efficiency. Correspondingly, the invention also provides a multi-wing centrifugal fan provided with the outlet composite flow guiding device. For the outlet composite flow guiding device, the technical scheme of the application is as follows: The multi-wing centrifugal fan outlet composite flow guiding device comprises a volute and an impeller arranged in the volute, wherein a flow guiding device is arranged at an outlet section of the volute and is in transmission connection with an A motor, the flow guiding device can adjust circumferential postures under the drive of the A motor, the flow guiding device is of an X shape and consists of two flow guiding sheets which are mutually intersected, the impeller comprises a mounting disc and a mounting ring which are distributed oppositely, and a rectifier arranged between the mounting disc and the mounting ring, the rectifier consists of a group of rectifying sheets which are distributed at intervals along the circumferential direction of the impeller, micropores are formed in the surface of the rectifying sheets, two ends of the rectifying sheets are fixedly connected with the mounting disc and the mounting ring respectively, a shaft sleeve used for connecting an output shaft of a B motor is arranged in the middle of the mounting disc, and the flow guiding sheets and the rectifying sheets are arc-shaped curved surfaces. Compared with the prior art, the multi-wing centrifugal fan outlet composite flow guiding device can effectively improve the aerodynamic efficiency and the outlet flow through structural innovation and flow field optimization design, and reduce the operation noise of the multi-wing centrifugal fan; the application further discloses a device for guiding the airflow by arranging the X-shaped flow guide at the outlet section of the volute, which can effectively inhibit flow separation, reduce flow loss, improve the outlet flow of the fan, and the flow guide is connected with a motor, and can adjust circumferential gestures according to working conditions in the use process, optimize the airflow distribut