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CN-121993439-A - Centrifugal fan and noise reduction control method thereof

CN121993439ACN 121993439 ACN121993439 ACN 121993439ACN-121993439-A

Abstract

The invention provides a centrifugal fan and a noise reduction control method of the centrifugal fan, and relates to the technical field of centrifugal fans. The centrifugal fan comprises a centrifugal fan body. According to the centrifugal fan and the noise reduction control method thereof, the movable ring capable of independently translating along the axial direction of the air duct is arranged, and the angle of the silencing pipe arranged in the air duct wall is controlled in parallel, so that the dynamic adjustment of the silencing frequency band is realized. The novel self-adaptive noise reduction device effectively solves the key problem that the traditional fixed muffler cannot adapt to frequency drift of 'variable order noise' when a fan is in variable speed operation, enables the noise reduction module to actively track and aim at main noise components in the change, remarkably improves the overall noise reduction effect and adaptability under complex working conditions, constructs a closed-loop control system consisting of a front-end noise sensing unit, a central control unit and a tail-end mechanical adjusting device, adopts a multistage series modularized noise elimination structure, and highly integrates the self-adaptive noise reduction function in an air duct.

Inventors

  • LI JUN
  • WANG YING
  • CHEN ENFU

Assignees

  • 盐城钢鼎环保科技有限公司

Dates

Publication Date
20260508
Application Date
20251231

Claims (10)

  1. 1. A centrifugal fan, comprising: The centrifugal fan comprises a centrifugal fan body (1), wherein an air outlet of the centrifugal fan body is connected with a connecting pipe (2); The silencing cylinder is connected to one end, far away from the centrifugal fan body (1), of the connecting pipe (2) through the first mounting seat (3), and a second mounting seat (5) is arranged at one end, far away from the first mounting seat (3), of the silencing cylinder; the noise detection device comprises a plurality of groups of first sound transducers (6) arranged on the inner side wall of the first mounting seat (3) and a plurality of groups of second sound transducers (7) arranged on the inner side wall of the second mounting seat (5); A movable muffler arranged on the muffler cylinder, and The central control unit is electrically connected with the plurality of groups of first sound transmitters (6), the plurality of groups of second sound transmitters (7) and the movable silencing device.
  2. 2. The centrifugal fan according to claim 1, wherein the movable silencing device comprises a sliding rail (15), a movable ring (16) and a pen-type electric telescopic rod (18); The sliding rails (15) are arranged on the upper wall and the lower wall of the inner side of the outer cylinder (4) in pairs; The upper wall and the lower wall of the movable ring (16) are respectively provided with a sliding groove (1601), and the movable ring (16) is connected between a pair of sliding rails (15) in a sliding way through the sliding grooves (1601); The pen-type electric telescopic rod (18) is arranged on the inner side of the outer cylinder (4), and the end part of the extending shaft is fixedly connected with one axial end of the movable ring (16).
  3. 3. The centrifugal fan according to claim 2, wherein the wall of the inner cylinder (8) is provided with a silencing hole (9) along the axial direction; the movable silencing device further comprises a movable silencing pipe (11), a silencing branch pipe (12), a sleeve (13), a first rotating seat (10) and a second rotating seat (14); The movable silencing pipe (11) is rotationally connected to the outer wall of the inner cylinder (8) through the first rotating seat (10) and is communicated with the silencing hole (9); The silencing branch pipes (12) are distributed along the axial direction of the movable silencing pipe (11) and fixed on the outer wall of the movable silencing pipe, and an acute included angle is formed between the axial lead of the silencing branch pipes (12) and the axial lead of the movable silencing pipe (11); One end of the sleeve (13) is in sliding connection with one end of the movable silencing pipe (11) far away from the first rotating seat (10); The other end of the sleeve (13) is rotatably connected to the inner side wall of the movable ring (16) through the second rotating seat (14).
  4. 4. A centrifugal fan according to claim 3, wherein the inner cavity walls of the movable silencing pipe (11) and the silencing branch pipe (12) are attached with silencing cotton.
  5. 5. The centrifugal fan of claim 4, wherein the noise-reducing cotton is made of centrifugal glass cotton or hydrophobic rock cotton.
  6. 6. A centrifugal fan according to claim 3, wherein the first rotary seat (10) and the second rotary seat (14) are of spherical hinge structure or spherical bearing structure.
  7. 7. A centrifugal fan according to claim 3, wherein the angle between the axis of the silencing branch pipe (12) and the axis of the movable silencing pipe (11) is 45 degrees.
  8. 8. A centrifugal fan according to claim 3, wherein three silencing hole (9) arrays are sequentially arranged on the wall of the inner barrel (8) along the axial direction of the inner barrel, and three movable rings (16) and three pen-type electric telescopic rods (18) are correspondingly arranged.
  9. 9. A centrifugal fan according to claim 1, wherein the connecting pipe (2) is a square-round joint.
  10. 10. A noise reduction control method for a centrifugal fan, characterized by being applied to the centrifugal fan as claimed in any one of claims 1 to 9, comprising the steps of: S1, acquiring a noise signal acquired by the first sound transmitter (6) and a noise signal acquired by the second sound transmitter (7), and performing spectrum analysis on the noise signals; s2, determining the frequency of target order noise according to a frequency spectrum analysis result, and inquiring preset mapping relation data based on the frequency to obtain target displacement parameters of the corresponding movable ring (16); S3, controlling a corresponding pen-type electric telescopic rod (18) to drive the movable ring (16) to move according to the target displacement parameter so as to deflect the movable silencing pipe (11); S4, adjusting the displacement parameter of the movable ring (16) according to the change of the noise signal acquired by the second sound transducer (7).

Description

Centrifugal fan and noise reduction control method thereof Technical Field The invention relates to the technical field of centrifugal fans, in particular to a centrifugal fan and a noise reduction control method of the centrifugal fan. Background In recent years, with the continuous increase of demands of society for silencing industrial production, ventilation of buildings, and operation of home appliances, noise control technology of centrifugal fans as core power components has been developed. Early noise reduction means mainly rely on the addition of a resistive or resistive muffler with a fixed structure at the inlet and outlet of the fan and the laying of sound insulation materials outside the fan volute, and these passive methods play an important role in a certain period of time. With the maturation of Computational Fluid Dynamics (CFD) and computational acoustic (CAA) simulation technologies, noise reduction from the source by optimizing the aerodynamic design of impellers, volutes, etc. has become the dominant direction of industry development. Furthermore, the intelligent control system combining the sensor and the variable frequency speed regulator realizes that the high-noise working condition is actively avoided by adjusting the rotating speed of the fan, and marks that the fan is noise-reduced to enter an active adaptation stage. However, existing mainstream noise reduction schemes still have significant limitations in facing more complex and dynamic noise scenarios. The noise elimination frequency band and the noise reduction amount of the fixed muffler are determined in the design stage, once the fixed muffler is installed, the fixed muffler cannot be adjusted, the variable order noise generated by the change of the rotating speed of the fan and the fluctuation of the system load cannot be effectively treated, namely the core frequency component of the noise can be dynamically shifted along with the running condition, and the fixed muffler is often subjected to sharp reduction under the non-design frequency. The active noise control technology using sound to eliminate noise can respond dynamically, but has the advantages of complex system, high cost, limited treatment effect on broadband noise and complex sound field environment, and limited wide application in common industry and civil field. More critical is that no matter the source is pneumatically optimized or the tail end is additionally provided with noise elimination, the fan body and the noise reduction device are designed as relatively independent units in the prior art, and a modularized solution which can be tightly integrated in an air duct system, has a relatively simple structure and can adaptively track and restrain specific change noise in real time is lacked. Therefore, there is a need for improvements and optimizations in its structure in order to solve the above-mentioned existing problems. The novel noise reduction device should be capable of being directly embedded into an airflow channel of a fan and work as an intelligent module. It needs to have the ability to perceive the noise spectrum in real time and be able to dynamically change its own acoustic properties by means of an adjustable physical structure (rather than a complex sound field interference system) to precisely match and absorb the dominant order noise in the variation. The structural innovation aims to fill the gap between poor adaptability of the fixed muffler and overhigh cost of the advanced active noise reduction system, and provides a noise reduction means which has high reliability, quick response and is convenient to refit or integrate in the existing air duct system, so that stable and efficient noise suppression is realized under wider practical working conditions, and the centrifugal fan silencing technology is promoted to develop towards more intelligent and integrated directions. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a centrifugal fan and a noise reduction control method of the centrifugal fan, and solves the problems in the prior art. In order to achieve the purpose, the invention is realized by the following technical scheme that the centrifugal fan comprises: the air outlet of the centrifugal fan body is connected with a connecting pipe; the silencing barrel is connected to one end, far away from the centrifugal fan body, of the connecting pipe through a first mounting seat, and a second mounting seat is arranged at one end, far away from the first mounting seat, of the silencing barrel; the noise detection device comprises a plurality of groups of first sound transmitters arranged on the inner side wall of the first mounting seat and a plurality of groups of second sound transmitters arranged on the inner side wall of the second mounting seat; A movable muffler arranged on the muffler cylinder, and The central control unit is electrically connected with the plurality of groups of first so