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CN-224214449-U - High-speed centrifugal blower air inlet silencing structure

CN224214449UCN 224214449 UCN224214449 UCN 224214449UCN-224214449-U

Abstract

The utility model provides an air inlet silencing structure of a high-speed centrifugal blower, which comprises a side steel plate, wherein the side steel plate is multi-faceted and surrounds to form a polyhedral tubular structure, openings at two ends of the polyhedral tubular structure are respectively provided with a fixed shutter and a movable shutter, and a plurality of sound insulation plates are inwards extended from side walls and are arranged in the polyhedral tubular structure in a staggered manner. The utility model is based on the structure of staggering a plurality of sound insulation plates, so that high-speed air flow is subjected to repeated bending and silencing effects, thereby greatly improving the overall noise reduction effect, and the structure is concise, and effectively avoiding structural redundancy.

Inventors

  • ZHANG JIACHENG
  • Lu Shengce
  • Shan Zhongwu
  • WANG JIABIN
  • MENG DEJIAN
  • CHEN HUANXIN

Assignees

  • 贵州中航华强科技有限公司

Dates

Publication Date
20260508
Application Date
20250612

Claims (9)

  1. 1. The air inlet silencing structure of the high-speed centrifugal blower comprises a side steel plate (13) and is characterized in that the side steel plate (13) is multi-faceted and surrounds to form a polyhedral tubular structure, fixed shutters (11) and movable shutters (12) are respectively arranged at openings at two ends of the polyhedral tubular structure, and a plurality of sound insulation plates (21) are inwards extended from side walls and are arranged in the polyhedral tubular structure in a staggered mode.
  2. 2. The air intake silencing structure of high-speed centrifugal blower according to claim 1, wherein the sound insulation plate (21) is formed by filling rock wool (212) into a punched screen (211).
  3. 3. The intake silencing structure of a high-speed centrifugal blower according to claim 1, wherein the sound insulation plate (21) is obliquely installed and supported and fixed by a supporting frame (22).
  4. 4. A high-speed centrifugal blower intake silencing structure according to claim 3, wherein the sound insulation plate (21) is installed obliquely from the end of the fixed louver (11) to the end of the movable louver (12).
  5. 5. The air intake silencing structure of high-speed centrifugal blower according to claim 3, wherein the inclination angle of the sound insulation plate (21) is 5-20 degrees.
  6. 6. The intake silencing structure of a high-speed centrifugal blower according to claim 1, wherein the side steel plates (13) are internally filled with outer rock wool (14).
  7. 7. The intake silencing structure of a high-speed centrifugal blower according to claim 1, wherein the side steel plates (13) are four, and the polyhedral tubular structure is a rectangular tubular structure.
  8. 8. The intake silencing structure of a high-speed centrifugal blower according to claim 1, wherein the vanes of the fixed louver (11) and the movable louver (12) are opposite in direction.
  9. 9. The intake silencing structure of a high-speed centrifugal blower according to claim 1, wherein the direction of the sound insulation plate (21) is perpendicular to the direction of the blades of the stationary louver (11).

Description

High-speed centrifugal blower air inlet silencing structure Technical Field The utility model relates to an air inlet silencing structure of a high-speed centrifugal blower, and belongs to the technical field of centrifugal blower accessories. Background Because of the air compression effect, the high-speed centrifugal blower can generate aerodynamic noise during operation, wherein the most main noise comes from air inlet and outlet jet noise caused by air compression, and particularly when airflow at a volute tongue is suddenly diffused, the air inlet and outlet jet noise cannot realize silencing by directly modifying a high-speed blower structure, so that a silencing device is required to be additionally arranged at the position of an air inlet and outlet. The air intake and exhaust silencer in the prior art is generally a simple external relatively closed cavity, such as an integrated air exhaust silencing cavity and a refrigeration compressor disclosed in China patent with the application number of CN201621192806.6, and a double-screw blower air exhaust silencer with a heat insulation layer disclosed in China patent with the application number of CN 201821413450.3. By adopting the simple closed structure, although the noise reduction can be realized to a certain extent, the expected noise reduction effect is far short, and the noise of more than 100 dB can be reduced by 40 dB at most, so that the good noise reduction effect is realized in practice, the same silencer is installed in a multistage mode, and the multistage noise reduction is realized, so that the structure is extremely huge and redundant. Disclosure of utility model In order to solve the technical problems, the utility model provides the air inlet silencing structure of the high-speed centrifugal blower, which is based on a structure of staggeredly installing a plurality of sound insulation plates, so that high-speed air flow is subjected to multiple bending silencing effects, the overall noise reduction effect is greatly improved, the structure is simple, and structural redundancy is effectively avoided. The utility model is realized by the following technical scheme. The utility model provides an air inlet silencing structure of a high-speed centrifugal blower, which comprises a side steel plate, wherein the side steel plate is multi-faceted and surrounds to form a polyhedral tubular structure, fixed shutters and movable shutters are respectively arranged at openings at two ends of the polyhedral tubular structure, and a plurality of sound insulation plates are inwards extended from side walls and are arranged in the polyhedral tubular structure in a staggered manner. The sound insulation plate is formed by filling rock wool in the punching screen plate. The sound insulation board is obliquely installed and supported and fixed through the supporting frame. The sound insulation plate is obliquely arranged from the end of the fixed shutter to the end of the movable shutter. The inclination angle of the sound insulation plate is 5-20 degrees. And the side steel plates are internally filled with outer rock wool. The side steel plates are four, and the polyhedral tubular structure is a rectangular tubular structure. The vanes of the fixed blind and the venetian blind are opposite in direction. The direction of the sound insulation plate is perpendicular to the direction of the blades of the fixed blind. The utility model has the beneficial effects that the high-speed air flow is subjected to repeated bending and silencing effects based on the structure of the staggered installation of the plurality of sound insulation plates, so that the overall noise reduction effect is greatly improved, the structure is concise, and the structural redundancy is effectively avoided. Drawings FIG. 1 is a schematic structural view of at least one embodiment of the present utility model; FIG. 2 is a cross-sectional view taken along the A-A plane of FIG. 1; fig. 3 is a cross-sectional view of the B-B plane of fig. 1. In the figure, the shutter is 11-fixed, 12-movable, 13-side steel plates, 14-outer rock wool, 21-sound insulation plates, 211-punched screen, 212-inner rock wool and 22-supporting frames. Detailed Description The technical solution of the present utility model is further described below, but the scope of the claimed utility model is not limited to the above. The first embodiment of the utility model relates to an air intake silencing structure of a high-speed centrifugal blower, which is shown in fig. 1 to 3, and comprises a side steel plate 13, wherein the side steel plate 13 is in a polyhedral tubular structure formed by multi-surface surrounding, fixed shutters 11 and movable shutters 12 are respectively arranged at two ends of the polyhedral tubular structure, and a plurality of sound insulation plates 21 are arranged in the polyhedral tubular structure in a staggered manner and extend inwards from side walls. Thus, the air intake direction can b