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CN-122015150-A - Noise-reduction type range hood and noise-reduction design method thereof

CN122015150ACN 122015150 ACN122015150 ACN 122015150ACN-122015150-A

Abstract

The invention discloses a noise reduction type range hood and a noise reduction design method thereof, wherein the noise reduction type range hood comprises a shell, an air box and a volute arranged in the air box, the air box is provided with an inlet, a flow channel space is formed between the bottom of the volute and the inlet of the air box, the noise reduction type range hood also comprises a flow guide block, the flow guide block is arranged in the flow channel space and corresponds to the inlet of the air box, the flow guide block is of a structure of a flow separation boundary formed by the smoke fluid at the position of the inlet of the profiling air box due to section mutation and flow velocity mutation, the flow guide block is made of a sound absorption material, one surface of the flow guide block is a curved surface attached to the flow separation boundary, and the other surface of the flow guide block is attached to the inner wall of the air box. The invention can inhibit the turbulence of air flow, reduce pneumatic noise from the source, realize the integration of diversion and sound absorption, does not occupy a flow passage to ensure the air quantity, and has the advantages of noise reduction and oil smoke absorption efficiency, simple structure and easy cleaning and maintenance.

Inventors

  • YE JIAN

Assignees

  • 浙江帅康电气股份有限公司

Dates

Publication Date
20260512
Application Date
20260210

Claims (10)

  1. 1. The noise-reducing type range hood comprises a shell, a bellows and a volute arranged in the bellows, wherein the bellows is provided with an inlet, a flow passage space is formed between the bottom of the volute and the inlet of the bellows, and the noise-reducing type range hood is characterized by further comprising a flow guide block which is arranged in the flow passage space and corresponds to the inlet of the bellows, the flow guide block is of a structure of a flow separation boundary formed by the smoke fluid at the inlet of the profiling bellows due to section mutation and flow velocity mutation, the flow guide block is made of a sound absorption material, one surface of the flow guide block is a curved surface attached to the flow separation boundary, and the other surface of the flow guide block is attached to the inner wall of the bellows.
  2. 2. The noise reduction type range hood according to claim 1, wherein the shape of the flow guide block is a curve structure of a fitting flow separation boundary formed by fitting a plurality of fitting points, and the number N of the fitting points is more than or equal to 4.
  3. 3. The noise reduction type range hood according to claim 1, wherein the flow guide blocks are arranged on one side or two sides of the flow passage space, the flow guide blocks arranged on two sides respectively contour the flow separation boundary of the corresponding side of the flow passage space, and the joint surfaces of the two side flow guide blocks are respectively jointed with the inner wall of the corresponding side of the bellows.
  4. 4. The noise reduction type range hood according to claim 1, wherein the guide block is detachably connected with the inner wall of the bellows or integrally formed.
  5. 5. The noise reduction type range hood according to claim 1, wherein the surface of the guide block is covered with an oil fume prevention isolation layer.
  6. 6. The noise reduction type range hood according to claim 3, wherein the two-sided flow guide blocks are arranged, and the fitting points of the curved surfaces of the two-sided flow guide blocks are respectively arranged corresponding to the outlines of the flow separation boundaries at two sides of the flow passage space, and the number of the fitting points at two sides can be the same or different.
  7. 7. The noise reduction type range hood according to claim 3, wherein the fitting areas of the two side-arranged guide blocks and the inner wall of the bellows are adapted according to the coverage area of the corresponding side flow separation boundary, and the fitting areas of the two sides can be the same or different.
  8. 8. The noise reduction range hood of claim 2, wherein the fitting point comprises a start point, an end point, and an intermediate feature point of the flow separation boundary, the intermediate feature point being a plurality of feature positions of the flow separation boundary.
  9. 9. A noise reduction design method for a range hood, which is used for the noise reduction range hood according to any one of claims 1 to 7, and is characterized by comprising the following steps: S1, establishing a complete machine three-dimensional model of the range hood, solving and calculating a flow field at an inlet of an air box based on CFD simulation software, and outputting a speed vector diagram through post-processing to realize flow separation visualization caused by section mutation and flow velocity mutation; s2, reading coordinate parameters of a flow separation boundary from the velocity vector diagram, and fitting each coordinate point by adopting a spline curve tool of modeling software to generate an entity so as to obtain a three-dimensional model of the flow guide block; and S3, manufacturing a guide block object by adopting a sound absorption material according to the three-dimensional model of the guide block, and assembling the guide block object in a flow passage space between the bellows and the volute of the range hood.
  10. 10. The method for designing the noise reduction of the range hood according to claim 9, further comprising the step S4 of performing CFD simulation evaluation on the range hood after the flow guide block is assembled, and if the flow separation inhibition effect does not reach the preset requirement, returning to the step S2 to adjust the fitting point number or the fitting path until the preset requirement is met.

Description

Noise-reduction type range hood and noise-reduction design method thereof Technical Field The invention relates to the technical field of range hoods, in particular to a noise reduction type range hood and a noise reduction design method thereof. Background With the improvement of consumer living standard, silence experience has become the core of range hood and has been used the appeal, and bellows runner is as the key structure that influences range hood noise level, and its noise reduction optimal design becomes industry research focus. For the range hood with the upper fan, a flow passage space exists between the bottom of the volute and the inlet of the bellows, and the flow separation is triggered due to section mutation and flow velocity mutation easily occurring when flue gas fluid flows through the flow passage, so that pneumatic noise is generated, and various noise reduction optimization schemes are formed in the related fields. The most relevant prior art is the Chinese patent of the utility model of the grant bulletin number CN217274349U, the patent discloses a noise reduction device of the air inlet area of the bellows of the range hood, the technical scheme is as follows: noise reduction plates with noise reduction holes are distributed in the inner wall area of the bellows at the air inlet side of the volute, sound absorption materials are filled in the plates, flow guiding is achieved through the appearance design of the noise reduction plates, and the noise reduction effect is achieved by combining the sound absorption effect of the sound absorption materials. The scheme tries to optimize the flow channel through a combined mode of flow guiding and sound absorbing, but has the obvious technical defects that firstly, a noise reduction plate structure with noise reduction holes is additionally arranged, the processing and assembly cost of parts is increased, the scheme is poor in economy and limited in popularization, secondly, the appearance design of the noise reduction plate is not accurately adapted to the specific boundary of flow separation at an air inlet, the flow separation caused by section mutation and flow velocity mutation cannot be effectively restrained or eliminated only through conventional structural optimization, so that the flow state of flue gas fluid entering a fan system is difficult to be effectively controlled, a pneumatic noise source is not reduced from the root, and the noise reduction effect is limited. Another related prior art is the chinese patent of the patent issued with publication number CN210601804U, which discloses a noise reduction type range hood, wherein a flow guiding block is disposed below a volute to divide a mounting cavity into two air inlet channels, so as to avoid the mutual interference of two air flows and realize noise reduction. But the diversion block of this scheme only realizes the reposition of redundant personnel through the simple structure that the width increases from bottom to top, does not consider the core problem of air intake department flow separation, does not carry out the profile modeling design based on flow field characteristic, can't solve the pneumatic noise that cross section abrupt change and velocity of flow abrupt change lead to, and noise reduction mechanism is single, and applicable scene is limited. In conclusion, the existing noise reduction scheme of the range hood is difficult to consider both the noise reduction effect and the economy because of higher cost and poor popularization or because of failing to accurately perform optimal design aiming at the flow separation phenomenon. Therefore, there is a need for a range hood noise reduction scheme that can fundamentally inhibit flow separation, has a controllable cost, and has a significant noise reduction effect, so as to meet industry development and user requirements. Disclosure of Invention The invention aims to solve the technical problem of providing the noise reduction type range hood and the noise reduction design method thereof, which can inhibit airflow turbulence, reduce pneumatic noise from a source, realize the integration of diversion and sound absorption, do not occupy a flow channel to ensure air quantity, and have the advantages of noise reduction and oil smoke absorption efficiency, and simple structure and easy cleaning and maintenance. In order to solve the technical problems, the first aspect of the invention discloses a noise reduction type range hood, which comprises a shell, an air box and a volute arranged in the air box, wherein the air box is provided with an inlet, a flow channel space is formed between the bottom of the volute and the inlet of the air box, the noise reduction type range hood further comprises a flow guide block which is arranged in the flow channel space and corresponds to the inlet of the air box, the flow guide block is of a structure of a flow separation boundary formed by the smoke fluid at the inlet of the pro