Centrifugal fan and extractor hood applying centrifugal fan

A centrifugal fan and air inlet technology, which is applied in the field of centrifugal fans and range hoods, can solve problems such as increased leakage flow, easy generation of eddy currents, and decreased working ability of the impeller.

Active Publication Date: 2020-10-30
NINGBO FOTILE KITCHEN WARE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing multi-blade centrifugal fan system, since the air flow enters the volute from the axial direction, it needs to turn a relatively large angle to flow out from the radial direction of the impeller, which increases the degree of turbulence of the air flow; It is close to the front ring of the impeller, and the position between the two is prone to eddy currents, thus forming edge sounds (howling sounds are formed when the frequency is appropriate)
In addition, there are other problems in the cooperation between the collector and the impeller: when the axial clearance is t

Method used

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  • Centrifugal fan and extractor hood applying centrifugal fan
  • Centrifugal fan and extractor hood applying centrifugal fan
  • Centrifugal fan and extractor hood applying centrifugal fan

Examples

Experimental program
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Effect test

Embodiment 1

[0028] see figure 1 and figure 2 , a centrifugal fan that can be used as a power system for range hoods and other required fields. It includes a volute 1, an impeller 2 arranged in the volute 1 and a motor 3 for driving the impeller 2 to rotate. An air inlet 11 is formed on the volute 1 , and a current collector 4 is arranged at the air inlet 11 . The volute 1 includes a front cover 12 , a rear cover 13 , and an intermediate ring wall 14 arranged between the front cover 12 and the rear cover 13 . The above-mentioned air inlet 11 is opened on the front cover 12 .

[0029] see Figure 2 ~ Figure 4 The collector 4 includes a mounting portion 41 connected to the volute 1 and a guide portion 42 for guiding the airflow. The mounting portion 41 is arranged on the outside of the volute 1 (the side away from the impeller 2), which is annular, It is connected and fixed with the outer periphery of the air inlet 11 of the volute 1. The guide part 42 is hollow cylindrical, and a vent...

Embodiment 2

[0036] see Figure 6 and Figure 7 , in this embodiment, the difference from the above-mentioned first embodiment is that a protrusion 43 is provided inside the axial guide part 422, and there are at least two protrusions 43, along which the axial guide part 422 Circumferentially spaced, preferably evenly spaced, prevents air flow from fluctuating at the tail end of the collector 4 . As a result, the resistance on the inner wall surface of the axial guide part 422 is increased, the large eddy caused by the impact of wind speed is slowed down, the sound is more comfortable when the airflow passes by, and the airflow entering along the axial guide part 422 is better. Sort out.

[0037] On the airflow path, the width (dimension in the circumferential direction) of the protrusion 43 increases gradually, thereby forming the shape of a bullet, so that the wind on the wall-adjacent surface can flow in a natural streamlined flow, avoiding loss caused by hitting the protrusion 43 . ...

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Abstract

The invention discloses a centrifugal fan. The centrifugal fan comprises a volute and an impeller and a flow collector which are arranged inside the volute, wherein an air inlet is formed in the volute, the flow collector is arranged at the air inlet position, the impeller and the flow collector are provided with a common axis, the flow collector comprises an annular installation portion connectedwith the volute and a flow guide portion used for guiding airflow, the flow guide portion comprises a radial-direction flow guide portion extending inwards from the radial-direction inner side of theinstallation portion and an axial-direction flow guide portion penetrating through the air inlet to extend to the inner portion of the volute from the radial-direction inner side of the radial-direction flow guide portion, the impeller comprises a front ring, a rear ring and blades arranged between the front ring and the rear ring, the centrifugal fan is characterized in that in the axial-direction cross section of the flow collector, the axial-direction flow guide portion is a curve expanding to the radial-direction outer side gradually from one end connected with the radial-direction flow guide portion to the impeller direction, the end portion, connected with the front ring, of each blade is formed with a concave portion, and each concave portion is formed by concaving in the directionfrom the radial-direction inner side of each blade to the radial-direction outer side of each blade.

Description

technical field [0001] The invention relates to a power system, in particular to a centrifugal fan and a range hood using the centrifugal fan. Background technique [0002] The multi-blade centrifugal fan has the characteristics of high pressure and low noise. Therefore, the current society generally uses the multi-blade centrifugal fan system as the power source, and uses the high-speed rotating impeller to complete the two functions of acting and filtering in the volute. As it is commonly used in range hoods, the oil smoke is sucked and exhausted through the multi-blade centrifugal fan installed inside the range hood. The multi-blade centrifugal fan includes a volute, an impeller installed in the volute and a motor that drives the impeller to rotate. When the impeller rotates, the The center of the fan generates negative pressure suction, sucking the fumes under the range hood into the fan, and after being accelerated by the fan, it is collected by the volute and guided ou...

Claims

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Application Information

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IPC IPC(8): F04D17/16F04D25/06F04D29/44F04D29/42F04D29/28F04D29/30F04D29/66F24C15/20
CPCF04D17/16F04D25/06F04D29/441F04D29/4233F04D29/283F04D29/30F04D29/663F04D29/667F24C15/20
Inventor 胡承杰王伟张鲁涛
Owner NINGBO FOTILE KITCHEN WARE CO LTD
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