A range hood with double fans in series

Abstract

A range hood with double fans in series, including a fan casing, a fan system is arranged in the fan casing, the fan system includes a first-stage centrifugal fan and a second-stage centrifugal fan, and the second-stage centrifugal fan is arranged on the first-stage Above the centrifugal fan, the first-stage centrifugal fan and the second-stage centrifugal fan are connected through a connecting pipe. The helical direction of the volute of the first-stage centrifugal fan is opposite to that of the second-stage centrifugal fan. A baffle is provided on the side of the air inlet away from the second air outlet of the secondary centrifugal fan, and one side of the connecting pipe is connected and sealed with the side of the baffle. By setting the opposite spiral direction and setting the baffle, the outlet airflow of the first-stage centrifugal motor can enter the air inlet area of ​​the second-stage centrifugal fan more easily, preventing the airflow from turning and separating in the connecting pipe, and reducing the internal resistance. The noise is reduced and the sound quality is improved; at the same time, the airflow direction is straight through, which reduces the length of the connecting pipe.

Description

technical field [0001] The invention relates to the field of range hoods, in particular to a serial double-fan type range hood. Background technique [0002] The fume absorption effect of a range hood mainly depends on the flow rate it can discharge under the condition of use. The larger the flow rate, the better the fume absorption effect. The discharge flow of the range hood in use depends mainly on the wind pressure of the range hood fan system, the greater the wind pressure, the greater the discharge flow. The wind pressure of the range hood fan system depends on the motor power of the fan system. The greater the motor power, the greater the wind pressure of the fan system. When ordinary household range hoods are in use, the oil fume needs to be discharged through the exhaust pipe, check valve, and exhaust channel. The use of these resistance devices makes the oil fume have a certain back pressure at the oil fume outlet. Presence can greatly affect the exhaust flow of ...

AI Technical Summary

Problems solved by technology

[0006] However, these existing inventions and designs simply combine the positions of the two-stage fan systems to complete the combination of different fans in the overall space, and have not solved the problem of the large sound and low sound quality of the range hood in this form from the principle and practice. bad question

The fundamental reason is that the existing technical solutions are likely to cause turbulence in the internal flow field of the system, resulting in poor sound quality of the range hood (sound is unstable, with alternating high and low waves), especially in an environment with low resistance. Larger, the sound quality is worse, causing some environmental resistance, causing users to be dissatisfied with the performance of this model

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