Centrifugal fan, range hood with centrifugal fan and control method of range hood

Abstract

The invention discloses a centrifugal fan. The centrifugal fan comprises a volute, an impeller assembly aranged in the volute and a first motor for driving the impeller assembly, wherein an air inletis formed in the volute, the main motor is provided with a first output shaft, and the centrifugal fan is characterized in that the impeller assembly comprises a first impeller and a second impeller arranged coaxially in a spacing mode, the first impeller is close to the air inlet, the second impeller is arranged on the side, away from the air inlet, of the first impeller, the centrifugal fan further comprises a second motor, the secondary motor comprises a stator and a rotor arranged on the periphery of the stator so as to form an outer rotor motor, the stator of the secondary motor is connected with the first output shaft of the main motor, and the stator and the rotor of the secondary motor are respectively connected with one of the first impeller and the second impeller so that the first impeller and the second impeller can be driven to rotate. The invention further discloses a range hood with the centrifugal fan and a control method of the range hood.

Description

technical field [0001] The invention relates to a power device, in particular to a centrifugal fan, a range hood with the centrifugal fan, and a control method for the range hood. Background technique [0002] Since the range hood entered China in the 1990s, it has become an indispensable kitchen appliance for ordinary people. Its main function is to inhale the cooking fume generated by the user through the fan system impeller from the air inlet, use the air inlet filter and impeller to filter the fume, and discharge the filtered fume from the air outlet, thereby completing the purification of the kitchen environment. The fan impeller is the core component of the range hood. Reasonable configuration of its structure has an important impact on improving the effect of the range hood, reducing the escape of the range hood, and improving the air quality in the kitchen. [0003] Range hoods currently on the market generally adopt a single air inlet and single outlet structure, a...

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Problems solved by technology

The problems in this design are as follows: 1) For an impeller with a certain width, the flow at the air inlet 11' is almost unrestricted; for the place far away from the air inlet 11', due to the upper part (for ease of description, "upper" means Figure 10 The above and "bottom" shown refer to Figure 10 The impeller part shown below) has entrained most of the air, so most of it has a radial velocity, that is, the upper part of the air will no longer move downward when there is no pressure perpendicular to the radial direction, resulting in the dotted box It is difficult to supplement the air in the middle; 2) The air in the dotted box has a tendency to move upward due to the upper pressure reduction caused by the rotation of the upper impeller, which will offset part of the centrifugal force generated by the impeller in the dotted box, reducing the exhaust efficiency of this part of the impeller. Therefore, the ability to absorb and exhaust oil fume is weak, and the performance of the fan system is restricted, which affects customer experience

[0005] With the continuous improvement of the quality of life, range hood manufacturers are constantly pursuing large air volume and high wind pressure in order to obtain better range hood effects. Measures such as increasing the size of components such as motors and motors and improving the performance of the motors to obtain better oil absorption fume effects not only increase the cost, but also waste resources, and do not solve the fundamental problem. At the same time, if the size of the components increases, it will affect kitchen design

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