grease pump

Abstract

The invention discloses a range hood, comprising: a frame; a fan, the fan includes a volute and a driving part, a first end surface of the volute is provided with a first air inlet and a second end surface is provided with a second air inlet, The volute has an air passing chamber that communicates with the first air inlet and the second air inlet, the driver is arranged at the second air inlet and the peripheral surface of the volute is provided with an air outlet that communicates with the exhaust port and the air passage chamber The volute is arranged obliquely relative to the vertical centerline of the frame so that the first end surface of the volute and the first inner wall of the frame jointly define an expansion channel, the expansion channel communicates with the first air inlet and the suction port and The flow area increases along the air intake direction from the suction port to the air passage chamber; at least one sound-absorbing component is arranged on the first inner wall of the frame and / or the second inner wall of the frame. According to the range hood of the present invention, by forming an expansion flow channel at the front end of the air intake of the first air inlet, the flow area of ​​which increases along the air intake direction, the radiated noise from the inside of the frame to the outside can be effectively controlled.

Description

technical field [0001] The invention relates to the technical field of kitchen equipment, in particular to a range hood. Background technique [0002] The range hood in the related art is more and more developed towards the direction of large air volume, high wind pressure, and low noise (ie mute). Generally, there are two ways to optimize noise in range hoods: active noise reduction and passive noise reduction. Due to factors such as simple structure and low cost, passive noise reduction methods are more and more used. [0003] For example, a sound-absorbing baffle is provided in the frame to form a flow channel that tapers from bottom to top, so as to reflect downwardly the radiated noise from the air outlet of the volute. However, this sound-absorbing structure still has reflected noise, and the tapered flow channel forms a downward bell mouth, and the bell mouth faces the suction port of the frame, so that the noise can be diffused outward through the deflector, causing...

AI Technical Summary

Problems solved by technology

However, this sound-absorbing structure still has reflected noise, and the tapered flow channel forms a downward bell mouth, and the bell mouth faces the suction port of the frame, so that the noise can be diffused outward through the deflector, causing noise increase

Another example is to install sound-absorbing modules with the same cross-sectional area from top to bottom in the rack to form a flow channel with a constant flow area from top to bottom. Although this structure can weaken the noise radiated to a certain extent , but there is no reasonable guidance for the radiation noise, and there is still a part of the noise radiating from the inside of the rack

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