grease pump

Abstract

The invention discloses a range hood, comprising: a frame, the frame has an air inlet and an exhaust port; a fan, the fan is arranged in the frame and has a volute, the volute The end surface is provided with an air inlet and the surrounding surface is provided with an air outlet connected to the exhaust port, and the volute is provided with an air passage chamber connected to the air inlet and the air outlet; the sound-absorbing component, the sound-absorbing The component is arranged on the inner wall of the frame and has an expansion surface facing the air inlet, and the distance between the expansion surface and the end surface of the volute is along the The air intake direction of the air port increases to define an expansion flow channel together with the end surface of the volute, and the expansion flow channel communicates with the air intake port and the suction port. According to the range hood of the present invention, by forming the expansion flow channel at the air intake front end of the air intake port with the flow area increasing 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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