Check valve, low-resistance exhaust device and range hood

Abstract

The invention provides a check valve, a low-resistance exhaust device and a range hood, and relates to the technical field of lampblack purification equipment, the check valve comprises a valve body, the valve body comprises a gradually-expanding section with the caliber gradually expanding outwards in the axis air outlet direction and a check valve straight pipe section with the caliber kept unchanged outwards in the axis air outlet direction; and the sections of the divergent section and the check valve straight pipe section are rectangular. The low-resistance exhaust device comprises a check valve. The range hood comprises the low-resistance exhaust device. By means of the check valve, the technical problems that the height of the check valve is about 100 mm, the local section changes fast, and losses are large are solved, and the technical effects of increasing the air volume and reducing noise are achieved.

Description

technical field [0001] The invention relates to the technical field of oil fume purification equipment, in particular to a check valve, a low-resistance exhaust device and a range hood. Background technique [0002] The range hood, also known as the range hood, is a kitchen appliance used to purify the kitchen environment. It can quickly suck away the exhaust gas generated by the stove combustion and the oil fume generated during the cooking process, and discharge it outdoors to purify the kitchen environment. the goal of. [0003] At present, most high-rise residential buildings use centralized smoke exhaust. The indoor range hood is connected to the public flue through a smoke pipe, check valve, so that the cooking fume in the kitchen is discharged into the public flue through the indoor range hood through the smoke pipe. [0004] In the prior art, the range hood generally discharges smoke vertically upwards, while the public flue is generally arranged on the left or righ...

AI Technical Summary

Problems solved by technology

[0006] 1. The airflow at the air outlet of the range hood needs to go through the diameter reduction of the check valve and the aluminum foil air duct to two positions with large pressure loss, resulting in loss of overall performance and high noise;

[0007] 2. Since the inner wall of the aluminum foil air duct has obvious wavy folds, the loss in this part is relatively large;

[0008] 3. Due to the insufficient rigidity of the aluminum foil air duct as a whole, it is easy to deform and displace, resulting in damage, increased resistance and abnormal sound

Images