Fuel gas premixer and fuel gas heating water heater thereof

Abstract

The invention discloses a fuel gas premixer and a fuel gas heating water heater thereof. The fuel gas premixer comprises a premixing outer pipe and a premixing inner pipe, and the premixing outer pipe is provided with a fuel gas connector; the premixing inner pipe comprises a contracted pipe section, a throat pipe section, a mixing section and an expanded pipe section; a fuel gas premixing inlet hole communicated with the fuel gas connector is formed in the mixing section; the minimum inner diameter of the pipe expanding section is larger than the inner diameter of the mixing section. According to the fuel gas premixer, through cooperation of the premixing outer pipe and the premixing inner pipe, air enters the mixing section from the contracted pipe section of the premixing inner pipe, fuel gas enters a cavity formed by the premixing outer pipe and the premixing inner pipe from the fuel gas connector of the premixing outer pipe, and then the air and the fuel gas are mixed in the mixing section according to the proportion; the mixed gas enters the fan through an outlet of the premixing outer pipe and is fed into the combustor for combustion, so that the mixing proportion of the fuel gas and the air is reasonable, the combustion in the combustor is stable, and the phenomena of flameout or detonation and the like are avoided during full-load operation or low-load operation.

Description

technical field [0001] The invention relates to the technical field of premixers, in particular to a gas premixer and a gas heating water heater thereof. Background technique [0002] The fully premixed gas heating water heater generates negative pressure in the premixer through the rotation of the fan before the gas is burned, and sucks the air inside the heating furnace into the premixer. At the same time, the gas proportional valve is opened and the gas enters the premixer. to achieve proportional premixing of gas and air in the premixer. The combustion of full premixed burners is not limited by mixing time and mixing space, and has the advantages of fast combustion speed, sufficient combustion, low nitrogen oxide emissions, and low noise. It has been used more and more, especially in condensing water heaters and Condensing on the stove. [0003] At present, the traditional premixer has the following problems: the mixing ratio of gas and air is unreasonable, resulting i...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art, one of the purposes of the present invention is to provide a gas premixer to solve the above-mentioned traditional problems, which can make the mixing ratio of gas and air reasonable, and the combustion is stable. During operation, there will be no flameout or deflagration

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