Gas water heater

Abstract

The invention discloses a gas water heater. The heater comprises: a shell, wherein a containing cavity is defined in the shell, and the shell has a water inlet interface and a water outlet interface; a catalytic combustor, wherein the catalytic combustor is arranged in the containing cavity, a premixing cavity is defined in the catalytic combustor, the catalytic combustor is provided with an air inlet and an air outlet which are communicated with the premixing cavity, a catalyst is arranged at the air outlet, and the catalyst is constructed to conduct continuous combustion when the temperature exceeds the preset temperature and fuel gas and air are supplied; a fan, wherein the fan is communicated with the air inlet so as to convey air to the premixing cavity; a gas proportional valve, wherein an outlet of the gas proportional valve is communicated with the gas inlet so as to convey gas to the premixing cavity; and a heat exchanger, wherein the heat exchanger is arranged above the combustor and connected with the combustor so as to absorb heat generated by combustion of the combustor. According to the gas water heater, the structure is simple and compact, the size is small, the content of carbon monoxide and nitric oxide in smoke generated after combustion is low, energy is saved, environment friendliness is achieved, and working noise is low.

Description

[0001] This application is a divisional case with the filing date of "2016-09-30", the application number of "201610871768.5", and the application name of "Gas Water Heater" technical field [0002] The present invention relates to the technical field of water heaters, in particular to a gas water heater. Background technique [0003] The main combustion method adopted by the burner is flaming combustion, that is, the gas and air are not pre-mixed in the combustion device, but the gas and air are sent into the combustion chamber separately, and burned while mixing in it, and the flame produced by combustion It is longer and has a sharp outline. Due to the high activation energy of flaming combustion, the combustion speed is slow and the combustion is incomplete, resulting in a decrease in thermal efficiency. In addition, the gas radiation of the flaming combustion flame is small, and the main heat transfer method is convective heat transfer, which is easy to reduce the utili...

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Problems solved by technology

[0003] The main combustion method adopted by the burner is flaming combustion, that is, the gas and air are not pre-mixed in the combustion device, but the gas and air are sent into the combustion chamber separately, and burned while mixing in it, and the flame produced by combustion It is longer and has a sharp outline. Due to the high activation energy of flaming combustion, the combustion speed is slow and the combustion is incomplete, resulting in a decrease in thermal efficiency

In addition, the gas radiation of the flaming combustion flame is small, and the main heat transfer method is convective heat transfer, which is easy to reduce the utilization rate of energy

[0004] Furthermore, due to differences in the contact between different parts of the combustion and the air, it is easy to cause the completeness and temperature of the combustion to be different. In the high temperature area, due to the high temperature, it is easy to cause the generation of NOx pollutants; Incomplete, easy to produce harmful substances such as carbon monoxide, hydrocarbons and tar

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