A staged combustion gas water heater and its control method

Abstract

The invention discloses a section combustion gas water heater and a control method thereof, which comprises a gas water heater body, a burner, a section valve, a gas passage, a gas proportional valve and a controller, the burner, the section valve, the gas Both the channel and the controller are set in the body of the gas water heater, and the gas proportional valve is set on the gas channel; the controller is electrically connected with the section valve and the gas proportional valve respectively, and is used to switch the fire gear of the gas water heater and adjust The current interval of the gas proportional valve when it is in any firepower gear. In this way, the present invention realizes the switching of the firepower gear through the controller to control the switch of the sectional valve, and uses the current linkage control method to limit different firepower gears to different gas The current range of the proportional valve widens the heat load overlapping range between the small firepower gear and the high firepower gear. The invention can effectively reduce the pressure of the water heater when it is off, and can still output constant temperature hot water when the air supply pressure is insufficient, improving the bathing experience.

Description

technical field [0001] The invention belongs to the technical field of gas water heater control systems, and in particular relates to a segmented combustion gas water heater and a control method thereof. Background technique [0002] The constant temperature gas water heater can output constant temperature hot water, greatly improving the comfort of bathing, and has become a mainstream product in the heating industry; a gas proportional valve is installed in the gas supply pipeline of the constant temperature gas water heater, and the gas proportional valve is electrically connected to the controller. It can automatically adjust the opening of gas flow according to the instructions of the control program, and control the size of the combustion firepower, so as to realize the constant temperature of hot water. [0003] At present, the constant temperature gas water heaters on the market generally adopt fire power segmented devices to reduce the minimum temperature rise and wi...

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Problems solved by technology

[0003] At present, the constant temperature gas water heaters on the market generally adopt fire power segmented devices to reduce the minimum temperature rise and widen the range of water temperature adjustment to meet the water temperature needs of users in different usage occasions, especially to solve the problem of high hot water temperature in summer; the water heater controller and strong suction electromagnetic The valve is electrically connected, and the control program command is output to open or close the valve to control the number of combustion fire rows, so as to realize the division of fire power. Insufficient gas supply pressure due to long or too small opening of the gas valve is prone to fire failure, and the outlet water temperature cannot be stabilized to the preset temperature, fluctuating from high to low, affecting the user's bathing experience

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