Igniting temperature control device of gas water heater

Abstract

The invention discloses an igniting temperature control device of a gas water heater.The device comprises a heat exchanger made of a stainless steel material, a burning device used for supplying high-temperature flue gas to the heat exchanger, a water channel communicated with the heat exchanger, a first temperature detection device arranged on the heat exchanger or the water channel and a controller; when the temperature detected by the first temperature detection device is lower than or equal to the first preset temperature or the lowering speed of the temperature detected by the first temperature detection device is higher than or equal to a first preset value, the controller controls the burning device to run in the state that the thermal bearing capacity requirement of the stainless steel heat exchanger is met.According to the igniting temperature control device of the gas water heater, the heat exchanger made of the stainless steel has the good thermal inertia and the excellent thermal insulation property, therefore, the burning device is started to perform heating when the igniting temperature control device of the gas water heater is in a halt mode, and it can be guaranteed that the heat exchanger is not failed while the anti-freezing effect is achieved.

Description

technical field [0001] The invention relates to a water heater, in particular to an ignition temperature control device for a gas water heater. Background technique [0002] Generally speaking, the ignition temperature control device of a gas water heater may include components such as a heat exchanger, a combustion device, and a controller. The combustion device can burn the combustible gas, and use the heat generated by the combustion to prepare the cold water into hot water through the heat exchanger. [0003] However, when the temperature of the external environment drops to a certain temperature, the ignition temperature control device of the gas water heater is often damaged due to the freezing of water in the heat exchanger or other components. [0004] In order to solve this technical problem, the measures in the prior art mainly include: [0005] Empty anti-freezing, that is, a drainage pipeline is set in the ignition temperature control device of the gas water he...

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Problems solved by technology

[0005] Empty anti-freezing, that is, a drainage pipeline is set in the ignition temperature control device of the gas water heater. When the temperature drops to a certain temperature, the controller controls the ignition temperature control device of the gas water heater to empty the water inlet and outlet pipes and heat exchanger through the drainage pipeline. low temperature water to achieve the purpose of antifreeze; this method needs to increase the drainage pipeline, and the structure is complicated;

[0006] Electric heating antifreeze, that is, electric heating rods are installed on the surface of the heat exchanger and / or the water inlet and outlet pipes. When the temperature drops to a certain temperature, the electric heating element is controlled to heat. In this way, only the electric heating element is used for heating. Uneven heating, poor antifreeze effect, and high power consumption

[0007] In addition, in the prior art, the heat exchanger in the ignition temperature control device of the gas water heater is at least partially made of copper. Due to the poor thermal inertia of the copper material, the heat exchanger made of copper within a certain period of time A certain amount of heat is applied to the heat exchanger, and its temperature change rate is relatively fast. Therefore, in the shutdown state, the heat exchanger made of copper has large temperature fluctuations when it is heated and is easily damaged.

On the other hand, the thermal conductivity of copper is relatively high (the thermal conductivity of copper is 16W / m*K). At low temperatures, heat exchangers made at least partially of copper are prone to freezing over a short period of time

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