Gas heating device and heating hot water supply system

Abstract

The invention discloses a gas heating device and a heating hot water supply system. The gas heating device comprises a gas furnace, a heating assembly, a hot water supply assembly, a water outlet switching valve, a water inlet switching valve and a circulating pump, wherein the gas furnace is provided with a main water outlet and a main water inlet, and the gas furnace is used for combusting gas to heat water input from the main water inlet and outputting hot water from the main water outlet; the heating assembly is provided with a heating water outlet pipe and a heating water return pipe; thehot water supply assembly is provided with a cold water inlet pipe, a zero-cold water return pipe, a water tank and a water pump, and the water tank is provided with a hot water outlet and a circulating water inlet; the water outlet switching valve is used for correspondingly connecting the circulating water inlet and the heating water outlet pipe with the main water outlet; the water inlet switching valve is used for correspondingly connecting the cold water inlet pipe, the zero-cold water return pipe and the heating water return pipe with the main water inlet; and the circulating pump is connected between the water inlet switching valve and the main water inlet. Water stored in an external water pipe is heated or buffered through the water tank, so that the starting and stopping frequency of the gas furnace is reduced, the fluctuation of the water outlet temperature is reduced, the gas consumption is reduced, and the water use experience of a user is improved.

Description

technical field [0001] The invention belongs to the technical field of heating furnaces, and in particular relates to a gas heating device and a heating and hot water supply system. Background technique [0002] At present, gas heating devices use gas as energy to heat water to achieve heating. With the advancement of technology, gas heating devices can also have the function of supplying domestic hot water to users at the same time. For example: Chinese Patent Application No. 201811537311.6 discloses a zero-cold water gas wall-hung boiler system. On the one hand, the system can meet the heating requirements in the room, and on the other hand, it can also realize zero-cold water hot water supply. However, in actual use, in order to achieve zero cold water, the cold water in the outlet pipe needs to be transported by the water pump from the return pipe to the gas furnace for heating and then re-delivered to the outlet pipe. However, due to the small amount of water stored in...

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Problems solved by technology

In the actual use process, in order to maintain the temperature of the water in the water pipe, the water in the pipe needs to be heated. When the water temperature reaches the preset temperature, the machine does not work. When the water temperature is lower than the preset water temperature, it needs to be reheated. , the water pump restarts, causing the machine to start repeatedly, which will affect the life of the gas furnace, and frequent starts will cause a waste of gas; because the zero-cooled water volume is small, when using combustion heating, the temperature is easy to overheat, and users have problems during use. The temperature of zero-cold water is quite different from the temperature to be used (cold and hot), resulting in an uncomfortable water experience

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