Zero cold water system and gas water heater

Abstract

The invention discloses a zero cold water system and a gas water heater. The zero cold water system comprises a water heater, a cold water pipe, a hot water pipe, a circulating pipe, a first adjustingmechanism and a second adjusting mechanism. The hot water pipe comprises an inner pipe and an outer pipe arranged in the inner pipe in a sleeved mode; an inner channel is formed in the inner pipe; anouter channel is formed between the inner pipe and the outer pipe; the inner channel and the outer channel are communicated at the end, away from the water heater, of the hot water pipe; the two endsof the circulating pipe are connected to the outer pipe and the cold water pipe respectively and communicated with the outer channel and the cold water pipe; and the first adjusting mechanism is arranged in the outer channel, and the second adjusting mechanism is arranged at the end, close to the hot water pipe, of the circulating pipe. When the temperature in the hot water pipe is lower than a threshold value of the first adjusting mechanism, the first adjusting mechanism adjusts the outer channel to be disconnected with the water heater, and the second adjusting mechanism adjusts the outerchannel to be communicated with the circulating pipe. The path of a circulation loop is short, the gas consumption of each circulation is reduced, and the self-starting problem of the water heater iseffectively avoided.

Description

technical field [0001] The invention relates to a zero cold water system and a gas water heater. Background technique [0002] At present, the gas water heater with zero cold water function has the trend of popularization gradually. Zero cold water means that when the gas water heater is used, there will be hot water when the tap is turned on, which saves the time spent waiting for the cold water in the pipeline to be drained. [0003] Such as figure 1 Shown, the existing zero cold water circulation circuit is: cold water pipe 6 ', water heater water inlet, water heater 9 ', water heater outlet, hot water pipe 1 ', cold water pipe 6 '. The circulation loop is too long, and the gas consumption per cycle is large. [0004] The existing zero cold water system also has the problem of self-starting, that is, when cold water is used in the cold water pipe 6' (such as flushing the toilet), a part of the water flow is directly replenished from the water inlet end 61' of the cold ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defect that the circulation loop of the zero-cooling water system in the prior art is too long, resulting in a large cycle gas consumption, and to provide a zero-cooling water system and a gas water heater

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