Condensation type gas water heater and constant-temperature control method

Abstract

The invention discloses a condensation type gas water heater. The condensation type gas water heater comprises a first-level heat exchanger, a second-level heat exchanger, a water inlet pipe and a water outlet pipe. The first-level heat exchanger is a main heat exchanger for absorbing heat generated through direct combustion of a gas water heater combustor. The second-level heat exchanger is a condensation heat exchanger for absorbing waste heat in smoke. The first-level heat exchanger and the second-level heat exchanger are connected through a pipeline. The water inlet pipe is connected to the first-level heat exchanger, and the water outlet pipe is connected to the second-level heat exchanger. The condensation type gas water heater is characterized in that a bypass pipe is further connected between the water inlet pipe and the water outlet pipe and provided with a circulating pump and a one-way valve, and water flow is conducted in one direction from the water outlet pipe to the water inlet pipe through the one-way valve. The influences on bathing from water stopping temperature rise caused after water supply stopping in the bathing process and cold water in the secondary starting process can be reduced, zero waiting of secondary bathing hot water is achieved, and meanwhile water, gas, electricity and time are saved. The invention further discloses a constant-temperature control method of the condensation type gas water heater.

Description

technical field [0001] The invention relates to the technical field of fluid heaters, in particular to a condensing gas water heater and a constant temperature control method. Background technique [0002] Condensing water heaters are currently the most energy-efficient and environmentally friendly products. Compared with ordinary gas water heaters, condensing gas water heaters have an additional stage of condensing heat exchangers, which preheat cold water by absorbing high-temperature flue gas. With the improvement of living standards, users have higher and higher requirements for bathing comfort. In the process of using hot water, most users will turn off the water and take a bath. When it is turned on again, the high-temperature water caused by the temperature rise of the water stop and the cold water flowing in during the start-up process of the water heater cannot be used by users, and it takes a long time to wait. Especially for condensing gas water heaters, the wai...

AI Technical Summary

Problems solved by technology

Although this scheme can be used to automatically adjust the water distribution ratio of the first heat exchanger and the second heat exchanger, it can solve the problem of unstable water temperature when the water is turned on again in a short time after the water is turned off during the use of hot water. However, the structure is complex, the control is inconvenient, and it cannot solve the problem of waste of water resources

Images