Constant-temperature type gas water heater and control method

Abstract

The invention discloses a constant-temperature type gas water heater. The gas water heater comprises a heat exchanger, a water inlet pipe, a water outlet pipe and a bypass pipe, wherein the water inlet pipe and the water outlet pipe are connected to the heat exchanger, and the bypass pipe is connected between the water inlet pipe and the water outlet pipe. The gas water heater is characterized in that a circulating pump and a one-way valve are arranged on the bypass pipe, a water storage tank is arranged on the water inlet pipe, and the one-way valve enables water to flow from a hot water pipe to a cold water pipe in one way. Compared with the prior art, not only can the influence of water stopping temperature rise after water is stopped in the bathing process and cold water in the secondary starting process on bathing be reduced, but also the problem that waiting is needed in the first time of use due to the water storage tank is solved; it is guaranteed that the temperature of outlet water meets the using requirement to the maximum extent, painful points in bathing are avoided, bathing comfort is effectively improved, and secondary hot water in bathing is free of waiting; meanwhile, water, gas, electricity, time and other precious resources are saved. The invention further discloses a control method for the constant-temperature type gas water heater.

Description

technical field [0001] The invention relates to the technical field of fluid heaters, in particular to a constant temperature gas water heater and a control method. Background technique [0002] 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 when the water point is far away from the water heater, the waiting time is longer, and it is even more unbearable in the cold season, which seriously affects the bathing comfort. At present, the water heater with ordinary structure cannot solve this bathing pain point. [0003] A Chinese invention patent with a publication number of 204648637U di...

AI Technical Summary

Problems solved by technology

The cold water in the closed circulation pipeline is circulated and heated through the circulating water pump and the bypass pipe. Although it can achieve the effect of no cold water when starting up, the following defects still exist: 1) Since the buffer water tank is located on the outlet pipe, when the water heater is used for the first time, The cold water in the buffer tank needs to be fully heated before it can be used, and the waiting time is long

Moreover, the cold water that flows in within 10 seconds of starting up flows into the heat exchanger immediately, which seriously affects the outlet water temperature. If the inlet water temperature is too low, the outlet water temperature will fluctuate greatly, and even cannot be used, and a real constant temperature cannot be achieved.

2) The circulating water pump is installed on the outlet pipe. To ensure the effect, a one-way valve needs to be connected in parallel, which is inconvenient to install.

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