Temperature-constant gas water heater

Abstract

The invention discloses a temperature-constant gas water heater which comprises a circulation heating system, wherein the circulation heating system comprises a circulation loop and a water outlet pipeline, wherein one end of the water outlet pipeline is connected with a water supply while the other end is connected with a water using point; a main heat exchanger used for heating circulating water in the circulation loop is arranged on the circulation loop; a secondary heat exchanger used for heating cold water in the water outlet pipeline is arranged between the circulation loop and the water outlet pipeline; a three-way valve is arranged on the circulation loop; a water inlet of the three-way valve is communicated with a water outlet of the main heat exchanger; one water outlet of the three-way valve is communicated with a heat medium inlet of the secondary heat exchanger while the other water outlet is communicated with the water using point. The temperature-constant gas water heater provided by the invention realizes the secondary heat exchange for the cold water in the water outlet pipeline through the main heat exchanger and the secondary heat exchanger, so that the problem of high-temperature scalding caused by excessive heating of the cold water is solved.

Description

technical field [0001] The invention relates to a gas water heater, in particular to a constant temperature gas water heater. Background technique [0002] At present, the vast majority of gas water heaters in the prior art use gas combustion to generate heat, and then directly heat the copper main heat exchanger, and the water flows through the main heat exchanger to be heated and supplied to the water point. The advantage of this gas water heater is that Simple structure, compact size, easy to install, but poor comfort, once the external conditions (cold water temperature, flow, gas pressure, strong wind, etc.) change, the water temperature should not be controlled; especially in summer, many households have low tap water flow (such as 4L / min), but the cold water temperature is high (such as 30 degrees), the minimum heating power of gas water heaters in the prior art is generally 5-6kW, after the water flow is heated by such a gas water heater, the outlet water temperatur...

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Problems solved by technology

[0002] At present, the vast majority of gas water heaters in the prior art use gas combustion to generate heat, and then directly heat the copper main heat exchanger, and the water flows through the main heat exchanger to be heated and supplied to the water point. The advantage of this gas water heater is that Simple structure, compact size, easy to install, but poor comfort, once the external conditions (cold water temperature, flow, gas pressure, strong wind, etc.) change, the water temperature should not be controlled; especially in summer, many households have low tap water flow (such as 4L / min), but the cold water temperature is high (such as 30 degrees), the minimum heating power of gas water heaters in the prior art is generally 5-6kW, after the water flow is heated by such a gas water heater, the outlet water temperature will reach about 49 degrees, which is already It is far beyond the normal temperature of 38-42 degrees for normal people to take a bath. If the water flow is smaller, the temperature of the water will be higher, and the risk of burns will easily occur

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