Central hot water circulating system of gas water heater

Abstract

The invention discloses a central hot water circulating system of a gas water heater. The central hot water circulating system comprises the gas water heater, a cold water inlet pipe, a hot water outlet pipe, a plurality of water consumption points and cold water branch pipes, wherein the cold water inlet pipe and the hot water outlet pipe are connected to the gas water heater, the water consumption points are connected to the hot water outlet pipe, and the cold water branch pipes are connected between the water consumption points and the cold water inlet pipe; a hot water circulating device is connected between the hot water outlet pipe and the cold water branch pipe of the farthest water consumption point; the hot water circulating device comprises a connecting pipeline, a one-way valve, a circulating water pump, a temperature sensor and a controller, the one-way valve, the circulating water pump and the temperature sensor are serially connected to the connecting pipeline, the controller is in control connection with the circulating water pump and the temperature sensor, the water inlet end of the connecting pipeline is connected with the hot water outlet pipe, and the water outlet end of the connecting pipeline are connected with the cold water branch pipes. The central hot water circulating system has the advantages that the problem of excessively high temperature due to the fact that the hot water circulating device is mounted at the water inlet end is solved, the fact that water in the hot water pipe is hot and water in the cold water pipe is cold in an appointment time period and after preheating, and a user can use the hot water or the cold water according to needs immediately after the user turns on a water outlet valve.

Description

technical field [0001] The invention relates to the technical field of gas water heaters, in particular to a central hot water circulation system of a gas water heater. Background technique [0002] When the hot water circulation device in the prior art is installed without a return pipe, it is mostly installed at the water inlet end of the water heater, and a check valve is installed at the farthest end of the hot water pipe and the cold water pipe to connect the hot water pipe with the cold water To form a loop, there are about two working principles: [0003] 1) The user presses the preheating button, and the water pump in the circulation device starts to work. When the water heater detects the water flow signal and starts to burn, the circulation device detects that the water temperature reaches the preheating temperature set by the user, and the water pump stops working. [0004] 2) The user can set the preheating time of the hot water circulation device as long as t ...

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Problems solved by technology

[0006] 1) Since the hot water circulation device is installed at the water inlet end of the water heater, when the temperature judgment condition is adopted, when the temperature of the circulation device has not reached the set preheating temperature value, the temperature of the water outlet end of the water heater has far exceeded the preheating setting temperature, causing the temperature in the hot water pipe to overheat seriously, and the water cannot be mixed without a return pipe, and there is a risk of burns for the user taking a bath after the preheating is completed

[0007] 2) After the preheating is completed, the cold water pipe is filled with hot water, which not only wastes gas and electricity, but also a period of hot water will flow out after the preheating is completed, which will affect the user's use of cold water

[0008] 3) The warm-up time required by different users and different pipeline conditions is different. During the installation process, users and after-sales personnel need to repeatedly debug, and the installation and commissioning workload is heavy

[0009] 4) During the installation process, the circulation device is installed at the water inlet end of the water heater. Not only the pipeline at the farthest water point needs to be modified to install a check valve, but also the water circuit at the water heater inlet end needs to be rebuilt, which requires a large workload

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