Intelligent hot water circulation system and control method thereof

Abstract

The invention relates to an intelligent hot water circulation system. The system comprises a heating and hot water dual-purpose gas furnace and a hot water circulation device; the dual-purpose gas furnace is provided with a heat supply outlet, a heat supply returning opening, a low-temperature inlet and a high-temperature outlet, wherein the heat supply outlet, the heat supply returning opening, the low-temperature inlet and the high-temperature outlet form heating circulation with a heat supply pipeline, the hot water circulation device internally comprises a water tank and is provided with alow-temperature inlet, a circulation outlet, a circulation inlet, a circulation water returning opening and a high-temperature outlet, the water tank is provided with a circulation opening, a water outlet and a cold water opening and is provided with an electric heating device and a water tank temperature sensor, the water outlet of the water tank passes through an electric three-way valve and isconnected with a water point through a hot water pipe, and the hot water pipe close to the water point is branched into a water returning pipe; signal output ends of a water tank temperature sensor,a pipeline temperature sensor and a flow sensor are connected with corresponding signal input ends of intelligent control devices in a control circuit, and corresponding control output ends of the intelligent control devices are connected with controlled ends of an electric three-way valve, a circulation pump and an electric heating deice. Heating after opening is achieved, and the phenomenon of frequent machine starting and stopping and heating breaking caused by short-time drainage can be effectively avoided.

Description

technical field [0001] The invention relates to a hot water system, in particular to an instant hot water circulation system, and provides a control method at the same time, belonging to the technical field of water heaters. Background technique [0002] There are the following problems in the use of heating-hot water dual-purpose gas boilers: 1) When the pipeline is long, you need to wait for the cold water in the pipeline to be released before adding hot water; 2) Turning on the hot water faucet will start the machine, resulting in operating noise , and affect the service life; 3) When heating in winter, releasing hot water will immediately interrupt the heating and affect the comfort of heating. [0003] In order to solve the problems existing in the above-mentioned prior art, the following two methods are mainly adopted for realizing instant heating in the current project: one is the hot water buffer method, that is, an insulated water tank is installed under the washbas...

AI Technical Summary

Problems solved by technology

[0002] There are the following problems in the use of heating-hot water dual-purpose gas boilers: 1) When the pipeline is long, you need to wait for the cold water in the pipeline to be released before adding hot water; 2) Turning on the hot water faucet will start the machine, resulting in operating noise , and affect life; 3) When heating in winter, hot water will immediately interrupt heating, affecting heating comfort

[0003] In order to solve the problems existing in the above-mentioned prior art, the following two methods are mainly adopted for realizing instant heating in the current project: one is the hot water buffer method, that is, an insulated water tank is installed under the washbasin, and cold water enters the water tank to mix with high-temperature water for buffering It will be used by users later. This method requires a large-volume water tank when the pipeline is long, and the installation space is limited. In addition, it is necessary to install an insulated water tank at each basin and other facilities to ensure that the corresponding faucet is hot when it is turned on. Gas cannot be avoided. The second is the circulation heating method, that is, the residual cold water in the hot water pipe is sent to the water heater by means of a pump to be heated and then supplied to the user. This method cannot solve the problems of intermittent cold and hot and frequent start and stop of the gas engine; It is a water tank circulation buffer heating method. A water storage tank is installed between the gas water heater and the water terminal. When a small amount of hot water is used, it is not necessary to start the water heater for heating. The water pump circulates between the water storage tank and the gas water heater to heat the water tank, and then circulates the hot water in the water storage tank to the water terminal through the pipeline circulating water pump, and the water terminal is used for instant heating. This method uses the water tank as a circulating heat source, and the circulation pipe It is limited by the volume of the water tank. When the volume of the water tank is too small, one cycle cannot meet the heating requirements of the pipeline circulation. The water tank needs to be heated before the pipeline can be recirculated to heat the pipeline. The cycle period is longer. If the design capacity of the water tank is too large, it will occupy the installation space. larger

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