A hot water circulation device with a DC pump

Abstract

The invention discloses a hot water circulation device with a DC pump, comprising: a pipeline, a DC pump installed on the pipeline, a water flow sensor, and a controller connected with the DC pump and the water flow sensor; it is characterized in that its The control method is as follows: 1) Determine the water flow rate of the DC pump during the start, cycle, and post-cycle of the water heater preheating cycle; 2) Calculate the corresponding Frequency given value fstart, f cycle, f post cycle, where a is 10.28; 3) The controller controls the operating speed of the DC pump in a closed loop according to the frequency value fed back by the water flow sensor and the frequency given value. The invention adopts the output frequency of the water flow sensor to perform closed-loop control, and has the characteristics of simple control and high reliability. At the same time, the DC pump is used to carry out post-circulation under the premise of avoiding the restart of the water heater, and the temperature uniformity of the pipeline is better after the circulation is completed.

Description

technical field [0001] The invention relates to the technical field of water heater control, in particular to a hot water circulation device with a direct current pump. Background technique [0002] When the gas water heater stops using hot water, its burner usually does not work, so the water in the pipeline will cool down quickly. In order for the gas water heater to release hot water at any time, a circulation loop is usually installed between the hot water outlet end and the cold water inlet end of the gas water heater, and a hot water circulation device is connected in series on the circulation loop. [0003] However, in the existing home decoration structure, the position of the gas water heater is usually not reserved for a special circulation pipeline, resulting in that the preheating cycle cannot be performed. Although some gas water heaters can use the cold water pipe at the water point as a circulation loop, because most of the current hot water circulation devic...

AI Technical Summary

Problems solved by technology

[0003] However, in the existing home decoration structure, the position of the gas water heater is usually not reserved for a special circulation pipeline, resulting in the inability to perform a preheating cycle.

Although some gas water heaters can use the cold water pipe at the water point as a circulation loop, because most of the current hot water circulation devices use AC pumps, it is difficult to adjust the speed. After that, the temperature uniformity is poor

Images