A hot water circulation device with direct current pump and its control system

Abstract

The invention discloses a hot water circulation device with a DC pump and its control system, which is characterized in that it comprises a housing and a controller arranged inside it, a DC water pump, a water inlet pipe joint, a circulating water flow sensor, a temperature sensor, The outlet pipe joint is connected to the water inlet of the water heater, the DC water pump, the circulating water flow sensor, and the temperature sensor are respectively arranged between the inlet and outlet pipe joints, and the circulating water flow sensor and the temperature sensor are respectively connected to the signal input end of the controller. The controller is connected to control the DC water pump to realize the function of stepless speed regulation of the pump, and has speed feedback; the circulating water flow sensor provides control signals for the stepless speed regulation of the water pump; the temperature sensor is used as the temperature judgment condition for system antifreeze, preheating start, and preheating stop ;Inlet pipe joint, externally connected to the return water pipe. The invention can avoid the phenomenon of overshooting the system temperature, fully save energy, and has superior performance compared with products of the same type.

Description

technical field [0001] The invention relates to the technical field of water heaters, and more particularly to a hot water circulation device and a control system thereof. Background technique [0002] At present, there are very few hot water circulation devices with DC pumps on the market, and the maturity of their control systems is not high. At present, the speed regulation of AC pumps used in large quantities is difficult and the realization cost is high. Therefore, AC pumps have not been adopted in the water heater industry. The method of speed regulation of the pump; many functions of the current hot water circulation device can only be used in the user's home with a return water pipeline, but the general user's home does not have a return water pipeline, and when some functions without a return water pipeline are actually used, The temperature uniformity is poor. In addition, the AC pump of the hot water circulation device has no speed regulation function. If it is cy...

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Problems solved by technology

[0002] At present, there are very few hot water circulation devices with DC pumps on the market, and the maturity of their control systems is not high. At present, the speed of AC pumps used in large quantities is difficult to adjust, and the implementation cost is high. Therefore, AC pumps have not been adopted in the water heater industry. The way of pump speed regulation; many functions of the current hot water circulation device can only be used in the user's home with the return water pipeline, but the general user's home does not have the return water pipeline, and when some functions without the return water pipeline are actually used, The temperature uniformity is poor. In addition, the AC pump of the hot water circulation device has no speed regulation function. If the circulation is performed at a normal speed, the water flow generated by the circulation will inevitably exceed the starting water flow of the water heater, and the water heater will re-ignite and burn, which will further aggravate the overtemperature phenomenon; therefore If there is no post-circulation, the water temperature in the pipeline will be extremely uneven. Since there is no return water pipeline, the fatal defect that the water point cannot use hot water normally. In addition, the relatively large AC pump also limits the compact design of the circulation device.

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