Hot-water circulation device with direct current pump and control system thereof

Abstract

The invention discloses a hot-water circulation device with a direct current pump and a control system thereof. The hot-water circulation device is characterized by comprising a shell and further comprising a controller, a direct current water pump, a water inlet pipe joint, a circulating water flow sensor, a temperature sensor and a water outlet pipe joint which are arranged in the shell, wherein a water inlet of a water heater is connected with the water outlet pipe joint; the direct current water pump, the circulating water flow sensor and the temperature sensor are respectively arranged between the water inlet pipe joint and the water outlet pipe joint; the circulating water flow sensor and the temperature sensor are respectively connected with a signal input end of the controller; the controller is connected with and controls the direct current water pump to realize a stepless speed regulation function of the water pump; the controller also can feed back a rotating speed; the circulating water flow sensor is used for supplying a control signal for the stepless speed regulation of the water pump; the temperature sensor is used as a temperature judging condition for system anti-freezing, preheating start and preheating stop; and the water inlet pipe joint is externally connected with a water return pipeline. According to the invention, the phenomenon of over-shoot system temperature can be avoided; the energy resource can be saved; and compared with the similar products, the hot-water circulation device has the advantage of more excellent performances.

Description

technical field [0001] The invention relates to the technical field of water heaters, in particular 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 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 i...

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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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