Heating loop fault judging method

Abstract

The invention discloses a heating loop fault judging method. A heating loop is provided with a circulating pump, and the method is characterized in that the heating loop is provided with a differential pressure device at the water outlet end of the circulating pump, the differential pressure device is provided with a water inlet port, a water outlet port and a tapered section located in the middle, the caliber of the tapered section is gradually reduced from the water inlet port to the water outlet port, a pressure sensor is arranged on the differential pressure device, the signal output end of the pressure sensor is connected with a controller, and the controller determines a fault according to the differential pressure value. The differential pressure device is used for judging the flowcondition of the heating water path, whether the heating circulation pump is normally operated or not can be known, whether air in the waterway is too large or not can be judged, or whether the waterpath is blocked or not can be judged, and great convenience is brought to subsequent fault judgment and maintenance.

Description

technical field [0001] The invention relates to a heating furnace, in particular to a fault judgment method in a heating circuit. Background technique [0002] There is a closed heating waterway in a gas-fired water heater or a gas-fired heating furnace. Generally, a circulating pump is required in the heating furnace to promote the flow of the waterway, so as to realize the circulation heating of the heating water. [0003] When the heating circulation pump uses an AC motor, it is impossible to provide any signal feedback on whether the circulation pump is running. However, if the circulation pump is stuck, the heating furnace will enter normal heating combustion due to no operation feedback, but the circulation pump is stuck, and there is no water flow in the heating waterway, and the flame will burn through the heat exchanger at this time. [0004] In order to avoid safety accidents in this case, some manufacturers just use the temperature relay on the heat exchanger for...

AI Technical Summary

Problems solved by technology

But the flip switch has the following disadvantages: First, there are too many impurities in the heating waterway, and the flip switch is a moving part, which is easy to get stuck in this case, so the life is not long; secondly, the flip switch is stuck when it is opened state, the controller will make a misjudgment, thinking that there is always water flow in the heating waterway, and the circulating pump is always in the running state.

That is, the situation of false water flow; finally, the resistance of the flap switch to the waterway is relatively large, resulting in the ineffective loss of energy of the circulating pump

[0006] In addition, if the Venturi flow sensor is used, the cost is high, and two pressure sensors are required; so there needs to be a more effective way to solve this problem

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