Railway vehicle air conditioner electric heating temperature protection device and method

Abstract

The invention discloses a railway vehicle air conditioner electric heating temperature protection device. The device is used for an overhead air conditioning unit and comprises a first temperature switch and a second temperature switch which are arranged in the air conditioning unit and located on one side of an electric heater, a current sensor which is arranged in an air conditioner control cabinet in a carriage and used for detecting the current of a ventilator in an air conditioning unit, and a shunt release which is matched with an electric heater circuit breaker connected with the electric heater. The first temperature switch, the second temperature switch, the current sensor and the electric heater circuit breaker are all connected with a controller arranged in the air conditioner control cabinet. In addition, the invention further discloses a rail vehicle air conditioner electric heating temperature protection method. According to the scheme, after secondary protection occurs,the fuse wire does not need to be replaced by climbing to the top, a thermal tripping device is added to the electric heating circuit breaker, an electric heating main loop power supply can be cut offby a hard wire, and during maintenance, only a control cabinet in a vehicle needs to be opened, and the circuit breaker needs to be reset.

Description

technical field [0001] The invention belongs to the technical field of rail vehicle air-conditioning systems, and in particular relates to a rail vehicle air-conditioning electric heating temperature protection device and a protection method. Background technique [0002] At present, the air-conditioning system for rail transit vehicles is equipped with an electric heater with a certain power according to the operating environment in order to meet the comfort requirements of passengers. Electric heaters are generally equipped with a temperature protection switch and a fuse for over-temperature protection. The entire air-conditioning system is equipped with an air differential pressure switch to detect whether the air-conditioning system is ventilated. Once there is no wind, the differential pressure switch will protect and control the shutdown of the electric heating to prevent fires caused by excessive temperature. [0003] At least the following technical problems exist i...

AI Technical Summary

Problems solved by technology

[0004] (1) The differential air pressure switch detects ventilation by detecting the air pressure through the pressure port. Different air-conditioning systems are affected by the system pressure and the installation position of the vehicle. The pressure port needs to be determined through tests, and inaccurate pressure often occurs.

[0005] (2) The fuse is installed on the electric heating, while the air conditioning unit is generally installed on the roof. Once a fuse occurs, it needs to be replaced on the top, which is poor in maintainability

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