Rail vehicle air conditioner electric heating temperature protection device and protection method

Abstract

The invention discloses an electric heating temperature protection device for an air conditioner of a rail vehicle, which is used for an overhead air conditioner unit. The current sensor in the air-conditioning control cabinet used to detect the current of the ventilator in the air-conditioning unit, the shunt release matched with the electric heater circuit breaker connected to the electric heater; the first temperature switch, the second temperature switch , current sensor and electric heater circuit breaker are all connected with the controller set in the air conditioning control cabinet. In addition, the invention also discloses a temperature protection method for the electric heating of the air conditioner of the rail vehicle. The scheme of the present invention does not need to go to the top to replace the fuse after the secondary protection occurs, and a thermal tripping device is added to the electric heating circuit breaker, which can cut off the main circuit power supply of the electric heating by hard wire, and only needs to open the inside of the vehicle during maintenance. Control cabinet, reset the circuit breaker.

Description

technical field [0001] The invention belongs to the technical field of rail vehicle air conditioning systems, and in particular relates to an electric heating temperature protection device and a protection method for rail vehicle air conditioners. Background technique [0002] At present, the air-conditioning system for rail transit vehicles will be equipped with electric heaters of a certain power according to the operating environment in order to meet the comfort requirements of passengers. Electric heaters are generally equipped with temperature protection switches and fuses for over-temperature protection. The entire air conditioning system is equipped with an air differential pressure switch to detect whether there is ventilation in the air conditioning system. Once there is no wind, the differential pressure switch will protect it and control the electric heating to stop, preventing fire caused by excessive temperature. [0003] There are at least the following techni...

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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