Method for safety monitoring of high-pressure storage and transportation mechanism of rail transit air-conditioning system
An air-conditioning system and rail transit technology, applied in the field of air-conditioning equipment for rail transit vehicles, can solve problems such as the decline in the high-temperature resistance of the unit, high dust content in the air, and dirty and clogged air-conditioning outdoor filters, so as to ensure reliability and safety. The effect of improving high temperature resistance and good safety guarantee
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Embodiment 1
[0033] In this embodiment, the rail transit air-conditioning system includes an evaporator 9, a compressor 1, a condenser 5, a dry filter 7, and a thermal expansion valve 8 that are sequentially connected into a main circuit, and the evaporator 9 and the condenser 5 are respectively equipped with evaporation Fan 10 and condensing fan 6, see figure 1 , critically, a high-pressure protection system for the high-pressure storage and transportation mechanism is set in the air-conditioning system. The automatic reset pressure switch 2, the needle valve 3 and the supporting management circuit connected by the high-pressure pipeline, one end of the bypass unloading branch is set between the compressor 1 and the condenser 5 of the air conditioning system, and the other end is set at the thermal expansion valve 8 and the evaporator 9, the pressure dividing branch switch valve 11 and the throttling capillary 12 are connected in series on the branch unloading branch.
[0034]The managem...
Embodiment 2
[0051] The difference from Embodiment 1 is that in this embodiment, a pressure sensor is installed outside the condenser 5 to detect the external environment pressure Pw near the condenser 5. The sum of the ambient pressure Pw is compared with the set dynamic high-pressure shunt unloading value Px and the dynamic limit value Pmax respectively. In step (2.1), when the internal pressure P of the high-pressure pipeline + the external environmental pressure Pw ≥ the dynamic high-pressure shunt unloading value Px, an instruction is issued Signal 11a, enter into shunt unloading mode. In the step (3.2), when it is detected that the internal pressure P of the high-pressure pipeline + the external environment pressure Pw ≥ the dynamic limit value Pmax, an instruction to stop the compressor 1 is issued. When the external ambient temperature Tw detects a high temperature above 80°C, the emergency pressure comparison measures are activated to prevent failures and personnel safety caused b...
Embodiment 3
[0054] Similar to Embodiment 1, in this embodiment, the fresh air temperature sensor used to detect the ambient temperature is used to trigger the primary high-voltage protection. The specific setting is that the fresh air temperature sensor used to detect the ambient temperature T is set in the external environment, and is connected Connect the signal input terminal of the integrated processor CPU, step (2.1) When T≥45°C is detected, the management circuit sends a command signal 11a to the switch valve of the partial pressure branch, opens the switch valve 11 of the partial pressure branch, and enters the split flow unloading mode , and also record the time point of entering the shunt unloading mode.
[0055] Step (2.2) When the T≤42°C management circuit cut-off command signal 11a is detected, the partial pressure branch switch valve 11 is closed, the air conditioning system is transferred to the normal full cooling mode, and the time point of exiting the split unloading mode ...
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