Overtime and duty system of air conditioner

The utility model provides an overtime and duty system of an air conditioner. The overtime and duty system of the air conditioner is dedicated for duty (overtime) work when an operation range is lower than the minimum operation range of an air conditioning system. The overtime and duty system of the air conditioner is an improvement on a traditional cool storage system and basically different from the traditional cool storage system and comprises a cool/heat storage container, cool/heat medium conveying equipment, an intelligent controller, a self-control valve, a sensor, a thermal insulation pipeline and the like. A high temperature end and a low temperature end of the cool/heat storage container are connected with a cold/heat medium pipeline of an original air conditioning system. The overtime and duty system of the air conditioner can ensure that cold or heat can be supplied normally even when a cold or heat burden is lower than the minimum adjusting range of cool or heat source equipment, a use range of the original air conditioning system is enlarged, flexibility, reliability and adaptability of the air conditioning system in use are improved, compared with a traditional cool/heat storage system, instant cool or heat generation amount is small, a period of storing and releasing heat or cold is short, the cool/heat storage container is small in size and the overtime and duty system of the air conditioner aims at solving the problem that air conditioning equipment can not operate under a low burden so as to cause overtime without air conditioning and like with low cost.