In the large system of car air conditioning, gas-saving valves play a crucial role. It is usually seen as a “sniff throat” and “total switch” for a refrigeration cycle system, which, although small in size, directly determines the cooling efficiency, energy consumption and working life of the compressor of air conditioning. For the owner, an in-depth understanding of this component is a critical step in mastering the maintenance and efficient use of air-conditioning systems。
In order to understand the effect of the gas-saving valve, it is necessary to first understand its location in the entire refrigeration cycle. In the vehicle air-conditioning pipeline, it is accurately installed on the pipeline between the condenser (high pressure area) and the evapoperator (low pressure area). High-temperature, high-pressure liquid refrigerants delivered from compressors encounter strong throttle resistance when passing through narrow valves of gas-saving valves. This physical constraint has led to a sharp decrease in the pressure and temperature of the refrigerant, which has suddenly turned into a low-temperature, low-pressure fog mixture, creating the necessary conditions for heat boiling within the evaporation unit. It can be said that the evaporation unit cannot effectively absorb the heat in the car without the throttle relief of the swelling valve。
In addition to the basic throttle-relief function, the more central function of the gas-saving door expansion valves is to regulate refrigerant flows based on the accuracy of the actual heat load. Automobile air-conditioning systems fluctuate significantly under different conditions. For example, when vehicles start air-conditioning immediately after sunbathing, the temperature in the car is extremely high, at which point the evaporation unit needs a large quantity of refrigerants to take the heat quickly; when the temperature in the vehicle is reduced to a given value, the flow of refrigerants should be reduced accordingly. An expansion valve (e. G. Thermal or electron expansion valve) with the ability to regulate automatically is capable of detecting the change in real time: when evaporation agents export at higher temperatures, the valves are automatically opened to increase the supply of refrigerants; conversely, when the temperature is lower, the valves are small and the flow is reduced. This dynamic balance mechanism ensures complete evaporation of refrigerants in evaporation units, avoids the risk of “liquid shock” from oversupply leading to liquid refrigerant recalcitrant compressors, and prevents reduction of refrigeration capacity and overheating of compressors due to inadequate supply, thereby achieving effective protection of compressors。
In practical applications, gas-saving valves are divided into two main categories: thermal and electronic. Thermal expansion valves rely on the temperature of the sensor to detect evaporation, act through mechanical structurally driven valves, are mature and reliable and are widely used in conventional fuel vehicles. The electrostatic expansion valves, on the other hand, use a step-by-step power drive, combined with multiple temperature and pressure sensor signals collected by the controller, to achieve a ms scale rapid response and very high accuracy flow control. The electro-inflation valve not only regulates the wider range, but also provides a significant energy-saving advantage in the variable-frequency compressor system, allowing air conditioners to keep their wind temperature constant and improve their comfort. Electronic expansion valves are becoming the dominant configuration for new energy models and medium- and high-end fuel vehicles in pursuit of greater energy efficiency and precision temperature control。
In day-to-day use, it is essential to maintain the good working state of the gas-saving valves. Any impurities, moisture or cryogenic poors of refrigerated oils may cause valve congestion or valve core-carbar decomposition, affecting normal flow and regulation functions, as a result of the sophistication of the internal pipes of air conditioning systems. Therefore, regular replacement of air-conditioning filters, maintenance of the condenser surface clean and ensuring that the system is dry and waterless are effective means of maintaining the precision of the expansion valve. Once a significant decrease in the cooling effect of air conditioners has been observed and the leakage of compressors and refrigerants has been eliminated, attention needs to be focused on the working state of the swelling valves. The detection of high and low pressure side values through a professional dmp allows a more accurate determination of whether they are in the best working space。
In general, the gas-resilient valve is a sophisticated component of the wind flow, pressure relief, flow reconciliation and protection of the system in a car air-conditioning system. It not only provides the required stress poor for the refrigeration cycle, but also ensures the efficiency and stability of the system through smart regulation. Understanding the working principles and maintenance points helps us to better understand and love the car-friendly “respiratory system” while enjoying the cooling car environment。
