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汽车空调的高压性能受什么影响?

来源:http://www.sdjnltqf.com发布时间:2020-03-10 15:06:53

  高压是如何产生的?为了保证汽车空调的正常循环,蒸发和吸热的气态制冷剂必须重新转化为液态制冷剂,而液化(冷凝)是满足温度和压力两种条件所必需的。
  How is high pressure generated? In order to ensure the normal circulation of automobile air conditioning, the vaporized and heat absorbed gaseous refrigerant must be converted into liquid refrigerant again, and liquefaction (condensation) is necessary to meet the two conditions of temperature and pressure.
  温度条件:在冷凝过程中,气态制冷剂的温度必须降低到临界温度以下。例如,R134a的临界温度为101℃。在这个温度以上,压力太高而不能凝结。
  Temperature conditions: in the process of condensation, the temperature of gaseous refrigerant must be reduced below the critical temperature. For example, the critical temperature of R134a is 101 ℃. Above this temperature, the pressure is too high to condense.
  压力条件:冷凝过程中,系统必须保持一定的冷凝压力,否则无法实现冷凝。


  Pressure condition: in the process of condensation, the system must maintain a certain condensation pressure, otherwise condensation cannot be realized.
  蒸发后的气态制冷剂为低温低压制冷剂。此时,其温度满足冷凝要求,但其压力过低,无法满足再冷凝要求。所以我们要提高它的压强来满足冷凝压力的条件。压缩机是用来提高制冷剂压力的装置。
  The evaporated gaseous refrigerant is low temperature and low pressure refrigerant. At this time, its temperature meets the requirement of condensation, but its pressure is too low to meet the requirement of re condensation. So we have to increase its pressure to meet the conditions of condensation pressure. The compressor is a device used to increase the refrigerant pressure.
  压缩过程:压缩机的吸嘴吸入低温低压制冷剂,此时由于温度高于制冷剂蒸汽压缩机,压缩机将制冷剂,压缩机的热量和温度下降,但随着气体压缩,压缩腔气体温度急剧上升,在年底前压缩气体的温度远高于压缩机的温度,高温气体被送回压缩机,加热和暖化压缩机。气体在温度结束时的压缩受到以下因素的影响:1)压缩比,压缩率=排气压力/吸气压力)2)气体的绝热指数,气体的绝热指数是一个常数,由气体的性质决定的,绝热指数越高,越高排气温度(压力),如R22绝热指数高于一切,所以R22的排气压力3)吸气温度和冷凝压力高。气体制冷剂过热时,吸力温度较高。
  Compression process: the suction nozzle of the compressor sucks in low-temperature and low-pressure refrigerant. At this time, because the temperature is higher than that of the refrigerant steam compressor, the compressor will reduce the heat and temperature of the refrigerant and the compressor. However, as the gas is compressed, the temperature of the gas in the compression chamber rises sharply. Before the end of the year, the temperature of the compressed gas is much higher than that of the compressor, and the high-temperature gas is sent back to the compressor for heating and warming. The compression of gas at the end of temperature is affected by the following factors: 1) compression ratio, compression ratio = exhaust pressure / suction pressure) 2) adiabatic index of gas, the adiabatic index of gas is a constant, which is determined by the nature of gas. The higher the adiabatic index is, the higher the exhaust temperature (pressure) is. For example, the adiabatic index of R22 is higher than everything else, so the exhaust pressure of R22 is 3) high suction temperature and condensation pressure. When the gas refrigerant is overheated, the suction temperature is higher.
  如果制冷剂吸收的压缩机热量大于压缩结束时释放的热量,则压缩机温度下降,出现结霜现象。如果制冷剂对压缩机的吸热量小于压缩结束时放出的热量,则会导致压缩机温度升高,使压缩机产生高温热现象。
  If the heat absorbed by the refrigerant from the compressor is greater than the heat released at the end of compression, the temperature of the compressor will drop and frost will appear. If the heat absorbed by the refrigerant to the compressor is less than the heat released at the end of compression, the temperature of the compressor will rise, causing the compressor to produce high temperature heat.
  压缩机排出的高温、高压制冷剂气体,当进入冷凝器,由于温度较高,不符合冷凝温度条件,所以我不能很好的为液化凝结,冷凝器的传热在气相制冷剂,制冷剂温度下降,那么它将凝结成液体,电容器的体积减少,空间也相应减少。被占式冷凝器的相对减容过程也是一个相对压降的过程,散热和冷却的过程决定了这个过程的速度。冷凝量还是不够的,然而,还有一个因素决定了冷凝压力(高压),膨胀阀打开(按体积),因为从制冷剂压缩机排气口,膨胀阀的制冷剂液体放电是一种动态的平衡,如果开放通过小,膨胀阀排出量小于压缩机的流量,可以使压力。如果开孔太大,则会出现相反的情况,冷凝压力与热膨胀阀开孔有一定的正比关系。
  When the high-temperature and high-pressure refrigerant gas discharged from the compressor enters the condenser, due to the high temperature, it does not meet the condensing temperature conditions, so I can not well condense for liquefaction. The heat transfer of the condenser is in the gas-phase refrigerant, and the temperature of the refrigerant drops, so it will condense into liquid, reduce the volume of the capacitor, and reduce the space accordingly. The relative capacity reduction process of occupied condenser is also a process of relative pressure drop, and the process of heat dissipation and cooling determines the speed of this process. The amount of condensation is not enough. However, there is another factor that determines the condensation pressure (high pressure), and the expansion valve is opened (by volume). Because from the outlet of the refrigerant compressor, the discharge of the refrigerant liquid in the expansion valve is a dynamic balance. If the opening is small, the discharge amount of the expansion valve is less than the flow rate of the compressor, and the pressure can be made. If the opening is too large, the opposite situation will occur. The condensation pressure is proportional to the opening of the thermal expansion valve.
  总之,汽车空调是由高压1)压缩比2)气体的绝热指数3)吸气温度4)压缩机温度5)冷凝器的冷却性能6)膨胀阀和其他因素的匹配性能,如果以后再遇到高压高时,你可以找到一个解决方案从上面的因素。
  In a word, automobile air conditioning is composed of high pressure 1) compression ratio 2) adiabatic index of gas 3) suction temperature 4) compressor temperature 5) cooling performance of condenser 6) matching performance of expansion valve and other factors. If you encounter high pressure in the future, you can find a solution from the above factors.
  以上是济南沃尔沃汽车专修公司小编为大家介绍的相关内容,想要了解更多内容,欢迎访问网站:http://www.sdjnltqf.comThe above is the relevant content introduced by the small edition of Jinan Volvo car repair company. If you want to know more, please visit the website: http://www.sdjnltqf.com

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