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首页> 外文期刊>Science and Technology for the Built Environment >Servicing and installing equipment using flammable refrigerants: Assessment of field-made mechanical joints (ASHRAE RP-1808)
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Servicing and installing equipment using flammable refrigerants: Assessment of field-made mechanical joints (ASHRAE RP-1808)

机译：使用易燃制冷剂维修和安装设备：对现场机械接头进行评估（Ashrae RP-1808）

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摘要

This paper presents the results of a study investigating the assembly, durability, and leak rate of mechanical joints used in refrigerant and air-conditioning systems. A significant motivating factor of the study is identifying joint types that are suitable for use in systems that employ flammable refrigerants. In the study, three different fitting types were evaluated (press or crimp fittings, compression fittings, and flare fittings) as well as a set of brazed joints to act as a leak-free baseline. The fittings were asssembled by a combination of experienced and inexperienced technicians, and the assembly times and number of leaks observed after assembly were recorded and compared for different fittings and technician experience levels. All fittings then underwent one type of durability test: Pressure-temperature cycling, freeze-thaw cycling, or vibration testing. The fittings were then leak checked under positive pressure with R32. The results showed the press fittings resulted in the shortest assembly time, fewest assembly errors, fewest failures from harshness testing, and an acceptable leak rate. However, while more prone to failures during assembly and harshness testing, compression and flare fittings, when properly assembled and tightened, resulted in noticeably lower positive-pressure leak rate compared to press fittings.
机译：本文介绍了研究制冷剂和空调系统中使用的机械接头的组装，耐久性和泄漏率的研究结果。该研究的显着激励因子是识别适用于使用易燃制冷剂的系统的关节类型。在该研究中，评估了三种不同的配件类型（压接或压接配件，压缩配件和喇叭形配件）以及一组钎焊接接头以充当无泄漏的基线。通过经验丰富的技术人员的组合进行了混合，并记录了组装后观察到的装配时间和泄漏数量，并比较不同的配件和技术人员体验水平。然后，所有配件都接受了一种耐久性测试：压力温度循环，冻融循环或振动测试。然后将配件泄漏在用R32的正压下检查。结果显示，压力机导致最短的装配时间，最少的装配误差，来自严苛测试的最少的故障以及可接受的泄漏率。然而，虽然在装配和严苛测试期间更容易出现故障，但在适当组装和拧紧时，压缩和闪光配件，导致与压配件相比明显较低的正压力泄漏速率。

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