Abstract
Air conditioning systems in vehicles require long-term reliability during their entire service life. Especially, a good sealing function is needed for the prevention of coolant leaking. Unfortunately, in specific cases, after a particular time, screw connections of the air conditioning circuit lose their tightness, and the coolant starts to leak. Therefore, this paper focuses on the analysis and design optimisation of screw connections. We used the finite element method for describing the sealing, screw and disc spring behaviour. Then, we proposed a new design of the disc spring to obtain the proper force-deformation characteristics of the connection and ensure the tightness of the screw connection.
Highlights
Air conditioning systems in cars are realised as aluminium alloy high-pressure circuits conjunct through screw connections
This paper focused on proper sealing function analysis of the screw connection used in the air conditioning system
We proposed the optimised design of this connection mainly based on decreasing the stiffness of clamping parts through the disc spring
Summary
Air conditioning systems in cars are realised as aluminium alloy high-pressure circuits conjunct through screw connections. Screw connections are based on fitting with eccentric screw against sealing from copper alloy. The pressure sealing of the circuit is unreliable after screw connection assembling under a standardised process, especially after. Pešík a certain time or reassembling process. Performed checkups of connection have not detected possible failure during the assembling process. It should be noted that the literature indicates various diagnostic methods used in the technique [1, 2]. This paper aims to analyse the screw connection to define its basic characteristics respecting its tightness and solution proposition
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