Because car air conditioning makes cold system,each component and conduit all can use detachable type to bind, compressor also is structure opening type, and of refrigeration agent permeate ability very strong, because of this refrigeration system divulging is inevitable. Occupying breakdown of air conditioning of statistical 70%~80% car is to have divulge cause, because this leak hunting works,a very important segment is in exercise of car air conditioning. At present commonly used leak hunting method basically has the following kinds.
1) leak hunting of leak hunting instrument
Leak hunting of leak hunting instrument is the the most commonly used, mainest leak hunting measure in exercise of leak hunting of car air conditioning, use light of haloid leak hunting namely or haloid leak detector is opposite the electron each component or join pipeline have refrigeration system leak hunting. The premise that uses leak detector leak hunting is the pressure with must have constant inside refrigeration system pipeline (98~294kpa) refrigeration agent, before undertaking leak hunting works accordingly, should right amount the refrigeration agent that adds certain amount (to car air conditioning, after vacuumize exercise undertakes finishing, the agent of liquid state refrigeration that controls from 200g of high-pressured side infuse can) , or do not give off the original refrigeration agent inside the system with equipment leak hunting with.
Car air conditioning maintains the place that needs key leak hunting to basically have:
A. Tear open has built refrigeration system part and each coupling place.
B. Compressor axis is sealed, a powerful person of gaskets of around end lid, overhaul and overheat protector.
C. Condenser carbon fin reachs nozzle of coupling of refrigeration agent pass in and out.
D. Refrigeration system each pipeline and coupling place.
2) leak hunting of lathery foam law
When doing not have leak hunting equipment, the position that can use suds to arise to the likelihood has direct examination, the method is to pass manifold manometric give the dry nitrogen that 784~1172kpa fills inside the system, besmear suds or other blowing agent in the place that needs an examination next, wait like welding line of each coupling head, if send,blow now lathery, explain the place has divulge. If do not have azotic gas cylinder, also can fill agent of constant pressure refrigeration to undertake leak hunting, but the waste that this creates refrigeration agent. This kind of method is simple, practical, safe, especially the place with unfavorable and adjacent lamp of applicable leak hunting, dan Lingmin spends difference, after the operation completes, should keep clear of clean.
3) oil stains law
Refrigeration agent and refrigerant oil can each other dissolve, because of,be like sealed and undesirable and when making refrigeration agent is divulged, can take a few refrigerant oil, make divulge place form oil mark, stick on dust forms greasy filth. Can find according to this kind of phenomenon divulge place, be in only nevertheless divulge when the amount is larger, this kind of phenomenon ability is apparent.
4) chromatic law
In adding the dye of some kind of color refrigeration agent, be together as refrigeration agent in pipeline flow circularly, happen when systematic pipeline or component when divulging, affiliation dye leakage comes out and also stick in what divulge place to make to become angry subsequently, through observing the color of refrigeration system pipeline and component, divulge place with respect to easily discovery. Fluorescent agent also is belonged to chromatic
5) vacuum is protected control a standard
After vacuumize exercise is finished, do not be eager to adding note refrigeration agent, the time with hold systematic vacuum position proper however (general tens of cent come several hours) hind, manometric low-pressure watch vacuum spends observation manifold to whether produce change. If vacuum directive did not produce change, explain the system is not had divulge; Like vacuum the directive picks up, explain the system has divulge. This kind of method can judge a system to have only without divulge, and cannot specific directive divulges place, because this is used at adding only,note the preliminary check-out before refrigeration agent.
