B4-DH-17-D cle No LP Z Sealing low speed shaft LSS Bevel-helical gear reducer B4

Flender/Flender Gear Units/Bevel-helical gear reducer B4

ty in the refrig- erator oils used so far, such as alk lbenzenes and mineral oiK. Polyglycols and diesteroils were foundto besolubleoilsfortherekgerantsR1aand R1a,aswellasfortherefrigerantmix- tures R2/R1a and R1a/R1a. Of the three refrigerants, R1,5a has the best solubility properties with these oils. Although the solubility obtained in studies with mixture of R1a 2 and polyol ester was incomplete in the entire concentration and temperature range,it was sufficient for practical purposes. The solubility of diester oils in R1a decreases as their visco- sity increases. The solubility of these oils in R2 is ap roximatelyas low as that of commercial1 available oils. In the case of oiVR2 mixtures with Iigh refrigerant content, segregation of ai the oils occurred below the critical temperature of R2, this being 2.9 ". Addition of R1a to refrigerants R2 and R1a greatly improved their oil solubility in compa- rison with the monorefrigerants. For example, the refrigerant mixture R1a/R1a, contain- ing 1 7% R1a by mass, displayed segregation temperature with the polyol ester which was some 1 5 to 2 Kelvin lowerthan thatwith pure R1a. mixturecomprising equal proportions of R1aand R1a wascompletelysolublein thetemperaturerangeexamined,regardlessof the composition. In addition to the solubility investi ations, the liquid densities and viscosities of the pure refrig- erants R1a and R1a, and of # mixtures R2/R1a and R1a/R1a, were measured in mixture with polyol ester. The results can be used for basiccalculation and designing of refrigerating systems to be operated using these substances. This research project has shown that, in addition to the pure refrigerant R1a, the refrigerant mixture R1a/R1a constitutes possible alternative to R1, refrigerantwhich contributes greatly towards ozone de letion.This refrigerant mixture is almost azeotro ic, has far better oil solubility than R1a ancfis non-flammable in mixtures containing less tlan 1% R1a by volume