This paper detail the design and fabrication of a portable car tyre inflator to deliver compressed air at high pressure (200kpa). The aim is to build a working proto-type of a portable car tyre inflator and test it for efficiency and effectiveness. The device has a mass flow rate of ṁ=7.09x 10-6 kg/s and a volumetric flow rate of VD =3.55x10-2 m3/s. it was designed to pump a deflected non punctured car tyre in the shortest possible time of about 3-5minutes. The tyre inflator device comprises a single cylinder reciprocating compressor, gear drive, a dc electric motor, a dc battery of 12V 75A, transformer, etc. The device is to be connected to the car battery via the cigarette lighter socket provided in the car. The design consideration, analysis and calculation are based on thermodynamic principles of positive displacement reciprocity machine, strength and rigidity of the mechanical element. The materials selected for the design are so chosen in view of economy, light weight and compatibility for easy handling. The device was tested after fabrication and it was found to be very efficient in its performance. 10 car tyres were inflated with the device and it was found that the time it took to inflate the tyres was with the time range of 3-5 minutes, showing that it objective was achieved. The functioning of the compressor was appreciable in all the tests conducted delivering a volumetric efficiency of 0.85 about 85% which shows more air is been used in the piston compression stroke.

Full text: IJEIR_2454_FINAL.pdf