| Along with more and mor automobile are equipped with heater,the new type of fuel pump should be designed in order to increase the combustion efficiency and expedite sweeping production of automobile heater. The main contents include as follow:1. Refering to the domestic and overseas data of fuel pump.Because the cycloidal internal gear pumphas small bulk,but its cubage efficiency is high and its pressure wave of fuel is not distinctness .The cycloidal internal gear pump is selected to design for supplying fuel after analsying and comparing some type of pump which are usually used.2. The principle of cycloid is introduced and based on it the externality of rotor is analyse. The equation of rotor externality curve of internal gear pump is established. At last the conclusion is acquired that the shap of rotor externality is decided by four parameters:Z1,R,e,a.3. Based on the heater fuel pressure and flux,the flux of pump is counted. Refering to experience data,select the pump's parameters and finish the design of the whole pump.4. The internal gear pump is tested by a series of examination.The pump is validated that it can appease the automobile heater. The pump's cubage effency is proved to be lower than experience value under the high exit fuel pressure.The rule that the three types of assort gap infect on actual flux and cubage efficiency.It is found that the pump's actual flux and cubage efficiency decrease more quickly under the influence of flank assort gap. |
