附件24.4 (1)What is the relationship between the rotation direction of gear pump with it's location of suction and displacement port? (2)State points that how the gear pumps solve the problem of unbalanced hydraulic radial force and Phenomenon of surrounded oil by observing the structure of it (3)What are the main factors which impact the gear pump to raise the working pressure? What Corresponding measures should be taken for High-pressure gear pump structure in generally Experiment 2 Experiment of assembling vane pumps of YB type 1.General deseription The greatest advantages of gear pumps are:smooth movement,low noise,large flow pulsation and high volumetric efficiency.But it also has some shortages,such as Poor performance of self-priming suction,Speed should not be too high,Sensitive to the pollution hydraulic oil,Complex structure and soon Vane pumps may be either of the single-acting or double-acting type.The former could be used for variable displacement pumps with lower pressure While the latter for fixed displacement pumps with the working pressure reaching to 65~140 kg/cm2 YB-type Vane pump is a double-acting pumps with good performance,which is designed and manufactured by own designers and manufacturing engineers in our country.It's greatest advantages are that YB-type Vane pump has symmetrical structure to bear counterbalance so that rotor bears litter radial force.The pressure of YB-type Vane pump can reach to 63 kg/cm2and the volumetric efficiency can reach to9% 2.The purpose of the experiment X 附件 24.4 4 (1) What is the relationship between the rotation direction of gear pump with it’s location of suction and displacement port? (2) State points that how the gear pumps solve the problem of unbalanced hydraulic radial force and Phenomenon of surrounded oil by observing the structure of it (3) What are the main factors which impact the gear pump to raise the working pressure? What Corresponding measures should be taken for High-pressure gear pump structure in generally. Experiment 2 Experiment of assembling vane pumps of YB type 1. General description The greatest advantages of gear pumps are: smooth movement, low noise, large flow pulsation and high volumetric efficiency. But it also has some shortages, such as Poor performance of self-priming suction, Speed should not be too high, Sensitive to the pollution hydraulic oil, Complex structure and so on . Vane pumps may be either of the single-acting or double-acting type. The former could be used for variable displacement pumps with lower pressure While the latter for fixed displacement pumps with the working pressure reaching to 65～140 kg / cm 2 . YB-type Vane pump is a double-acting pumps with good performance, which is designed and manufactured by own designers and manufacturing engineers in our country. It’s greatest advantages are that YB-type Vane pump has symmetrical structure to bear counterbalance so that rotor bears litter radial force. The pressure of YB-type Vane pump can reach to 63 kg / cm 2 and the volumetric efficiency can reach to 90% 2. The purpose of the experiment