(A) gear pump flow
　　
1. Theoretically, the volume of oil taken into the discharge chamber should be equal to the working volume between teeth. The following points need to be integrated.
　　
2. Qt per revolution should be the sum of the work volumes of all the two gears.
　　
3. It can be assumed that the working volume between teeth is equal to the effective volume of teeth.
　　
4 each turn Qt
　　
1) is the sum of the interdental working volume of a gear and the effective tooth volume
　　
2) an annular volume approximately equal to 2 m in radial width (m is modulo) swept by the effective part of the tooth
　　
(B) gear pump flow formula
　　
When using the pump Qt calculated above, the value is small
　　
Should be multiplied by the correction factor K. The average Qt is:
　　
Qt = K · D · 2m · B · n × 10-6L / min
　　
Where: D - dividing circle diameter, mm;
　　
m - modulus, mm;
　　
B - tooth width, mm;
　　
n - speed, r / min;
　　
K - correction factor, usually 1.05 ~ 1.15.
　　
Medium and low pressure gear pump to make flow formula
　　
Qt = 6.66zm2Bn • 10-6nL / min (2-4)
　　
High-pressure gear pump flow formula:
　　
Qt = 7zm2Bn • 10-6L / min (2-5)
　　
(C) ways to improve the theoretical flow of gear pump
　　
Increase the gear diameter, tooth width, speed n and reduce the number of teeth.
　　
Too high n will cause the teeth to pass through the suction chamber too short
　　
Increasing the diameter of n increases the circumferential speed of the gear and increases the centrifugal force
　　
1. Increased difficulty in aspiration, lower oil pressure p at the root, gas evolution may occur resulting in a decrease in Q, vibration and noise, or even inability of the pump to work.
　　
2. Therefore, the maximum circumferential speed should be based on the viscosity of the oil to be limited,
　　
1) the maximum circumferential speed does not exceed 5 ~ 6m / s,
　　
2) The maximum speed is generally about 3000r / min.
　　
Larger tooth width will increase the radial force, tooth surface contact line longer, not easy to maintain a good seal.
　　
Although reducing the number of teeth can make the interdental volume V increased and Q increases, but will make Q of non-uniformity increased.
　　
1. Theoretically, the volume of oil taken into the discharge chamber should be equal to the working volume between teeth. The following points need to be integrated.
　　
2. Qt per revolution should be the sum of the work volumes of all the two gears.
　　
3. It can be assumed that the working volume between teeth is equal to the effective volume of teeth.
　　
4 each turn Qt
　　
1) is the sum of the interdental working volume of a gear and the effective tooth volume
　　
2) an annular volume approximately equal to 2 m in radial width (m is modulo) swept by the effective part of the tooth
　　
(B) gear pump flow formula
　　
When using the pump Qt calculated above, the value is small
　　
Should be multiplied by the correction factor K. The average Qt is:
　　
Qt = K · D · 2m · B · n × 10-6L / min
　　
Where: D - dividing circle diameter, mm;
　　
m - modulus, mm;
　　
B - tooth width, mm;
　　
n - speed, r / min;
　　
K - correction factor, usually 1.05 ~ 1.15.
　　
Medium and low pressure gear pump to make flow formula
　　
Qt = 6.66zm2Bn • 10-6nL / min (2-4)
　　
High-pressure gear pump flow formula:
　　
Qt = 7zm2Bn • 10-6L / min (2-5)
　　
(C) ways to improve the theoretical flow of gear pump
　　
Increase the gear diameter, tooth width, speed n and reduce the number of teeth.
　　
Too high n will cause the teeth to pass through the suction chamber too short
　　
Increasing the diameter of n increases the circumferential speed of the gear and increases the centrifugal force
　　
1. Increased difficulty in aspiration, lower oil pressure p at the root, gas evolution may occur resulting in a decrease in Q, vibration and noise, or even inability of the pump to work.
　　
2. Therefore, the maximum circumferential speed should be based on the viscosity of the oil to be limited,
　　
1) the maximum circumferential speed does not exceed 5 ~ 6m / s,
　　
2) The maximum speed is generally about 3000r / min.
　　
Larger tooth width will increase the radial force, tooth surface contact line longer, not easy to maintain a good seal.
　　
Although reducing the number of teeth can make the interdental volume V increased and Q increases, but will make Q of non-uniformity increased.
Fluid Ends,Fluid End Assembly,Fluid End Spare Parts,Fluid End Of Mud Pump
Jiangyin Yida Machinery Manufacturing Co.,Ltd. , https://www.yidamachineries.com