Gear pump design steps are as follows: 1. According to the flow to determine the gear modulus, number of teeth, helix angle, coefficient of variation and the center distance 2. Estimate the maximum gear pump size, order with the outline dimensions to determine the first step Of the design meets the requirements, does not meet the first step is to amend the gear parameters and center distance 3. The final determination of gear modulus, number of teeth, helix angle, coefficient of variation and center distance 4. Design of the internal structure of the gear pump 5. Complete The fourth step, the basic structure of the main parts have been identified, the following is to improve the design of small parts If the mapping of others gear pump, mapping center distance and the number of teeth, gear diameter or root diameter, helix angle to calculate Geometry and modulus of gear change coefficient. Whether the new design or mapping, the parameters of the gear should be repeated several times the calculation, very troublesome. Some experience: Variable gear gear pump structure can become more compact, if the design of gear pump, the general does not recommend the use of standard gear, so waste materials, pump volume efficiency is relatively low, the general use of variable gear (straight or inclined ), And then tooth top high, so that gear pump efficiency is much higher, if the design is reasonable, within 0.6MPa pump volume efficiency can reach 90-95%. The theoretical flow of the gear pump can be calculated using the formula: n * B * (Da ^ 2-Df ^ 2) * pi * 60 * 10 ^ (-9) / (4 * cosβ) m ^ 3 / h, / min, B: gear width mm, Da: tip circle diameter mm, Df: root circle diameter mm, β: helix angle (degrees).
