Internal Gear Pumps Pressure Failure: What Are The Causes?
Large pressure fluctuations
① The pump body and the front and rear covers are not processed well, the eccentricity error is large, or the clearance between the outer rotor and the pump body is too large. At this time, the eccentricity should be checked, and the error of the eccentricity should be within the range of ± 0.02mm. The clearance between the outer rotor and the pump body should be in the range of 0.04 to 0.06 mm.
② The tooth profile accuracy of the inner and outer rotor (cycloid gear) is poor. The inner and outer cycloid gears are mostly pressed by powder metallurgy molds. The mold and other reasons will affect the tooth profile accuracy of the cycloid gear wheels. Users can correct it. Serious damage must be replaced.
③ The radial and end face runout of the inner and outer rotors is large. Correct the inner and outer rotors so that the accuracy meets the technical requirements.
④ The backlash of the inner and outer rotors is too large. Replace the inner and outer rotors, and ensure that the backlash is within 0.07mm.
⑤ Air is mixed in the pump. Remove air from the system and take measures to prevent air from entering the pump from the suction line of the pump.
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