High-temperature gear pump installation location is too high from the oil surface, especially in the pump speed is reduced, because the pump can not guarantee the necessary degree of vacuum caused by the vacuum suction enough to inhale the air. At this point should be adjusted to the relative height of the pump and oil surface to meet the requirements. Inhalation of air is a common high-temperature gear pump failure, the following is to exclude the inhalation of air failure method: A gear pump installation location from the oil is too high, especially when the pump speed is reduced, because the pump can not guarantee the necessary vacuum chamber Degree caused by insufficient suction and inhale the air. At this point should be adjusted to the relative height of the pump and oil surface to meet the requirements. Second, the tank of fuel is not enough, or suction nozzle is not inserted below the oil surface, the pump will inhale the air, this time should be added to the fuel tank to the fuel line; if the oil return pipe mouth exposed oil, and sometimes Due to the instantaneous negative pressure in the system and the air back into the system, so the return pipe nozzle should generally be inserted below the oil level. Three .CB-B high temperature gear pump body and both sides of the cover for direct contact with the hard seal, if the contact surface flatness does not meet the requirements, the pump easy to inhale the air in the work; the same pump end The cover and the gland are also in direct contact with each other, and the air is easily invaded. If the gland is made of plastic, the seal can not enter the air due to its damage or deformation due to temperature changes. The way to get rid of this kind of trouble is: when the flatness of the pump body or pump cover can not meet the stipulated requirements, it can be grinded back and forth on the flat plate with the gravure sand in the form of a glyph, or grinded on a surface grinding machine Flatness does not exceed 5μm, and the need to ensure the verticality of the plane and the hole requirements; for the pump cover and gland at the leak, can be coated with epoxy adhesive sealing. Four. High temperature gear pump on the shaft generally used to seal the oil seal. If the locking lip spring off, or the oil seal installed, or its lips were injured, aging, will make the back end of the seal often in negative pressure and inhale the air, the general can replace the new seal to be resolved. Five. Oil filter is clogged with dirt or its capacity is too small, resulting in increased suction resistance and inhalation of air; In addition, into the port of a larger caliber may also be brought into the air. At this point, you can clean the filter, or choose a larger capacity, and out of the appropriate diameter filter. In this way, the high-temperature gear pump not only prevents air intake, but also prevents noise.
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