Five troubleshooting of high temperature heat transfer oil pump

Inhalation of air is a common failure of high-temperature heat transfer oil pump, the following describes the method to exclude this problem of inhalation of air:
First, the high-temperature heat pump oil pump shaft shaft seal generally used. 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.
Second, CB-B-type high-temperature heat-conducting oil pump 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 at work; Similarly, the 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 shape of the glyph, or grinded on the 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.
Third, the fuel tank is not enough oil, or the 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 oil 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.
Fourth, the 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 oil port 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 heat transfer oil pump can not only prevent the inhalation of air, but also prevent noise.
Fifth, the installation location of the heat transfer oil pump 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 caused by insufficient air intake. At this point should be adjusted to the relative height of the pump and oil surface to meet the requirements.

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