The installation position of the heat transfer oil pump is too high from the oil level, especially when the pump rotation speed is reduced, because the vacuum necessary for the pump suction chamber cannot ensure that the suction oil is insufficient and the air is sucked. At this point, the relative height between the pump and the oil surface should be adjusted so that it meets the defined requirements.

If there is not enough oil in the fuel tank, or if the suction nozzle is not inserted below the oil level, the pump will draw in air. At this time, the oil tank should be filled with oil to the oil marking line; if the oil return nozzle surface is exposed, sometimes the oil level will be affected by the system. Instantaneous negative pressure allows the air to backflow into the system, so the return pipe should generally be inserted below the oil level.

Heat pump oil pump and the both sides of the end cover for direct contact with the hard seal, if the contact surface of the flatness can not meet the requirements, the pump can easily inhale air at work; Changzhou Wujin first heat pump, the same pump The end cap and the gland are also in direct contact with each other, and air is also easily intruded. If the gland is a plastic product, the seal may be airtight because it is damaged or deformed due to temperature changes. The method to eliminate this kind of failure is: When the flatness of the pump body or the pump cover does not reach the demarcated requirements, it can be grinded on the flat plate with gold grit, or it can be ground on the surface grinding machine. The flatness does not exceed 5 μm, and the perpendicularity of the plane and the hole needs to be ensured; for the leakage of the pump cover and the gland, an adhesive such as epoxy resin can be used for sealing.

The heat transfer oil pump is generally sealed with a skeleton oil seal on the pump shaft. If the spring of the clamping lip falls off, or the oil is reversed, or the lip thereof is strained or deteriorated, the back end of the oil seal will often be in negative pressure and air will be sucked in. Generally, the new oil seal can be replaced to solve the problem.