Gear pump vibration and noise causes and exclusions

2CY-7.5 / 2.5 gear pump vibration and noise causes and exclusions 1. Mechanical reasons Ⅰ. Because of the dirt in the oil into the pump gear and other components resulting from wear and tear and noise. Should replace the oil, strengthen the filter, open the pump cleaning; serious wear and tear of the gear, to be repaired or replaced. Ⅱ. Pump and coupling due to irregularities in the requirements of vibration and noise. Should be required to adjust the coupling Ⅲ. Gear assembly gap is too small axial; gear and the front and rear end cover of the sliding surface between the gear assembly before the burr failed to carefully remove, so that when running the joint surface strain Resulting in a decrease of the output flow rate. The dirt enters the pump and is wedged into the gap between the end face of the gear and the front and back end covers to cause the high and low pressure chambers to communicate with each other due to radial grooves Output flow decreases. The above measures should be used to repair the following measures. Disassemble 2CY-7.5 / 2.5 gear pump, appropriately increase the axial gap that is grinding the end face of the gear; with a flat grinder polished front and rear cover end face and gear end, and remove the gear teeth on the burr (can not be chamfered); through the plane Before and after grinding the end cover on the end of the unloading trough depth dimensions will change, should be appropriate to increase the width. Ⅳ. Pump parts damaged or severely worn will produce vibration and noise: such as the tooth or the pitch error of large errors, poor contact between the two gears, tooth surface roughness, overhang length of the common law, the tooth backlash is too small, the two meshing Gear contact area is not in the sub-round position. At this point, you can change the gear or the gear on the ground. At the same time, the needle roller cage bearing damage, the length of the shaft journal and needle wear, etc., can lead to poor bearing rotation and mechanical noise, this time need to dismantle the 2CY-7.5 / 2.5 gear pump, needle roller bearings. Air Inhalation Ⅰ. The shaft of the pump is generally sealed with a skeleton 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 inhalation of air, the general can replace the new seal to be resolved. CB-B 2CY-7.5 / 2.5 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; Similarly, the pump Between the end cap and the gland is also in direct contact with the air is also easy to invade; if the gland is a plastic product, due to its damage or deformation due to temperature changes, it will make the seal lax and into the air. 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 steel with the "8" shaped route with the gold sand, or on the surface grinder , So that its flatness does not exceed 5μm, and the need to ensure that the plane and the hole perpendicularity requirements; For the pump cover and gland at the leak, can be coated with epoxy adhesive sealing. Ⅲ. Suction filter is clogged with dirt or its capacity is too small, resulting in increased suction resistance and sucked into the air; In addition, the larger diameter of the inlet and outlet may also bring 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, not only can prevent the inhalation of air, but also to prevent noise. Ⅳ. When there is not enough oil in the fuel tank, or if the oil suction nozzle is not inserted below the oil surface, the air will be sucked in by the pump. At this time, the oil tank should be filled with oil to the oil standard line; 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. Ⅴ. Pump installation location is too high from the oil surface, especially when the pump speed is reduced, because the pump can not guarantee the necessary degree of vacuum caused by insufficient suction oil sucked into the air. At this point should be adjusted to the relative height of the pump and oil surface to meet the requirements.

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