The reason why the impeller of the Wujin hot oil pump seal ring wears too fast and is too heavy and the cause of the repair failure 1 The oil quality of the oil pump is poor. The faucet filter or oil horn is too close to the sand or placed in the sand. 3 The poor quality of the oil pump assembly does not meet the requirements. Wujin hot oil pump seal ring impeller wear too fast too heavy cause and maintenance [cause]
1 The oil quality of the oil pump is poor.
2 Oil faucet filter or oil horn is too close to the sand or placed in the sand.
3 The poor quality of the oil pump assembly does not meet the requirements.
4 The oil pump impeller nut is loosened often or for a long time, causing the impeller to loosen and eccentric.
5 The oil pump often works under cavitation conditions, increasing the degree of cavitation damage of the oil pump.
[Maintenance method]
1 Check the oil quality of the oil pump. For the inspection, use the well washing (recommended with air compressor or other tools), set the fence and other measures to improve the oil quality. Ensure that the oil content of the oil can be effectively reduced (generally, the volume ratio of sand in the well oil should be no more than 0.02%) and the content of impurities.
2 Raise or lift the oil faucet of the oil pump and the oil horn to leave the sediment. Under normal circumstances, Bo Taibang is better than 1 meter away from the bottom of the well, not less than 0.5 meters.
3 Open the pump body of the oil pump, check the clearance of the seal ring, the installation position of the impeller and the installation quality (whether the positioning key of the impeller is tilted, the lock nut is loose or loose, and the clearance between the impeller and the pump casing meets the requirements, etc.) Repair, adjust or replace as appropriate. Finally, reassemble the oil pump as required. When assembling the oil pump, it is necessary to ensure the installation accuracy of the oil pump. When assembling the mechanical seal, the moving and static rings should be cleaned and a small amount of clean lubricating oil should be applied on the friction auxiliary surface. The high pressure end and the low pressure end should be taken into consideration. When installing the static ring gland, the force should be even to prevent the pressure deviation. After installation, the feeler should be inspected with a feeler gauge. The deviation between the upper and lower positions is not more than 0.05 mm. Check the clearance between the gland and the outer diameter of the shaft. The circumference should be even. The deviation is not more than 0.1 mm, and the radial runout of the pump shaft where the mechanical seal is installed shall not exceed 0.05 mm; before the assembly of the pump cover and the sealed end cover, the installation and positioning dimensions of the mechanical seal shall be carefully reviewed. If the positioning size does not meet the requirements, The steel pad is used to adjust between the bushings, but the steel pad has high precision and the thickness difference does not exceed 0.01 mm.
The seal ring is a metal ring (also called a ring ring) mounted on the pump casing at the inlet of the impeller. Its function is to prevent abrasion between the impeller and the pump casing. The form is flat and end face sealed. The advantage of the end face seal type is that the oil that leaks back flows out in the radial direction, and the straight flow out in the axial direction improves the oil flow state at the inlet of the oil pump and improves the efficiency of the oil pump. The gap size of the seal ring is related to the inner diameter of the ring. The general gap value is only 1~4 mm and the maximum is not more than 0.8 mm. Botou Taibang Pump & Valve Manufacturing Co., Ltd. 4 Open the pump body of the oil pump and check the wear and fixing of the impeller. If the impeller is partially worn, the impeller should be removed for repair or replacement.
5 Eliminate cavitation factors, improve cavitation resistance, and reduce the installation accuracy of the pump as appropriate (to correctly calculate the installation height of the pump).
Wujin hot oil pump cavitation prevention and control methods:
One: Correctly determine the oil absorption height of the oil pump to ensure that the pressure at the impeller inlet is not lower than the vaporization pressure.
Second: Minimize the loss of oil head in the suction line. Because the greater the loss, the more pressure is reduced at the inlet of the pump, and the oil is easily vaporized. Therefore, it is necessary to shorten the length of the suction pipe, reduce the accessories on the pipe, smooth the inner wall of the pipe and appropriately increase the diameter of the suction pipe.
Three: The oil pump is installed in the well. If cavitation is caused by excessive oil absorption, the pump can be installed downhole or below the surface, near the oil suction surface.
Fourth: use jets to increase the pressure on imports.
Five: Try to operate the oil pump under rated conditions. If the oil pump is running below the rated lift or greater than the rated speed, the flow rate of the oil pump must be greater than the rated flow rate. The oil flow speed at the impeller inlet must be increased, and the pressure at this point will be further reduced. Therefore, the oil pump lift and the speed of the oil pump cannot be reduced at will. .
Six: Set the induction wheel at the inlet of the oil pump, or use the anti-cavitation oil pump parts.
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Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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