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Advantages of vertical self-priming pump in low-level transportation of corrosive liquids
Source: China Bearing Network Time: 2018-01-14
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The advantage of the vertical self-priming pump in the low-level transport of corrosive liquids is usually when the centrifugal pump is transporting liquid; when the liquid level is lower; the pump is required to dry the water. To do this, the bottom valve should be installed at the pump inlet. The bottom valve is corroded or stuck; it is exchanged or repaired as needed; therefore, it is very inconvenient to use. The submersible pump is usually used to transport clean water and river water; and it is easy to attack the motor when used for corrosive liquid transportation such as acid and alkali. Leakage appearance; very unsafe. When the pump is blocked by waste, it is necessary to pull the pump up and finish it; it is very inconvenient; so it is rarely used in practice. So everyone created a submerged pump for low-level transportation; The lower pump handles the problem of low-level transport. However, because the long axis is selected, the impeller has an unbalanced radial force; the entire shaft is also in a cantilever layout; thus, a large deflection is formed at the impeller end during the transition. The longer the shaft is; The greater the deflection. In order to deal with this problem; there are bearings on the shaft. But because the whole shaft is a flexible shaft; the bearing is continuously unilaterally worn; the wear is large; the bearing is shaken sharply; the wear speed is accelerated; Lower pump The bad frequency is high. And the shaft should not be made too long; usually within 2 meters. The bearings of the submerged pump are cooled and smoothed according to the medium transported by the pump. If the pumped medium does not refrigerate the bearing And smooth (this condition will occur when the pump is empty and the inlet is blocked by debris); it will burn out the tile; even burn the motor. The repair device of the submerged pump is very troublesome. Especially in the transport is corroded. When it is a medium, it is difficult to finish without lifting things.
The submerged pump handles the problem of low-level transportation; however, it also brings a lot of troublesome applications. Shanghai Ligong Pump Co., Ltd. introduces a patented vertical self-priming pump produced by foreign advanced technology; it is an aligning submerged pump. The above defects are specially designed for the transportation of low liquids. It can replace the long axis submerged pump on the ground; the self-priming height can reach 8 meters; it can be used as a bottom pump and a sweeping pump on the ship. The advantages of the submerged pump:
1. The whole pump is vertical layout; compared with the submerged pump with the same parameters; the component is greatly reduced; the land occupation is also less. Because the shaft is straight to the device; the shaft seal is not easy to leak.
2, the self-priming pump canceled the long axis; together also canceled the bearing problem, so that the repair is greatly extended; together also cut the oscillations.
3, there are some that can be damaged and need to be repaired on the ground; giving repairs a lot of convenience. The pump inlet is only a hollow tube; no bottom valve is required. If the inlet is blocked by waste; Pull out to finish; and the submerged pump requires the entire pump to be lifted out.
4. The submerged pump needs to determine the pumping depth when purchasing; if the liquid depth does not match the pump shaft length; then the pump needs to be replaced; and the vertical self-priming pump only needs to be equipped with hollow tubes of different lengths; The same depth without swapping itself.
5, the air pump work can still be maintained for a long time; in order to facilitate the detection and adoption of methods to avoid damage to the motor; reduce the loss caused by misuse; good security.
6. The submerged pump is necessary to be placed directly above the liquid. The self-priming pump can be installed at the top; it can also be placed next to it; even a vacuum hose can be used to suck the liquid that cannot be reached by the straight pipe; the maneuverability is very strong.
Second: saving capital: because the submerged pump repairs frequently; usually one tank (tank) needs two pumps; one pump for repair and standby; the investment is huge; the repair amount is large. The self-priming pump can complete the multi-cell (slot) string, A pump is shared in parallel; the investment is saved. The self-priming pump can be used for intermittent operation of gas and liquid; it is not afraid of convulsions; some intermediate equipment in the process flow can be omitted; such as high-level tank or low-position tank; greatly simplifying the process flow; Saving money.
Three: Principle and application of Ligong vertical self-priming centrifugal pump: The principle of self-priming pump selects the common patented impeller and separate disc to force the gas and liquid to separate and complete the inhalation process. Its shape, volume, component and power are similar to those of the pipeline pump. Self-priming pump does not require auxiliary equipment such as bottom valve, vacuum valve, gas separator, etc. It does not need to be filled when starting normal production; it has strong self-priming ability; it can replace the currently widely used submerged pump (low liquid delivery pump) It can be used as auxiliary equipment such as separate parts. It does not need to be filled when starting normal production; it has strong self-priming ability; it can replace the currently widely used submerged pump (low liquid delivery pump); it can be used as circulating pump, tank truck Self-priming pipeline pump, motorized pump, etc.
Four: raw materials: reinforced polypropylene, steel lining, F46, PVDF, cast steel, stainless steel, 304, 316, 316L, 904L (UB6); and duplex stainless steel.
V: The vertical self-priming centrifugal pump has been used in many occasions; the units that have been connected for three years without faults and without repair records (including mechanical seals) are: Sichuan Yinshan Chemical Group (ammonium phosphate), Sichuan Neijiang Power Generation Near 100 companies including the plant, Yunnan Huize Lead-Zinc Mine, Qingdao Luda Company, Qilu Petrochemical, Gusu Resin Factory, Shanghai Chlor-Alkali Chemical Plant, Shanghai Fuhai Wood Industry.
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