1、CENTRIFUGAL PUMP IN CHEMICALPRODUCTIONAPPLICATION Centrifugal pump in chemical production, this is most widely used because of its performance wide range (including flow, pressure head of media properties and ShiYing sexual), small volume, simple structure, easy operation, flow uniformity, low malfu
2、nction, long service life, CaoZuoFei are lower cost and prominent advantages. (1)centrifugal pump principle of work Centrifugal pump working principle is: centrifugal pump so can turn the water away is because only centrificating. Water pump before work, pump body and feed water full line must be ca
3、ns in vacuum condition, when the impeller fast turns, leaf prompted water quickly spin, spin in the water under the action of the centrifugal force, pump impeller flew in from the water was thrown in the central part of the impeller, after forming vacuum area. Water in the water atmospheric pressure
4、 (or water pressure) under the action of water pipe pressure came through a tube. This cycle unceasingly, can achieve continuous pumped. In the centrifugal pump is worth mentioning: before initiating must to the pump housing filled with water, can start after, otherwise will cause, the vibration of
5、the pump body, thus reduce heat pump, damage to (hereinafter referred to as cavitation erosion) cause equipment accident! Centrifugal pump is a lot of more phyletic, classification methods common has the following kinds of kind: 1, press the impeller inhaled way points: single suction style centrifu
6、gal pump double suction type centrifugal pump. 2, press the impeller number points: single grade centrifugal pump mulfistage centrifugal pump. 3, according to the structure of impeller points: open impeller centrifugal pump impeller half open centrifugal pump closed impeller centrifugal pump. 4, acc
7、ording to work pressure points: low voltage centrifugal pump medium centrifugal pump high-pressure centrifugal pump. 5, according to pump shaft position points: horizontal centrifugal pump edge vertical centrifugal pump. (2) basic structure, centrifugal pumps Centrifugal pump is the basic structure
8、by six parts, it is respectively, pump body, impeller pump shaft, bearing, sealing ring, the stuffing box. 1, centrifugal pump impeller is higher than the core part, its great strength, speed and a impeller blades of the main function, impeller before assembly through the static balance experiments.
9、 Internal and external surface requirements on the impeller of smooth, to reduce water friction losses. 2, the pump body also called pump shell, it is the pump body. Play support fixed effect, and is connected to install bearing bracket. 3 and the role of pump shaft couplings and motor was borrowed,
10、 will connect to the torque motor impeller, so it is the main component of mechanical transmission. 4, bearing is set in the pump shaft support of pump shaft components, a rolling bearing and sliding bearing two kinds. Rolling bearings use butter as lubricant refueling appropriate to general for 2/3
11、 3/4 volume too much, too little and can calorific a sound and fever! Sliding bearings use transparent oil for lubricant, refuels to oil level line. Too much oil to leak and drift along the pump shaft, too little bearing and melech overheating burnt out cause an accident! The water pump operation pr
12、ocess of the highest temperature bearing in general 85 degrees running in about 60 degrees, if gao will find the reasons (whether have impurities, whether black, oily water) and deal with whether! 5, sealing ring and say minus leak rings. The import and pump impeller shell of the gap between will ca
13、use the water pump high-pressure zone within the clearance flow by low pressure area, the influence of the pump, low efficiency, &safe-durable! Gap with the pump impeller had caused moment shell friction wear. In order to reduce leakage increased reflow resistance, delaying the impeller and pump she
14、ll used in the pump housing life, with inner and impeller sealing, department of foreign aid in the gaps remain sealed between 0.25 1.10 mm advisable. 6, stuffing box, mainly by packing rings, packing cone, water storage tube packing gland, composed. The role of the stuffing box is mainly to closed
15、pump shell with the space between the pump shaft, dont let pump of water inside dont flow to the outside to also dont let the outside air into the pump inside. Always keep the vacuum pump inside! When the pump shaft and packing friction heat water control water to be about to rely on water circle ma
16、ke packing cooling! Maintain normal operation of pump. So the water pump operation circuit checking process to the stuffing box examination is special attention should be paid to! About 600 hours in operation for packing replacement to. (3) centrifugal pump impeller and other components 1. Centrifug
17、al pump impeller Centrifugal pump impeller is the key components. according to the mechanical structure can be divided into closed, semi-enclosed and open 3 kinds. Closed impeller suitable for conveying clean liquid. Semi-enclosed and open impeller suitable for conveying containing solid particles o
18、f suspending liquid in the efficiency of, this kind of pump low. Closed and semi-enclosed impeller in operation, leave the impellers part of high pressure fluid can leak into the impeller and pump shell cavity, between the side because of impeller suction pressure low, liquid at the entrance is liqu
19、id in the role of the pressure before and behind impeller to differ, they generate pointing the suction side impeller axial thrust. This force to promote the suction side impeller pump impeller and mobile, cause the contact point of moab shell caused serious damage, the vibration of the pump unit, d
20、estroying the normal operation of pump. HouGaiBan in impeller drilled several holes, can reduce the pressure on both sides of the impeller is poor, and decrease the harmful effects of axial thrust, but also reduced the pump efficiency. These holes called balance holes. according to absorb fluid can
21、be divided into different ways of impeller with single suction style double suction type two kinds, single suction style simple structure, liquid only impeller from one side of the inhalation. Double suction style impeller can simultaneously from impeller symmetry to inhaled liquid, it not only has
22、a greater ability to absorb fluid, and basically eliminate the axial thrust. (3) on the impeller blade according to the geometrical shape, can be bent, radial after blade is divided into three, before and after bending due to bend the kinetic energy transfer liquid leaves, so for static pressure can be used extensively. 2. The centrifugal pump impeller
