Sealing ring sealing ring pump, centrifugal pump, self balancing multistage centrifugal pump inlet ring

Self balancing multistage pump inlet ring generally refers to the impeller mouth ring, is installed in the pump impeller and pump body between a metal ring ring, shape as shown in figure:

mouth ring, also known as the sealing ring, or wear ring. Its main role is to prevent the reverse outlet medium inlet side back medium sealing function is ( Therefore have a 'ring' this name) ; Also plays a role of wear-resisting, avoid direct contact with the impeller and pump casing damage has protective effect of the impeller So the name 'wear ring') 。

self balancing multistage centrifugal pump mouth ring, and the number of general pump series and mouth ring is the same, that is a level 5 pumps, mouth ring also has five, a mouth ring, four ring. Since the balance of the function of multistage pump inlet ring is formed between the impeller and the pump shell narrow, winding channels, to increase the flow resistance of medium to achieve the purpose of reducing medium leakage. Centrifugal pump mouth ring set also protect the main parts on the pump is not affected by the effect of wear and tear, in the mouth after the ring wear, can repair or replace the new ring, the normal assembly clearance, both economic and convenient for maintenance. General mouth ring gap will reduce the efficiency of water pump with pump pressurized flow experience with too much from the pump discharge area along the impeller mouth ring gap is returned to the entrance, which reduces the pump efficiency, at the same time due to the increasing traffic, can make the mouth ring was early wear and tear. Mouth ring gap is too big, also can reduce the flow of the pump, serious when not on the quantity. Self balancing multistage centrifugal water pump with the impeller mouth ring integrity and asked ham, radial clearance, when removing the pump should be checked first. Such as the centrifugal pump inlet ring has defects such as scab or broken or clearance Nai exceeds the value specified in, a new mouth rings should be replaced or repair welding to repair the original mouth ring. Self balancing multistage centrifugal pump in operation, the centrifugal pump with the impeller mouth ring corresponding circle is also wear gap caused by increases in excess of the prescribed value, because the new mouth ring inside diameter should be to make as the impeller inlet diameter, with a centrifugal pump impeller mouth ring radial clearance between both. In the repair process, the gap to a little bit small, can improve the work efficiency and prolong service life of pump. Self balancing the structure of multistage water pump inlet ring usually with radial clearance of labyrinth type ring, double ring ladder type, double loop and the axial clearance type, L type nozzle type sealing ring, double L type double sealing ring, internal meshing type single labyrinth seal ring and so on. Mouth ring material generally available grey cast iron HT200, cast steel and stainless steel materials, such as mouth ring material can be set according to the technical requirements. Material is SiN, four fluorine, etc. , mainly considering its wear resistance.

for the maintenance of the pump impeller mouth ring

water pump in operation, due to natural wear and tear, medium containing solid particles, impeller, shaking the centrifugal pump impeller mouth ring and seal ring radial clearance greatens or, the phenomenon of the ring is broken, not seal effect, cause a large number of reflux, reduce the actual flow of the pump. The impeller mouth ring

overhaul, should first check whether the seal is in good condition, and then measure the radial clearance. Radial clearance measurement, usually with vernier caliper and micrometer ( It is better to micrometer) Measure the inner diameter of the sealing ring and the impeller mouth ring diameter, the difference between the two is the radial clearance ( Radius direction clearance should take its half) 。 In order to make the measurement accuracy, shall be measured after several directions, averaging, lest sealing ring round, from measured data is small or large.

when the radial clearance more than the value specified in general use in repair. For a copper ring mouth with a sharply, when grinding large clearance, only need to hang a sharply, do not need to change the new ring. When the original sharply falls off phenomenon, the wear quantity is small, the repair welding repair methods are available. Repair welding procedure is as follows:

1) Brush away the dirt from the mouth ring;

       （ 2) Wash it again with 5% hydrochloric acid;

       （ 3) On the temperature of 90 ℃, the concentration of 10% caustic soda baptism in 10 minutes, then remove them in 90 ℃ water cleaning;

       （ 4) Repair welding sharply, the method is: transfer ring preheat to 100 ℃, with gas welding melt mouth ring on the original sharply, and then used with the original sharply with the brand of electrode made of sharply, smooth around the ring or the lengthwise direction road surfacing welding ( Shall not be repeated rewelding) 。 After welding, mechanical processing, can be performed to reach the required standard size. Such as sharply wear big or sharply is off, the heavier watering the sharply.

after the new mouth ring mount, should check it with the radial clearance is in line with the requirements of the impeller, and to look for friction phenomenon between the two. Its method is painted with red lead powder on impeller mouth ring, then turn the rotor, if mouth ring is stained with red lead powder, it must be repaired.

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