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Mechanical seals with a sealing liquid lubricating and cooling systems
2012-01-10 by seoer1

(1) pumping cleaning liquid, the pipe clamps suppliers from the pump discharge leads, multi-stage pumps by the middle class to bring out the liquid through the connecting pipe and sealing ring of the sealing liquid inlet connected.
(2) If either of the following conditions shall be equipped with external sealing liquid supply system:
① pump suction height of more than 4.5m. At this point, a lot of air is not filtered through the stuffing box into the pump, to pump a great impact on the normal operation, sealing liquid pressure is 70? L72kPa.
② discharge pressure is lower than 0.07MPa. As the discharge pressure is too low, the pump outlet can not provide sufficient sealing liquid pressure.
③ delivery of hot water than 120 ℃, do not have sufficient cooling (except for boiler feed pump, because it can not use liquid ring seal).
④ conveying abrasive media containing solids, such as mortar, water, sewage, in order to put Gao packing, shaft or sleeve of life, reduce erosion, to be in place through the sealing liquid into the clean liquid. Cleaning fluid from an external supply, external sealing liquid pressure should be greater than the interior side of the packing pressure 70? 172kPa, but in order to reduce the dilution to be sealed in the sealing fluid between the ring and the packing room side to be set twice filler; also leads to the discharge from the pump liquid through the filter or centrifugal separator after the pass into the sealed liquid ring. Liquid ring seal between the rubber and the shaft shoulder pads, to prevent the cleaning solution and water, mud flow, see Figure 1. Rubber and packing boxes to be diameter, outside diameter of shaft or sleeve match.

⑤ heat pump wells and condensate vacuum pump when operating at 710mmHg.
⑥ transport non-aqueous media, such as acid, gasoline, honey or viscous fluid, while the seal chamber design has not addressed the special characteristics of these liquids considered.
(3) When the pump suction pressure below atmospheric pressure, such as condensation pump, to be returned in a sealed fluid suction pipeline creation throttle plate that heavy duty clamps liquid from the pump discharge leads to the pass into the box packing, stuffing box out from the sealing liquid and then flows through the orifice of the suction pump to prevent air leakage were sealed fluid pump and control flow.
(4) sealed room than medium pressure 103kPa, temperature below 90 ℃, if the packing seal at a sufficient amount of leakage of fluid through, do not use cooling measures.
(5) sealed room than medium pressure 345kPa, temperature below 118 ℃, the liquid in a closed loop cooling liquid at the required access. Coolant flow 3.78L/min, lower pressure than the medium pressure 34kPa.
(6) sealed room than medium pressure 690kPa, temperature below 131 ℃, the liquid in a closed loop cooling liquid at the required access. Coolant flow 3.78L/min, lower pressure than the pressure medium 34kP, but also need to use padding jacket cooling.
(7) If the seal is easily solidified medium, the pump before the start, take place prior to the sealed chamber to heat. Available in a sealed room at the resistivity with steam or hot.
(8) If the seal is already dissolved solids, they may have wear problems. It is necessary to raise or lower the sealing room temperature, to ensure that all the solid dissolved.

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