German borscheid wenig seals, borscheid wenig models, borscheid wenig prices

borscheid wenig seals are devices that prevent fluid leakage, consisting of at least one pair of end faces perpendicular to the rotation axis. These faces remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, along with the assistance of auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are sometimes used as auxiliary seals; however, since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mechanical seals".

Function of borscheid wenig seals

Prevent high-pressure liquid from leaking out of the pump and prevent air from entering the pump. Although the shaft seal occupies a small space in the pump, the normal operation of the pump is closely related to the shaft seal. If the shaft seal is improperly selected, it will not only require frequent maintenance during operation and cause significant loss of the conveyed liquid, but may also cause fires, explosions, and poisoning accidents due to the leakage of flammable, explosive, and toxic liquids, with unimaginable consequences. Therefore, the shaft seal structure must be reasonably selected to ensure the safe operation of the pump. 1) Since the pressure inside the cylinder is unequal to the external atmospheric pressure, steam inside the cylinder or air outside the cylinder will inevitably leak out or in through the radial clearance between the main shaft and the cylinder, causing working medium loss, deteriorating the operating environment, and heating the shaft journal or allowing steam to enter the bearing chamber, causing oil quality deterioration. Air leakage also destroys the vacuum, thereby increasing the exhaust load, which reduces unit efficiency. For this reason, shaft seals are installed where the rotor passes through both ends of the cylinder; these are called shaft end seals, abbreviated as shaft seals. High-pressure shaft seals prevent steam from leaking out of the cylinder, while low-pressure shaft seals prevent air from leaking into the cylinder. 2) During turbine operation, a portion of steam inevitably leaks from the shaft end to the atmosphere, causing loss of working medium and heat, and also affecting the working environment of the turbogenerator. If adjustment is improper and steam leakage is excessive, it will cause the temperature of bearings near the shaft seal to rise or water to enter the bearing oil. For this reason, shaft seal heaters are installed in various units to recover and utilize the shaft seal steam leakage from the turbine. 3) Prevent steam inside the cylinder and valve stem leakage from leaking outward, polluting the turbine room environment and bearing lubricating oil quality. Prevent high-temperature steam from flowing over the turbine main shaft during normal unit operation, causing it to heat up and thus causing bearing overheating. Prevent air from leaking into the vacuum part of the cylinder. Ensure the vacuum effect and degree of the condenser during unit startup. Recover shaft seal and valve stem leakage to reduce working medium and energy losses. 4) During turbine tripping shutdown and the entire hot shutdown process where the condenser needs to maintain a vacuum, prevent air from leaking into the turbine, which would accelerate internal cooling of the turbine and cause main shaft bending.

borscheid wenig seal replacement steps

1) Remove the main pulley (belt drive) and remove the key pin; 2) Use a pin puller to remove the locating pins of the shaft seal end cover; 3) Remove the fixing screws of the shaft seal end cover; 4) Use a circular external puller to remove the shaft sleeve (if no puller is available, cut a groove on the shaft sleeve with a cutting machine and knock it down with a chisel; note: block sand with something to prevent it from getting into the screw rod); 5) Remove the old shaft seal; 6) Clean the end cover shaft seal and bearing positions, then clean with 755; 7) Apply 638 adhesive to the shaft seal installation position, then carefully install the shaft seal; note: do not damage the rubber lip; you can apply a little oil or high-temperature grease to the rubber surface of the shaft seal; 8) After cleaning the shaft sleeve position, reinstall and fix the end cover securely (you can wrap a layer of thick glossy paper around the shaft to prevent the shaft seal lip from accidentally touching the keyway during end cover installation); 9) Clean the new shaft sleeve and installation position, apply fixing adhesive 638 to the inner circle of the shaft sleeve. Cold fit: Use a forcing bar to evenly knock the shaft sleeve in; place an outer ring of the same size outside the new shaft sleeve to cushion the knocking and avoid damaging the shaft sleeve. Hot fit: Clean the inside of the shaft sleeve thoroughly; there must be no oil. Apply a ring of 638 adhesive to the shaft journal before the shaft seal, heat the shaft sleeve to 110 degrees, and install it. (Note: Push the shaft sleeve to the edge of the shaft seal, pause briefly. Wait for the temperature to drop before pushing it into the shaft seal position; 10) Install the pulley or coupling, correct parallelism or centerline, and manually reverse the machine head to allow lubricating oil to return to the front bearing and shaft seal.

borscheid wenig seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure can easily cause steam emission from the shaft seal, leading to water ingress into the oil and deterioration of turbine oil quality. Excessively high shaft seal pressure will trigger the action of the equalizing box safety valve, wasting working medium and damaging equipment. Too low shaft seal pressure may cause a drop in unit vacuum, allowing cold air to enter the shaft seal or even the cylinder, causing cooling of the shaft seal section or inside the cylinder, seriously threatening equipment safety. 2) Impact of abnormal shaft seal temperature on the unit: When the shaft seal temperature is too high, especially before unit startup, excessive heat will cause intense heating at the shaft end seal and rotor seal section, producing local stress concentration, leading to certain deformation, which may change the clearance between the rotor and cylinder, increase shaft seal steam leakage and differential expansion, and potentially cause serious stationary-to-rotating part friction. When the shaft seal temperature is too low, the shaft end seal and rotor seal section will be cooled, similarly producing local stress concentration, changing the clearance between the cylinder and rotor, increasing shaft end leakage, and reducing differential expansion. When the shaft seal temperature is too low, the shaft seal supply steam may carry water, causing water hammer in the shaft seal supply pipeline. In severe cases, this leads to water ingress into the turbine.

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