German bode seals bode models bode prices

bode seals are materials or components that prevent leakage of fluids or solid particles from between adjacent mating surfaces and prevent external contaminants such as dust and moisture from entering machinery. The recommended storage temperature for seals is below 30 °C to avoid high-temperature aging. Seals are classified into two main categories: static seals and dynamic seals. Their primary function is to prevent leakage of fluids or solid particles from between adjacent mating surfaces and to prevent external contaminants such as dust and moisture from entering machinery. Static sealing refers to the tight closure of sealed chambers or containers, used for sealing letters and testamentary seals.

bode seal functions

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 leakage 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 not equal to the external atmospheric pressure, steam inside the cylinder or air outside the cylinder will inevitably leak out or in along the radial gap between the main shaft and the cylinder, causing working fluid loss, deteriorating the operating environment, heating the shaft journal, or allowing steam to enter the bearing housing, causing oil deterioration. Air leakage also breaks the vacuum, increasing the exhaust load, which reduces unit efficiency. Therefore, shaft seals are installed where the rotor passes through both ends of the cylinder. This type of shaft seal is called an end shaft seal, abbreviated as shaft seal. High-pressure shaft seals prevent steam from leaking out of the cylinder, and low-pressure shaft seals prevent air from leaking into the cylinder. 2) During turbine operation, some steam inevitably leaks from the shaft end to the atmosphere, causing loss of working fluid and heat, and also affecting the working environment of the turbogenerator. If adjusted improperly, excessive steam leakage will cause the bearing temperature near the shaft seal to rise or water to enter the bearing oil. Therefore, shaft seal heaters are installed in various units to recover and utilize the shaft seal leakage steam 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, heating it and causing bearing overheating. Prevent air from leaking into the vacuum part of the cylinder. Ensure condenser vacuum effect and degree during unit startup. Recover shaft seal and valve stem leakage to reduce working fluid and energy losses. 4) During turbine tripping shutdown and the entire hot shutdown process where the condenser needs to maintain vacuum, prevent air from leaking into the turbine, accelerating internal cooling of the turbine, causing main shaft bending.

bode 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 slot on the shaft sleeve with a cutting machine and knock it down with a chisel; note to 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; be careful not to 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 (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 force bar to evenly knock the shaft sleeve in; pad the outside of the new shaft sleeve with an outer ring of the same size to knock it in to avoid damaging the shaft sleeve. Hot fit: Clean the inside of the shaft sleeve thoroughly, ensuring 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 head so that lubricating oil returns to the front bearing and shaft seal.

bode seal maintenance

1) Control of shaft seal pressure: High shaft seal pressure easily causes steam venting from the shaft seal, which can lead 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 fluid and damaging equipment. 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 shaft seal and rotor shaft seal section, producing local stress concentration, leading to certain deformation, which may change the gap between the rotor and cylinder, increase shaft seal steam leakage, increase expansion difference, and potentially cause serious stationary-to-rotating part friction. When the shaft seal temperature is too low, the shaft end shaft seal and rotor shaft seal section will be cooled, similarly producing local stress concentration, changing the gap between the cylinder and rotor, increasing shaft end air leakage, and decreasing expansion difference. Low shaft seal temperature may also cause water carryover in the shaft seal supply steam, leading to water hammer in the shaft seal supply pipeline. In severe cases, this can cause water ingress into the turbine.

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