German Hilge seals Hilge models Hilge prices

Hilge seals are a typical representative of oil seals; generally, the term oil seal refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. According to structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves a dust-proof function, preventing external dust, impurities, etc., from entering the machine interior. According to skeleton type, they can be divided into inner-encased skeleton oil seals, exposed skeleton oil seals, and assembled oil seals. According to operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. Used for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

Hilge 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 relatively small position 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 fire, explosion, 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 along the radial gap between the main shaft and the cylinder, causing working fluid loss, deteriorating the operating environment, and heating the journal or allowing steam to enter the bearing chamber, causing oil quality deterioration. Leaking air also destroys the vacuum, thereby increasing the pumping load; these factors will reduce 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 are used to prevent steam from leaking out of the cylinder, and low-pressure shaft seals are used to prevent air from leaking into the cylinder. 2) During turbine operation, a portion of steam will inevitably leak from the shaft end to the atmosphere, causing loss of working fluid and heat, and also affecting the working environment of the turbogenerator. If adjustment is improper and steam leakage is excessive, it will also 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 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 a vacuum, prevent air from leaking into the turbine, which would accelerate internal cooling of the turbine and cause main shaft bending.

Hilge 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 in 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; note 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 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 ring of the shaft sleeve. Cold fit: Use a force 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 to 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 headstock to allow lubricating oil to return to the front bearing and shaft seal.

Hilge seal specifications and applications

1) Standard single-lip type: Generally used for sealing mineral oil, water, and other media on high and low-speed rotating shafts and reciprocating motion. Standard oil seals are used in environments with less dust and impurities, resistant to media pressure<0.05MPa occasions, maximum linear speed 15m/s, reciprocating motion speed<0.1m/s. 2) Standard double-lip type: In addition to the usage characteristics of the above-mentioned S type oil seals, it can also provide dust protection. Standard oil seals with a dust-proof lip can prevent dust, resistant to media pressure<0.05MPa occasions, linear speed ≤ 15m/s. 3) Springless type: Springless single-lip inner-encased skeleton rubber oil seal. Generally suitable for low-speed conditions where the sealing medium is lubricating grease. Linear speed ≤ 6m/s. 4) Outer skeleton single-lip type: Single-lip exposed skeleton rubber oil seal with spring, thin waist, good followability, and good rigidity. Standard oil seals are used in environments with less dust and impurities, resistant to media pressure<0.05MPa occasions. Rotating axis linear speed ≤ 15m/s conditions. 5) Outer skeleton double-lip type: Double-lip exposed skeleton rubber oil seal with secondary lip, thin waist, good followability, high rigidity, and good coaxiality. Standard oil seals with a dust-proof lip can prevent dust, resistant to media pressureFor applications with 0.05MPa. Rotational speed ≤ 15m/s. 6) Assembled single-lip type: An outer skeleton oil seal assembled from inner and outer skeletons with rolled edges, featuring high installation precision, rapid heat dissipation, and heavy-load characteristics. Suitable for heavy-duty operating conditions under high temperature and high speed, with medium pressure ≤ 0.05MPa and maximum linear speed ≤ 15m/s. 7) Unidirectional return flow type, right-hand and left-hand rotation: Angled diagonal ribs are manufactured on the air side of the lip, utilizing fluid dynamics principles to generate a unidirectional pumping action with a return flow effect. Dependent on the shaft's direction of rotation, the return flow effect results in lower radial force compared to standard oil seals, reducing wear and heat generation and extending service life. Suitable for medium pressure<0.05MPa occasions, rotational speed ≤ 20m/s. 8) Pressure-resistant type: Short lip, short and thick waist, providing pressure resistance, working pressure ≤ 3MPa. Suitable for occasions with media pressure ≤ 3MPa, suitable for shaft end oil seals of high-pressure pumps; generally, the PV value ≤ 8. Rotating axis linear speed ≤ 15m/s.

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