German Heliflex seals Heliflex models Heliflex prices

Heliflex seals are a common term for general seals, simply referring to the sealing of lubricating oil. It is a mechanical component used to seal grease (oil is the most common liquid substance in transmission systems, and also refers to general liquid substances), isolating the parts requiring lubrication in the transmission components from the output parts to prevent lubricating oil leakage. Seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals. The representative form of oil seals is the TC oil seal, which is a double-lip oil seal with a self-tightening spring fully covered by rubber. The term oil seal generally refers to this type of tc cased oil seal.

Heliflex 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 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 transported 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, worsening the operating environment, and heating the shaft journal or allowing steam to enter the bearing chamber, causing oil deterioration. Air leakage also destroys the vacuum, thereby increasing the pumping load, which reduces unit efficiency. For this reason, 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 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. 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 loss. 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 and causing main shaft bending.

Heliflex seal replacement steps

1) Remove the main pulley (belt drive) and remove the key pin; 2) Use a pin puller to remove the positioning 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, taking care 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; take care 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 circle of the shaft sleeve. Cold fit: Use a force bar to evenly knock the shaft sleeve in, padding the outside of the new shaft sleeve with an outer ring of the same size 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.

Heliflex seal specifications and applications

1) Standard single-lip type: Generally used for sealing mineral oil and water media in 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 conditions, 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 dust lips can prevent dust, resistant to media pressure<0.05MPa conditions, linear speed ≤ 15m/s. 3) Springless type: Single-lip inner-cased skeleton rubber oil seal without spring. Generally suitable for low-speed conditions, 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, good rigidity. Standard oil seals are used in environments with less dust and impurities, resistant to media pressure<0.05MPa conditions. Rotating axis linear speed ≤ 15m/s conditions. 5) Outer skeleton double-lip type: Double-lip exposed skeleton rubber oil seal with auxiliary lip, thin waist, good followability, high rigidity, good coaxiality. Standard oil seals with dust lips can prevent dust, resistant to media pressure<0.05MPa conditions. Speed ≤ 15m/s. 6) Assembled single-lip type: Outer skeleton oil seal assembled by rolling edges of inner and outer skeletons, featuring high installation precision, fast heat dissipation, and heavy-load characteristics. Suitable for heavy-load conditions under high temperature and high speed, media pressure ≤ 0.05MPa, maximum linear speed ≤ 15m/s. 7) Unidirectional return flow type right-hand rotation, left-hand rotation: Angled diagonal ribs are manufactured on the air side of the lip, utilizing fluid dynamics principles to produce a unidirectional pumping action with a return flow effect. Related to the rotation direction of the shaft, due to the return flow effect, the radial force is smaller than that of standard oil seals, reducing wear and heat generation, extending service life, suitable for media pressure<0.05MPa conditions, speed ≤ 20m/s. 8) Pressure-resistant type: Short lip, short and thick waist, providing pressure resistance, working pressure ≤ 3MPa. Suitable for conditions with media pressure ≤ 3MPa, suitable for shaft end oil seals of high-pressure pumps, generally PV value ≤ 8. Rotating axis linear speed ≤ 15m/s.

Weidou Intelligent Technology professionally sells German Heliflex seals, Heliflex O-rings, Heliflex sealing strips, Heliflex pipe seals, Heliflex cable seals, Heliflex rubber seals, Heliflex mechanical seals, Heliflex gaskets, Heliflex oil seals, Heliflex shaft seals, Heliflex metal seals, Heliflex high-pressure seals, Heliflex spiral seals, Heliflex centrifugal seals, Heliflex sealing rings, Heliflex original German imports. Welcome customers to inquire and order.