German REINZ seals REINZ models REINZ prices

REINZ seals are a common term for general seals, simply referring to the sealing of lubricating oil. They are mechanical components 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 oil seals commonly referred to are usually this type of tc skeleton oil seal.

REINZ 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 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, worsening the operating environment, and heating the shaft journal or allowing steam to enter the bearing chamber, causing deterioration of oil quality. Leaking air also destroys the vacuum, thereby increasing the pumping load, which will reduce the 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 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 the adjustment is improper and the steam leakage is excessive, it will also cause the temperature of the 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 fluid and energy losses. 4) During the turbine trip shutdown and the entire hot shutdown process where the condenser needs to maintain a vacuum, prevent air from leaking into the turbine, accelerating internal cooling of the turbine and causing main shaft bending.

REINZ 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, noting 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 some oil or high-temperature lubricating 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 machine head to allow lubricating oil to return to the front bearing and shaft seal.

REINZ seal common issues

The perpetual pursuit for chemical equipment is achieving leak-free sealing, which has driven the increasingly widespread application of magnetic drive pumps and canned motor pumps. However, there is still a long way to go to truly achieve zero leakage, such as addressing the service life of isolation cans in magnetic drive pumps and shielding cans in canned motor pumps, material pitting corrosion issues, the need for sealing materials with good corrosion resistance, and the reliability of static seals. The following provides a brief introduction to basic conditions regarding sealing: 1. Sealing types For static seals, there are typically only two forms: gaskets and O-rings, with O rings being the most widely used; for dynamic seals, chemical pumps rarely use packing seals, relying primarily on mechanical seals. Mechanical seals are further classified into single-face and double-face, as well as balanced and unbalanced types. Balanced types are suitable for sealing high-pressure media (typically referring to pressures greater than 1.0MPa). Double-face mechanical seals are mainly used for media that are high-temperature, prone to crystallization, viscous, contain particles, or are toxic and volatile. For double-face mechanical seals, a barrier fluid should be injected into the seal chamber, with its pressure generally higher than the medium pressure by 0.07 to 0.1MPa. 2. Sealing materials The material for static seals in chemical pumps is generally fluororubber, with polytetrafluoroethylene materials used only in special cases. The material configuration of the rotating and stationary rings in mechanical seals is critical. It is not necessarily optimal to pair cemented carbide with cemented carbide; besides the high cost, it is unreasonable if there is no hardness difference between the two. Therefore, it is best to select materials based on the characteristics of the medium (Note: The American Petroleum Institute API610 Eighth Edition provides relatively detailed specifications for typical configurations of mechanical seals and piping systems in Appendix D).

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