German jl breuer seals, jl breuer models, jl breuer prices

jl breuer seals are typical representatives of oil seals. The term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is to isolate lubricated components in transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcement bars in concrete components, providing strengthening and enabling the oil seal to maintain its shape and tension. Based on 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 as a dust shield, preventing external dust and impurities from entering the machine interior. Based on skeleton type, they can be classified as internally covered skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. Based on operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. They are used in gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

jl breuer 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, 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 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 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 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.

jl breuer 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, use a cutting machine to cut a groove on the shaft sleeve 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 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 machine head to allow lubricating oil to return to the front bearing and shaft seal.

jl breuer seal installation precautions

1) Pay close attention during installation to avoid installation deviations. Tighten the pressure cover after aligning the coupling. Bolts should be tightened evenly to prevent tilting of the pressure cover end face. Check each point with a feeler gauge; the error must not exceed 0.05 mm. Check the mating clearance (i.e., concentricity) between the pressure cover and the outer diameter of the shaft or shaft sleeve. It must be uniform all around. Check each point with a feeler gauge; the allowable error must not exceed 0.01 mm. 2) Spring compression must be performed according to regulations. Excessive or insufficient compression is not allowed. The required error is 2.00 mm. Excessive compression increases end-face specific pressure, accelerating end-face wear. Insufficient compression results in inadequate specific pressure, failing to achieve sealing. 3) After installing the moving ring, it should automatically spring back when pressed against the spring. 4) Installation position requirements: To ensure stable operation, long service life, and low leakage performance of the mechanical seal, it is crucial to install it correctly on the machine. When installing the mechanical seal on the machine, compare it carefully with the general assembly drawing before installation to confirm that all parts are ready. At this time, pay attention to any abnormalities such as scratches or damage on the sealing friction pair sealing surfaces and sealing rings. Also check for scratches on the shaft or shaft sleeve surfaces, flanges, and other components in contact with packing and sealing rings (O rings). If any abnormalities are found, they must be replaced or repaired before use. During actual installation, do not bring more parts than necessary to the site. Thus, if there are remaining parts after installation, it indicates missed installations; if parts are insufficient, it means unnecessary parts were assembled, serving as a self-check during installation.

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