Since 2006, Focus on rubber seals

Assembly and raw materials of seals

by:ORK      2022-10-24
1. The sealing ring does not need to tear off the packaging bag prematurely before installation, so as to prevent dirt from adhering to the surface of the sealing ring and bringing it to work. 2. Before the one-key installation, the sealing ring should be properly wiped with lithium ester with molybdenum disulfide in the middle of the skirt to prevent the shaft from starting in an instant, causing dry wear on the skirt and jeopardizing the clearance fit of the skirt. quantity, and as soon as possible, to the assembly line. The sealing ring seat with the sealing ring installed, if it is not installed with one button immediately, it is recommended to cover it with a cloth to prevent dirt from adhering to the sealing ring. Hands or special tools coated with lithium-based grease must be washed. 3. The sealing ring should be installed flat, and there should be no skew problem. It is recommended to use steam pressure equipment or special tools for sleeve specifications for installation. The work pressure does not have to be very high, and the speed should be balanced and slow. 11. For the machinery and equipment of the J-type frameless seal installed this time, make a mark to facilitate tracking, pay special attention to all steps to select the seal ring, and select the seal ring type and raw material according to the working standard of the sealing medium. The working standard mainly takes into account the application working pressure, the working line speed, and the operating temperature range. When selecting the material of the sealing ring, it is necessary to consider the compatibility of the material with the medium in operation, the adaptability to the operating temperature range, and the ability of the lip to follow the arc during high-speed operation. Usually, the temperature of the lip of the sealing ring is 30~60 °C higher than the temperature of the medium during operation. Special attention should be paid when selecting the raw material of the sealing ring. Under the same diameter standard, J-type skeletonless seals produced from different raw materials have different working capabilities of integrating the rotational speed of the shaft surface. The applied working pressure of the general sealing ring usually does not exceed 0.05MPa. When the pressure exceeds this value, the breakdown voltage type seal should be used. The working scope of the sealing ring is related to the raw material used for the sealing ring: when the raw material is nitrile rubber seals (NBR), it is—50~130℃, Acrylic Vulcanized (ACM)—40~190℃, Fluorine (FPM)—20~400℃. Sealing ring is a hardware and mechanical component. Improper assembly line and storage will harm performance indicators. The sealing ring should be stored to avoid dust, rust and deformation. The frameless seal should not be directly exposed to the sun, and it should not be extruded. For the sealing ring installed on the shaft, avoid corrosion of the shaft and the seat groove of the sealing ring. Pay special attention to the following matters when installing and disassembling the sealing ring: (1) When installing the sealing ring, the compressor oil or grease should be applied, and the bearing end cover and shaft shoulder should be rounded. (2) When installing the sealing ring, the housing at the lip end must face the compressor lubricating oil to be sealed, and do not assemble the line in the opposite direction. (3) When the oil seals the seating hole, a tool should be used to squeeze it in to avoid tilting the part. (4) Various countermeasures should be taken to avoid lip damage to the external thread, keyway, spline, etc. of the sealing ring lip, and the tool assembly line should be used. Common problems in the skeleton seal assembly line: 4. The total number of fixed sealing rings received. 6. From the U-shaped frameless seal to the assembly line, it must be kept clean. 7 Before the assembly line, do a good job of checking the sealing ring and measure it well Whether the specifications of each position of the skeleton seal are consistent with the specifications of the shaft and the waveguide. Before installing the sealing ring, the specifications of the shaft diameter and the nominal diameter of the sealing ring should be clearly compared and must be consistent. The size of the cavity body should be suitable for the diameter and total width of the sealing ring. Check that the skirt of the sealing ring is damaged or deformed, and the elastic yellow or wood has fallen off and corroded. Avoid the damage of the roundness of the sealing ring without being placed in the whole process of transportation, extrusion and collision due to external force, and damage its roundness. 8. Do a good job of machining inspection data before the assembly line. Measure the specifications of each part of the waveguide and shaft Is it appropriate? Especially the inner rounded corners. There can be no inclination. The inner hole of the shaft and the waveguide should be smooth, and the rounded corners should be free of damage and burrs. Clean the assembly line position. There should be no burrs, gravel, iron pins and other dirt in the fillet) part, which will cause damage to the arc of the skirt of the sealing ring. 0. In terms of operation method, you can feel it with your hand to see if it is smooth and round.
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