Use oil pump mechanical seal selection and equipment

Use oil pump mechanical seal selection and equipment Oil pump mechanical seals are classified as one of the basic mechanical components with precision and messy structure. They are mechanical seals for kettles, various pumps, reaction composition kettles, turbine compressors, submersible motors, etc. The key parts of the equipment. Its sealing function and service life depend on many factors, such as model selection, machine accuracy, and precise equipment application. 1. The selection method of oil pump mechanical seals. The oil pump mechanical seals are different according to the working conditions and the mechanical seals used in the medium. There are high temperature and low temperature resistant mechanical seals, high pressure and corrosion resistant mechanical seals, and particle medium resistant mechanical seals. For mechanical seals of light hydrocarbon media that are easy to vaporize, mechanical seals with different structures and materials should be selected according to different uses. The basic principles of selection are: 1. According to the pressure of the sealed cavity, it is judged that the sealed structure should be balanced or unbalanced, single-end face or double-end face, etc. 2. According to the working speed, it is judged to choose the rotary type or the stop type, the fluid dynamic pressure type or the non-contact type. 3. According to the temperature and fluid properties, determine the conflicting pair and auxiliary sealing materials, and accurately select the mechanical seal circulation protection system such as lubrication, flushing, heat preservation, and cooling. 4. According to the useful space sealed by the equipment, it is judged to choose multiple springs or single springs or wave springs, built-in or external. The main parameters of the selection are: sealed cavity pressure (MPA), fluid temperature (℃), working speed (M/S), fluid characteristics and useful space for equipment sealing, etc. 2. Equipment and application requirements of oil pump mechanical seals 1. Mechanical seal requirements for machine accuracy (take mechanical seals for pumps as an example) (1) The maximum radial runout tolerance of the shaft (or sleeve) of the mechanical seal of the equipment does not exceed 0.04～0.06MM. (2) The axial movement of the rotor does not exceed 0.3mm. (3) The maximum runout tolerance of the positioning end facing the shaft (or sleeve) surface of the sealing cavity and the sealing end cover does not exceed 0.04～0.06MM. 2. Confirmation of seals (1) Confirm whether the seal of the equipment is the same as the requested type. (2) Check carefully with the assembly drawing before the equipment to see if the number of parts is complete. (3) Choose a mechanical seal driven by a parallel spring. The spring can be divided into left and right rotation, which must be selected according to the rotation direction of the shaft. 3. Equipment and equipment methods vary with mechanical seal types and types of machines, but the essentials of the equipment are almost the same. The equipment process and precautions are as follows: (1) When determining the equipment standard, the equipment should be determined according to the product. Use instructions or samples to ensure equipment standards for mechanical seals. (2) Before installation, the shaft (sleeve) and gland should be free of burrs, and the bearing should be in good condition; the seals, shaft, seal cavity, and gland should be cleaned. In order to reduce the resistance, the parts of the mechanical seal of the equipment on the shaft should be coated with a thin layer of oil for lubrication. Taking into account the compatibility of the rubber O-ring, if it is not suitable to use oil, it can be coated with soapy water. The floating static ring has no anti-rotation pin structure, so it is not suitable to be oiled, and should be dry installed into the gland. (3) Install the static ring and gland on the shaft first, taking care not to collide with the shaft, and then install the moving ring assembly. The set screw of the spring seat or the transmission seat should be evenly tightened in several rounds. Before the gland is fixed, push the compensation ring by hand to axially tighten it. After loosening, the compensation ring can automatically spring back without jamming, and then press the The cover bolts are evenly locked.