German bock machining seals, bock machining models, bock machining prices

bock machining 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 components requiring lubrication in transmission parts from the external environment, preventing lubricant leakage. The skeleton acts like rebar in concrete components, providing reinforcement 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, impurities, etc., from entering the machine interior. Based on skeleton type, they can be divided into internally enclosed skeleton oil seals, externally exposed skeleton oil seals, and assembled oil seals. Based on operating conditions, they can be divided into rotary skeleton oil seals and reciprocating skeleton oil seals. Used for gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, and other locations.

bock machining seal classification

1) Packing seal: The packing seal has a simple structure, low price, and convenient maintenance. However, it has high leakage volume and high power loss. Therefore, packing seals are used for transporting general media, such as water; they are generally not suitable for petroleum and chemical media, especially valuable, flammable, explosive, or toxic media. 2) Mechanical seal: Mechanical seals (also known as face seals) offer good sealing performance, very low leakage, and long service life, but are expensive, with higher requirements for processing, installation, maintenance, and repair compared to general seals. Mechanical seals are suitable for transporting petroleum and chemical media and can be used for media with various viscosities, strong corrosiveness, and particulate content. The American Petroleum Institute standard API610 (8rd edition) stipulates that cartridge mechanical seals shall be installed unless otherwise specified by the user. 3) Dynamic seal: Dynamic seals can be divided into back-vane seals and auxiliary impeller seals. During pump operation, the centrifugal force of the back vanes (or auxiliary impeller) reduces the medium pressure at the shaft seal to atmospheric or negative pressure, preventing leakage during use. When stopped, the centrifugal force disappears, and the sealing effect of the back vanes (or auxiliary impeller) fails; at this point, the stationary sealing device provides the seal. Packing seals are commonly used in stationary sealing devices paired with back-vane (or auxiliary impeller) systems. Packing seals come in two types: standard and mechanically adjustable. Standard packing seals are similar to those in general packing seal pumps, requiring micro-positive pressure at the shaft seal to avoid dry friction of the packing. Mechanically adjustable packing seals use counterweights to loosen the packing during pump operation and tighten it when stopped. Dynamic seals offer reliable performance, low price, and convenient maintenance, suitable for transporting media with many solid particles, such as slurry pumps and feed slurry pumps in the phosphate industry. The disadvantages are higher power loss compared to mechanical seals and shorter service life of the stationary sealing device. The seal between the rotating pump shaft and the fixed pump casing is called the shaft seal. Its function is to prevent high-pressure liquid from leaking out along the shaft or external air from infiltrating along the shaft. For centrifugal pumps, the shaft seal is a dynamic seal. Based on whether the sealing surfaces contact, it can be divided into contact dynamic seals and non-contact dynamic seals. In contact dynamic seals, the sealing device contacts the shaft, resulting in relative friction. Contact dynamic seals include packing seals and mechanical seals.

bock machining seal operation

1) If slight leakage occurs after the pump starts, observe for a period. If the leakage does not decrease after continuous operation for 4 hours, stop the pump for inspection. 2) The pump operating pressure should be stable, with pressure fluctuations not exceeding 1 kg/cm². 3) During pump operation, avoid cavitation to prevent dry friction and damage to the sealing surfaces. 3) Regularly check the sealing condition. During operation, if leakage exceeds the standard (heavy oil not more than 5 drops/min, light oil not more than 10 drops/min), and there is no improvement within 2-3 days, stop the pump to inspect the sealing device.

bock machining seal failure causes

Mechanical seal failures are generally identified only after phenomena such as abnormal leakage, abnormal wear, or abnormal torque appear. The causes of failure can be broadly categorized into four aspects: 1) Incorrect design or selection of the mechanical seal; 2) Poor quality of the mechanical seal; 3) The precision of the machine using or installing the mechanical seal does not meet requirements; 4) Incorrect machine operation.

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