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Busch seals are sealing devices installed to prevent leakage between the pump shaft and the casing. Common shaft seal types include packing seals, mechanical seals, and dynamic seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and dynamic seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and dynamic seals.

Busch seal principle

Since there is an oil film controlled by the lip of the oil seal between the oil seal and the shaft, this oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes the end in contact with air to form a meniscus, preventing leakage of the working medium and thereby achieving sealing of the rotating shaft. The sealing capability of the oil seal depends on the thickness of the oil film on the sealing surface; if the thickness is too great, the oil seal will leak; if the thickness is too small, dry friction may occur, causing wear on the oil seal and shaft; if there is no oil film between the sealing lip and the shaft, it is easy to cause heating and wear. Therefore, during installation, some oil must be applied to the sealing ring, and it must be ensured that the skeleton oil seal is perpendicular to the shaft axis. If it is not perpendicular, the sealing lip of the oil seal will drain the lubricating oil from the shaft, which will also lead to excessive wear of the sealing lip. During operation, it is ideal for a small amount of lubricant in the casing to seep out slightly to achieve the state of forming an oil film at the sealing surface.

Busch seal applications

Skeleton oil seals are widely used in industries such as aviation, automotive, motorcycles, railways, vehicles, ships, home appliances, and construction machinery. They are suitable for sealing in rotary and reciprocating motion. They are installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other components. They mainly prevent the penetration of sealed media (gas, liquid) and the entry of external foreign matter into the body. Precautions: The pressure-bearing range of ordinary oil seals is very limited, generally 0.03 MPa. This pressure is generally formed by the height difference of the lubricating oil itself. If higher pressure needs to be sealed, high-pressure oil seals (generally capable of withstanding up to 1 MPa pressure) or other sealing forms should be selected.

Busch seal common questions

Zero leakage in sealing is the perpetual pursuit of chemical equipment, and it is this requirement that has promoted 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 the service life issues of magnetic drive pump isolation cans and canned motor pump shielding cans, material pitting corrosion issues, the need for corrosion-resistant sealing materials, and the reliability issues of static seals, etc. A brief introduction to some basic situations regarding sealing is as follows: 1. Sealing forms For static seals, there are usually 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 mainly on mechanical seals. Mechanical seals are divided into single-face and double-face, balanced and unbalanced types. Balanced types are suitable for sealing high-pressure media (usually 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. Isolation fluid should be injected into the seal chamber of double-face mechanical seals, with its pressure generally 0.07 to 0.1MPa higher than the medium pressure. 2. Sealing materials The materials for static seals in chemical pumps are generally fluororubber, with PTFE materials used only in special cases; the material configuration of the stationary and rotating rings of mechanical seals is critical. It is not necessarily best to pair cemented carbide with cemented carbide; high cost is one aspect, and it is also unreasonable if there is no hardness difference between the two. Therefore, it is best to treat them differently according to the characteristics of the medium (Note: The American Petroleum Institute API610 Eighth Edition has relatively detailed provisions for typical configurations of mechanical seals and piping systems in Appendix D).

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