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Advantages of mechanical seal-
by：Lepu Seal
2021-04-18
Advantages of mechanical seal
2017-07-04
Advantages of mechanical seal:
Compared with traditional radial contact seals (such as soft packing seals), mechanical seals have the following technical advantages:
(1) Tightness-the amount of medium leakage can be limited to little or no leakage
As long as the surface roughness and flatness of the main sealing surface can meet the requirements and the material has good wear resistance, the mechanical seal can achieve very little leakage, even invisible to the naked eye.
JB4127.1—1999 'Technical Conditions of Mechanical Seals' stipulates that the leakage requirement is that when the sealed medium is liquid, the average leakage is specified as follows: When the outer diameter of the shaft (or sleeve) is greater than 50mm, the leakage will occur all over again. : Not more than 5 positive ml/h; when the outer diameter of the shaft (or sleeve) is not more than 50mm, the leakage is not more than this limit for special conditions and when the sealed medium is gas.
Especially for the successful application of non-contact gas film seal and liquid film seal, H7N mechanical seal realizes zero leakage of the liquid phase and zero escape of the process fluid, meeting the practical requirements of safe and environmentally friendly production.
(2) Reliability-long life
In mechanical seals, the main wear part is the end face of the seal friction pair. Because the wear on the end face of the seal is not large under normal working conditions, it can be used continuously for 1 to 2 years, and it can also be used for 5 to 10 years in some cases. .
JB4127.1—1999 'Technical Conditions for Mechanical Seals' stipulates that under the condition of reasonable selection and correct installation and use, when the sealed medium is water, oil and similar media, the service life of the mechanical seal is generally not Less than 1 year. When the sealed medium is a corrosive medium, the service life of the mechanical seal is generally six months to one year. But it is not subject to this limit when the conditions of use are harsh.
API682 'Shaft Seal System for Centrifugal Pump and Rotor Pump' stipulates that the mechanical seal has a service life of more than 3 years.
(3) Stability-No need to adjust during operation
Since the mechanical seal relies on the spring force and fluid pressure to make the friction pair fit, it automatically maintains contact during operation, and there is no need to adjust the compression like ordinary soft packing after assembly.
(4) Vibration resistance-better than radial seal
Generally, the maximum radial amplitude of radial seals does not exceed 0.05mm at the speed of nu003d3000r/min; the radial amplitude of mechanical seals can exceed this value. The mechanical seals developed abroad for kettles can allow the shaft diameter The amount of deflection is up to (one side).
(5) Applicability-the use value is constantly improving
Mechanical seals can use balanced seals, hydrostatic seals, hydrodynamic seals, or multi-stage combined seals. The working pressure of a single-stage seal can reach 45 MPa, and the value can reach 1000 MPa·m/s. improve.
However, compared with other seals, mechanical seals still have many disadvantages. The mechanical seal has a large number of components and a complex structure, which brings inconvenience to the installation and maintenance of the field staff. Especially when the mechanical seal fails to be checked and repaired, the whole set of equipment has to be stopped and completely disassembled, which affects the normal production. In order to solve this problem, cartridge mechanical seals and split mechanical seals that are easy to disassemble and assemble and can guarantee the quality of assembly have been developed and widely used. 520.html,
Mechanical seals are classified according to the principle of action and structure Sealing surface gap of mechanical seals
2017-07-04
Advantages of mechanical seal:
Compared with traditional radial contact seals (such as soft packing seals), mechanical seals have the following technical advantages:
(1) Tightness-the amount of medium leakage can be limited to little or no leakage
As long as the surface roughness and flatness of the main sealing surface can meet the requirements and the material has good wear resistance, the mechanical seal can achieve very little leakage, even invisible to the naked eye.
JB4127.1—1999 'Technical Conditions of Mechanical Seals' stipulates that the leakage requirement is that when the sealed medium is liquid, the average leakage is specified as follows: When the outer diameter of the shaft (or sleeve) is greater than 50mm, the leakage will occur all over again. : Not more than 5 positive ml/h; when the outer diameter of the shaft (or sleeve) is not more than 50mm, the leakage is not more than this limit for special conditions and when the sealed medium is gas.
Especially for the successful application of non-contact gas film seal and liquid film seal, H7N mechanical seal realizes zero leakage of the liquid phase and zero escape of the process fluid, meeting the practical requirements of safe and environmentally friendly production.
(2) Reliability-long life
In mechanical seals, the main wear part is the end face of the seal friction pair. Because the wear on the end face of the seal is not large under normal working conditions, it can be used continuously for 1 to 2 years, and it can also be used for 5 to 10 years in some cases. .
JB4127.1—1999 'Technical Conditions for Mechanical Seals' stipulates that under the condition of reasonable selection and correct installation and use, when the sealed medium is water, oil and similar media, the service life of the mechanical seal is generally not Less than 1 year. When the sealed medium is a corrosive medium, the service life of the mechanical seal is generally six months to one year. But it is not subject to this limit when the conditions of use are harsh.
API682 'Shaft Seal System for Centrifugal Pump and Rotor Pump' stipulates that the mechanical seal has a service life of more than 3 years.
(3) Stability-No need to adjust during operation
Since the mechanical seal relies on the spring force and fluid pressure to make the friction pair fit, it automatically maintains contact during operation, and there is no need to adjust the compression like ordinary soft packing after assembly.
(4) Vibration resistance-better than radial seal
Generally, the maximum radial amplitude of radial seals does not exceed 0.05mm at the speed of nu003d3000r/min; the radial amplitude of mechanical seals can exceed this value. The mechanical seals developed abroad for kettles can allow the shaft diameter The amount of deflection is up to (one side).
(5) Applicability-the use value is constantly improving
Mechanical seals can use balanced seals, hydrostatic seals, hydrodynamic seals, or multi-stage combined seals. The working pressure of a single-stage seal can reach 45 MPa, and the value can reach 1000 MPa·m/s. improve.
However, compared with other seals, mechanical seals still have many disadvantages. The mechanical seal has a large number of components and a complex structure, which brings inconvenience to the installation and maintenance of the field staff. Especially when the mechanical seal fails to be checked and repaired, the whole set of equipment has to be stopped and completely disassembled, which affects the normal production. In order to solve this problem, cartridge mechanical seals and split mechanical seals that are easy to disassemble and assemble and can guarantee the quality of assembly have been developed and widely used. 520.html,
Mechanical seals are classified according to the principle of action and structure Sealing surface gap of mechanical seals
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