Below is a discussion on the selection method for high-temperature hydraulic press seals
Release time:
2023-02-02
Below, we will discuss the selection methods for high-temperature hydraulic press seals
I. High-Temperature Hydraulic Press Sealing Requirements
1. Select high-temperature resistant sealing materials.
At high temperatures, the temperature resistance of the hydraulic press is particularly important. Rational selection of sealing data allows the seals of general hydraulic press structures to still be suitable for high-temperature operating conditions, simplifying procedures and saving costs.
2. Use metal bellows type hydraulic seals or a combined sealing structure of metal bellows and ordinary hydraulic seals.
From the perspective of heat resistance, the auxiliary sealing ring is a weak link in the hydraulic press seal. When the temperature exceeds 80℃, general rubber is not suitable; above 230-250℃, polytetrafluoroethylene cannot be used. In addition, the tension spring will be blocked due to high temperature and the accumulation of flammable media. Therefore, when the temperature exceeds 220℃, a metal bellows type hydraulic press seal should be used, or a combination of metal bellows and ordinary hydraulic press seals can be used.
3. Use cooling methods
At high temperatures, to ensure reliable operation of the seal, the hydraulic press seal should be cooled as much as possible, and the temperature inside the sealing gap needs to be kept below the vaporization temperature of the sealing fluid.
The cooling method controls the temperature of the seal. Commonly used temperature controls include flushing, blocking seals, and enhanced fluid circulation, etc. (See Chapter 7 Temperature Control Equipment). The following methods can also be selected at high temperatures.
(1) Use Diphy1 (a mixture of diphenyl and diphenyl ether) as the enclosed liquid, for a cold, non-pressure heat exchanger (the enclosed liquid is transported by a pump-efficient screw);
(2) When there may not be a suitable liquid at high temperatures, nitrogen and argon can also be introduced to avoid oxidation caused by air.
4. Embedded conflict sub-problems
Embedding makes full use of the characteristics of end-face data and matrix data to improve the application value of the data. High-temperature sealing generally uses the hot embedding method, but due to the difference in the thermal expansion coefficient between the end-face wear-resistant data and the matrix data, when used at high temperatures, the retaining ring will loosen and fall off. Therefore, special attention should be paid to the temperature of the conflict ring selected for the embedding structure. The reason for the loosening and falling off of the hot-embedding structure is related not only to the operating temperature but also to the diameter of the shaft. When the matrix of the conflict ring is stainless steel, high-nickel alloy, or Qin alloy, the relationship between the allowable operating temperature of the hot-embedded cemented carbide and different shaft diameters.
5. Allowable clearance between the conflict ring and the shaft
At high temperatures, due to the different thermal expansion coefficients of the conflict ring and the shaft, the gap between the conflict ring and the shaft approaches zero, causing the buoyancy of the conflict ring to disappear, leading to seal failure. Therefore, the gap between the conflict ring and the shaft needs to be selected reasonably and correctly during design.
The above is the explanation of "Selection Methods for High-Temperature Hydraulic Press Seals". Did everyone understand? If you want to learn more, please feel free to contact us. Thank you for watching, and see you next time.
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