What does it mean to seal oil?

The sealing oil serves as a buffer fluid, and the circulation principle is based on thermosiphon effect. An oil seal is a mechanical component used to seal oil – oil being the most common liquid in transmission systems, and also referring to liquids in general – it isolates the parts that require lubrication within the transmission system from the output components, preventing lubricant from leaking. Based on aspects such as its sealing function, characteristics, structural types, operating conditions, and sealing mechanism, oil seals can take various forms and be referred to by different names; however, conventionally, the lip seal used around rotating shafts is called an oil seal, while seals used for static sealing or dynamic sealing (typically in reciprocating motion) are referred to as sealing elements. The representative type of oil seal is the TC oil seal, which is a double-lip oil seal with a self-tightening spring and entirely covered in rubber; when people talk about oil seals, they usually refer to this type of TC frame oil seal.

An oil seal is a mechanical component used to seal oil – oil being the most common liquid in transmission systems, and also referring to liquids in general – it isolates the parts that require lubrication within the transmission system from the output components, preventing lubricant from leaking.

It seems that the oil sealing process mentioned upstairs is different from what was described on the first floor. Why does the hot oil pump require oil sealing, while the cold oil pump does not?

An oil seal is a common term for sealing components; as the name implies, it is a mechanical element used to seal oil. Based on aspects such as their sealing function, characteristics, structural types, operating conditions, and sealing mechanisms, oil seals can be classified into various forms and given different names; however, conventionally, lip seals used around rotating shafts are referred to as oil seals, while seals used for static sealing or dynamic sealing (in cases of reciprocating motion) are called sealing elements. Generally, it doesn’t make much sense to distinguish in the definition of seals. More emphasis is placed on the practical application of oil seals and their role in preventing leaks in sealing devices. A skeleton oil seal is relatively simple and generally consists of three parts: the oil seal body, a reinforcing skeleton, and a self-tightening helical spring. Seals are further divided into different parts such as the bottom, waist, cutting edge, and sealing lip. The skeleton acts like the rebar in concrete elements, providing reinforcement and helping the oil seal to maintain its shape and tension. Generally, in a free state, the inner diameter of a skeleton oil seal is smaller than the shaft diameter, meaning it has a certain amount of \"interference\". Therefore, once the oil seal is installed in the seal seat and on the shaft, the pressure at the edge of the oil seal together with the contracting force of the self-tightening coil spring exerts a certain radial tightening force on the shaft. After operating for a while, this pressure decreases rapidly or even disappears; thus, the spring can compensate for the self-tightening force of the oil seal at any time.

Simply put, seal oil is the oil used to cool and flush the mechanical seal of hot oil pumps.

The sealing oil serves as a buffer fluid, and the circulation principle is based on thermosiphon effect. The sealing oil in use is generally 0.2 kilograms higher than the medium. It is to prevent the medium pumped by the pump from being discharged directly into the external environment in the event of a leakage in the mechanical seal.

Generally, the purpose of injecting seal oil into a hot oil pump is to remove the heat generated between the rubbing surfaces of the mechanical seal, thereby reducing the temperature at those surfaces； The second reason is to enable the mechanical seal to operate in a favorable working environment. Pump flushing is divided into self-flushing, external flushing, and through-flushing. Generally, paraffin oil is used as the flushing oil for external flushing of hot oil pumps; it is injected by a flushing oil pump, and the pressure is regulated by a throttle valve, usually being 0 higher than the inlet pressure. Around 1 MPa

Because glazing not only seals the conveying medium but, more importantly, removes the heat generated by the friction pair; the low temperature of the medium within the cold oil pump itself enables it to perform this function

What was said on the 8th floor is correct – using sealant can extend the service life of mechanical seals

In coking and catalysis, seal oil is mentioned; it is also used for pumps. What is the composition of seal oil? I saw this post with the link http://bbs.hcbbs.com/viewthread.php?tid=94413&highlight=%B7%E2%D3%CD; the last edit to this post was made by saaaa on 2009-2-12 at 16:49.]

Typical hot oil pumps are equipped with an oil seal; this oil is drawn from the outlet, cooled, and then injected into the mechanical seal to prevent heat from the hot oil from reaching the mechanical seal. This helps to reduce the temperature at the surface of the mechanical seal, allowing it to operate in a favorable working environment. If a high-temperature resistant mechanical seal could be invented, the sealing oil could be eliminated

Sealing oil is actually the oil used to cool and flush the mechanical seal of the hot oil pump.

Sorry, let me correct that. The seal oil pressure is generally 0.05 MPa higher than the inlet pressure. In the case of multi-stage pumps, the seal oil pressure on the outlet side is slightly higher than that on the inlet side

The sealing oil used for catalytic pump seals is generally diesel; this oil is injected between the sealing surfaces to reduce the temperature at those surfaces； Cool, rinse, lubricate, and seal the end face.

I work with atmospheric-pressure equipment, and the sealing oil used in our hot oil pumps is usually Constant 3 oil (heavy diesel). At the time of plant startup, when the flow rate from Line 3 is insufficient, it is also possible to use oil from Line 1 for supplementary sealing. The main function of the sealing oil is to provide a seal and prevent the leakage of the transported medium. Secondly, there are also effects such as temperature reduction and load reduction

The hot oil pumps we produce don’t have any oil-sealing mechanism; their maximum operating temperature is 350 degrees. They use a double-packed shaft seal, which delivers excellent performance

Sealing oil is relevant to mechanical seals; in the case of double-end face mechanical seals, the inner seal uses a sealing medium, while the outer seal uses sealing oil. In other words, the space between the inner and outer seals is filled with seal oil. You can take a look at the various mechanical seal design standards in ASME!

Also, the hot oil pump pumps seal oil, while the cold oil pump does not. The main function of seal oil is to carry away the heat generated at the seal area. Cold oil pumps do not require seal oil, but there are also hot oil pumps that do not need it. Here, neither the three pumps on the fractionation side nor the bottom pump requires seal oil; there is only flushing oil at the mechanical seals. The bottom pump is fine, but the pumps on the fractionation side operate under high pressure and often leak. We later switched to double-end mechanical seals and added seal oil, and now the situation is much better!

What is the freezing point of your regular grade 3 product? How is freezing prevented in winter?