Centrifugal pump seal oil

Circulation using the principle of thermal siphonage~

Can the pressure generated by the principle of thermal siphonage achieve sealing?

The circulation of the sealing oil in high-speed pumps is achieved through thermal siphon circulation, while in other pumps it is generally accomplished via pumping circulation

I hope an expert can explain it more clearly; I really want to learn it too

Hehe, I just read some books and now I basically understand it. In simple terms, it’s a self-circulating process caused by temperature differences. Below is an explanation of thermal siphonning; once you read it, you’ll understand…… The siphoning phenomenon is caused by the attractive forces between liquid molecules and potential energy differences. That is, by using the pressure difference in the water column, the water rises and then flows back to lower areas. Since the water surface at the pipe openings is subjected to different atmospheric pressures, water flows from the side with higher pressure to the side with lower pressure, until the atmospheric pressures on both sides are equal. At that point, the water levels inside the container become equal, and the flow of water stops. The water in the container can be quickly drawn out using the siphon effect. 　　The siphon is an ancient invention of humanity; as early as the 1st century BC, people created a peculiar type of siphon. 　　In fact, siphoning is not entirely caused by atmospheric pressure; siphonage can also occur in a vacuum. The force that causes a liquid to rise is the cohesive force between molecules in the liquid. When siphoning occurs, since more liquid flows out of the pipe than flows into it, the gravitational forces on both sides are unbalanced, causing the liquid to continue flowing in one direction. As the liquid flows into the tube, the pressure decreases as one moves higher up. If the tube through which the liquid rises is very tall, the pressure will drop to the point where bubbles form inside the tube (composed of air or other gaseous substances), and the operating height of the siphon is determined by the formation of these bubbles. Bubbles break the continuity of the liquid, reducing the force between the gas molecules at either end of the bubble to zero, thereby disrupting the siphon effect; therefore, the tube must be filled with water. At normal atmospheric pressure, the siphon functions better than in a vacuum, as the atmospheric pressure acting on both ends of the tube increases the pressure inside the entire siphon. Application example: Insert one end of the water-filled hose into the water, with the other end hanging outside the container holding the water; moreover, the outlet should be below the water surface. In this way, the water will flow out of the container through the rubber hose. Additionally, since there is air inside the pipe, some air needs to be drawn in when drawing water in