If the outlet of the reciprocating compressor is not opened...
Thread Content
This post was last edited by Young Builder on 2015-8-6 22:39. Idea: Suppose the outlet of the reciprocating compressor is not used; moreover, if the cylinders, the outlet buffer tank, and the outlet pipelines have infinite strength, then there will be no problems at all； Also, the piston rod, air valves, power, etc., are not an issue. I guess the following situation might occur: 1. The pressure keeps rising, reaching a certain level – I don’t know how many times the rated pressure this is – and as the pressure inside the cylinder continues to increase, eventually, at the end of a compression cycle, the exhaust valve fails to open due to the extremely high back pressure. It can also be understood as follows: the exhaust valve is open, but backpressure may even push in the opposite direction, making it impossible for the gas to be forced out at all. 2. Because the pressure inside the cylinder is extremely high, the intake valve remains closed, preventing any further gas from being drawn in through the inlet. 3. The above two points can be simply summarized as follows: although the piston continues to move back and forth, there is only a slight fluctuation in the pressure inside the cylinder, with no intake or exhaust of air. In other words, the pressure will not rise indefinitely. After thinking for a while, I wonder if this exhaust pressure will increase only slightly, not much more than the rated pressure. As for how much it can increase, I invite everyone to discuss it. Just wild guesses – feel free to discuss.
Stop making such assumptions; the strength of steel pipes cannot be infinite, and safety valves have also been removed.
At a certain point, when the piston compresses the air, the pressure in the outlet pipe becomes equal to the pressure inside the cylinder, and the outlet valve no longer opens. During inhalation, the pressure inside the cylinder is higher than that in the inlet pipe, so the inlet valve no longer opens. Although the piston moves back and forth, within the cylinder the gas is continuously being compressed and expanded. For this to happen, high requirements are placed on the strength of the cylinder block, piston, and moving parts, as well as on the power of the prime mover. But this only exists in theory.
Before the exhaust valve can be opened, the motor will shut down, and the exhaust temperature is also too high for vulnerable components such as the valve plates to withstand
As the export pressure increases, more air will leak around the piston, until an equilibrium is reached – that is, the pressure on the low-pressure side becomes equal to the inlet pressure, and the pressure on the export side ensures that the amount of air that leaks during compression is replenished on the inlet side.
The original poster is really talented; it’s a fascinating topic. The pressure inside the cylinder keeps increasing, and once it reaches a certain level, it becomes almost impossible to draw in more fluid. This situation places extremely high demands on the material of the equipment itself. I personally think that, under normal circumstances, it’s either a leak in the end cover or in the packing; it’s also possible for the unit to disassemble or explode (hehe).
Isn’t this more interesting than the assumption of ideal gas compression?