I earnestly seek advice from experts in vacuum pumps!
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This post was last edited by B0SS on 2018-10-11 at 19:06. I currently have a 2SK-1.5 water ring vacuum pump equipped with an atmospheric ejector. When the ejector is used normally, the vacuum level does not reach -0.09 MPa; however, when the air inlet of the ejector is blocked by hand, the vacuum level increases, reaching -0.094 MPa. I don’t understand why blocking the ejector results in a higher vacuum level, as if the ejector isn’t being used Also, the test video sent to me by the manufacturer shows that the vacuum level with the injector in use can reach -0.099 MPa. Now the manufacturer says there’s nothing wrong with the pump; it’s a problem with our system, but I can’t find any issues with our system either! Please help! Under normal use, the injector pressure gauge reads below -0.09; when the injector is clogged, the gauge reads -0.094
It’s not clear what this injector is used for
The atmospheric ejector has a larger accompanying unit! Or rather, the water ring pump is undersized!
The area covered by your hand should be connected to compressed air; take a close look at the manufacturer’s test video.
This post was last edited by symc on 2018-10-13 at 11:22. First, the usage method is incorrect； Second, the pumping volume is too low; if you want to achieve a certain level of performance, the pumping volume of the water ring vacuum pump needs to be increased by 3 times. Only then will the pumping rate at the location where the vacuum gauge is installed equal the flow rate that occurs after blocking the atmospheric inlet of the atmospheric ejector. Atmospheric ejectors operate at pressures of 1–4 kPa.a. Since water ring vacuum pumps are affected by the vapor pressure of water, their pressure can only reach -0.096 (4 kPa.a); an atmospheric ejector can be used to further reduce this pressure (and thus increase the level of vacuum). With the use of an atmospheric ejector, the maximum inlet pressure can be reduced to as low as 1 kPa.a. However, there is a significant drawback: the pumping speed drops to 30% of the tested pumping capacity ； However, if you just want to improve a little bit, such a high traffic ratio isn’t necessary, but at least 2 times is required!
The test video and images provided by the manufacturer show that the pressure can reach 0.99
The problem with improving the vacuum level is that when it gets blocked and isn’t in use, the vacuum level actually becomes higher than when it’s in use
There are images below; the manufacturer’s test video shows a value of 0.99
Thank you; it’s clear this is professional work. Based on your explanation, I think the problem lies in the fact that my container is too large while the pump is too small. The manufacturer’s tests were conducted using a very small container, whereas mine is much larger. Another issue is determining what size of pump I should choose – how should I decide between the size of the container and the pumping speed? gratitude
The injector has three ports: one for the intake air, one for the exhaust gas, and one for compressed air. Where you have a vacuum gauge, it should be connected to the suction port ； Water ring pump connected to the exhaust outlet ； Where is the compressed air connected? That port is not connected to compressed air; it is in communication with the atmosphere, so of course the vacuum level cannot be increased. Once it is blocked, this system becomes sealed, and the vacuum level can increase.