There are two main designs for liquid ring vacuum pumps. They are tapered ports and flat sides. The smallest pumps are usually flat because they are easier to manufacture. The largest commercially produced vacuum pump is the conical port because it is the most efficient and better able to handle excess water than the flat pump.
Both pump designs operate on the same principle. The multi-cavity rotor is eccentrically placed in the pump body. The seal fluid is introduced and the rotor rotates to produce a liquid ring with approximately constant thickness in the pump body by centrifugal force. Because the rotor is eccentrically placed and has multiple chambers (usually called blades), the liquid almost completely fills the chamber on the discharge side of the pump, and almost completely empties the chamber on the intake side of the pump. Therefore, when the intake valve is opened, the treated gas is sucked in, the forward sealing hydraulic pressure is compressed when the intake and exhaust ports are closed, and the exhaust valve is discharged when the exhaust valve is opened. Finally, when the two ports are closed, the chamber must move from the exhaust port to the intake port.
There is only one moving part, the rotor. The intake valve is formed by a rotor that moves the rotor through the opening from the rotor to the intake port, and the discharge valve moves by the rotor, so that the drum passes through the opening from the rotor to the outlet. The boundary seal is caused by a very tight gap (three human hair) between the material around the rotor and the opening.
In both pumps, the rotor chamber is open on the outer circumference to allow easy access of the sealed fluid.
In a conical port pump, the rotor is sealed at the end and opened internally. In order to form a valve, the two-chamber device is inserted into the rotor, and in order to control the clearance, the device is conical, and the rotor is processed into a matching cone. The clearance is again determined by gaskets, but in conical design, gaskets of seven thousandths of an eight-degree taper change by one thousandth of an inch in the clearance. Therefore, it is easier to control the clearance and has better pump sealing. This design has two advantages. First, the port size is about five times the size of the port in the plane pump. Secondly, the air enters the bucket and leaves the bucket without turning, because it must be in the plane pump.
The CL Sereis Cone Liquid Ring Vacuum Pump models have 12 different types from the CL-700 through the CL-3000. The CL Cone Liquid Ring Vacuum Pump can be found in many application.