48 results about "Lobe pump" patented technology

Rotary lobe pump and circumferential piston pump designs are disclosed where the drive and driven shafts are detachably connected to their respective rotors. The rotors are disposed in a pump or rotor casing, which is sandwiched between a head cover and a gearbox. The drive and driven shafts pass through mechanical seal assemblies, which are sandwiched between the first and second rotors and the gear box respectively. The seal assemblies can be serviced or replaced by simply removing the head cover and removing the rotors from the drive and driven shafts. The pump casing does not need to be removed to replace or service the seal assemblies. Further, the capacities of the disclosed rotary lobe and circumferential piston pumps can be modified without changing the gearboxes or shaft length. To modify a pump capacity, all that needs to be changed are the rotors, the pump or rotor casing and, in some designs, the head cover or cover plate. In some designs, the cover plate is universal to the gearbox so that only the rotors and pump casing need to be changed to modify the pump capacity.

A rotary lobe pump comprises a pump body having a driving means and an outer casing, and an insert that can be replaced. The insert comprises: a housing formed of a plastics material and having an inlet port, an outlet port and internal surfaces defining a pumping chamber; and a pair of lobed rotors arranged for rotation within the pumping chamber. The housing includes apertures through which the lobed rotors may be rotationally driven, so that the lobed rotors mesh together for pumping a fluid from the inlet port to the outlet port.

The invention relates to a vacuum-pumping system for a wind tunnel body. The vacuum-pumping system includes a multi-level air cooled lobe pump assembly, a set of heat exchangers, a silencer, an overflow valve, and a check valve; the upper part of each air cooled lobe pump is provided with an air inlet, and the lower part of each air cooled lobe pump is provided with an air outlet; two sides of each air cooled lobe pump are provided with a cool air returning opening respectively, so that heat balance of a pump body can be maintained when the pump operates under a high pressure difference; when the pressure of an air inlet connected to the back end of the lobe pump system is greater than the discharge pressure of the lobe pump assembly, a part of pumped air can be directly discharged into the silencer via the overflow valve, and then is discharged into the atmosphere via the silencer; the other part of the pumped air is discharged into the atmosphere via the overflow valve and the silencer. Each vacuum heat exchanger of the system mainly includes a housing, heat exchanger tubes, and an anti-reflux valve. A PLC control technology and a frequency converter technology are adopted by the system, so that the vacuum-pumping system can automatically adjust the pumping speed according to the pressure of an entrance.

Lobe pumps have rings which can be located at least partially in at least one of cover plates and rotors, if not both to provide at least thrust bearings to space the rotors from the cover plates. Some rotors may have voids in ears to make the rotor lighter in weight with the voids potentially capped, symmetrically disposed, arcuately shaped and / or have other desirable features. Some rotors may have ears extending beyond cutouts which may extend beyond hubs, if not beyond hub extensions as well which may receive cover spigots thereabout. Some rings may act as radial bearings as well when located in the cover spigots.

Lobe pumps have rings which can be located at least partially in at least one of cover plates and rotors, if not both to provide at least thrust bearings to space the rotors from the cover plates. Some rotors may have voids in ears to make the rotor lighter in weight with the voids potentially capped, symmetrically disposed, arcuately shaped and / or have other desirable features. Some rotors may have ears extending beyond cutouts which may extend beyond hubs, if not beyond hub extensions as well which may receive cover spigots thereabout. Some rings may act as radial bearings as well when located in the cover spigots.

The invention provides a variable displacement rotor pump, which includes a pump body, an outer rotor, an inner rotor, and a drive shaft. The pump body is provided with a shaft hole and a cavity, and the bottom wall of the cavity is provided with an oil inlet cavity and oil outlet cavity, the cavity of the pump body is equipped with an inner casing and a variable spring, the inner casing is composed of a ring-shaped wall plate and a bottom plate, and the bottom plate is provided with an eccentric circular hole and two two arc-shaped through holes, the positions of the two arc-shaped through holes correspond to the oil inlet chamber and the oil outlet chamber respectively; the hollow part in the middle of the inner housing is the rotor chamber, and the outer rotor and inner rotor are installed in the rotor chamber Inside; the wall plate of the inner casing is provided with an outwardly protruding spring pressing block, one side of the spring pressing block is in contact with the variable spring, and the other side is in contact with the cavity side wall of the pump body A variable control cavity is formed between them; at least two sets of movement limit mechanisms are arranged between the inner casing and the pump body, and the movement limit mechanism can control the rotation range of the inner casing in the cavity of the pump body. Limit.