Quick start vertical multistage centrifugal oil pump with spool and bonnet seal

Abstract

The invention relates to a fluid machine, in particular to a quick start vertical multistage centrifugal oil pump with sealed valve element and valve cover. A pump base is connected above an oil tank; a pump body and a connecting frame extend into the oil tank; the pump body is formed by connecting a front section, a middle section and a back section from bottom to top; an oil inlet is formed in the bottom end of the front section; main shafts are respectively mounted on the connecting frame and the front section through an upper bearing and a lower bearing; a valve base is connected between the back section and the connecting frame; the valve element is tightly bonded on the plane of the valve base for sealing; the tail ends of the main shafts are connected with a balance drum; a gap throttle seal is arranged between the balance drum and the pump base; the pump base at the lower end of the balance drum is connected with an oil outlet pipeline; and the upper ends of the main shafts are connected with a motor through couplings. Valve element and valve base mechanisms are arranged in the back section above a final impeller of the quick start vertical multistage centrifugal oil pump; and the valve element and the valve base isolate air of the connecting frame on the upper side for quick starting. The oil pump is wholly mounted in the oil tank; the pump body and the impeller are dip in oil; lubricating oil has no need to be added; a shaft seal and a bottom valve are not needed; the structure is simple and compact; and the service life is long.

Description

technical field [0001] The invention relates to the field of fluid machinery, in particular to a vertical oil pump capable of quick start for conveying lubricating oil. Background technique [0002] When large-scale mechanical equipment such as steam turbines, oxygen generators, compressors, multi-stage axial flow fans, and auxiliary machinery are in operation, lubricating oil and hydraulic oil must be supplied from centralized oil stations. Most of the existing oil supply pumps use horizontal centrifugal pumps, and the horizontal centrifugal pumps often have problems such as shaft seal oil leakage and large floor space. [0003] According to the requirements of the process flow, the oil pump must be equipped in a way of one use and one standby. When the main oil pump is working, the backup pump is not turned on. When the main oil pump fails, the backup pump is turned on to maintain the normal flow of lubricating oil. In addition, in order to be suitable for the working con...

AI Technical Summary

Problems solved by technology

The vertical oil pump structure has the problem that the backup pump is difficult to open. The reason is that there is a large section of air between the oil level in the backup pump and the check valve, and there is a certain oil pressure in the oil supply pipeline. When the backup pump is started, the check valve opens repeatedly. Closed, the air is compressed and expanded for many times, and the oil pump can run normally after the air is exhausted. It takes 5-10 minutes for the traditional vertical oil pump to achieve the required oil pressure and flow supply, which will cause disastrous consequences to the operating mechanical equipment.

Images