RU54110U1 - SUBMERSIBLE OIL-FILLED ENGINE WITH AXIAL SUPPORT UNLOADING SYSTEM - Google Patents

Abstract

This utility model relates to petroleum engineering, namely to submersible oil-filled engines of a borehole centrifugal pump. A discharge screw or labyrinth-screw discharge pump is located on the motor shaft. A heel is fixed on the end of the shaft. The shaft is made with a through axial channel providing a flow of lubricant into the contact zone of the heel with the thrust bearing. The thrust bearing also has a through channel for oil flow. The electric motor contains an oil-filled heat exchanger located below the heel of the heel. 1 c-p formula. 2 ill.

Description

The inventive utility model relates to petroleum engineering, and in particular to submersible high-speed engines for centrifugal borehole pumps.

The closest analogue of the invention is a submersible oil-filled motor of a borehole centrifugal pump (patent RU 2219372, 2003) containing a housing in which a current lead assembly, a stator with a winding, the terminals of which are connected to a current lead assembly, a shaft, a heel fixed to the shaft, and a thrust bearing are placed. The specified system does not provide effective unloading of the axial support for high-speed submersible engines, since it can cause high friction in the contact zone of the working surfaces of the heel and the thrust bearing. Under such conditions, the axial support is rapidly destroyed.

The increase in the resource of the axial support in a high-speed engine can be achieved by reducing the specific contact pressure in the heel and thrust using a support unloading system. Such a system should be compact, technologically advanced and provide significant unloading forces for a high-speed pump.

To achieve the specified technical in a submersible oil-filled engine of a borehole centrifugal pump containing a housing in which the current lead assembly is located, a stator with a winding, the terminals of which are connected to the current lead assembly, a shaft, a heel fixed to the shaft and a thrust bearing, have a discharge screw or labyrinth on the shaft a screw discharge pump, and the heel is fixed on the shaft end, and the shaft is made with a through axial channel providing a flow of lubricant into the contact zone of the heel with the thrust bearing, and the heel and heel nick have a through channel for oil flow, and the engine may contain an oil-filled heat exchanger located below the heel of the heel, while the above through channel of the thrust provides oil flow from the oil-filled heat exchanger.

Figure 1. shows a general view of a submersible oil-filled electric motor. Figure 2 shows a shaft unloading system using a screw pump.

An oil-immersed submersible motor of a borehole centrifugal pump comprising a housing 1, in which a current lead assembly 2, a stator with a winding are placed (not shown in the figure). On the lower end of the shaft 3 there is a heel 11. On the shaft surface (the outer lateral (non-working) surface of the heel) a discharge screw pump 9 is made. A cross-section is represented in cross section of the grooves of the screw pump 10. A response channel 8 is made on the housing element 12 covering the shaft surface 8 labyrinth screw pump. The through channels of the shaft and the thrust bearing (respectively 7 and 5) are intended, in particular, to ensure oil flow into the contact zone of the heel with the thrust bearing 4 from the oil-filled heat exchanger of the engine 6.

The specified device operates as follows. When the shaft rotates at high speeds, the discharge screw or labyrinth-screw discharge pump creates a discharge force, which can significantly reduce the pressure in the heel contact area. In this case, a sufficient thickness of the layer of liquid lubricant is ensured (between the working surfaces of the heel and the thrust bearing) for the regime of liquid contact friction. The flow of oil into the working area of the contact is ensured by the oil flow from the through channels of the shaft and the thrust bearing. Cutting the discharge screw pump on the shaft surface allows you to create a compact discharge system for the axial support of the motor shaft. The lifting force of such a pump can be increased by cutting on the housing channel 12 of the grooves 8 in such a way that a labyrinth-screw discharge system is formed. The axial support of such an engine may be located at the end of the shaft (heel), below which there is a thrust bearing. A significant discharge effect from the specified pump is observed in high-speed systems (at a speed of more than 3,000 thousand per minute).

Claims (2)

1. Submersible oil-filled engine of a borehole centrifugal pump, comprising a housing in which a current lead assembly, a stator with a winding, the terminals of which are connected to a current lead assembly, a shaft, a heel mounted on a shaft, a thrust bearing, characterized in that a discharge screw or labyrinth is located on the shaft a screw discharge pump, the heel being fixed at the end of the shaft, and the shaft made with a through axial channel providing a flow of lubricant into the contact zone of the heel with the thrust bearing, the thrust bearing and the heel having a through channel l for oil flow through the axial passage in the shaft. 2. The submersible oil-filled engine of the borehole centrifugal pump according to claim 1, characterized in that the engine comprises an oil-filled heat exchanger located below the heel of the heel, and the aforementioned through channel of the heel provides oil flow from the oil-filled heat exchanger.