CN2436693Y

CN2436693Y - Electric oil submerged screw bolt pump

Info

Publication number: CN2436693Y
Application number: CN 00238622
Authority: CN
Inventors: 崔乃林
Original assignee: 崔乃林
Current assignee: Yulian Industry Co., Ltd., Tangshan
Priority date: 2000-06-23
Filing date: 2000-06-23
Publication date: 2001-06-27
Anticipated expiration: 2010-06-23

Abstract

The utility model relates to an electric oil submerged screw bolt pump, which is sequentially connected with an upper flexible axis, a screw rod, a lower flexible axis, a spline sleeve, a transmission axis, and a protector which are arranged on the lower side of the motion block of the pull tension bearing. A casing is arranged on the external side of the static block of the pull tension bearing; an alignment bearing is arranged between the casing and the upper flexible axis; the upper part of the alignment bearing is provided with a sealing breath block; the external side of the screw rod is provided with the stator liner of the pump; the casing between the upper end of the stator liner of the pump and the upper alignment bearing is provided with the outlet of the pump; the inlet of the pump is on the lower side of the liner; the oil sealing is arranged between the transmission shaft and the casing; a radial bearing is on the lower side of the oil sealing, and an oil submerged electric motor of the electric cables with the driving force is arranged on the lower side of the protector. The electric oil submerged screw bolt pump is used for exploiting the petroleum; the axial force of the screw rod can play the role on the pull tension bearing through the upper flexible axis; the lower flexible axis which can only transmit the torque is free from the axial pull force of the bearing, and accordingly, the service life of the pump group can be prolonged; the initial torque is reduced, and the electric oil submerged screw bolt pump is the high-effective oil exploiting pump of the polymer flooding and the heavy oil exploitation.

Description

A kind of electric oil submerged screw pump

The utility model relates to a kind of specially from the pass the imperial examinations at the provincial level pump of up-flow body of deep-well, relates in particular to a kind of pump of recover petroleum oil well.

Using high-head screw pump, balance of axial force problem for recovering the oil is the major issue in the structural design.For the axial force that the balance oil pumping screw pump is produced, prior art has adopted a kind of design proposal of two screw rod symmetric arrangement, as shown in Figure 1.

As seen from Figure 1, two linings--screw pair (among the figure 8,9 and 20,21) is in the Vertical direction symmetric arrangement, fluid is respectively from suction port 11 up and down, enter lower pump body, after pressure increases, at two linings--mix in the screw pair chamber, again along the lining of upper screw pump and the annular space of pump case, entering

oil pipe

24,7 is pump case, and

eccentric shaft coupling

22,23 allows screw axis to make eccentric rotary.Power cable 16 provides electric energy for oil-submersible motor 18, and protector 17 is provided with for protection oil-submersible motor 18.

But existing electric oil submerged screw pump is owing to the deficiency of following several respects fails to be applied in the field produces at home.Deficiency is:

1, a whole set of unit manufacture cost height for balancing axial thrust, adopts 2 cover pump groups, and this almost doubles the manufacture cost of pump assembly part.The Hand of spiral of top pump bushing and bottom pump bushing is opposite in addition, and therefore, the core rod of making pump bushing also needs two core rods that rotation direction is opposite, and this has further increased manufacture cost again.

2, the initial torque of pump group is big, and cooperating between oil pumping screw pump stator liner and screw rod is interference fit, thereby initial torque is bigger, existing electric oil submerged screw pump adopts the structure of upper and lower two cover pump groups, initial torque is doubled, and this certainly will cause the startup of unit difficulty, and power consumption increases.

3, eccentric shaft coupling work is unreliable, and working life is short, and this is the deadly defect that influences the complete machine operating life.

4, it is big to join the pump difficulty, the screw rod pump head is very responsive to the magnitude of interference between screw rod and lining, therefore be subjected to axial pressure in case the magnitude of interference of upper and lower pump group is joined the inconsistent lower eccentric shaft coupling that just may make, thereby cause fatigue damage, influence the operating time of a whole set of unit in the down-hole.

In view of prior art has above-mentioned shortcoming, limited its applying in field produces, in fact domestic also do not have electric submersible screw pump to be applied on the field produces.

The purpose of this utility model is: design a kind of reliable operation, and long service life, pump group initial torque is little, and the unit cost is low, has changed the electric oil submerged screw pump of screw rod bearing mode.

The utility model is to realize like this; it comprises pump case, pump stator lining, screw rod, oil-submersible motor, and shelves, upper flexible shaft, lower flexible shaft, last alignment bearing, spline housing, oil sealing, radially alignment bearing, transmission shaft are breathed in protector, power cable, seal lubrication type tension bearing, sealing.Wherein, bearing motion block and quiet composition tension bearing; bearing motion block key connects upper flexible shaft; the limit element is equipped with in its upper end, upper flexible shaft and screw rod screwed connection, and the screw rod screw thread connects lower flexible shaft; itself and spline housing spline connect; this cover spline connects transmission shaft, and this spline connects the output shaft of protector, and there is housing quiet outside of tension bearing; between this housing and upper flexible shaft alignment bearing is housed; its top has sealing to breathe shelves, and screw rod is equipped with the pump stator lining outward, on the housing between its set upper side and alignment bearing pump discharge is arranged; pump intake is in the stator liner lower end; oil sealing is between transmission shaft and housing, and radially alignment bearing is contained under the oil sealing, and the oil-submersible motor that has power cable is in the protector lower end.

The good effect that the utility model compared with prior art has is: at first cancel top pump group on structural design, and upper and lower gentle axle is housed at the screw rod two ends of bottom pump group, airtight lubricated type tension bearing is equipped with on the top of upper flexible shaft, the axial force of screw rod acts on the tension bearing by upper flexible shaft like this, make not bearing axial pushing force of a lower flexible shaft transmitting torque, thereby avoided the tired consumptive disease of lower flexible shaft to damage, prolonged its operating life.

Because the utility model has been cancelled top pump group on structural design, make the manufacture cost of pump assembly reduce by one times, reduced the initial torque of pump group simultaneously exponentially, also so significantly reduced the starting power of motor.On structural design, changed the bearing mode of screw axial power again, thereby eliminated a unfavorable factor that influences the electric submersible screw pump operating life by employing upper flexible shaft and airtight lubricated type tension bearing.The utility model improves 1.2 times of overall efficiencies if be used for the oil recovery well or the thick oil well of the polymer injection displacement of reservoir oil than other oil production methods such as electric submersible centrifugal pumps.

Below in conjunction with accompanying drawing the utility model embodiment is described in detail:

Fig. 1 is existing electric oil submerged screw pump internal structure cross-sectional schematic;

Fig. 2 is a structure cross-sectional schematic of the present utility model:

As shown in Figure 2, bearing sound piece 1 and the quiet 2 common tension bearing of forming, the downward axial force of carrying screw rod, motion block 1 is that key is connected with the upper end of upper flexible shaft 3, and with limit element 19 (nut or woodruff key) axle 3 is carried out axial limiting in the upper end of upper flexible shaft 3.Upper flexible shaft has two functions, that is: the axial tension with screw rod passes to tension bearing, allow screw rod to do eccentric rotary simultaneously, upper flexible shaft 3 is used screwed connection with screw rod (claiming rotor again) 9, screw rod 9 is used screwed connection with lower flexible shaft 10, lower flexible shaft 10 and spline housing 12 are for spline is connected, and the position of axle 10 in spline housing is free state in the axial direction.Spline housing 12 is that spline is connected with transmission shaft 13, and transmission shaft 13 is connected with the output shaft spline of protector 17.There is housing 7 the tension bearing outside, between housing 7 and gentle axle 3 alignment bearing 5 is housed, and has sealing to breathe shelves 4 on it, and it separates lubricant oil in the tension bearing chamber and well liquid, can move up and down when lubricant oil expands and shrink.Stator liner 8 and screw rod 9 are for movingly, on the housing 7 between stator liner 8 upper ends and the last alignment bearing 5, be provided with pump discharge 6, the housing 7 of stator liner 8 lower ends is provided with pump intake 11, and oil sealing 14 is between transmission shaft 13 and housing 7, and radially alignment bearing 15 is below oil sealing 14.Power cable 16, the function of protector 17 and oil-submersible motor 18 and annexation and prior art are together.

Claims

A kind of electric oil submerged screw pump; it comprises pump case; the pump stator lining; screw rod; oil-submersible motor; protector; power cable is characterized in that: it also comprises airtight lubricated type tension bearing; shelves are breathed in sealing; last lower flexible shaft; last alignment bearing; spline housing; oil sealing; alignment bearing radially; transmission shaft; wherein: tension bearing is formed in bearing motion block (1) and quiet (2); bearing motion block (1) key connects upper flexible shaft (3); limit element (19) is equipped with in the upper flexible shaft upper end; upper flexible shaft (3) and screw rod (9) screwed connection; screw rod (9) screwed connection lower flexible shaft (10); lower flexible shaft (10) is connected with spline housing (12) spline; spline housing (12) spline connects transmission shaft (13); this spline connects the output shaft of protector (17); there is housing (7) quiet (2) outside of tension bearing; between this housing (7) and upper flexible shaft (3), alignment bearing (5) is housed; its top has sealing to breathe shelves (4); pump stator lining (8) is arranged outside the screw rod (9); stator liner (8) upper end and on set upright on the housing (7) between spool (5) and be provided with pump discharge (6); pump intake (11) is in stator liner (8) lower end; oil sealing (14) is between transmission shaft (13) and housing (7); radially alignment bearing (15) is contained under the oil sealing (14), and the oil-submersible motor (18) that has power cable (16) is in protector (17) lower end.