CN2192982Y

CN2192982Y - Electrical controlled device for driving beam-pumping unit with shunt motor bank

Info

Publication number: CN2192982Y
Application number: CN 92243212
Authority: CN
Inventors: 石秀令
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-11-25
Filing date: 1992-11-25
Publication date: 1995-03-22
Anticipated expiration: 2002-11-25

Abstract

The utility model relates to an electrical controlled device for driving oil pumping unit with shunt motor bank which is used for the oilfield. The utility model solves the problem of the low power factor of the motor of the oil pumping unit of the present oil field. The utility model is characterized in that two motors are coaxial with a speed relay, and the normally-closed contacts of the speed relay SDJ are used for forming a control circuit. When the oil pumping unit starts, the two motors are driven at the same time, and the normally closed contacts of the speed relay are switched off after the rated revolution is achieved; so one motor stops doing power supply, and the other motor works. The utility model has the advantages that the power factor is improved, the power saving is realized, and the utilization ratio of the generating equipment is improved.

Description

Electrical controlled device for driving beam-pumping unit with shunt motor bank

The utility model relates to the oil-field oil pumper drive motor and changes two into by one, makes the motor that drives oil pumper be in optimum Working, improves the electric control gear of power factor.

The oil pumper of oil field use at present all is by separate unit 6 utmost points or 8 utmost point Asynchronous Motor Driving, because of bringing onto load starts, power of electric motor is all bigger, so normal operating load only is the 40-50% of nominal load, therefore power factor is very low, and general power factor is about 0,45.For a long time, people managing to improve power factor as a very important subject study, so far do not have breakthrough progress always yet.Think after the whole bag of tricks that the present known raising power factor of analysis is adopted and the measure, the way of thinking that studies a question has limitation, mostly under the present operating state of oil pumper, adopt capacitance compensation, raising revolutional slip, raising starting torque to wait and improve power factor, its result is undesirable.

Task of the present utility model is to make the oil pumper drive motor be in optimum Working, reaches desirable power factor, and purpose is economize on electricity, gives full play to the generating equipment ability, can improve generating equipment utilance 50-70%.

The utility model is achieved in that the oil pumper driving changes two motors into by original separate unit motor, two motors power sum equals or is similar to the separate unit power of electric motor, the power that drives oil pumper during startup is constant, the motor of two same number of revolutions drives oil pumper simultaneously during the oil pumper starting, after oil pumper reaches rated revolution, wherein a motor quits work, by another motor driven oil pumper work, make the motor load of work reach 80% to nominal load, power factor can be near the motor base load rating, 0,75-0, between 87, reach the purpose that improves power factor.

Technical solution of the present utility model:

Motor D1, D2 and speed relay SDJ are coaxial.A normally opened contact b that the g of the normally-closed contact of speed relay SDJ (g, h) end and the time-delay of normally opened contact c, the electric motor protecting YDB of the moment timing closing of time-delay relay SST disconnect and the end of starting button QA link to each other, and other end h is connected in the control loop by change over switch HK and ac contactor coil C1 or C2.This technical scheme drives oil pumper simultaneously in the time of can realizing motor D1 and D2 starting, when reaching rated revolution after the oil pumper starting, the normally-closed contact of speed relay SDJ (g, h) disconnects, make motor D1 or D2 outage, surplus motor driven oil pumper work, reach the raising power factor, economize on electricity, give full play to the generating equipment ability, improve the function of the utilance of generating equipment.

Below with reference to accompanying drawing the utility model is described in further detail.

Fig. 1 is circuit theory diagrams of the present utility model

Fig. 2 is an electric control gear front view of the present utility model

Fig. 3 (1) and Fig. 3 (2) are motor of the present utility model and speed relay scheme of installation

ZK air switch, 1-2RD fuse, C1 and C2 A.C. contactor, TA stop button, QA starting button, K1 and K2 switch, HK change over switch, YDB motor protecter, SST time-delay relay, D1 and D2 motor, SDJ speed relay in Fig. 1.

In Fig. 2, (9) casing, (10) card.

In Fig. 3 (1), (1) speed relay SDJ, (2) motor D1.

In Fig. 3 (2), (3) skin is for wheel, (4) key, (5) gear coupling overcoat, (6) gear coupling sleeve.(7) motor D2, (8) base.

In conjunction with Fig. 1 its course of work is described:

1, manually boots; K switch 1 disconnection this moment; K2 disconnects; the HK change over switch is in 1 closure; press start button QA; contactor C1 and C2 energising, contactor normally opened contact closure, motor protecter YDB gets electric time-delay break contact (a, the b) closure that makes; contactor C1 and C2 self-locking; motor of oil extractor is in starting state, when electrical motors to rated revolution, the normally-closed contact of SDJ speed relay (g, h) disconnects; contactor C1 outage; normally opened contact disconnects, and motor D1 outage quits work, and motor D2 drives oil pumping work.

2, automatically start, this moment K switch 1 closure, K2 disconnects; change over switch HK is in 1 when closed; because of oil-field oil pumper relatively disperses, therefore every oil pumper of deactivation needs to start automatically in batches respectively; and can escape starting current; and with reaching overload, the open phase protection of motor, two motors is worked simultaneously during startup, reach rated revolution after; a motor quits work, and has only a motor job.When after having a power failure, sending electricity again; often the opening of moving timing closing of time-delay relay SST wink touched (c, d) closed (between time-delay 7-120 second) and made contactor C1 and C2 energising; the normally opened contact closure of contactor C1 and C2; oil pumper enters starting state; motor protecter YDB is in running order; normally opened contact (a, the b) closure that the time-delay of protector disconnects; after the contactor self-locking; the normally opened contact (c, d) of moving timing closing of the wink of time-delay relay disconnects; prepare for starting automatically next time, repeat said process when sending electricity again after the power failure again.The normally opened contact of SDJ speed relay after reaching rated revolution (g, h) disconnects, contactor C1 outage, and normally opened contact disconnects, and motor D1 outage quits work, and motor D2 drives oil pumper work.

When 3, change over switch HK is in position 1 closure, starts back motor D2 and drive oil pumper work, when being in position 2 closures, startup back motor D1 drives oil pumper work.Motor D1 and D2 should take turns and change jobs.

Claims

1, a kind of by A.C. contactor C1 and C2, air switch ZK, motor protecter YDB; the motor unit in parallel that time-delay relay SST, fuse 1RD, 2RD, stop botton TA, starting button QA, K switch 1, K2, change over switch HK, speed relay SDJ form drives the oil pumper electric control gear, and its feature is as follows:

Speed relay SDJ is coaxial with motor D1, D2.The normally-closed contact of speed relay SDJ (g, h); wherein the normally opened contact c of g end and the moving timing closing of wink of time-delay relay SST, and the normally opened contact b that disconnects of the time-delay of motor protecter YDB and the end of starting button QA link to each other, and other end h passes through change over switch HK and is connected with ac contactor coil C1 (or C2).

2, parallel-connected induction motors group as claimed in claim 1 drives the oil pumper electric control gear, its feature: a starting button QA connects between the g end of the normally-closed contact (g, h) of speed relay SDJ and stop botton TA.