CN201714353U

CN201714353U - Electromagnetic soft brake for oil pumping units

Info

Publication number: CN201714353U
Application number: CN2010202591198U
Authority: CN
Inventors: 杨承红; 孙茂涛; 夏大洪; 李介祥; 陈世生
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-07-10
Filing date: 2010-07-10
Publication date: 2011-01-19
Anticipated expiration: 2020-07-10

Abstract

The utility model relates to a brake mechanism for oil pumping units, in particular to an electromagnetic soft brake for oil pumping units capable of maintaining an oil pumping unit at a balanced position when the oil pumping unit stops working. Technically, the brake of the utility model comprises an oil pumping motor (5), an alternating current power supply, and a braking circuit arranged between the oil pumping motor (5) and the alternating current power supply; the braking circuit further includes a current-limiting capacitor (1), a rectifier bridge (2) and a direct current switch (3). The oil pumping motor (5) is provided with a main control switch and the braking circuit is in parallel connection with the main control switch arranged on the oil pumping motor; the rectifier bridge (2) is, however, in series connection with the direct current power supply and the current-limiting capacitor (1). With such a brake mechanism, an oil pumping unit can stop working in a soft way, thereby preventing the oil pumping rod from suddenly and fast falling off when the oil pumping unit stops working, and further, increasing the safety of the oil pumping equipment as well as of the workers. Capable of maintaining an oil pumping unit at a balanced position when the oil pumping unit stops working, the brake mechanism of the utility model makes the starting reliability of the oil pumping motor more reliable.

Description

Oil pumper electromagnetism callipers brake car

One, technical field: the utility model relates to a kind of oil pumper arrestment mechanism, especially a kind of oil pumper electromagnetism callipers brake car.

Two, background technology oil pumper arrestment mechanism.This class arrestment mechanism is mainly used in the plunger displacement pump sucker rod pumping machine system, and the oil pumper that this class arrestment mechanism is installed mainly contains: belt-type oil pumper, chain type oil pump and beam pumping unit.For the weight of balance sucker rod, reduce the fluctuation range of pumping motor load in a stroke, this class oil pumper has all been taked the counterweigh measure.Because the liquid level of oil well is unsettled, the situation that oil pumper is owed counterweight or mistake counterweight always exists.During oil pumper work, the restriction that the rotating speed of pumping motor is subjected to supply frequency is stable, but close down back pumping motor and AC power disengagement at oil pumper, under the effect of uneven torque, may make motor in short-term, surpass the rated speed rotation, cause hurtling down of sucker rod.Hurtling down of this sucker rod caused hidden danger to staff and oil production equipment by the oil pumper, so all increased the shutdown of pumping machine arrestment mechanism on many oil pumpers.At oil-field oil pumper is the most general oil production equipment.In order to prevent oil pumper the hurtling down of sucker rod when shutting down, many oil pumpers have installed the shutdown arrestment mechanism additional.At present, the shutdown of pumping machine arrestment mechanism all is to adopt the mechanical brake principle, as: brake rim, brake block etc.Mechanical brake complex structure, cost height, control logic complexity, easily machinery to take place malfunctioning.Mechanical brake oil pumper after brake stops mostly fast, belongs to hard brake.Hard brake makes oil pumper stop at undefined position, may occur the situation of pumping motor reversing after getting off the brakes, and the starting duty that has increased motor is unfavorable for the starting of motor.

Three, summary of the invention: the purpose of this utility model is to provide a kind of can finally stop at the equilbrium position after making shutdown of pumping machine, avoid the mechanical malfunctioning of arrestment mechanism, simplifies the oil pumper electromagnetism callipers brake car that oil pumper braking control is patrolled.Its technical scheme is: oil pumper electromagnetism callipers brake car comprises pumping motor, AC power, between pumping motor, AC power, be provided with braking circuit, braking circuit is made up of limiting capacitor, rectifier bridge, dc switch, pumping motor is provided with main switching control, braking circuit is in parallel with the main switching control of pumping motor, and rectifier bridge is connected with AC power, limiting capacitor.After the pumping motor main switching control disconnects, to motor stator winding feeding DC current in short-term, make the slow ramp to stop of pumping motor by braking circuit, final oil pumper stops at the equilbrium position.After pumping motor and three-phase alternating-current supply disengagement, in any two-phase of threephase motor, feed a certain amount of DC current, in iron core of electric motor, produce a stationary magnetic field, hinder the continuation rotation of motor rotor, play the motor brake effect.DC current obtains AC rectification by rectification module, and the capacitor of contacting between rectification module and the AC power plays the effect that limits stalling current.After adopting technique scheme, realize the soft stop of oil pumper, avoided hurtling down of sucker rod behind the shutdown of pumping machine, improved oil production equipment and field personnel's safety.Can make oil pumper stop at the equilbrium position, improve the reliability of pumping motor starting.The utility model need not oil pumper is done any change, and braking does not have mechanical malfunctioning, and control logic is simple, and project installation is easy.

Four, description of drawings

Fig. 1 is the circuit structure diagram of a kind of embodiment of the utility model;

Fig. 2 is the circuit theory diagrams that detect control circuit among Fig. 1.

Five, the specific embodiment: oil pumper electromagnetism callipers brake car comprises pumping motor 5, AC power 13, between pumping motor 5, AC power 13, be provided with braking circuit, braking circuit is made up of limiting capacitor 1, rectifier bridge 2, dc switch 3, pumping motor 5 is provided with main switching control, braking circuit is in parallel with the main switching control of pumping motor 5, and rectifier bridge 2 is connected with AC power 13, limiting capacitor 1.After the pumping motor main switching control disconnects, to motor stator winding feeding DC current in short-term, make the slow ramp to stop of pumping motor by braking circuit, final oil pumper stops at the equilbrium position.After pumping motor and three-phase alternating-current supply disengagement, in any two-phase of threephase motor, feed a certain amount of DC current, in iron core of electric motor, produce a stationary magnetic field, hinder the continuation rotation of motor rotor, play the motor brake effect.DC current obtains AC rectification by rectification module, and the capacitor of contacting between rectification module and the AC power plays the effect that limits stalling current.

Among Fig. 2 be a kind of charged magnetic callipers brake car the oil pumper manual starting, stop the control principle circuit diagram.Press switch knob 6, alternating-current switch sucking coil 7 powers up, and alternating-current switch 4 closes a floodgate pumping motor 5 starting operations.The alternating-current switch auxiliary contact 12 closed alternating-current switch that keep are connected simultaneously, auxiliary normal opened contact closed turn-on time of the relay coil 11 of another alternating-current switch, time relay time-delay contact 10 closures.Press trip button 8, alternating-current switch sucking coil 7 dead electricity, alternating-current switch 4 disconnects the pumping motor dead electricity.The auxiliary normal opened contact of alternating-current switch disconnects simultaneously, and time relay time-delay is returned, and auxiliary normally closed contact is connected, and dc switch sucking coil 9 powers up, dc switch 3 closures, and pumping motor inserts the DC injection braking electric current, and the oil pumper ramp to stop is to the equilbrium position.Final time relay delay time arrives, and time-delay contact 10 is opened, dc switch sucking coil 9 dead electricity, pumping motor outage, system's involution.

Claims

1. oil pumper electromagnetism callipers brake car, comprise pumping motor (5), AC power (13), it is characterized in that: be provided with braking circuit between (13) in pumping motor (5), AC power, braking circuit is made up of limiting capacitor (1), rectifier bridge (2), dc switch (3), pumping motor (5) is provided with main switching control, braking circuit is in parallel with the main switching control of pumping motor (5), and rectifier bridge (2) is connected with AC power (13), limiting capacitor (1).