CN201474975U - Broken-pole protection device of screw pump - Google Patents

Abstract

The utility model relates to a broken-pole protection device of a screw pump, mainly solving the problem that the ground dragging device of the existing screw pump can not limit the torque of the dragging device, which causes the breakage or the releasing of a sucker rod. The broken-pole protection device of the screw pump is characterized in that a motor is connected with a broken-pole protection unit; a polish rod is connected with a revolution speed sensor component; the broken-pole protection unit comprises a microcomputer chip, an interface circuit, a power circuit, a voltage sensing circuit, a current sensing circuit, a drive circuit, a key display circuit and a power factor detection circuit, wherein the power circuit, the voltage sensing circuit, the current sensing circuit, the drive circuit, the key display circuit and the power factor detection circuit are respectively connected with the microcomputer chip and the interface circuit; and the rotating speed sensor component comprises a rotating part and a static part. The broken-pole protection device reasonably limits the largest torque born by the sucker rod, prevents the sucker rod from being damaged or broken and released by bearing overlarge torque, reduces the fatigue degree of the sucker rod, prolongs the service life of the sucker rod and enhances the system efficiency and the safety property of the device.

Description

A kind of screw pump bar protective gear that breaks

Technical field:

The utility model relates to mechanical oil recovery ground installation protective gear in the oil recovery field, oil field, particularly a kind of screw pump bar protective gear that breaks.

Background technique:

In oil recovery field, oil field, screw pump progressively is used widely in the oil field as a kind of novel lifting equipment.Screw pump generally adopts the driving mode of motor belt transmission, speed reduction gear box double reduction in the existing screw pump mechanical oil recovery ground installation.For bigger moment of torsion can be provided so that start smoothly, select more powerful motor, bring a problem: when block the down-hole, paraffin blockage or when being applied to thick oil well thereupon, owing to can not the moment of torsion of actuator be limited, very easily cause the overtired of sucker rod and cause rod broken or dropout.

The model utility content:

Thereby the utility model is to overcome the problem that moment of torsion that the existing screw pump ground actuator that exists in the background technique can not limit actuator causes rod broken or dropout; and provide a kind of screw pump bar protective gear that breaks; this device can limit the moment of torsion of drive unit, reduces the chance that sucker rod breaks, takes off.

The invention for solving the technical problem can reach by following technical solution: the disconnected bar protective gear of this screw pump comprises motor, polished rod, described motor is connected to disconnected bar protected location, polished rod connects the speed probe assembly, adopts cable or wireless connections between disconnected bar protected location and the speed probe assembly; Described disconnected bar protected location comprises microcomputer chip and interface circuit and distinguishes connected power circuit, voltage sensing circuit, current sense circuit, drive circuit, keyboard-display circuit, detection circuit of power factor, voltage sensing circuit, power circuit connect ac power supply, be installed with the current transformer of current sense circuit on the inlet wire of motor respectively, the relay tip of drive circuit connects the control loop of the A.C. contactor of control motor; Described speed probe assembly comprises rotary component and static part, and rotary component is fixed on the polished rod.

Described rotary component main body is that non-magnet material posts magnet steel, and the sensing element of static part is a Hall unit.

The utility model is compared with the above-mentioned background technology can have following beneficial effect: the disconnected bar protective gear of this screw pump is owing to adopt said structure; power circuit; voltage sensing circuit; current sense circuit; drive circuit; keyboard-display circuit; detection circuit of power factor; the moment of torsion that the speed probe assembly bears by microcomputer chip and interface circuit continuous detecting polished rod; when surpassing the Maximum Torque of setting; the control loop of motor; deenergization; the Maximum Torque that the reasonable limits sucker rod bears; particularly block in the down-hole; paraffin blockage or when being applied to thick oil well; avoid taking place causing sucker rod to sustain damage or causing breaking because of bearing excessive moment of torsion; the possibility of taking off; reduced the degree of fatigue of sucker rod; prolong the working life of sucker rod, guaranteed safety in production.

Description of drawings:

Accompanying drawing 1 is a theory diagram of the present utility model;

Accompanying drawing 2 is electric hookups of the present utility model.

Among the figure: 1-power circuit, 2-voltage sensing circuit, 3-current sense circuit; the 4-current transformer, 5-microcomputer chip and interface circuit, 6-drive circuit; the 7-keyboard-display circuit, 8-detection circuit of power factor, 9-motor; the 10-polished rod, 11-rotary component, 12-static part; the 13-speed reducer; 14-A.C. contactor, the V1-bar protected location that breaks, V2-speed probe assembly.

Embodiment:

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

As accompanying drawing 1, shown in Figure 2, a kind of screw pump bar protective gear that breaks comprises motor 9, polished rod 10, described motor 9 is connected to disconnected bar protected location V1, and polished rod 10 is connected to speed probe assembly V2, adopts cable or wireless connections between disconnected bar protected location V1 and the speed probe assembly V2; Disconnected bar protected location V1 comprises microcomputer chip and interface circuit 5 and the power circuit 1 that is connected with microcomputer chip and interface circuit 5 respectively, voltage sensing circuit 2, current sense circuit 3, drive circuit 6, keyboard-display circuit 7, detection circuit of power factor 8, voltage sensing circuit 2, power circuit 1 connection ac power supply.Described voltage sensing circuit 2 is used to detect the supply voltage U of motor; Current transformer 4 in the described current sense circuit 3 is core-theaded type current transformer or other forms of current transformer, is used to detect the electric current I of motor; Described detection circuit of power factor 8 is used to detect the phase difference between electric current and voltage, thereby obtains powerfactorcos; Be installed with the current transformer 4 of current sense circuit 3 on the inlet wire of motor 9, the relay tip of drive circuit 6 connects the control loop of the A.C. contactor 14 of control motor.Described speed probe assembly V2 comprises rotary component 11 and static part 12, and rotary component 11 main bodys are that non-magnet material posts magnet steel or permeability magnetic material, and the sensing element of static part 12 is a Hall unit.

When system powers on since moment of torsion less than setting moment of torsion, contact BH-1 closure allows motor normally to start.In startup and normally in service; especially in the start-up course; microcomputer chip and interface circuit 5 are constantly by voltage sensing circuit 2; current sense circuit 3; detection circuit of power factor 8; detect the electric current I of motor; voltage U; factor cos φ; speed probe assembly V2 detects the rotation speed n of screw pump; in real time calculated torque and with the protection value of setting relatively; through continuous detecting after a while; after being generally one to tens of seconds continuous detecting; if transfinite always; the output contact BH-1 of the drive circuit 6 of disconnected bar protected location V1 disconnects; A.C. contactor 14 discharges; the motor outage; the keyboard-display circuit 7 of disconnected bar protected location V1 shows related data; the equal keys available of all data is selected to check, until outage.Because the disconnected bar protective gear of screw pump has limited the Maximum Torque that sucker rod bears, sucker rod is unlikely to because of bearing the possibility that excessive moment of torsion causes sucker rod to sustain damage and takes place to break and take off.

Fundamental formular according to the screw pump motor torque:

P=M*n/9550 is M=9550P/n then

Wherein: P-power of motor (kw) M-Motor torque (Nm), motor speed (change/min)

According to principle of conservation of energy:

P _Pump=CP _MotorC-mechanical transmission coefficient wherein

P then _Pump=1.732CUI cos φ

M _Pump=1.732CUI 9550 cos φ/n=16540.6CUI cos φ/n......... (1)

Mechanical transmission coefficient C is a definite value substantially, can measure in advance, import by keyboard, powerfactorcos is to obtain by the phase difference that detection circuit of power factor 8 detects between electric current I and the voltage U, real-time detected rotating speed of motor n, electric current I, voltage U, the above-mentioned formula of powerfactorcos substitution (1) can be obtained the real-time moment of torsion of sucker rod.

The rotary component 11 of described speed probe assembly V2 is one or two and is fixed on the nonmagnetic substance that plays rotation on the polished rod 10 with one that post 1 to several pieces permanent-magnet steels along the nonmagnetic substance circumference, rotary component 11 also can use permeability magnetic material; Static part 12 is the hall switch sensing circuit, it also can be the sensor of the responsive principle of electromagnetism, electric capacity or inductance, static part is made hermetic waterproof module and is fixed on the end cap of speed reducer 13, or is fixed on other and can correctly detects rotating speed and installation, maintenance appropriate location easily.Concrete detailed structure should design according to the concrete structure of screw pump and the sensing element of selecting for use.What present embodiment was selected for use is that hall switch circuit and non-magnet material post magnet steel, and advantage is simple in structure, and cost is low.

During use; disconnected bar protected location V1 is that microcomputer chip and interface circuit 5, power circuit 1, voltage sensing circuit 2, current sense circuit 3, drive circuit 6, keyboard-display circuit 7, detection circuit of power factor 8 place one independently in the housing; can be installed in the suitable position of electric control box of screw pump; mode by cable or wireless transport module is connected with speed probe assembly V2; conveniently use and keep in repair, speed probe assembly V2 makes hermetic waterproof module so that adapt to wild environment.

The disconnected bar protective gear of this screw pump can limit the Maximum Torque of drive unit, reduces the degree of fatigue of sucker rod, reduces the chance that sucker rod breaks, takes off, and increases the service life.

Claims (2)

1. the disconnected bar protective gear of a screw pump, comprise motor (9), polished rod (10), it is characterized in that: described motor (9) is connected to disconnected bar protected location (V1), polished rod (10) connects speed probe assembly (V2), adopts cable or wireless connections between disconnected bar protected location (V1) and the speed probe assembly (V2); Described disconnected bar protected location (V1) comprises microcomputer chip and interface circuit (5) and distinguishes connected power circuit (1), voltage sensing circuit (2), current sense circuit (3), drive circuit (6), keyboard-display circuit (7), detection circuit of power factor (8), voltage sensing circuit (2), power circuit (1) connect ac power supply, be installed with the current transformer (4) of current sense circuit (3) on the inlet wire of motor (9) respectively, the relay tip of drive circuit (6) connects the control loop of the A.C. contactor (14) of control motor; Described speed probe assembly (V2) comprises rotary component (11) and static part (12), and rotary component (11) is fixed on the polished rod (10).

2. the screw pump according to claim 1 bar protective gear that breaks, it is characterized in that: described rotary component (11) main body is that non-magnet material posts magnet steel, and the sensing element of static part (12) is a Hall unit.

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