CN212183439U

CN212183439U - Positive torque flexible control device

Info

Publication number: CN212183439U
Application number: CN202021316853.3U
Authority: CN
Inventors: 田青
Original assignee: Daqing Suofelectronic Technology Development Co ltd
Current assignee: Daqing Suofelectronic Technology Development Co ltd
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2020-12-18
Anticipated expiration: 2030-07-08

Abstract

The utility model discloses a flexible controlling means of positive torque, concretely relates to flexible controlling means of positive torque comprises major loop, control circuit and controller, the major loop include the converter, the major loop power connects to switch Q1, contactor KM2, brake resistance, controller and the control circuit of work under the frequency conversion is connected respectively to the converter. The utility model discloses a flexible controlling means of positive torque can control beam-pumping unit converter, adjusts beam-pumping unit speed, lets the oil pumping move under an efficient condition all the time to eliminate negative work. By increasing the frequency of the frequency converter, the rotating speed of the motor exceeds the rotating speed of the balance block, and the phenomenon that the balance block drags the motor to rotate can not occur. The output power of each period of the pumping unit is ensured to be constant by changing the rotating speed of the pumping unit at different angles in each period, so that the energy-saving effect is achieved.

Description

Positive torque flexible control device

The technical field is as follows:

the utility model relates to an oil field auxiliary assembly technical field, concretely relates to positive torque flexible control device.

Background art:

beam pumping units are the most common devices in oil fields. Since the number thereof is large, power consumption is large. The beam-pumping unit motor belongs to a four-quadrant running motor and has a regeneration power generation state. The power of the motor of the oil pumping machine is a wave curve. The output of the pumping unit is periodically changed along with the operation of the pumping unit. From maximum to minimum until negative work occurs (as shown in fig. 1). As shown in fig. 4, when the pumping unit balance weight moves from 180 degrees to 360 degrees, the balance weight moves rapidly due to the weight of the balance weight, and drives the motor to rotate, so that the power of the motor is smaller and smaller until negative work occurs. The motor operates, and the efficiency of the motor is higher the closer the motor operating power is to the rated power. The oil field pumping unit actually operates under a very low efficiency condition.

The utility model has the following contents:

the utility model aims at overcoming the shortcomings existing in the prior art and providing a positive torque flexible control device.

The utility model discloses a flexible controlling means of positive torque, by the major loop, control circuit and controller constitute, the major loop include the converter, the major loop power connects to switch Q1, the converter connects contactor KM2 of working under the frequency conversion respectively, brake resistance, controller and control circuit, working contactor KM2 connects working contactor KM1 and thermal relay protection KH1 under the power frequency under the frequency conversion, be equipped with control circuit switch Q2 on the control circuit, connect to single phase power on, Q3/Q4 is single phase power supply vary voltage back switch; the controller power supply is single-phase power supply input and is connected to the DCDC power supply module through the circuit breaker, the DTU is a 4G data transmission module, the two NPN proximity switches are directly connected with the DI input port of the controller, and the controller provides a 12V power supply for the proximity switches; a three-phase voltage measurement port connecting a power line providing a power supply of the motor to the controller voltage measurement port; and the three-phase current measuring port is used for connecting a power line for providing a motor power supply to the controller current measuring port through a current transformer outgoing line.

As a further improvement of the utility model, a frequency converter input port KO2/KO3 is arranged on the frequency converter.

As a further improvement of the utility model, a state indicator KI1/KI2 is arranged on the frequency converter.

As a further improvement of the utility model, the controller is provided with an automatic start-stop port of the motor.

The utility model discloses a flexible controlling means of positive torque can control beam-pumping unit converter, adjusts beam-pumping unit speed, lets the oil pumping move under an efficient condition all the time to eliminate negative work. By increasing the frequency of the frequency converter, the rotating speed of the motor exceeds the rotating speed of the balance block, and the phenomenon that the balance block drags the motor to rotate can not occur. The output power of each period of the pumping unit is ensured to be constant by changing the rotating speed of the pumping unit at different angles in each period, so that the energy-saving effect is achieved.

Description of the drawings:

FIG. 1 is a power-time curve for a pumping unit;

FIG. 2 is a schematic diagram of the main loop and control loop circuit of the present invention;

FIG. 3 is a schematic diagram of a controller circuit according to the present invention;

FIG. 4 is a diagram illustrating the relationship between angle, power, torque and frequency when the pumping unit balance weight is in operation.

FIG. 5 is a graph of raw power versus controlled power data.

The specific implementation mode is as follows:

as shown in fig. 2, the flexible control device for positive torque of the present invention comprises a main circuit, a control circuit and a controller, wherein the main circuit comprises a frequency converter, and a power supply of the main circuit is connected to a power switch Q1, so as to manually control the opening and closing of the power supply of the motor and the frequency converter; the frequency converter is respectively connected with the variable-frequency lower working contactor KM2, the brake resistor, the controller and the control loop, the variable-frequency lower working contactor KM2 is connected with the power-frequency lower working contactor KM1 and the thermal relay protection KH1, and when the control of the frequency converter is not needed, the power-frequency lower working contactor KM1 is in a closed state, so that the motor works at the power frequency; when the frequency converter is used for control, the working contactor KM2 is closed under the frequency conversion; when the current is overloaded, the thermal relay protects the KH1 to cut off the power supply and protect the motor to ensure the motor to run safely and reliably; the control loop is provided with a control loop power switch Q2 connected to a single-phase power supply, the Q3/Q4 is a power switch after the single-phase power supply transforms voltage, and the frequency converter is provided with a frequency converter input port KO2/KO3 for controlling the start, stop and reset of the motor; the brake resistor is mainly used in a mechanical system for controlling the motor to stop quickly by the frequency converter, and helps the motor to convert the regenerative electric energy generated by the motor due to quick stop into heat energy; a state indicator KI1/KI2 is arranged on the frequency converter; the frequency converters AO1/AO2 respectively provide analog quantity input for the controller so as to facilitate the detection of the controller; the frequency converter AI +/AI-is used for outputting an analog quantity signal for the controller and controlling the frequency converter; as shown in fig. 3, the controller power supply is a single-phase power input, and is connected to the DCDC power supply module through a circuit breaker to provide a dc 12V power supply for the controller; the DTU is a 4G data transmission module, and the controller is connected with the DTU through a bus; the two NPN type proximity switches are directly connected with the DI input port of the controller, the controller provides a 12V power supply for the proximity switches, and the proximity switches provide dead point and rotating speed data for the controller; a three-phase voltage measurement port connecting a power line providing a power supply of the motor to the controller voltage measurement port; the three-phase current measuring port is used for connecting a power line for providing a motor power supply to the controller current measuring port through a current transformer outgoing line; and the controller is provided with an automatic start-stop port of the motor so as to facilitate remote control. The frequency converter is produced by Shenzhen Taida industry Limited, the DCDC power supply module is produced by Yujia electronics technology Limited, and the DTU4G data transmission module is produced by Chengdu technology Limited.

As shown in fig. 4, when the pumping unit balance weight operates from 0 degree to 180 degrees, the larger the angle is, the larger the torque is, and the larger the power is. At this time, the frequency is adjusted to reduce the frequency, and the power is reduced along with the frequency. Thus, the angle increases, but the power does not change. By increasing the frequency of the frequency converter, the rotating speed of the motor exceeds the rotating speed of the balance block, and the phenomenon that the balance block drags the motor to rotate can not occur. The output power of each period of the pumping unit is ensured to be constant by changing the rotating speed of the pumping unit at different angles in each period. Thereby achieving the energy-saving effect.

The raw and controlled power for the same pumping unit are compared as shown in table 1 and fig. 5:

TABLE 1 Power output data comparison

The alignment results were calculated as follows:

the energy saving is about 9.8% by calculation.

Claims

1. A positive torque flexible control device is composed of a main loop, a control loop and a controller, and is characterized in that the main loop comprises a frequency converter, the power supply of the main loop is connected to a power switch Q1, the frequency converter is respectively connected with a contactor KM2 working under variable frequency, a brake resistor, the controller and the control loop, the contactor KM2 working under variable frequency is connected with a working contactor KM1 under power frequency and a thermal relay protection KH1, the control loop is provided with a control loop power switch Q2 which is connected to a single-phase power supply, and Q3/Q4 is a power switch after the single-phase power supply is transformed; the controller power supply is single-phase power supply input and is connected to the DCDC power supply module through the circuit breaker, the DTU is a 4G data transmission module, the two NPN proximity switches are directly connected with the DI input port of the controller, and the controller provides a 12V power supply for the proximity switches; a three-phase voltage measurement port connecting a power line providing a power supply of the motor to the controller voltage measurement port; and the three-phase current measuring port is used for connecting a power line for providing a motor power supply to the controller current measuring port through a current transformer outgoing line.

2. A positive torque compliance control device as claimed in claim 1, wherein said transducer has transducer input ports KO2/KO 3.

3. A positive torque compliance control device according to claim 1, wherein the transducer is provided with status indicators KI1/KI 2.

4. A positive torque compliance control device as claimed in claim 1, wherein the controller is provided with motor automatic start and stop ports.