Power supply circuit and power supply system applied to petroleum kowtow machine

Abstract

The utility model relates to the technical field of petroleum kowtow machine power supply, in particular to a power supply circuit and a power supply system applied to a petroleum kowtow machine. The power supply circuit comprises a thermal relay, a motor driver and a contactor, the thermal relay is electrically connected with the contactor, and the thermal relay is electrically connected with the motor driver; an AC power supply module; and the direct current power supply module comprises a circuit breaker QFD1, a frequency converter VFD1 and an electric reactor R1. Compared with a traditional multi-program mode of current conversion, the method can reduce the use of conversion programs and equipment, and greatly reduces the energy loss and the cost in the oil exploitation process. Meanwhile, excess electric energy in the working process of the kowtow machine can be recycled through the system, meanwhile, compared with a traditional current conversion multi-program mode, the use of conversion programs and equipment can be reduced, and the energy loss and the cost in the oil exploitation process are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply for petroleum kowtow machines, in particular to a power supply circuit and a power supply system applied to petroleum kowtow machines. Background Art

[0002] The kowtow machine mainly consists of a donkey head, a walking beam, a connecting rod, a crank mechanism, a reduction gear, a power unit, and auxiliary equipment. During operation, the electric motor's power is converted into the up-and-down motion of the donkey head through the gearbox and the crank mechanism. The donkey head then drives the plunger of the downhole oil pump up and down through the polished rod and the sucker rod, thereby continuously pumping crude oil out of the wellbore.

[0003] When the equipment is running, the motor consumes a lot of electricity when the bulky donkey head drives the plunger of the oil pump to move upward. When the pressure of the donkey head moves downward, the motor will also consume some electricity when idling. The traditional power supply method usually uses DC to AC, and then AC to DC to power the motor. This power supply method not only has many conversion processes and increases the use of conversion equipment, but also increases the loss of electricity during the current conversion process, which will lead to a lot of energy waste in the oil field exploitation process and greatly increase the exploitation cost. Utility Model Content

[0004] The utility model provides a power supply circuit and a power supply system applied to a petroleum kowtow machine, which are used to solve the problem of large power loss in current conversion procedures in the prior art.

[0005] To solve the above problems, in a first aspect, the present invention provides a power supply circuit for a petroleum kowtow machine, comprising:

[0006] A thermal relay, a motor driver and a contactor, wherein the thermal relay is electrically connected to the contactor, and the thermal relay is electrically connected to the motor driver;

[0007] An AC power supply module, the AC power supply module comprising a circuit breaker QFA1, the circuit breaker QFA1 being electrically connected to the contactor KM1;

[0008] A DC power supply module includes a circuit breaker QFD1, a frequency converter VFD1 and a reactor R1. The circuit breaker QFD1 is electrically connected to the frequency converter VFD1, the frequency converter VFD1 is electrically connected to the reactor R1, and the reactor R1 is electrically connected to KM2 of the contactor.

[0009] According to the first aspect above, the power supply circuit further includes a load motor, and the load motor is electrically connected to the motor driver.

[0010] In a second aspect, the utility model further provides a power supply system, which includes multiple power supply circuits used for oil kowtow machines in the above-mentioned schemes, and the power supply circuits are used to provide the electrical energy required for the operation of multiple load motors.

[0011] According to the second aspect above, in a preferred embodiment, the power supply system further includes:

[0012] An energy storage device, used to store the reflux electric energy during the operation of the kowtow machine, wherein the energy storage device is electrically connected to the electric energy circulation device;

[0013] A power distribution device is used to electrically connect the load motor and the electric energy circulation device; the power distribution device is used to provide electric energy to the load motor and to transmit excess electric energy back to the electric energy circulation device when the load motor is in a non-power-consuming state.

[0014] According to the above second aspect, in a preferred embodiment, the electric energy circulation device includes:

[0015] a charge-discharge circuit, for electrically connecting the power distribution device and the energy storage device, respectively, for converting excess electrical energy and storing it in the energy storage device;

[0016] A power driving module, connected to the charging and discharging circuit, for driving the charging and discharging circuit;

[0017] A control module is connected to the power drive module and is used to output a PWM signal to control the charge and discharge circuit via the power drive module. The control module includes a single-chip microcomputer, a current detection circuit, a voltage detection circuit, and a temperature detection circuit. The single-chip microcomputer is connected to the charge and discharge circuit and is driven by a power supply chip. Analog signals are sampled and input into the single-chip microcomputer, and the core control function of the system is completed through a logic program. The current detection circuit and the voltage detection circuit are respectively connected to the single-chip microcomputer and the charge and discharge circuit, and the temperature detection circuit is connected to the single-chip microcomputer.

[0018] According to the above second aspect, in a preferred embodiment, the charging and discharging circuit includes: a charging circuit, a discharging circuit, a first energy storage capacitor recharging circuit and a second energy storage capacitor charging circuit, wherein the positive electrode of the energy storage capacitor No. 1 is connected through a first diode, and then connected to the positive electrode of the energy storage device through a fifth diode and a first switching tube, and the negative electrode of the energy storage device is connected to the negative output end of the distribution device; the positive electrode of the energy storage device is then connected to a fourth diode, and the positive electrode of the energy storage capacitor No. 2 is also connected to a third diode. The two diodes are connected in parallel to output two paths, one to an energy storage inductor, and the other to the negative output end of the generator through a fourth switching tube; the other end of the energy storage inductor also outputs two paths, one is connected to the positive electrode of the energy storage capacitor No. 1 through a second diode, and the other is connected to the negative output end of the distribution device through a third switching tube; the negative electrode of the energy storage device is connected in parallel with the negative electrode of the energy storage capacitor No. 2, and the positive electrode of the energy storage capacitor No. 1 is connected to the positive electrode of the energy storage capacitor No. 2 through a sixth diode and a second switching tube.

[0019] The beneficial effects of the present invention are as follows: the present invention proposes a power supply circuit for an oil kowtow machine, comprising a thermal relay, a motor driver, and a contactor, wherein the thermal relay is electrically connected to the contactor, and the thermal relay is electrically connected to the motor driver; an AC power supply module, wherein the AC power supply module comprises a circuit breaker QFA1, and the circuit breaker QFA1 is electrically connected to KM1 of the contactor; and a DC power supply module, wherein the DC power supply module comprises a circuit breaker QFD1, a frequency converter VFD1, and a reactor R1, wherein the circuit breaker QFD1 is electrically connected to the frequency converter VFD1, the frequency converter VFD1 is electrically connected to the reactor R1, and the reactor R1 is electrically connected to KM2 of the contactor. This solution adopts a DC power supply method, thereby reducing the conversion process and the amount of equipment used, greatly reducing energy loss and costs in the oil extraction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 shows a schematic diagram of the overall circuit structure of the power supply circuit;

[0022] Figure 2 shows a schematic diagram of the circuit structure of the power supply system;

[0023] Figure 3A schematic diagram of the power supply process of the energy storage device is shown;

[0024] Figure 4 Shows a schematic diagram of the control flow structure of the electric energy circulation device;

[0025] Figure 5 The figure shows a circuit structure diagram of the electric energy circulation device.

[0026] Description of main component symbols:

[0027] 100-AC power supply module; 200-DC power supply module. DETAILED DESCRIPTION

[0028] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0031] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0032] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0033] See also Figure 1-2 The utility model provides a power supply circuit for a petroleum kowtow machine (hereinafter referred to as the power supply circuit). The power supply circuit includes: a thermal relay, a motor driver and a contactor. The thermal relay is electrically connected to the contactor, and the thermal relay is electrically connected to the motor driver.

[0034] On the basis of the above, the power supply circuit also includes an AC power supply module 100, which includes a circuit breaker QFA1, and the circuit breaker QFA1 is electrically connected to the contactor KM1; a DC power supply module 200, which includes a circuit breaker QFD1, a frequency converter VFD1 and a reactor R1, the circuit breaker QFD1 is electrically connected to the frequency converter VFD1, the frequency converter VFD1 is electrically connected to the reactor R1, and the reactor R1 is electrically connected to the contactor KM2.

[0035] The above power supply circuit can be used for DC power supply and AC power supply. When DC power supply is used, it is directly provided to the inverter and then converted into AC power to power the motor. When AC power is used, it is directly powered to the load motor. Compared with the traditional multi-program method of current conversion, it can reduce the conversion procedures and the use of equipment, greatly reducing energy loss and costs in the oil extraction process.

[0036] On the basis of the above solution, the power supply circuit further includes a load motor, which is electrically connected to the motor driver and is used to drive the kowtow machine to move.

[0037] Please continue reading Figure 2-5 On the basis of the above scheme, this scheme also provides a power supply system, which includes the above-mentioned multiple power supply circuits, and the power supply circuits are used to provide the electrical energy required for the operation of multiple load motors.

[0038] See also Figure 3Specifically, the power supply system includes an energy storage device for storing the return electric energy of the kowtow machine during operation, and the energy storage device is electrically connected to an electric energy circulation device; a power distribution device, and the power distribution device is used to electrically connect the load motor and the electric energy circulation device; the power distribution device is used to provide electric energy to the load motor and to transmit excess electric energy back to the electric energy circulation device when the load motor is in a non-power-consuming state.

[0039] See also Figure 4 Specifically, the electric energy circulation device includes: a charge and discharge circuit, which is used to electrically connect the power distribution device and the energy storage device respectively, and convert the excess electric energy into and store it in the energy storage device; a power drive module, which is connected to the charge and discharge circuit, and is used to drive the charge and discharge circuit; a control module, which is connected to the power drive module, and is used to output a PWM signal to control the charge and discharge circuit via the power drive module. The control module includes a single-chip microcomputer, a current detection circuit, a voltage detection circuit and a temperature detection circuit. The single-chip microcomputer is connected to the charge and discharge circuit and is driven by the power supply chip. The analog signal is sampled and input into the single-chip microcomputer, and the core control function of the system is completed through the logic program; the current detection circuit and the voltage detection circuit are respectively connected to the single-chip microcomputer and the charge and discharge circuit, and the temperature detection circuit is connected to the single-chip microcomputer.

[0040] See also Figure 5 Specifically, the charging and discharging circuit includes: a charging circuit, a discharging circuit, a first energy storage capacitor recharging circuit and a second energy storage capacitor charging circuit, wherein the positive electrode of the energy storage capacitor No. 1 is connected through a first diode, and then connected to the positive electrode of the energy storage device through a fifth diode and a first switching tube, and the negative electrode of the energy storage device is connected to the negative output end of the power distribution device; the positive electrode of the energy storage device is then connected to a fourth diode, and the positive electrode of the energy storage capacitor No. 2 is also connected to a third diode. The two diodes are connected in parallel to output two paths, one path is connected to an energy storage inductor, and the other path is connected to the negative output end of the generator through a fourth switching tube; the other end of the energy storage inductor also outputs two paths, one path is connected to the positive electrode of the energy storage capacitor No. 1 through a second diode, and the other path is connected to the negative output end of the power distribution device through a third switching tube; the negative electrode of the energy storage device is connected in parallel with the negative electrode of the energy storage capacitor No. 2, and the positive electrode of the energy storage capacitor No. 1 is connected to the positive electrode of the energy storage capacitor No. 2 through a sixth diode and a second switching tube.

[0041] It's important to explain that the donkey head of the kowtow machine consumes energy when pulling upward, but not when moving downward. Therefore, a DC power supply is used to power the load motors corresponding to the multiple kowtow units. When not consuming energy, the remaining energy can be recharged back into the energy storage device for storage. Furthermore, compared to the traditional DC-to-AC and AC-to-DC power supply method, this solution can reduce energy conversion losses and the number of devices, significantly lowering energy supply costs.

[0042] The present invention also provides an energy-saving network group for an oil kowtow machine. The energy-saving network group adopts the above-mentioned system for power supply, thereby greatly reducing the energy loss and production cost of oil extraction in a large area.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0044] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A power supply circuit for a petroleum kowtow machine, characterized in that: include: A thermal relay, a motor driver and a contactor, wherein the thermal relay is electrically connected to the contactor, and the thermal relay is electrically connected to the motor driver; An AC power supply module, the AC power supply module comprising a circuit breaker QFA1, the circuit breaker QFA1 being electrically connected to the contactor KM1; A DC power supply module includes a circuit breaker QFD1, a frequency converter VFD1 and a reactor R1. The circuit breaker QFD1 is electrically connected to the frequency converter VFD1, the frequency converter VFD1 is electrically connected to the reactor R1, and the reactor R1 is electrically connected to KM2 of the contactor.

2. The power supply circuit for the oil kowtow machine according to claim 1, characterized in that: The power supply circuit further includes a load motor, and the load motor is electrically connected to the motor driver.

3. A power supply system, characterized in that: The power supply circuit for a petroleum kowtow machine comprises the power supply circuit described in any one of claims 1-2, wherein the power supply system comprises a plurality of the power supply circuits, and the power supply circuits are used to provide the electrical energy required for the operation of a plurality of load motors.

4. The power supply system according to claim 3, characterized in that: The power supply system further includes: An energy storage device, used to store the reflux electric energy during the operation of the kowtow machine, wherein the energy storage device is electrically connected to the electric energy circulation device; A power distribution device is used to electrically connect the load motor and the electric energy circulation device; the power distribution device is used to provide electric energy to the load motor and to transmit excess electric energy back to the electric energy circulation device when the load motor is in a non-power-consuming state.

5. The power supply system according to claim 4, characterized in that: The electric energy circulation device comprises: a charge-discharge circuit, for electrically connecting the power distribution device and the energy storage device, respectively, for converting excess electrical energy and storing it in the energy storage device; A power driving module, connected to the charging and discharging circuit, for driving the charging and discharging circuit; A control module is connected to the power drive module and is used to output a PWM signal to control the charge and discharge circuit via the power drive module. The control module includes a single-chip microcomputer, a current detection circuit, a voltage detection circuit, and a temperature detection circuit. The single-chip microcomputer is connected to the charge and discharge circuit and is driven by a power supply chip. Analog signals are sampled and input into the single-chip microcomputer, and the core control function of the system is completed through a logic program. The current detection circuit and the voltage detection circuit are respectively connected to the single-chip microcomputer and the charge and discharge circuit, and the temperature detection circuit is connected to the single-chip microcomputer.

6. The power supply system according to claim 5, characterized in that: The charging and discharging circuit includes: a charging circuit, a discharging circuit, a first energy storage capacitor recharging circuit and a second energy storage capacitor charging circuit, wherein the positive electrode of the energy storage capacitor No. 1 is connected through a first diode, and then connected to the positive electrode of the energy storage device through a fifth diode and a first switching tube, and the negative electrode of the energy storage device is connected to the negative output end of the distribution device; the positive electrode of the energy storage device is then connected to a fourth diode, and the positive electrode of the energy storage capacitor No. 2 is also connected to a third diode. These two diodes are connected in parallel to output two paths, one path is connected to an energy storage inductor, and the other path is connected to the negative output end of the generator through a fourth switching tube; the other end of the energy storage inductor also outputs two paths, one path is connected to the positive electrode of the energy storage capacitor No. 1 through a second diode, and the other path is connected to the negative output end of the distribution device through a third switching tube; the negative electrode of the energy storage device is connected in parallel with the negative electrode of the energy storage capacitor No. 2, and the positive electrode of the energy storage capacitor No. 1 is connected to the positive electrode of the energy storage capacitor No. 2 through a sixth diode and a second switching tube.

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