Pumping unit energy-saving device, pumping unit and pumping unit energy-saving method

Abstract

The invention relates to the field of energy-saving control, and provides a pumping unit energy-saving device, a pumping unit and a pumping unit energy-saving method. The terminal strip is electrically connected with a frequency converter bus of the oil pumping unit; the first direct-current air switch is connected with the negative electrode of the super capacitor and is connected with the negative electrode of a frequency converter direct-current bus of the oil pumping unit through the terminal strip; the negative electrode of the voltage relay is electrically connected with the negative terminal of the super capacitor, and the voltage relay is used for monitoring the voltage of the super capacitor; and the positive electrode end of the first intermediate relay is electrically connected with the positive electrode of the voltage relay through a resistor. The pumping unit energy-saving device is used for overcoming the defects of the pumping unit energy-saving device in the prior art in the aspects of energy management, power grid adaptability and the like. The pumping unit energy-saving device provided by the scheme of the invention can reduce active loss, harmonic pollution and energy consumption.

Description

Technical Field

[0001] This invention relates to the field of energy-saving control technology, and in particular to an energy-saving device for an oil pumping unit, as well as an oil pumping unit and an energy-saving method for an oil pumping unit. Background Technology

[0002] Oil is a widely used energy source, and oil extraction requires the use of pumping units. However, during the operation of these pumping units, voltage fluctuations in the power grid, whether drops or rises, can significantly impact the control system of the pumping units. Under unstable power grid voltage conditions, frequency converters may fail to maintain stable and reliable operation, thereby affecting overall oil extraction efficiency and safety.

[0003] For the reasons mentioned above, most oil pumping units employ energy-saving devices for energy control during operation. These devices are mainly divided into two types. The first type uses a frequency converter braking unit. Its working principle involves configuring a braking resistor in the DC circuit to absorb the regenerative energy generated by the motor during deceleration or braking, thus achieving rapid braking. For example, the downward potential energy of the pumping unit rod needs to be converted into heat energy by the frequency converter's braking resistor and dissipated. However, this not only causes unnecessary energy consumption but may also affect oil production efficiency. The second type uses frequency converter regenerative braking technology to invert and directly feed the regenerative energy generated during deceleration or braking back to the power grid. This technology not only has a significant impact on the motor and power grid, but also involves complex conversion processes, large energy losses, and causes harmonic losses and pollution to the power grid. This wastes a large amount of electrical energy and increases the maintenance costs of the oil pumping equipment.

[0004] In summary, the energy-saving devices for oil pumping units in the relevant technologies have shortcomings in terms of energy management and grid adaptability. In order to reduce active power loss, harmonic pollution and energy consumption, a more efficient and environmentally friendly energy-saving technology is essential. Summary of the Invention

[0005] This invention provides an energy-saving device for an oil pumping unit, as well as an oil pumping unit and an energy-saving method for an oil pumping unit, to address the shortcomings of related energy-saving devices for oil pumping units in terms of energy management and grid adaptability. The energy-saving device for an oil pumping unit provided by this application can reduce active power loss, harmonic pollution, and energy consumption.

[0006] This invention provides an energy-saving device for an oil pumping unit, comprising: Supercapacitors; Terminal block, electrically connected to the inverter bus of the oil pumping unit; The first DC air switch is connected to the negative terminal of the supercapacitor and to the negative terminal of the inverter DC bus of the pumping unit via the terminal block; A voltage relay, the negative terminal of which is electrically connected to the negative terminal of the supercapacitor, is used to monitor the voltage of the supercapacitor; The positive terminal of the first intermediate relay is electrically connected to the positive terminal of the voltage relay through a resistor.

[0007] The oil pumping unit energy-saving device provided by the present invention further includes a second intermediate relay; The second intermediate relay is electrically connected to the first DC air switch; The coil of the second intermediate relay is electrically connected to the voltage relay.

[0008] The oil pumping unit energy-saving device provided by the present invention further includes a switching power supply, which is used to convert alternating current to direct current. The positive terminal of the switching power supply is connected to the terminal block.

[0009] The oil pumping unit energy-saving device provided by the present invention further includes a second DC air switch; The input terminal of the second DC air switch is electrically connected to the terminal block; The output terminal of the second DC air switch is electrically connected to the switching power supply.

[0010] The oil pumping unit energy-saving device provided by the present invention further includes a first current relay; The first terminal of the first current relay is electrically connected to the negative terminal of the switching power supply; The second terminal of the first current relay is electrically connected to the first DC air switch.

[0011] The oil pumping unit energy-saving device provided by the present invention further includes a second current relay; The switching terminals of the second current relay are connected to the switching terminals of the first current relay; The switching terminal of the second current relay is connected to the first intermediate relay.

[0012] The oil pumping unit energy-saving device provided by the present invention further includes a time relay; The time relay is connected to both the switching terminal of the second current relay and the voltage relay. The time relay is connected to the switching terminal of the first current relay.

[0013] According to the energy-saving device for oil pumping units provided by the present invention, the second intermediate relay is electrically connected to the supercapacitor; A fuse is provided between the second intermediate relay and the supercapacitor, the fuse being used to blow when the current passing through exceeds a set threshold.

[0014] The present invention also provides an oil pumping unit, including any of the above-mentioned oil pumping unit energy-saving devices.

[0015] The present invention also provides an energy-saving method for an oil pumping unit, which applies any of the above-mentioned energy-saving devices for oil pumping units, including: Collect the first voltage from the voltage relay; When the first voltage is greater than a preset first voltage, the voltage relay is closed, and the supercapacitor begins to charge. When the voltage across the supercapacitor is greater than the first voltage, the supercapacitor is controlled to stop charging and begin discharging.

[0016] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement any of the above-described oil pumping unit energy-saving methods.

[0017] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-described oil pumping unit energy-saving methods.

[0018] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements any of the above-described oil pumping unit energy-saving methods.

[0019] The energy-saving device for oil pumping units provided by this invention can be directly connected to the DC bus of the frequency converter of the oil pumping unit, replacing the braking resistor of the frequency converter. Introducing a supercapacitor as an energy storage module not only enables efficient storage and utilization of electrical energy with reduced energy consumption, but also effectively mitigates the impact of sudden high load demands on the power grid during the start-up or braking process of the oil pumping unit, contributing to the stable operation of the power grid. Simultaneously, the application of supercapacitors can avoid harmonic interference problems caused by electrical energy feedback to the power grid. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the oil pumping unit energy-saving device provided in an embodiment of the present invention; Figure 2This is a schematic diagram of the main circuit principle of the oil pumping unit energy-saving device provided in the embodiment of the present invention; Figure 3 This is a schematic diagram of the control circuit principle of the oil pumping unit energy-saving device provided in an embodiment of the present invention; Figure 4 This is a schematic flowchart of the oil pumping unit energy-saving method provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the physical structure of the electronic device provided in an embodiment of the present invention.

[0022] in: 1-Busbar; 2-Terminal bar; 3-Switching power supply; 4-First current relay; 5-Voltage relay; 6-First DC air switch; 7-Fuse; 8-Supercapacitor; 9-Main power switch; 10-Power indicator light; 11-Close indicator light; 12-Charging indicator light; 13-Fault indicator light; 14-Base; 15-First fan; 16-Maintenance discharge terminal; 17-Second intermediate relay; 18-Second DC air switch; 19-Control button; 20 - Time relay; 21 - Second current relay; 22 - First intermediate relay; 23 - Second fan. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0024] Figure 1 This is a schematic diagram of the structure of the oil pumping unit energy-saving device provided in an embodiment of the present invention.

[0025] like Figure 1 As shown, this embodiment provides an energy-saving device for an oil pumping unit, including a busbar 1, a terminal block 2, a switching power supply 3, a first current relay 4, a time relay, a voltage relay 5, a first DC air switch 6, a fuse 7, a supercapacitor 8, a main power switch 9, a power indicator light 10, a closing indicator light 11, a charging indicator light 12, a fault indicator light 13, a base 14, a first fan 15, and a maintenance discharge terminal 16, etc. The energy-saving device for the oil pumping unit in this embodiment achieves energy saving through the charging and discharging of the supercapacitor, and the main power switch of the energy-saving device is responsible for starting and stopping the device.

[0026] In practice, a supercapacitor is an electronic component capable of storing and releasing large amounts of electrical charge. The working principle of a supercapacitor is based on charge separation and electric field storage. It possesses higher capacitance and energy density than traditional capacitors, as well as faster charging and discharging speeds, making it a novel energy storage device situated between traditional capacitors and rechargeable batteries. It offers advantages such as high power density, short charging time, long lifespan, good temperature characteristics, and energy efficiency.

[0027] The current relay is an electronic control device with a control system (also known as an input circuit) and a controlled system (also known as an output circuit). Its principle is to detect changes in the current of the circuit or main electrical components. When the current exceeds (or falls below) a certain set value, the relay activates, completing the relay control and protection functions. It can serve functions such as automatic adjustment, safety protection, and circuit switching.

[0028] A time relay is a type of relay whose output circuit only produces a sudden change (or contact action) after a specified precise time has elapsed after an input action signal is applied (or removed). It utilizes electromagnetic or mechanical principles to delay contact closing or opening. Its characteristic is a delay between the signal received by the attracting coil and the contact action. Time relays are generally used for controlling the starting process of motors, where time is a function of time.

[0029] An air circuit breaker is a protective device used in power systems. It uses electromagnetic force or heat to rapidly separate the contacts in a circuit, thereby cutting off the circuit. When an overload or short circuit occurs in the circuit, the current increases sharply. The air circuit breaker senses this change in current and triggers its protective action. In the event of overloads, short circuits, or other faults in the circuit, it can promptly disconnect the circuit, protecting electrical equipment and personal safety.

[0030] A fuse is an electrical device that breaks the circuit by melting its fusible element when the current exceeds a specified value. When a circuit malfunctions or becomes abnormal, the current surges, causing the conductor temperature to rise. The fuse then melts at this high temperature, cutting off the current and protecting the circuit from damage, such as burnt-out circuits, damaged components, or fires.

[0031] As a preferred technical solution of this design, the circuit breaker is a switching device used to protect circuits from damage caused by overcurrent, overload, or short circuit. It disconnects the circuit in the event of a short circuit or severe overload, thereby effectively protecting the electrical appliances in the circuit. It is an electrical safety device capable of closing, carrying, and interrupting current under normal circuit conditions to prevent circuit overload or short circuit. It can automatically disconnect the circuit when a problem occurs to prevent circuit damage or fire.

[0032] The energy-saving device for the pumping unit provided in this embodiment uses a supercapacitor as the energy storage module. The energy exchange between the pumping unit's potential energy and the supercapacitor occurs only between the motor and the supercapacitor, without direct feedback to the grid. This reduces the number of conversion steps and, because the energy does not need to be fed back to the grid, also reduces active power loss and harmonic loss. During periods when grid voltage fluctuations prevent the motor from operating normally, the supercapacitor rapidly releases its stored energy, ensuring stable and reliable motor operation. When high voltage fluctuations occur in the grid, the supercapacitor energy storage unit can quickly absorb some of the high-voltage energy, thereby ensuring the continued stable and reliable operation of the pumping unit control system and achieving grid fault ride-through. This invention has a scientifically sound structure, good energy-saving effect, and is suitable for widespread use.

[0033] In an exemplary embodiment, the internal circuit of the oil pumping unit energy-saving device provided by the present application may include a main circuit and a control circuit, wherein in the main circuit, the main power switch is responsible for starting and stopping the energy-saving device. The main circuit power supply is led out from the positive terminal of the inverter's DC bus and is first connected through the terminal block [X1:1]. The terminals [F2:1] of the first DC air switch 6 are connected to one end of the contact KM2 of the second intermediate relay 17, and the coil of KM2 is controlled by the contacts of the voltage relay 5. This ensures that current can flow through the contact KM2 of the second intermediate relay 17 only when the voltage relay 5 is in a specific state; A fuse 7 is connected between the contact KM2 of the second intermediate relay 17 and the supercapacitor 8. As a protective device, the fuse 7 can melt and break the circuit when the current exceeds its set value, thereby protecting the circuit and equipment from damage. The negative terminal of the supercapacitor is connected to the terminals [F2:5] of the first DC air switch 6, and the terminals [F2:5] are connected to the negative terminal of the inverter DC bus through the terminal block [X1:2], thus forming a complete main circuit.

[0034] In the control circuit, the mains power is connected to terminal blocks [X1:3] and [X1:4], and terminal block [X1:PE] is grounded through a ground wire. The second DC air switch 18 is used to control the on / off of the mains power. Its input terminals [F1:1] and [F1:3] are connected to terminal blocks [X1:3] and [X1:4], and its output terminals [F1:2] and [F1:4] are connected to the switching power supply 3. The switching power supply 3 is responsible for converting 220V AC power to 24V DC power. Its output terminals are connected to both ends of the power indicator light 10, as well as to the terminal block [X1:5] (positive terminal) and the first current relay 4 (negative terminal), respectively. The other end of the first current relay is connected to the terminal [F2:13] of the first DC air switch 6, while the terminal [F2:14] of the first DC air switch 6 is connected to the terminal block [X1:6]. The positive terminals [S1_F:13] and [S1_F:23] of the control button 19 for the oil pumping unit are both connected to the terminal block [X1:5] as its power input. The negative terminal [S1_F:14] of the control button 19 is connected to the switching terminal [KA1:41] of the first current relay 4, realizing the transmission of control signals. Another switching terminal [KA1:44] of the first current relay 4 is connected to both the time relay 20 and the switching terminal [KA2:11] of the second current relay 21. Furthermore, the switching terminal [KA2:12] of the second current relay 21 is connected to the first intermediate relay 22 and the closing indicator light 11. This means that when the second current relay 21 operates, the first intermediate relay 22 and the closing indicator light 11 will also respond accordingly. The negative terminal [S1_F:24] of control button 19 is also directly connected to the terminal [KT1:15] of time relay 20. The other terminal [KT1:18] of time relay 20 is simultaneously connected to the switch terminal [KA2:41] of the second current relay 21 and the terminal [U1:18] of the voltage relay 5, realizing the transmission of time control signals between multiple relays; The power supply terminals [U1:A1] and [U1:A2] of the voltage relay 5 are connected to the terminal block [X1:5] and the negative terminal of the power indicator 10, respectively, providing operating power to the power indicator 10. The terminal [KA2:42] of the second current relay 21 is connected to the fault indicator 13, and the charging indicator 12 is connected to the terminal [KA2:44] of the second current relay 21. In addition, the terminal [KA2:44] of the second current relay 21 is connected in parallel to the terminal [U1:15] of the second intermediate relay 17 and the voltage relay 5. In the normally open contact of the second intermediate relay 17, the [KM2:13] terminal is connected to the terminal block [X1:5], while the [KM2:14] terminal returns to the second current relay 21. The control button 19 of the oil pumping unit is connected to terminal [S1_F:13], which is connected to terminal [S2:13] of thermal switch S2. The other terminal [S2:14] of thermal switch S2 is connected to two fans, the other ends of which are connected to the negative terminal of power indicator H1.

[0035] In addition to the main circuit and control circuit described above, the energy-saving device also includes circuit structures for connection and maintenance discharge, as shown below: The terminals [F2:1] of the first DC air switch 6 are connected to the contacts KM2 of the second intermediate relay 17 and also to the contacts KM1 of the first intermediate relay 22. The positive terminal of contact KM1 of the first intermediate relay 22 is connected to the positive terminal of maintenance discharge terminal 16, and this positive terminal is also connected to the positive acquisition point of voltage relay 5 through a resistor R1. This connection method allows for voltage monitoring and ensures that maintenance discharge can be triggered when needed; The negative terminal of the maintenance discharge terminal 16 is connected to the positive terminal of the external circuit through the terminal block [X2:1], while the negative terminal of the supercapacitor is connected to the negative terminal of the external circuit through the terminal block [X2:2]. The negative terminal of the supercapacitor is also the negative sampling point of the voltage relay 5, which allows the voltage relay to monitor the voltage of the supercapacitor in real time.

[0036] Figure 2 This is a schematic diagram of the main circuit principle of the oil pumping unit energy-saving device provided in the embodiment of the present invention.

[0037] like Figure 2 As shown, in a specific embodiment, the main circuit of the pumping unit energy-saving device includes a frequency converter DC bus input terminal X1, a maintenance discharge terminal X2, and a voltage sampling terminal. The main circuit includes a first intermediate relay 22, a second intermediate relay 17, a resistor R1, a fuse 7, a supercapacitor group (C1, C2, C3, C4, C5, C6), and a first DC air switch 6.

[0038] Furthermore, the main circuit is equipped with a maintenance discharge terminal 16, which allows the current in the supercapacitor bank to be discharged when the supercapacitor bank needs to be repaired or replaced.

[0039] The supercapacitor bank in the main circuit is connected to the main circuit via fuse 7 to prevent excessive current from damaging the supercapacitors. The frequency converter is connected to the main circuit via the first DC air switch 6. After the first DC air switch 6 is closed, the frequency converter is connected to the circuit. The first DC air switch 6 has a leakage protection function. When the leakage current of the circuit exceeds a certain set value, it can automatically cut off the power supply to prevent accidents.

[0040] Figure 3 This is a schematic diagram of the control circuit principle of the oil pumping unit energy-saving device provided in the embodiment of the present invention.

[0041] like Figure 3 As shown, in a specific embodiment, the control circuit of the pumping unit energy-saving device includes a first DC air switch 6, a second DC air switch 18, a changeover switch S1, a switching power supply 3, a first current relay 4, a second current relay 21, a time relay 20, a second intermediate relay 17, a first fan 15, a second fan 23, a thermal switch S2, a power indicator light 10, a closing indicator light 11, a fault indicator light 13, and a charging indicator light 12.

[0042] One of the mains power lines L is connected to the switching power supply 3 via the second DC air switch 18. When the second DC air switch 18 closes and the first DC air switch 6 closes, the circuit is completed, and the power indicator light 10 illuminates. When the temperature inside the energy-saving device is too high, the thermistor switch is triggered, and the fan starts. When current flows through the coil of the first current relay 4, the normally open contact of the first current relay 4 closes, energizing the coil of the time relay 20, and the normally open contact of the time relay 20 closes after a delay. The coil of the first intermediate relay 22 is energized, and at the same time, the closing indicator light 11 illuminates, and the normally open contact of the first intermediate relay 22 in the main circuit closes. At this time, the supercapacitor bank begins pre-charging. After a delay, the normally open contact of the time relay 20 closes, and the fault indicator light 13 illuminates, indicating that the supercapacitor is waiting to be charged. When the voltage sampling circuit starts sampling a voltage greater than the set value, the normally open contact of U1 closes, energizing the coil of the second intermediate relay 17. The normally open contact of the second intermediate relay 17 then closes, energizing the coil of the second current relay 21. The normally open contact of the second current relay 21 closes, and its normally closed contact opens. The second intermediate relay 17 then self-locks, and the charging indicator light 12 illuminates, indicating that the supercapacitor bank is charging normally and can complete the charging and discharging process. If the sampled voltage is less than the set value, the second intermediate relay 17 cannot self-lock, and the fault indicator light 13 illuminates, indicating a circuit fault, and the supercapacitor cannot charge or discharge normally.

[0043] The following describes the working process of the energy-saving device for the pumping unit provided in this application. First, the main power switch controls the start and stop of the dedicated energy-saving device for the pumping unit. After the closing switch F1 is closed, the switching power supply converts AC to DC, illuminating the power indicator light. After judgment by the current relay, the auxiliary switch of the closing switch F2 is closed, and the frequency converter is ready to start operation. If the control button S1_F is closed, the closing indicator light illuminates, the first intermediate relay 22 is energized, and its corresponding contacts close, initiating pre-charging of the supercapacitor. When the voltage collected by the voltage relay 5 exceeds the set value, it closes, energizing the second intermediate relay 17, and its corresponding contacts close, initiating the charging process of the supercapacitor. Because the voltage across the supercapacitor is higher than the voltage across the DC bus, the supercapacitor discharges preferentially over the DC bus. Its current begins to provide energy for the upward movement of the pumping unit rod. When the voltage across the supercapacitor is lower than the voltage across the DC bus, the supercapacitor stops discharging and begins charging, and the dedicated energy-saving device for the pumping unit begins its cyclical operation.

[0044] In a preferred embodiment of this design, when the second DC air switch 18 is closed, the 220V AC mains power is converted to 24V DC power via the switching power supply 3. When the power indicator light 10 illuminates, it indicates that the power is on. Simultaneously, the first current relay 4 is triggered and remains continuously closed to ensure circuit stability. The auxiliary switch of the first DC air switch 6 closes, and the frequency converter is ready for operation.

[0045] After control button 19 is closed and the first current relay 4 is triggered, the set time relay will be activated. After a specified time, the time relay switch will be activated, simultaneously triggering the first intermediate relay 22 and the power indicator light 10. Activation of the first intermediate relay 22 will cause its corresponding normally open switch to operate, illuminating the power indicator light 10. At the same time, the supercapacitor in the main circuit begins pre-charging. After control button 19 is activated, the thermal switch senses the temperature inside the energy-saving device. If the temperature exceeds the set value, the switch closes, and the fan starts working to cool the energy-saving device. After time relay 20 reaches the preset value and activates, the charging indicator light 12 illuminates.

[0046] In the main circuit, the voltage across the supercapacitor is collected and compared with the control circuit voltage. If the voltage is greater than the control circuit voltage, the supercapacitor stops charging and begins discharging, and the closing indicator light 11 goes out. If the supercapacitor needs to be repaired, the current needs to be released through the maintenance discharge terminal 1. The voltage of the supercapacitor is then cleared to zero by the action of the external circuit before the repair work can begin. This process does not affect the user.

[0047] The energy-saving device for the oil pumping unit provided in this application has at least the following beneficial effects: (1) The supercapacitor, as an energy storage module, has the function of fast charging and discharging of large current. The potential energy of the oil rod of the pumping unit is converted into electrical energy through the motor power generation state and stored in the supercapacitor efficiently, without the need for the heat energy of the braking resistor to dissipate. At the same time, the electrical energy stored in the supercapacitor is quickly released through the frequency converter to drive the motor when the oil rod of the pumping unit moves upward. During this period, the frequency converter is powered by the supercapacitor, which saves electrical energy and reduces the impact on the instantaneous large load demand of the power grid. (2) The energy is exchanged only between the pumping unit's motor and the supercapacitor of the energy-saving device throughout the entire process, without being transferred to the power grid. This reduces the conversion links, indirectly reduces energy loss, reduces harmonic pollution and harmonic loss, and improves the reliability of power supply. (3) The grid voltage inevitably fluctuates greatly. Given the characteristics of supercapacitors’ rapid charging and discharging, the reliable and stable operation of the pumping unit control system is greatly guaranteed.

[0048] (4) The energy-saving device of the present invention has a cycle life of 500,000 cycles and extremely strong vitality. It will not ignite or explode under extreme conditions such as needle puncture, collision, and compression. The energy-saving device can be customized, such as being rainproof, corrosion-proof, and sun-proof.

[0049] The present invention also provides an oil pumping unit, including the oil pumping unit energy-saving device described in any of the above embodiments.

[0050] The energy-saving method for oil pumping units provided by the present invention is described below. The energy-saving method for oil pumping units described below can be referred to in correspondence with the energy-saving device for oil pumping units described above.

[0051] Figure 4 This is a schematic flowchart of the oil pumping unit energy-saving method provided in an embodiment of the present invention.

[0052] like Figure 4 As shown, the energy-saving method for oil pumping units provided in this embodiment includes: Step 401: Acquire the first voltage from the voltage relay; Step 402: When the first voltage is greater than the preset first voltage, control the voltage relay to close, and the supercapacitor begins to charge; Step 403: When the voltage across the supercapacitor is greater than the first voltage, control the supercapacitor to stop charging and start discharging.

[0053] The specific implementation method of the oil pumping unit energy-saving method provided in this embodiment can be carried out with reference to the above embodiment, and will not be repeated here.

[0054] Figure 5 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 5 As shown, the electronic device may include: a processor 510, a communication interface 520, a memory 530, and a communication bus 540, wherein the processor 510, the communication interface 520, and the memory 530 communicate with each other through the communication bus 540. The processor 510 can call logical instructions in the memory 530 to execute an energy-saving method for the oil pumping unit, the method including: Collect the first voltage from the voltage relay; When the first voltage is greater than a preset first voltage, the voltage relay is closed, and the supercapacitor begins to charge. When the voltage across the supercapacitor is greater than the first voltage, the supercapacitor is controlled to stop charging and begin discharging.

[0055] Furthermore, the logical instructions in the aforementioned memory 530 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0056] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer is able to execute the oil pumping unit energy-saving method provided by the above methods, the method including: Collect the first voltage from the voltage relay; When the first voltage is greater than a preset first voltage, the voltage relay is closed, and the supercapacitor begins to charge. When the voltage across the supercapacitor is greater than the first voltage, the supercapacitor is controlled to stop charging and begin discharging.

[0057] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the pumping unit energy-saving method provided by the methods described above, the method comprising: Collect the first voltage from the voltage relay; When the first voltage is greater than a preset first voltage, the voltage relay is closed, and the supercapacitor begins to charge. When the voltage across the supercapacitor is greater than the first voltage, the supercapacitor is controlled to stop charging and begin discharging.

[0058] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0059] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy-saving device for an oil pumping unit, characterized in that, include: Supercapacitors; Terminal block, electrically connected to the inverter bus of the oil pumping unit; The first DC air switch is connected to the negative terminal of the supercapacitor and to the negative terminal of the inverter DC bus of the pumping unit via the terminal block; A voltage relay, the negative terminal of which is electrically connected to the negative terminal of the supercapacitor, is used to monitor the voltage of the supercapacitor; The positive terminal of the first intermediate relay is electrically connected to the positive terminal of the voltage relay through a resistor.

2. The energy-saving device for an oil pumping unit according to claim 1, characterized in that, It also includes a second intermediate relay; The second intermediate relay is electrically connected to the first DC air switch; The coil of the second intermediate relay is electrically connected to the voltage relay.

3. The energy-saving device for an oil pumping unit according to claim 1, characterized in that, It also includes a switching power supply for converting alternating current to direct current; The positive terminal of the switching power supply is connected to the terminal block.

4. The energy-saving device for an oil pumping unit according to claim 3, characterized in that, It also includes a second DC air switch; The input terminal of the second DC air switch is electrically connected to the terminal block; The output terminal of the second DC air switch is electrically connected to the switching power supply.

5. The energy-saving device for an oil pumping unit according to claim 3, characterized in that, It also includes a first current relay; The first terminal of the first current relay is electrically connected to the negative terminal of the switching power supply; The second terminal of the first current relay is electrically connected to the first DC air switch.

6. The energy-saving device for an oil pumping unit according to claim 5, characterized in that, It also includes a second current relay; The switching terminals of the second current relay are connected to the switching terminals of the first current relay; The switching terminal of the second current relay is connected to the first intermediate relay.

7. The energy-saving device for an oil pumping unit according to claim 5, characterized in that, It also includes time relays; The time relay is connected to both the switching terminal of the second current relay and the voltage relay. The time relay is connected to the switching terminal of the first current relay.

8. The energy-saving device for an oil pumping unit according to claim 2, characterized in that, The second intermediate relay is electrically connected to the supercapacitor; A fuse is provided between the second intermediate relay and the supercapacitor, the fuse being used to blow when the current passing through exceeds a set threshold.

9. An oil pumping unit, characterized in that, Includes the oil pumping unit energy-saving device as described in any one of claims 1-8.

10. An energy-saving method for an oil pumping unit, applied to the energy-saving device for an oil pumping unit as described in any one of claims 1-8, characterized in that, include: Collect the first voltage from the voltage relay; When the first voltage is greater than a preset first voltage, the voltage relay is closed, and the supercapacitor begins to charge. When the voltage across the supercapacitor is greater than the first voltage, the supercapacitor is controlled to stop charging and begin discharging.

Images