Direct-current 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 direct-current power supply circuit and a power supply system applied to a petroleum kowtow machine. The direct current power supply circuit comprises a power supply module and a loop module, the power supply module comprises a circuit breaker QF1, a first reactor, a frequency converter VFD, a second reactor and a first alternating current contactor KM, and the loop module comprises a circuit breaker QF2, a fuse FU2, an impedance Z1, a current relay KA1, a current relay KA5, a current relay KA6 and a second alternating current contactor KM. The direct current can be supplied to the motor through the power supply module and the loop module, or the alternating current can be directly converted into the direct current to be supplied to the motor, and compared with a traditional current conversion multi-program mode, the use of conversion programs and equipment quantity 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 DC 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 DC 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 utility model provides a DC power supply circuit for a petroleum kowtow machine, comprising:

[0006] A power supply module, the power supply module including a circuit breaker QF1, a first reactor, a frequency converter VFD, a second reactor and a first AC contactor KM, the circuit breaker QF1 being connected to the first reactor, the first reactor being connected to the frequency converter VFD, the frequency converter VFD being connected to the second reactor, KM1 of the first AC contactor KM being connected between the circuit breaker QF1 and the first reactor, KM2 of the first AC contactor KM being connected between the frequency converter VFD and the second reactor, and KM3 of the first AC contactor KM being connected between the circuit breaker QF1 and the second reactor;

[0007] A loop module is electrically connected to the power supply module via a transformer TC.

[0008] According to the first aspect, in a preferred embodiment, the loop module includes a circuit breaker QF2, a fuse FU2, an impedance Z1, a current relay KA1, a current relay KA5, a current relay KA6 and a second AC contactor KM, the circuit breaker QF2 is connected to the fuse FU2, the fuse FU2 is connected to the impedance Z1, the circuit breaker QF2 is connected in series with the current relay KA1, the current relay KA5 and the current relay KA6 respectively, KM1 of the second AC contactor KM is connected to the current relay KA5, KM2 of the second AC contactor KM is connected to the current relay KA6, and KM3 of the second AC contactor KM is connected to the current relay KA1.

[0009] According to the first aspect, in a preferred embodiment, the loop module further includes an emergency stop switch E-STOP, and the emergency stop switch E-STOP is connected between the circuit breaker QF2 and the current relay KA5.

[0010] According to the first aspect, in a preferred embodiment, the loop module further includes a push button switch SB, and the push button switch SB is connected between the second AC contactor KM and the current relay KA1.

[0011] According to the first aspect, in a preferred embodiment, the circuit module further includes an indicator light HL, and the indicator light HL is connected between the fuse FU2 and the second AC contactor KM.

[0012] In a second aspect, the present invention further provides a power supply system, which includes the DC power supply circuit used for the petroleum kowtow machine in the above-mentioned solution.

[0013] The beneficial effects of the present invention are as follows: the present invention proposes a DC power supply circuit for an oil kowtow machine, comprising: a power supply module, the power supply module comprising a circuit breaker QF1, a first reactor, a frequency converter VFD, a second reactor, and a first AC contactor KM, wherein the circuit breaker QF1 is connected to the first reactor, the first reactor is connected to the frequency converter VFD, the frequency converter VFD is connected to the second reactor, KM1 of the first AC contactor KM is connected between the circuit breaker QF1 and the first reactor, KM2 of the first AC contactor KM is connected between the frequency converter VFD and the second reactor, and KM3 of the first AC contactor KM is connected between the circuit breaker QF1 and the second reactor; and a loop module, the loop module being electrically connected to the power supply module via a transformer TC. 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

[0014] 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.

[0015] Figure 1 shows the overall circuit structure schematic diagram of the DC power supply circuit;

[0016] Figure 2 A schematic diagram of the process structure of the power supply system is shown.

[0017] Description of main component symbols:

[0018] 10-DC power supply circuit; 100-power supply module; 200-loop module; 300-second AC contactor. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] See also Figure 1 The present invention provides a DC power supply circuit (hereinafter referred to as DC power supply circuit 10) for a petroleum kowtow machine. The DC power supply circuit 10 includes a power supply module 100 and a loop module 200. The power supply module 100 and the loop module 200 are electrically connected through a transformer TC.

[0025] Specifically, the power supply module 100 includes a circuit breaker QF1, a first inductor, a frequency converter VFD, a second inductor and a first AC contactor KM. The circuit breaker QF1 is connected to the first inductor, the first inductor is connected to the frequency converter VFD, the frequency converter VFD is connected to the second inductor, KM1 of the first AC contactor KM is connected between the circuit breaker QF1 and the first inductor, KM2 of the first AC contactor KM is connected between the frequency converter VFD and the second inductor, and KM3 of the first AC contactor KM is connected between the circuit breaker QF1 and the second inductor; the power supply module 100 is powered by AC power, and after the AC power is connected, it is converted into DC power by the frequency converter VFD and directly supplied to the load motor for power supply. Compared with the traditional DC to AC and AC to DC method, it not only reduces the conversion process, but also reduces the use of equipment and energy loss, greatly reducing the cost of oil extraction.

[0026] Please continue reading Figure 1 On the basis of the above solution, the DC power supply circuit 10 further includes a loop module 200, which is used for control and safety protection during the DC power supply process, thereby increasing the safety and stability of the DC power supply process.

[0027] Specifically, the loop module 200 includes a circuit breaker QF2, a fuse FU2, an impedance Z1, a current relay KA1, a current relay KA5, a current relay KA6 and a second AC contactor KM300. The circuit breaker QF2 is connected to the fuse FU2, the fuse FU2 is connected to the impedance Z1, the circuit breaker QF2 is connected in series with the current relay KA1, the current relay KA5 and the current relay KA6 respectively, KM1 of the second AC contactor KM300 is connected to the current relay KA5, KM2 of the second AC contactor KM300 is connected to the current relay KA6, and KM3 of the second AC contactor KM300 is connected to the current relay KA1.

[0028] Based on the above scheme, the loop module 200 also includes an emergency stop switch E-STOP, a push button switch SB and an indicator light HL, wherein the emergency stop switch E-STOP is connected between the circuit breaker QF2 and the current relay KA5; the push button switch SB is connected between the second AC contactor KM300 and the current relay KA1; the indicator light HL is connected between the fuse FU2 and the second AC contactor KM300.

[0029] What needs explanation is the AC contactor (also known as a relay). KM1 is the contactor's coil, KM2 is its normally open auxiliary contact, and KM3 is its main contact. The principle is simple: when the pushbutton switch SB is pressed, the AC contactor's KM coil is energized, KM3 is connected, and the motor is powered. Simultaneously, KM2 is also connected, short-circuiting the start button SB. This keeps the contactor closed even after the button is released. This process is called self-locking.

[0030] See also Figure 2 On the basis of the above scheme, this scheme also includes a power supply system (hereinafter referred to as the system), which includes the above-mentioned multiple DC power supply circuits, each DC power supply circuit is used to power a load motor.

[0031] Specifically, the DC power supply circuit uses a DC power supply method to supply power to the load motor. The DC power supply circuit also includes a motor driver, which also uses DC power. The busbar bus and reverse power generation are both DC. In actual application, the entire system uses urban electricity for power supply. When the first load motor consumes energy, the remaining energy will be transferred to the next load motor for power supply. After all load motors consume energy and there is still surplus energy, the excess energy will be reverse-charged and recycled into the energy storage device through the energy circulation device. Of course, how the energy storage device recycles energy is not the direction to be improved in this solution, so it will not be elaborated on in detail.

[0032] During the power supply process of the above system, there will be multiple energy consumption states. For example, when the urban electricity is used for power supply, the power provided just meets the consumption of the load motor group, and the urban electricity is used for normal power supply; when the urban electricity cannot meet the power supply of the load motor group, the energy storage device can replenish the power in time; when the urban electricity does not provide power, the energy storage device is used for power supply; when the urban electricity supply has surplus power, the surplus power is reversely charged and recovered into the energy storage device through the power circulation device; not only does it save the loss of repeated AC to DC and DC to AC conversion, but it also saves a lot of conversion equipment and reduces equipment costs.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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 DC power supply circuit for a petroleum kowtow machine, characterized in that: include: A power supply module, the power supply module including a circuit breaker QF1, a first reactor, a frequency converter VFD, a second reactor and a first AC contactor KM, the circuit breaker QF1 being connected to the first reactor, the first reactor being connected to the frequency converter VFD, the frequency converter VFD being connected to the second reactor, KM1 of the first AC contactor KM being connected between the circuit breaker QF1 and the first reactor, KM2 of the first AC contactor KM being connected between the frequency converter VFD and the second reactor, and KM3 of the first AC contactor KM being connected between the circuit breaker QF1 and the second reactor; A loop module is electrically connected to the power supply module via a transformer TC.

2. The DC power supply circuit for the oil kowtow machine according to claim 1, characterized in that: The loop module includes a circuit breaker QF2, a fuse FU2, an impedance Z1, a current relay KA1, a current relay KA5, a current relay KA6 and a second AC contactor KM. The circuit breaker QF2 is connected to the fuse FU2, the fuse FU2 is connected to the impedance Z1, the circuit breaker QF2 is simultaneously connected in series with the current relay KA1, the current relay KA5 and the current relay KA6, KM1 of the second AC contactor KM is connected to the current relay KA5, KM2 of the second AC contactor KM is connected to the current relay KA6, and KM3 of the second AC contactor KM is connected to the current relay KA1.

3. The DC power supply circuit for the oil kowtow machine according to claim 2, characterized in that: The loop module further includes an emergency stop switch E-STOP, which is connected between the circuit breaker QF2 and the current relay KA5.

4. The DC power supply circuit for a petroleum kowtow machine according to claim 2, characterized in that: The loop module further includes a push button switch SB, which is connected between the second AC contactor KM and the current relay KA1.

5. The DC power supply circuit for a petroleum kowtow machine according to claim 2, characterized in that: The circuit module further includes an indicator light HL, which is connected between the fuse FU2 and the second AC contactor KM.

6. A power supply system, characterized in that: The invention comprises a DC power supply circuit for a petroleum kowtow machine according to any one of claims 1 to 5.

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