CN110080733B - Underground dosing execution device - Google Patents
Underground dosing execution device Download PDFInfo
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- CN110080733B CN110080733B CN201910491690.8A CN201910491690A CN110080733B CN 110080733 B CN110080733 B CN 110080733B CN 201910491690 A CN201910491690 A CN 201910491690A CN 110080733 B CN110080733 B CN 110080733B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Chemical Kinetics & Catalysis (AREA)
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- Infusion, Injection, And Reservoir Apparatuses (AREA)
Abstract
The invention discloses an underground dosing execution device, which comprises: the oil liquid compensation mechanism comprises an input hydraulic cylinder and an oil tank connected with an oil inlet of the input hydraulic cylinder; an oil inlet of the hydraulic pump is connected with an oil outlet of the input hydraulic cylinder; an elastic energy storage element is arranged in the output hydraulic cylinder; the piston in the medicine injection hydraulic cylinder divides the medicine injection hydraulic cylinder into an oil cavity and a medicine cavity, the oil cavity is connected with an oil outlet of the output hydraulic cylinder, and the medicine cavity is respectively provided with a medicine liquid suction inlet and a medicine liquid discharge outlet. The elastic energy storage element in the output hydraulic cylinder can convert the pushing force or the pulling force of hydraulic oil to the piston into return elastic energy storage, the liquid medicine in the medicine cavity is injected into the high-pressure area oil pipe, when the hydraulic pump stops pumping, the piston of the output hydraulic cylinder rapidly resets under the effect of the elastic energy storage element, the medicine injection is immediately stopped, the generated negative pressure enables the liquid medicine to be sucked from the medicine industry suction inlet of the medicine injection hydraulic cylinder, the controlled quantitative medicine feeding and unpowered medicine extraction liquid medicine are realized, and the blockage is avoided.
Description
Technical Field
The invention belongs to the field of oil and gas exploitation, and particularly relates to an underground dosing execution device.
Background
At present, the main dosing modes in the field of oil exploitation comprise a wellhead dosing mode and a downhole dosing mode. The well mouth dosing mode has the problems of serious waste of liquid medicine, rechecking of dosing procedures, low dosing efficiency and the like, and the traditional mechanical underground dosing mode has the problems of difficult quantitative control, short dosing period, easy blockage, short maintenance period and the like.
Therefore, it is desirable to provide a downhole dosing actuator, which can achieve the functions of dosing control and unpowered dosing, and avoid blockage.
Disclosure of Invention
In order to better meet the requirements of oil and gas exploitation, the underground dosing execution device is provided, and the underground controlled quantitative dosing and unpowered dosing functions are convenient to realize.
In order to achieve the above object, the present invention provides a downhole dosing execution device, comprising: the oil compensation mechanism comprises an input hydraulic cylinder and an oil tank connected with an oil inlet of the input hydraulic cylinder;
an oil inlet of the hydraulic pump is connected with an oil outlet of the input hydraulic cylinder;
the hydraulic pump comprises an output hydraulic cylinder, wherein a spring is arranged in the output hydraulic cylinder, one end of the spring is connected with one side surface of a piston in the output hydraulic cylinder, the other end of the spring is connected with the inner wall of the output hydraulic cylinder opposite to the one side surface, and an oil outlet of the hydraulic pump is connected with an oil inlet of the output hydraulic cylinder;
the piston in the medicine injection hydraulic cylinder divides the medicine injection hydraulic cylinder into an oil cavity and a medicine cavity, the oil cavity is connected with the oil outlet of the output hydraulic cylinder, and the medicine cavity is respectively provided with a medicine liquid suction inlet and a medicine liquid discharge outlet.
Preferably, the hydraulic oil compensation device further comprises a bypass throttle valve, one end of the bypass throttle valve is connected with an oil outlet of the hydraulic pump through a pipeline, and the other end of the bypass throttle valve is connected with the oil liquid compensation mechanism through a pipeline.
Preferably, the input hydraulic cylinder comprises a first input hydraulic cylinder and a second input hydraulic cylinder connected in series with an oil outlet of the first input hydraulic cylinder.
Preferably, the output hydraulic cylinder comprises a first output hydraulic cylinder connected with the oil outlet of the hydraulic pump, and a second output hydraulic cylinder connected in series with the oil outlet of the first output hydraulic cylinder, and the spring is arranged in the second output hydraulic cylinder.
Preferably, a piston in the second output hydraulic cylinder divides the second output hydraulic cylinder into a first chamber and a second chamber, the spring is arranged in the first chamber or the second chamber, one end of the spring is connected with the piston of the second output hydraulic cylinder, and the other end of the spring is connected with the inner wall of the second output hydraulic cylinder.
Preferably, the liquid medicine suction inlet is provided with a first check valve group and a liquid medicine box connected with the first check valve group, liquid medicine is contained in the liquid medicine box, and the first check valve group is formed by connecting a plurality of check valves in series.
Preferably, a first filter is arranged between the liquid inlet of the first check valve group and the liquid medicine box.
Preferably, the liquid medicine outlet is provided with a second check valve set, and the second check valve set is formed by connecting a plurality of check valves in series.
Preferably, a second filter is arranged at the liquid outlet of the second check valve group.
Preferably, the hydraulic pump further comprises a motor, wherein the motor is connected with the hydraulic pump and is used for driving the hydraulic pump to rotate.
The invention has the beneficial effects that: hydraulic oil through the hydraulic pump with fluid compensation mechanism injects the output hydraulic cylinder into through the hydraulic pump, the spring in the output hydraulic cylinder can convert the thrust or the pulling force of hydraulic oil to the piston into return elastic energy storage, the output hydraulic cylinder is connected with injection liquid hydraulic cylinder, inject the liquid medicine of medicine intracavity into high-pressure region oil pipe, when the hydraulic pump stops pumping, the piston at the output hydraulic cylinder resets under the effect of spring rapidly, make the injection medicine stop immediately, the negative pressure that produces makes the liquid medicine inhale from the pharmaceutical industry sunction inlet of injection liquid hydraulic cylinder, realize that there is the ration of control to add medicine and unpowered extraction liquid medicine, avoid taking place the jam, working fluid in the hydraulic pump is isolated with the liquid medicine that has the corruption line simultaneously, can guarantee the life of hydraulic pump.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
FIG. 1 shows a schematic structural view of a downhole medicated actuator device according to one embodiment of the invention.
Description of reference numerals:
1. an oil tank; 2. a first input hydraulic cylinder; 3. a second input hydraulic cylinder; 4. a bypass throttle valve; 5. a hydraulic pump; 6. a motor; 7. a first output hydraulic cylinder; 8. a second output hydraulic cylinder; 9. a medicine injection hydraulic cylinder; 10. a second check valve group; 11. a first check valve group; 12. a first filter; 13. a liquid medicine box; 14. a spring; 81. a first chamber; 82. a second chamber; 91. an oil chamber; 92. a medicine cavity.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
According to the embodiment of the invention, the underground dosing execution device comprises:
the oil compensation mechanism comprises an input hydraulic cylinder and an oil tank connected with an oil inlet of the input hydraulic cylinder; an oil inlet of the hydraulic pump is connected with an oil outlet of the input hydraulic cylinder; the hydraulic pump comprises an output hydraulic cylinder, wherein a spring is arranged in the output hydraulic cylinder, one end of the spring is connected with one side surface of a piston in the output hydraulic cylinder, the other end of the spring is connected with the inner wall of the output hydraulic cylinder opposite to one side surface, and an oil outlet of the hydraulic pump is connected with an oil inlet of the output hydraulic cylinder; the piston in the medicine injection hydraulic cylinder divides the medicine injection hydraulic cylinder into an oil cavity and a medicine cavity, the oil cavity is connected with an oil outlet of the output hydraulic cylinder, and the medicine cavity is respectively provided with a medicine liquid suction inlet and a medicine liquid discharge outlet.
When medicine adding work is executed, the hydraulic pump operates, hydraulic oil in the oil tank is sucked from the oil liquid compensation mechanism and is converted into high pressure, the high-pressure hydraulic oil enters the output hydraulic cylinder from the oil outlet of the hydraulic pump and pushes the piston to move, a spring in the output hydraulic cylinder can convert the pushing force or the pulling force of the hydraulic oil on the piston into return elastic energy storage, the hydraulic oil is extruded into the oil cavity of the medicine injection hydraulic cylinder from the oil outlet of the output hydraulic cylinder, the piston of the medicine injection hydraulic cylinder is pushed to inject medicine liquid in the medicine cavity into the high-pressure area of the oil pipe from the medicine liquid outlet, and therefore the function of medicine liquid injection is completed.
When the system is powered off and stops running, the piston of the output hydraulic cylinder resets under the action of the spring to extrude hydraulic oil back into the hydraulic pump, the hydraulic pump rotates reversely, the piston of the liquid medicine injection hydraulic cylinder is driven to move back by the generated negative pressure due to the reset of the piston of the output oil cylinder, and liquid medicine enters the medicine cavity of the liquid medicine injection hydraulic cylinder from the medicine suction port, so that the function of sucking the liquid medicine is completed. Preferably, the hydraulic pump further comprises a motor, and the motor is connected with the hydraulic pump and is used for driving the hydraulic pump to rotate.
Preferably, the hydraulic pump further comprises a motor, and the motor is connected with the hydraulic pump and is used for driving the hydraulic pump to rotate.
Preferably, the hydraulic pump further comprises a speed reducer, and the speed reducer is arranged between the motor and the hydraulic pump.
Specifically, when the execution device is electrified to work, the motor rotates according to a set rotating speed, the hydraulic pump is driven, if the motor driving torque capacity can not meet the working requirement of the hydraulic pump, the speed reducer is additionally arranged between the motor and the hydraulic pump, the motor driving torque is increased, and therefore the hydraulic pump can overcome resistance to operation.
As a preferred scheme, the hydraulic oil compensating device further comprises a bypass throttle valve, one end of the bypass throttle valve is connected with an oil outlet of the hydraulic pump through a pipeline, and the other end of the bypass throttle valve is connected with the oil liquid compensating mechanism through a pipeline.
Specifically, an oil outlet of the hydraulic pump is communicated with a bypass throttle valve and an output hydraulic cylinder, a small part of oil flows back to a low-pressure cavity of the hydraulic pump through the bypass throttle valve, and a large part of hydraulic oil enters the output hydraulic cylinder to push a piston to move. When the hydraulic pump stops operating, the elastic energy storage of the piston in the output hydraulic cylinder is released, so that the piston in the output hydraulic cylinder is reset, and the hydraulic oil is discharged back to the oil compensation mechanism through the bypass throttle valve.
The hydraulic pump operates to suck the hydraulic oil from the oil compensation mechanism to convert the hydraulic oil into high pressure, the piston of the input hydraulic cylinder automatically moves to compensate the oil, a small part of the hydraulic oil flows into the low-pressure pipeline of the bypass throttle valve, and a large part of the hydraulic oil enters the output oil cylinder to push the piston to move so as to push the piston of the medicine injection hydraulic cylinder to move.
When the system is powered off and stops running, the piston of the output oil cylinder is reset under the action of the spring, one part of hydraulic oil is squeezed back to the hydraulic pump, and the other part of hydraulic oil is discharged back to the oil compensation mechanism through the bypass throttle valve.
Preferably, the input hydraulic cylinder comprises a first input hydraulic cylinder and a second input hydraulic cylinder connected with an oil outlet of the first input hydraulic cylinder in series.
Specifically, the second input hydraulic cylinder is communicated with an oil inlet of the hydraulic pump to provide oil required by the pump oil for the hydraulic pump. When the liquid at the joint of the second input hydraulic cylinder and the oil inlet of the hydraulic pump is reduced, the piston of the second input hydraulic cylinder and the piston of the first input hydraulic cylinder both move adaptively to compensate the oil loss.
As the preferred scheme, the output hydraulic cylinder comprises a first output hydraulic cylinder connected with the oil outlet of the hydraulic pump and a second output hydraulic cylinder connected with the oil outlet of the first output hydraulic cylinder in series, the spring is arranged in the second output hydraulic cylinder, the two stages of hydraulic cylinders are connected in series, and pumped hydraulic oil pushes the piston of the first output hydraulic cylinder and the piston of the second output hydraulic cylinder to move step by step, so that the liquid medicine is favorably injected into a high-pressure area of the oil pipe.
Preferably, the piston in the second output hydraulic cylinder divides the second output hydraulic cylinder into a first chamber and a second chamber, the spring is arranged in the first chamber or the second chamber, one end of the spring is connected with the piston of the second output hydraulic cylinder, and the other end of the spring is connected with the inner wall of the second output hydraulic cylinder.
As an example, the spring is a spring, the spring is arranged in a second chamber of the second output hydraulic cylinder, hydraulic oil enters the first chamber of the second output hydraulic cylinder to push the piston to move towards the second chamber, the spring in the second chamber is compressed to store energy, the second chamber pushes the hydraulic oil into an oil cavity of the medicine injection hydraulic cylinder, the piston moves towards the medicine cavity of the medicine injection hydraulic cylinder, and medicine liquid is injected into a high-pressure area of the oil pipe.
As an example, when the hydraulic pump stops operating, the second output hydraulic cylinder pushes the piston to reset under the action of the spring, the oil is squeezed back into the first output hydraulic cylinder, and the hydraulic oil in the first output hydraulic cylinder is discharged back to the oil compensation mechanism through the bypass throttle valve. At the moment, the piston of the second output hydraulic cylinder is reset, the generated negative pressure drives the piston of the liquid medicine injection hydraulic cylinder to move back, and liquid medicine in the liquid medicine box enters the liquid medicine cavity from the liquid medicine suction inlet, so that the function of sucking the liquid medicine is completed.
Preferably, the liquid medicine suction inlet is provided with a first check valve group and a liquid medicine box connected with the first check valve group, liquid medicine is contained in the liquid medicine box, and the first check valve group is formed by connecting a plurality of check valves in series.
As an example, the first check valve group consists of three groups of check valves connected in series, is made of anti-corrosion materials, and is designed redundantly by connecting three valves in series, so that the reliability of the liquid inlet of the system is improved.
As an example, the dosing execution device is arranged in an annular space of a downhole oil sleeve, the annular space of the oil sleeve is filled with liquid medicine (PH: 7-10 or 1-4), and the annular space of the oil sleeve is a liquid medicine box. The oil pipe contains oil-gas mixed fluid, the oil is crude oil and has corrosiveness, and the mixed fluid contains a small amount of carbon dioxide and hydrogen sulfide.
As an example, the device further comprises an electronic control unit, the hydraulic pump is controlled by the electronic control unit to operate, and the liquid medicine in the annular space of the oil sleeve is injected into the oil pipe through the medicine adding execution device.
As preferred scheme, be equipped with first filter between the inlet of first check valve group and the liquid medicine case.
Particularly, the liquid medicine entering the medicine cavity of the injection hydraulic cylinder is filtered, so that the filtering precision of the liquid medicine entering the medicine cavity is guaranteed, and components and parts at the position of a liquid medicine suction port are prevented from being blocked.
Preferably, the liquid medicine outlet is provided with a second check valve group, and the second check valve group is formed by connecting a plurality of check valves in series.
As a preferred scheme, the second check valve group is also composed of three groups of check valves connected in series, is made of anti-corrosion materials, and improves the reliability of components at the liquid medicine discharge port by utilizing the triple valve series redundancy design.
As preferred scheme, the liquid outlet of second check valve group is equipped with the second filter. The rear end of the second check valve group is provided with a filter to prevent the second check valve group from being blocked by liquid flowing backwards.
Examples
FIG. 1 shows a schematic structural view of a downhole medicated actuator device according to one embodiment of the invention. As shown in fig. 1, an embodiment provides a downhole medicated implement device, comprising:
the oil compensation mechanism comprises an input hydraulic cylinder and an oil tank 1 connected with an oil inlet of the input hydraulic cylinder, and the input hydraulic cylinder comprises a first input hydraulic cylinder 2 and a second input hydraulic cylinder 3 connected with an oil outlet of the first input hydraulic cylinder 2 in series; an oil inlet of the hydraulic pump 5 is connected with an oil outlet of the second input hydraulic cylinder 2; the output hydraulic cylinder comprises a first output hydraulic cylinder 7 connected with the oil outlet of the hydraulic pump 5 and a second output hydraulic cylinder 8 connected with the oil outlet of the first output hydraulic cylinder 7 in series, a spring 14 is arranged in the second output hydraulic cylinder 8, a piston of the second output hydraulic cylinder 8 divides the second output hydraulic cylinder into a first cavity 81 and a second cavity 82, the spring 14 is arranged in the second cavity 82, one end of the spring 14 is connected with the piston of the second output hydraulic cylinder 8, and the other end of the spring is connected with the inner wall of the second output hydraulic cylinder 8.
And the piston in the liquid medicine injection hydraulic cylinder 9 divides the liquid medicine injection hydraulic cylinder 9 into an oil cavity 91 and a medicine cavity 92, the oil cavity 91 is connected with an oil outlet of the second output hydraulic cylinder 8, and the medicine cavity 92 is respectively provided with a liquid medicine suction inlet and a liquid medicine discharge outlet. The liquid medicine suction inlet is provided with a first check valve group 11 and a liquid medicine box 13 connected with the first check valve group 11, liquid medicine is contained in the liquid medicine box 13, and the first check valve group 11 is formed by connecting a plurality of check valves in series. A first filter 12 is arranged between the liquid inlet of the first check valve group 11 and the liquid medicine box 13. The liquid medicine outlet is provided with a second check valve group 10, and the second check valve group 10 is formed by connecting a plurality of check valves in series. The outlet of the second check valve group 10 is provided with a second filter (not shown).
Still include bypass throttle valve 4, the one end of bypass throttle valve 4 is passed through the pipeline and is connected with the oil-out of hydraulic pump 5, and the other end of bypass throttle valve 4 passes through the pipeline and is connected with fluid compensation mechanism. The hydraulic pump further comprises a motor 6, and the motor 6 is connected with the hydraulic pump 5 and used for driving the hydraulic pump 6 to rotate.
When the system works, the motor 6 drives the hydraulic pump 5 to operate, hydraulic oil is sucked from the second input hydraulic cylinder 3 and is converted into high pressure, at the moment, the piston of the first input hydraulic cylinder 2 automatically moves to compensate oil, a small part of hydraulic oil flows from a low-pressure pipeline of the bypass throttle valve 4, most of hydraulic oil enters the first output hydraulic cylinder 7 to push the piston to move, and then the piston of the second output hydraulic cylinder 8 is pushed to move, so that the spring 14 is compressed to store elastic potential energy, the oil extruded by the piston of the second output hydraulic cylinder 8 pushes the piston of the liquid medicine injection hydraulic cylinder 9 to move, liquid medicine is discharged outwards through the second check valve group 10 and the second filter at the liquid medicine discharge port, and the liquid medicine enters a high-pressure area of the oil pipe, so that the function of liquid medicine injection is completed.
When the hydraulic pump 5 stops operating, the piston of the second output hydraulic cylinder 8 resets under the release of elastic potential energy of the spring 14, so that the injection is immediately stopped, oil is squeezed back into the first output hydraulic cylinder 7, and the oil in the first output hydraulic cylinder 7 is discharged back into the oil compensation mechanism through the bypass throttle valve 4. Because the 8 pistons of the second output hydraulic cylinders are reset, the generated negative pressure drives the pistons of the liquid medicine injection hydraulic cylinders 9 to move back, the first valve group 11 of the liquid medicine suction inlet is opened at the moment, liquid medicine enters the liquid medicine injection hydraulic cylinders 9 from the liquid medicine tank, the function of sucking the liquid medicine is completed, and controlled quantitative medicine adding and unpowered liquid medicine extraction are achieved.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (7)
1. A downhole dosing actuator, comprising:
the oil compensation mechanism comprises an input hydraulic cylinder and an oil tank connected with an oil inlet of the input hydraulic cylinder;
an oil inlet of the hydraulic pump is connected with an oil outlet of the input hydraulic cylinder;
the hydraulic pump comprises an output hydraulic cylinder, wherein a spring is arranged in the output hydraulic cylinder, one end of the spring is connected with one side surface of a piston in the output hydraulic cylinder, the other end of the spring is connected with the inner wall of the output hydraulic cylinder opposite to the one side surface, and an oil outlet of the hydraulic pump is connected with an oil inlet of the output hydraulic cylinder;
the piston in the medicine injection hydraulic cylinder divides the medicine injection hydraulic cylinder into an oil cavity and a medicine cavity, the oil cavity is connected with the oil outlet of the output hydraulic cylinder, and the medicine cavity is respectively provided with a medicine liquid suction inlet and a medicine liquid discharge outlet;
the hydraulic pump oil-liquid compensation device is characterized by further comprising a bypass throttle valve, wherein one end of the bypass throttle valve is connected with an oil outlet of the hydraulic pump through a pipeline, and the other end of the bypass throttle valve is connected with the oil-liquid compensation mechanism through a pipeline;
the input hydraulic cylinder comprises a first input hydraulic cylinder and a second input hydraulic cylinder connected with an oil outlet of the first input hydraulic cylinder in series;
the output hydraulic cylinder comprises a first output hydraulic cylinder connected with the oil outlet of the hydraulic pump and a second output hydraulic cylinder connected with the oil outlet of the first output hydraulic cylinder in series, and the spring is arranged in the second output hydraulic cylinder.
2. The downhole dosing execution device according to claim 1, wherein a piston in the second output hydraulic cylinder divides the second output hydraulic cylinder into a first chamber and a second chamber, the spring is arranged in the first chamber or the second chamber, one end of the spring is connected with the piston of the second output hydraulic cylinder, and the other end of the spring is connected with the inner wall of the second output hydraulic cylinder.
3. The downhole dosing execution device according to claim 1, wherein the liquid medicine suction inlet is provided with a first check valve group and a liquid medicine tank connected with the first check valve group, liquid medicine is contained in the liquid medicine tank, and the first check valve group is formed by connecting a plurality of check valves in series.
4. The downhole dosing execution device according to claim 3, wherein a first filter is arranged between the liquid inlet of the first check valve set and the liquid medicine tank.
5. The downhole dosing actuator of claim 1, wherein the medical fluid outlet is provided with a second check valve set, and the second check valve set is formed by connecting a plurality of check valves in series.
6. The downhole medicating actuator of claim 5, wherein the outlet port of the second one-way valve set is provided with a second filter.
7. The downhole dosing actuator of claim 1, further comprising a motor coupled to the hydraulic pump for driving the hydraulic pump to rotate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910491690.8A CN110080733B (en) | 2019-06-06 | 2019-06-06 | Underground dosing execution device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910491690.8A CN110080733B (en) | 2019-06-06 | 2019-06-06 | Underground dosing execution device |
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| CN110080733B true CN110080733B (en) | 2021-11-23 |
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| Publication number | Publication date |
|---|---|
| CN110080733A (en) | 2019-08-02 |
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