WO2022193331A1 - 一种电缸驱动装置及含有该驱动装置的游梁式抽油机 - Google Patents

一种电缸驱动装置及含有该驱动装置的游梁式抽油机 Download PDF

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Publication number
WO2022193331A1
WO2022193331A1 PCT/CN2021/081961 CN2021081961W WO2022193331A1 WO 2022193331 A1 WO2022193331 A1 WO 2022193331A1 CN 2021081961 W CN2021081961 W CN 2021081961W WO 2022193331 A1 WO2022193331 A1 WO 2022193331A1
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Prior art keywords
electric cylinder
oil
pumping unit
driving device
ball screw
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PCT/CN2021/081961
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English (en)
French (fr)
Inventor
徐建新
曾大勇
李勇
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上海樱洛机电科技有限公司
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Publication of WO2022193331A1 publication Critical patent/WO2022193331A1/zh
Priority to US18/529,088 priority Critical patent/US20240110560A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F04B47/02—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level
    • F04B47/022—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level driving of the walking beam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids
    • E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
    • E21B43/127—Adaptations of walking-beam pump systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F04B47/02—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level
    • F04B47/028—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level details of the walking beam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N13/00—Lubricating-pumps
    • F16N13/02—Lubricating-pumps with reciprocating piston
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N13/00—Lubricating-pumps
    • F16N13/02—Lubricating-pumps with reciprocating piston
    • F16N13/06—Actuation of lubricating-pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N31/00—Means for collecting, retaining, or draining-off lubricant in or on machines or apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N13/00—Lubricating-pumps
    • F16N13/02—Lubricating-pumps with reciprocating piston
    • F16N13/06—Actuation of lubricating-pumps
    • F16N2013/063—Actuation of lubricating-pumps with electrical drive

Definitions

  • the invention relates to the field of petroleum equipment, in particular to an electric cylinder driving device and a beam pumping unit containing the driving device.
  • the electric cylinder-driven beam-type pumping unit used in the oil field includes the pumping unit base, the pumping unit bracket, the pumping unit donkey head, the pumping unit beam, the driving electric cylinder, the counterweight and other structures. Provide power for the pumping unit donkey head to swing up and down.
  • the traditional electric drive cylinder is used in the vertical direction, it is easy to cause the oil leakage to the outside of the equipment.
  • the equipment is required to have good sealing performance.
  • Existing electric cylinders such as the invention patent with the application number of 201810655255.X, disclose a servo motor-driven beam pumping unit, and the servo electric cylinder driving device includes a servo motor, a ball screw, an outer casing, and an inner casing.
  • the ball screw is connected with the servo motor by a coupling, the outer sleeve is sleeved outside the inner sleeve, the inner sleeve is provided with a ball nut, and the ball nut is screwed into the ball screw; the inner sleeve and the outer sleeve are For clearance fit, there is a certain distance between the outer wall of the inner sleeve and the inner wall of the outer sleeve, so that the two can be nested and the outer sleeve can slide relative to the inner sleeve to realize the lifting and lowering of the outer sleeve along the outer wall of the inner sleeve.
  • the ball screw is provided with a bearing, and the bearing is fixed on the bearing seat located on the inner wall of the outer casing. When the servo motor drives the ball screw to rotate to lift or lower, the bearing drives the outer casing to lift or lower.
  • the lubricating oil in the oil pool in the inner casing is pumped to the bearing by the oil pump. After lubricating and cooling the bearing, the lubricating oil flows down the ball screw. Outside of the drive axis.
  • the present invention provides an electric cylinder driving device and a beam-type pumping unit containing the driving device, which can reduce the leakage of lubricating oil in the electric cylinder and prevent the leakage of lubricating oil in the electric cylinder.
  • the leaked lubricating oil is collected, and the technical purpose of the present invention is achieved through the following technical solutions:
  • An electric cylinder driving device includes an electric cylinder outer tube, an electric cylinder inner tube, a ball screw, an electric cylinder piston, and a ball screw nut.
  • the electric cylinder outer tube is sleeved on the outside of the electric cylinder inner tube, and the ball screw nut is installed on Inside the upper end of the inner tube of the electric cylinder, one end of the ball screw is movably connected in the outer tube of the electric cylinder, and the other end of the roller screw is inserted into the inner tube of the electric cylinder with the ball screw nut; between the outer tube of the electric cylinder and the inner tube of the electric cylinder, there is also a
  • the electric cylinder piston, the electric cylinder piston is fixed outside the upper end of the electric cylinder inner pipe; the lower end of the electric cylinder inner pipe is provided with an oil pool; the outer part of the electric cylinder piston is provided with an elastic oil scraping device, and the elastic oil scraping device is arranged on the electric cylinder piston and the electric cylinder between the inner walls of the outer tube.
  • an oil collecting device is also provided at the bottom of the outer tube of the electric cylinder.
  • the elastic oil scraping device includes an oil scraping ring, an annular groove is provided outside the piston of the electric cylinder, the oil scraping ring is installed in the annular groove, and the oil scraping ring is fitted to the inner wall of the outer tube of the electric cylinder.
  • the electric cylinder piston is also provided with an oil return groove, which runs through the inner and outer sides of the electric cylinder piston.
  • the inner pipe of the electric cylinder is also provided with an oil return hole corresponding to the oil return groove, and the oil return groove communicates with the oil pool through the oil return hole; The upper end of the annular groove.
  • the oil return groove is arranged obliquely, and one end of the oil return groove located on the outer side of the electric cylinder piston is higher than the end of the oil return groove connected to the oil return hole.
  • the oil scraping device further includes an elastic O-ring, the elastic O-ring is installed in the annular groove, and the oil-scraping ring is sleeved outside the elastic O-ring.
  • the oil collecting device includes an oil receiving pan and an oil collecting pot.
  • the oil receiving pan is installed at the lower end of the outer tube of the electric cylinder, and an annular hole and an oil collecting groove are arranged inside the oil receiving plate.
  • the pipe gap passes through the annular hole; the oil collecting tank is coaxially arranged outside the annular hole, the oil collecting pot is installed on one side of the lower end of the oil receiving plate, and the oil collecting groove is connected with the oil collecting pot.
  • the oil collecting pot is a vacuum pump filter.
  • the upper end surface of the annular hole is provided with an annular groove, and the side of the annular groove close to the inner tube of the electric cylinder is higher than the side of the annular groove close to the oil collecting tank.
  • a beam-type pumping unit the aforementioned electric cylinder drive device is applied to the pumping unit, including a base, a pumping unit bracket, a pumping unit donkey head, a pumping unit beam, an electric cylinder drive device, and a counterweight
  • the pumping unit bracket is installed at the upper end of the base
  • the pumping unit bracket is installed at the lower end of the middle of the pumping unit beam
  • the pumping unit donkey head is installed at one end of the pumping unit beam
  • the counterweight is installed at the other end of the pumping unit beam.
  • the electric cylinder driving device is connected between the beam of the pumping unit and the base, and the driving device of the electric cylinder drives the donkey head of the pumping unit at one end of the beam of the pumping unit to move up and down.
  • the electric cylinder driving device of the present invention can reduce or even avoid the problem of the leakage of lubricating oil from the inner wall of the outer tube of the electric cylinder by means of the dual measures of the elastic oil scraping device and the oil collecting device;
  • the oil scraping ring will be worn during use, and the setting of the elastic O-ring can compensate the worn part of the oil scraping ring and prolong the service life.
  • the oil scraping ring can intercept the lubricating oil flowing between the piston of the electric cylinder and the inner wall of the outer tube of the electric cylinder, and the intercepted lubricating oil flows from the oil return groove through the oil return hole and finally returns to the oil pool, preventing the lubricating oil from being discharged from the electric cylinder. Leakage between the cylinder piston and the outer tube of the electric cylinder;
  • the setting of the oil receiving pan and the oil collecting pot can further ensure that the lubricating oil that may leak from the electric cylinder piston and the electric cylinder outer pipe is collected, and further plays the role of preventing leakage.
  • Figure 1 is a schematic diagram of the structure of a traditional electric cylinder.
  • FIG. 2 is a schematic structural diagram of the sealing system of the electric cylinder-driven beam pumping unit in the present invention.
  • FIG. 3 is an enlarged view of the elastic oil scraping device in FIG. 2 .
  • FIG. 4 is a schematic structural diagram of the oil collecting device in the present invention.
  • FIG. 5 is a schematic diagram of the structure of the oil receiving pan in the present invention.
  • FIG. 6 is a schematic structural diagram of the beam pumping unit in the present invention.
  • the existing electric cylinder structure is shown in Figure 1, including electric cylinder outer tube 1, electric cylinder inner tube 2, ball screw 3, electric cylinder piston 4, ball screw nut 5, electric cylinder outer tube 1 is sleeved on the electric cylinder.
  • the ball screw nut 5 On the outside of the cylinder inner tube 2, the ball screw nut 5 is installed inside the upper end of the electric cylinder inner tube 2, and the upper end of the ball screw 3 is connected with the motor at the upper end of the electric cylinder outer tube 1.
  • the motor drives the ball screw 3 to rotate
  • a bearing 6 is arranged inside the outer tube 1 of the electric cylinder, and the ball screw 3 is connected to the outer tube 1 of the electric cylinder through the bearing 6; the lower end of the ball screw 3 is installed with the ball screw nut 5; 4.
  • the electric cylinder piston 4 is placed between the electric cylinder outer tube 1 and the electric cylinder inner tube 2.
  • the motor drives the ball screw 3 to rotate and then the ball screw 3 rotates relative to the ball screw nut 5, thereby driving the electric cylinder outer tube 1 to rotate relative to the ball screw nut 5.
  • the electric cylinder piston 4 moves up and down; an oil pool 7 is provided at the bottom end of the inner tube 2 of the electric cylinder, and the lubricating oil in the oil pool 7 is pumped to the bearing 6 by the oil pump for cooling and lubrication. A part of the lubricating oil flows back to the oil pool 7 along the ball screw 3 , and another part of the lubricating oil leaks from between the electric cylinder piston 4 and the inner wall of the electric cylinder outer tube 1 .
  • the present invention provides an electric cylinder drive device.
  • an elastic oil scraping device is installed outside the electric cylinder piston 4, and the leakage to the electric cylinder piston 4 and the electric cylinder piston 4 and The lubricating oil between the inner walls of the outer tube 1 of the electric cylinder is intercepted to prevent it from leaking to the outside of the outer tube of the electric cylinder; it is unavoidable that some lubricating oil will still leak from the elastic oil scraping device, so it is still in the outer tube of the electric cylinder.
  • An oil collecting device is installed at the bottom of 1 to recycle part of the leaked lubricating oil.
  • the elastic oil scraping device includes an oil scraping ring 8, which is made of polytetrafluoroethylene mixed with copper powder.
  • An annular groove 9 is provided outside the piston of the electric cylinder, and the oil scraping ring 8 is installed in the annular groove 9. Make the oil scraper ring 8 abut against the inner wall of the electric cylinder outer pipe 1 , and intercept the lubricating oil leaking between the electric cylinder piston 4 and the inner wall of the electric cylinder outer pipe 1 by placing the oil scraping ring 8 .
  • an oil return groove 10 is also provided on the electric cylinder piston 4, and the oil return groove 10 is located at the upper end of the annular groove 9;
  • the inner tube 2 of the electric cylinder is also provided with oil return holes 11 corresponding to the oil return groove 10 , and the intercepted lubricating oil flows from the oil return groove 10 to the oil return hole 11 and then returns to the oil pool 7 .
  • the oil return groove 10 may also be inclined, and one end of the oil return groove 10 connected to the oil return hole 11 is in a low position.
  • an elastic O-ring 12 is also installed in the annular groove 9.
  • the elastic O-ring 12 is made of silicone rubber.
  • the oil scraping ring 8 is sleeved on the outside of the elastic O-ring 12. Once the oil scraping ring 8 is worn under the elastic force of the elastic O-ring 12, it will make up for the worn part of the oil scraping ring 8 and prolong the service life.
  • the oil collecting device includes an oil receiving pan 13 and an oil collecting pot 14.
  • the oil receiving pan 13 is installed on the lower end of the outer tube 1 of the electric cylinder.
  • the oil receiving pan 13 is provided with an annular hole 15 and an oil collecting groove 16.
  • the annular hole 15 is provided with In the middle of the oil receiving pan 13, the inner tube 2 of the electric cylinder passes through the annular hole 15; the oil collecting groove 16 is coaxially arranged on the outer side of the annular hole 15;
  • the oil tank 16 is connected to the oil collecting pot 14, and the oil collecting pot is a vacuum pump filter, the model of which is the vacuum pump filter produced by Wenzhou Lanxing Electromechanical Equipment Co., Ltd.
  • the oil receiving pan 13 will move up and down relative to the outer wall of the electric cylinder inner pipe 2 during use, that is, the inner wall of the annular hole 15 moves against the outer wall of the electric cylinder inner pipe 2.
  • the lubricating oil leaked between the inner wall of the outer tube 1 of the electric cylinder is collected into the oil collecting tank 16, the annular groove 17 is provided on the upper end surface of the annular hole 15, and the side of the annular groove 17 close to the inner tube of the electric cylinder is higher than the annular groove 17.
  • the lubricating oil flows into the oil collecting tank 16 along the annular groove 17 and is finally recovered into the oil collecting pot 14 .
  • the electric cylinder driving device is applied to the beam pumping unit, as shown in Figure 6, including the base 18, the pumping unit bracket 19, the pumping unit donkey head 20, the pumping unit beam 21, and the electric cylinder driving device 22.
  • Counterweight 23 the pumping unit bracket 19 is installed on the upper end of the base 18, the pumping unit bracket 19 is installed on the lower end of the middle part of the pumping unit beam 21, and the pumping unit donkey head 20 is installed at one end of the pumping unit beam 21 , the counterweight 23 is installed on the other end of the pumping unit beam 21, the electric cylinder driving device 22 is connected between the pumping unit beam 21 and the base 18, and the electric cylinder driving device 22 drives the pumping unit at one end of the pumping unit beam 21 The oil machine donkey head 20 moves up and down.

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Abstract

一种电缸驱动装置（22）及含有该电缸驱动装置（22）的游梁式抽油机，电缸驱动装置（22）包括电缸外管（1）、电缸内管（2）、滚珠丝杠（3）、电缸活塞（4）、滚珠丝杠螺母（5），电缸外管（1）套设在电缸内管（2）外侧，滚珠丝杠螺母（5）安装在电缸内管（2）上端内部，滚珠丝杠（3）一端活动连接在电缸外管（1）内，滚珠丝杠（3）另外一端配合滚珠丝杠螺母（5）插入电缸内管（2）内；电缸外管（1）和电缸内管（2）之间还设有电缸活塞（4），电缸活塞（4）固定在电缸内管（2）上端外部；电缸内管（2）下端内部设有油池（7）；电缸活塞（4）外部安装有弹性刮油装置，弹性刮油装置设置在电缸活塞（4）和电缸外管（1）内壁之间。通过弹性刮油装置的设置将流向电缸活塞（4）和电缸外管（1）内壁之间的润滑油截住，避免润滑油从电缸活塞（4）和电缸外管（1）之间泄漏。

Description

一种电缸驱动装置及含有该驱动装置的游梁式抽油机 技术领域
本发明涉及石油设备领域，具体涉及一种电缸驱动装置及含有该驱动装置的游梁式抽油机。
背景技术
应用在油田中的电缸驱动游梁式抽油机包括抽油机底座、抽油机支架、抽油机驴头、抽油机游梁、驱动电缸、配重等结构，借助驱动电缸为抽油机驴头上下摆动提供动力。传统的驱动电缸在竖直方向应用时，很容易造成润滑油泄漏到设备外部，对于油田而言，要求设备具有良好的密封性。
现有的驱动电缸如申请号为201810655255.X的发明专利公开了一种伺服电机驱动游梁式抽油机，其伺服电缸驱动装置包括伺服电机、滚珠丝杠、外套管、内套管、滚珠螺母，滚珠丝杠采用联轴器与伺服电机连接，外套管套设在内套管外，内套管上设有滚珠螺母，滚珠螺母旋入滚珠丝杠上；内套管和外套管间隙配合，内套管的外壁和外套管的内壁之间间隔一定距离，使得两者可嵌套并使外套管在内套管上相对滑动来实现外套管沿着内套管外壁升降。在滚珠丝杠上设有轴承，轴承固定在位于外套管内壁上的轴承座上，当伺服电机带动滚珠丝杠旋转提升或下降时，轴承带动外套管提升或下降。
为了实现润滑和散热的要求，必须采用循环润滑油的方式才能实现润滑和散热的要求。
现有技术通过油泵将内套管内油池内的润滑油泵至轴承处，润滑油润滑并冷却轴承后顺着滚珠丝杠向下流动，一部分流回油池，另外一部分流到外套管内壁后泄漏到驱动电缸的外部。
发明内容
为了减少、避免驱动电缸内的润滑油泄漏到驱动电缸外部，本发明提供了一种电缸驱动装置及含有该驱动装置的游梁式抽油机，减少电缸 内润滑油泄漏并对泄漏的润滑油进行收集，本发明的技术目的是通过以下技术方案实现的：
一种电缸驱动装置，包括电缸外管、电缸内管、滚珠丝杠、电缸活塞、滚珠丝杠螺母，电缸外管套设在电缸内管外侧，滚珠丝杠螺母安装在电缸内管上端内部，滚珠丝杠一端活动连接在电缸外管内，滚柱丝杠另外一端配合滚珠丝杠螺母插入电缸内管内；电缸外管和电缸内管之间还设有电缸活塞，电缸活塞固定在电缸内管上端外部；电缸内管下端内部设有油池；电缸活塞外部安装有弹性刮油装置，弹性刮油装置设置在电缸活塞和电缸外管内壁之间。
进一步地，电缸外管底部还设有集油装置。
进一步地，弹性刮油装置包括刮油环，电缸活塞外部设有环形槽，刮油环安装在环形槽内，刮油环贴合电缸外管内壁。
进一步地，电缸活塞上还设有回油槽，回油槽贯穿电缸活塞内外两侧，电缸内管对应回油槽还设有回油孔，回油槽通过回油孔连通油池；回油槽位于环形槽上端。
进一步地，回油槽倾斜设置，回油槽位于电缸活塞外侧一端高于回油槽连通回油孔的一端。
进一步地，刮油装置还包括弹性O型圈，弹性O型圈安装在环形槽内，刮油环套设在弹性O型环外部。
进一步地，集油装置包括接油盘、集油壶，接油盘安装在电缸外管下端，接油盘内部设有环形孔、集油槽，环形孔设置在接油盘中部，电缸内管间隙穿过环形孔；集油槽同轴心设置在环形孔外侧，集油壶安装在接油盘下端一侧，集油槽连通集油壶。
进一步地，集油壶为真空泵过滤器。
进一步地，环形孔上端面设有环形坡口，环形坡口靠近电缸内管的一侧高于环形坡口靠近集油槽的一侧。
一种游梁式抽油机，将前述的电缸驱动装置应用在抽油机中，包括底座、抽油机支架、抽油机驴头、抽油机游梁、电缸驱动装置、配重， 抽油机支架安装在底座上端，抽油机支架安装在抽油机游梁中部下端，抽油机驴头安装在抽油机游梁一端，配重安装在抽油机游梁另外一端，电缸驱动装置连接在抽油机游梁和底座之间，电缸驱动装置驱动抽油机游梁一端的抽油机驴头上下移动。
相比现有技术，本发明的有益效果在于：
1、本发明的电缸驱动装置，借助弹性刮油装置和集油装置双重措施，可以减少甚至避免润滑油从电缸外管内壁泄漏的问题；
2、刮油环在使用过程中会磨损，弹性O型环的设置可以补偿刮油环被磨损部分，延长使用寿命。
3、刮油环可以将流向电缸活塞和电缸外管内壁之间的润滑油截住，截住后的润滑油从回油槽流经回油孔最终回到油池，避免润滑油从电缸活塞和电缸外管之间泄漏；
4、接油盘和集油壶的设置可以进一步保证可能从电缸活塞和电缸外管之间泄漏的润滑油进行收集，进一步起到防泄漏的作用。
附图说明
图1是传统电缸结构示意图。
图2是本发明中的电缸驱动游梁式抽油机密封系统结构示意图。
图3是图2中弹性刮油装置放大图。
图4是本发明中集油装置结构示意图。
图5是本发明中接油盘结构示意图。
图6是本发明中的游梁式抽油机结构示意图。
图中，1、电缸外管；2、电缸内管；3、滚珠丝杠；4、电缸活塞；5、滚珠丝杠螺母；6、轴承；7、油池；8、刮油环；9、环形槽；10、回油槽；11、回油孔；12、弹性O型圈；13、接油盘；14、集油壶；15、环形孔；16、集油槽；17、环形坡口；18、底座；19、抽油机支架；20、抽油机驴头；21、抽油机游梁；22、电缸驱动装置；23、配重。
具体实施方式
下面结合具体实施方式对本发明的技术方案进行进一步描述：
现有的电缸结构如图1所示，包括电缸外管1、电缸内管2、滚珠丝杠3、电缸活塞4、滚珠丝杠螺母5，电缸外管1套设在电缸内管2的外侧，滚珠丝杠螺母5安装在电缸内管2的上端内部，滚珠丝杠3的上端与电缸外管1上端的电机传动连接，通过电机驱动滚珠丝杠3转动，在电缸外管1内部设置轴承6，滚珠丝杠3通过轴承6与电缸外管1连接；滚珠丝杠3下端配合滚珠丝杠螺母5安装；电缸内管2上端外部安装电缸活塞4，电缸活塞4置于电缸外管1和电缸内管2之间，电机带动滚珠丝杠3转动进而滚珠丝杠3相对滚珠丝杠螺母5转动，进而带动电缸外管1相对电缸活塞4上下移动；在电缸内管2内部的底端设有油池7，通过油泵将油池7内的润滑油泵至轴承6处进行降温、润滑。一部分润滑油沿着滚珠丝杠3流回到油池7，另外还有一部分润滑油从电缸活塞4和电缸外管1内壁之间泄漏。
为了解决该问题，本发明提供了一种电缸驱动装置，如图2-5所示，在电缸活塞4的外部安装弹性刮油装置，通过弹性刮油装置将泄漏至电缸活塞4和电缸外管1内壁之间的润滑油截住，避免其泄漏到电缸外管外部；不可避免的可能会存在部分润滑油仍旧会从弹性刮油装置处泄漏，因此还在电缸外管1的底部安装了集油装置，对泄漏的部分润滑油进行回收利用。
具体的，弹性刮油装置包括刮油环8，刮油环8为聚四氟乙烯混合铜粉制成，在电缸活塞外部设置环形槽9，将刮油环8安装在环形槽9内，使得刮油环8贴靠电缸外管1的内壁，通过将刮油环8将泄漏至电缸活塞4和电缸外管1内壁之间的润滑油截住。
为了便于刮油环截住的润滑油回到油池中，在电缸活塞4上还设置回油槽10，回油槽10位于环形槽9上端；回油槽10的两端贯穿电缸活塞4的内外两侧，在电缸内管2上对应回油槽10还设有回油孔11，截住的润滑油从回油槽10流向回油孔11再回到油池7中。为了便于润滑油流向回油孔11，回油槽10还可以倾斜设置，回油槽10连接回油孔11的一端处于低位。
在使用过程中，刮油环8长期和电缸外管1的内壁之间摩擦会造成磨损，因此在环形槽9内还安装了弹性O型圈12，弹性O型圈12选用硅橡胶材料，将刮油环8套设在弹性O型圈12的外部，刮油环8一旦磨损弹性O型圈12的弹力作用下会弥补刮油环8磨损的部分，延长使用寿命。
具体的，集油装置包括接油盘13、集油壶14，接油盘13安装在电缸外管1的下端，接油盘13内部设有环形孔15、集油槽16，环形孔15设置在接油盘13的中部，电缸内管2间隙穿过环形孔15；集油槽16同轴心设置在环形孔15的外侧，集油壶14安装在接油盘13的下端一侧，集油槽16连通集油壶14，集油壶为真空泵过滤器，其型号如温州蓝星机电设备有限公司生产的真空泵过滤器。
接油盘13在使用过程中会相对电缸内管2的外壁上下移动，也即环形孔15内壁贴靠电缸内管2的外壁移动，为了便于接油盘13将从电缸活塞4和电缸外管1内壁之间泄漏的润滑油收集到集油槽16内，环形孔15上端面设有环形坡口17，环形坡口17靠近电缸内管的一侧高于环形坡口17靠近集油槽的一侧，润滑油沿环形坡口17流至集油槽16中最终回收至集油壶14中。
将该电缸驱动装置应用在游梁式抽油机中，如图6所示，包括底座18、抽油机支架19、抽油机驴头20、抽油机游梁21、电缸驱动装置22、配重23，抽油机支架19安装在底座18上端，抽油机支架19安装在抽油机游梁21的中部下端，抽油机驴头20安装在抽油机游梁21的一端，配重23安装在抽油机游梁21的另外一端，电缸驱动装置22连接在抽油机游梁21和底座18之间，电缸驱动装置22驱动抽油机游梁21一端的抽油机驴头20上下移动。
本实施例只是对本发明的进一步解释，并不是对本发明的限制，本领域技术人员在阅读完本说明书后可以根据需要对本实施例做出没有创造性的修改，但是只要在本发明的权利要求范围内都受到专利法的保护。

Claims (10)

  1. 一种电缸驱动装置，其特征在于，包括电缸外管、电缸内管、滚珠丝杠、电缸活塞、滚珠丝杠螺母，所述电缸外管套设在电缸内管外侧，所述滚珠丝杠螺母安装在电缸内管上端内部，所述滚珠丝杠一端活动连接在电缸外管内，所述滚柱丝杠另外一端配合滚珠丝杠螺母插入电缸内管内；所述电缸外管和电缸内管之间还设有电缸活塞，电缸活塞固定在电缸内管上端外部；所述电缸内管下端内部设有油池；所述电缸活塞外部安装有弹性刮油装置，所述弹性刮油装置设置在电缸活塞和电缸外管内壁之间。
  2. 根据权利要求1所述的一种电缸驱动装置，其特征在于，所述电缸外管底部还设有集油装置。
  3. 根据权利要求1所述的一种电缸驱动装置，其特征在于，所述弹性刮油装置包括刮油环，所述电缸活塞外部设有环形槽，所述刮油环安装在环形槽内，所述刮油环贴合电缸外管内壁。
  4. 根据权利要求3所述的一种电缸驱动装置，其特征在于，所述电缸活塞上还设有回油槽，所述回油槽贯穿电缸活塞内外两侧，所述电缸内管对应回油槽还设有回油孔，所述回油槽通过回油孔连通油池；所述回油槽位于环形槽上端。
  5. 根据权利要求4所述的一种电缸驱动装置，其特征在于，所述回油槽倾斜设置，所述回油槽位于电缸活塞外侧一端高于回油槽连通回油孔一端。
  6. 根据权利要求3所述的一种电缸驱动装置，其特征在于，所述刮油装置还包括弹性O型圈，所述弹性O型圈安装在环形槽内，所述刮油环套设在弹性O型环外部。
  7. 根据权利要求2所述的一种电缸驱动装置，其特征在于，所述集油装置包括接油盘、集油壶，所述接油盘安装在电缸外管下端，所述接油盘内部设有环形孔、集油槽，所述环形孔设置在接油盘中部，所述电缸内管间隙穿过环形孔；所述集油槽同轴心设置在环形孔外侧，所述集油壶 安装在接油盘下端一侧，所述集油槽连通集油壶。
  8. 根据权利要求7所述的一种电缸驱动装置，其特征在于，所述集油壶为真空泵过滤器。
  9. 根据权利要求7所述的一种电缸驱动装置，其特征在于，所述环形孔上端面设有环形坡口，所述环形坡口靠近电缸内管的一侧高于环形坡口靠近集油槽的一侧。
  10. 一种游梁式抽油机，其特征在于，包括底座、抽油机支架、抽油机驴头、抽油机游梁、电缸驱动装置、配重，所述抽油机支架安装在底座上端，所述抽油机支架安装在抽油机游梁中部下端，所述抽油机驴头安装在抽油机游梁一端，所述配重安装在抽油机游梁另外一端，所述电缸驱动装置连接在抽油机游梁和底座之间，所述电缸驱动装置驱动抽油机游梁一端的抽油机驴头上下移动，所述电缸驱动装置如权利要求1-9任意一项权利要求所述。
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