WO2017114212A1 - 一种抽油机 - Google Patents

一种抽油机 Download PDF

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Publication number
WO2017114212A1
WO2017114212A1 PCT/CN2016/110721 CN2016110721W WO2017114212A1 WO 2017114212 A1 WO2017114212 A1 WO 2017114212A1 CN 2016110721 W CN2016110721 W CN 2016110721W WO 2017114212 A1 WO2017114212 A1 WO 2017114212A1
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Prior art keywords
port
air
oil
pumping unit
passage
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PCT/CN2016/110721
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English (en)
French (fr)
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陈阿扣
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陈阿扣
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Publication of WO2017114212A1 publication Critical patent/WO2017114212A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/04—Filling or draining lubricant of or from machines or engines
    • 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

Definitions

  • the invention relates to the field of oil pumping machines, in particular to a pneumatic pumping machine.
  • the structure of the pumping unit is poor and complicated, and the operation is inconvenient. Especially in the process of discharging oil, it is easy to leak and close the key valve, which has an adverse effect on the device.
  • the invention provides a pumping unit, comprising
  • the first tank has a first opening
  • a second tank having a second port and an oil drain
  • the reversing valve comprises a first port communicating with the first port, a second port communicating with the second port, and a third port for connecting the external air source,
  • the third port 33 When the third port 33 is connected to the external air source, the third port is kept in communication with the second port, and the first port remains closed.
  • the invention provides a pumping unit.
  • the first air port and the second air port are kept in communication state, and the air pressure in the whole system of the first tank body and the second tank body is ensured to be consistent.
  • the third gas port is switched to be in communication with the second gas port, so that the external gas source is charged into the second tank body, and the oil in the second tank body is pushed out of the system through the oil discharge port.
  • the oil discharge is completed, and the first air port is closed and the external air source does not enter the first tank to prevent adverse effects on the first tank.
  • the pumping unit provided by the invention ensures that the first air port and the second air port are in a cut state during the oil discharging process, the device is simple and easy to implement, and the first air port and the second air port are in a connected state when the oil is drained in the existing structure. .
  • the present invention provides a pumping unit, the reversing valve comprising a valve housing, a valve body disposed on the valve housing, and an elastic device;
  • the valve casing has a control port, a first port, a second port, and a third port;
  • the valve body is provided with a first passage and a second passage;
  • the elastic means pushes the valve body to a position where the first passage communicates with the first port and the second port.
  • control port When the control port is inflated, the control port pushes the valve body to a position where the second passage communicates with the third port and the second port.
  • the pneumatic reversing valve is preferred in the present invention, and the device is simple, and the pneumatic device commonly used in the working process of the pumping unit can be utilized, and is safe and reliable.
  • control port is connected to an external source of air.
  • the pressure of the external air source is greater than the sum of the elastic force of the elastic device and other resistances such as friction.
  • the first can body further includes a third port
  • the second tank further includes a fourth port
  • the pumping unit further includes an oil passage connecting the third port and the fourth port, and the oil passage is provided with an oil passage valve.
  • the invention also provides an independent oil passage connecting the first tank body and the second tank body,
  • the first can body is further provided with a fifth port for connecting the negative pressure device.
  • the first port is located above the liquid level of the first can. Prevent gas from generating bubbles through the oil body.
  • the first tank body is provided with an air passage, the air passage is connected to the first port, the air passage is opened with a sixth port, and the sixth port is located above the liquid level of the first tank body.
  • the first port is connected to the liquid level of the first tank through the air passage, so that the position of the first port can be free from the liquid level.
  • the first can body includes an upper end cap, a lower end cap, and a barrel disposed between the upper end cap and the lower end cap.
  • the device is simple and high in strength.
  • the first port is located at the lower end cap.
  • the position of the first port can be free from the limitation of the liquid surface, it is preferable that the position of the first port is located at the lower end cover to provide the nearest wiring to prevent the line from being disordered.
  • the present invention may further include a support arm.
  • One end of the support arm is connected to the upper end cover, and the other end of the support arm is connected to the lower end cover.
  • the straight line of the support arm is parallel or integral with the axis of the cylinder; the support arm provides rigid support to meet Certain negative pressure rigidity requirements.
  • the airway is located within the support arm and the support arm is open with a sixth port.
  • the specific location of the airway is provided while providing a rigid support.
  • FIG. 1 is a schematic diagram of the principle of a pumping unit according to an embodiment of the present invention.
  • FIG. 2 is a schematic view showing the principle of a reversing valve of a pumping unit according to an embodiment of the present invention
  • FIG. 3 is a schematic view showing the structure of an outer portion of a pumping unit except a reversing valve according to an embodiment of the present invention.
  • the present invention provides a pumping unit, including
  • the first tank body 1 is opened with a first port 11;
  • a second tank body 2 having a second port 21 and an oil drain port 22;
  • the reversing valve 3 includes a first port 31 communicating with the first port 11, a second port 32 communicating with the second port 21, and a third port 33 for connecting an external air source,
  • the third air port 33 When the third air port 33 is not connected to the external air source, the first air port 31 and the second air port 32 are kept in communication state.
  • the third port 33 When the third port 33 is connected to the external air source, the third port 33 is kept in communication with the second port 32, and the first port 31 is kept closed.
  • the present invention provides a pumping unit in which the first port 31 and the second port 32 are kept in communication, and the air pressure in the entire system of the first can body 1 and the second can body 2 is ensured to be uniform.
  • the third port 33 is kept in communication with the second port 32, the external air source is charged into the second tank 2, and the oil in the second tank 2 is discharged.
  • the oil port 22 is pressed out of the system to complete the oil discharge, and the first gas port 31 is closed and disconnected, and the external gas source does not enter the first tank body 1 to prevent adverse effects on the first tank body 1.
  • the second tank body 2 is not in the oil discharge stage, the first tank body 1 and the second tank body 2 are ensured as a whole to provide stable negative pressure power, thereby ensuring high efficiency work in the pumping stage.
  • the pumping unit provided by the invention ensures that the first port 31 and the second port 32 are in a cut state during the oil discharging process, the device is simple and easy to implement, and the first port 31 and the second port are prevented from being drained in the existing structure. 32 is in communication.
  • the reversing valve 3 is not limited to the pneumatic reversing valve, and the manual reversing valve, the electromagnetic reversing valve and the electro-hydraulic reversing valve are all within the scope of the claimed invention.
  • the present invention provides a pumping unit, the reversing valve 3 includes a valve housing 35, a valve body 36 disposed in the valve housing 35 and the elastic device 34;
  • the valve housing 35 is provided with a control port 39, a first port 31, a second port 32, and a third port 33;
  • the valve body 36 is provided with a first passage 37 and a second passage 38;
  • the elastic means 34 urges the valve body 36 to a position where the first passage 37 communicates with the first port 31 and the second port 32.
  • control port 39 When the control port 39 is energized, the control port 39 pushes the valve body 36 to a position where the second passage 38 communicates with the third port 33 and the second port 32.
  • the pneumatic reversing valve is preferred in the present invention, and the device is simple, and the pneumatic device commonly used in the working process of the pumping unit can be utilized, and is safe and reliable.
  • control port 39 is connected to an external source of air.
  • the pressure of the external air source is greater than the sum of the elastic force of the elastic device 34 and other resistances such as friction.
  • the first can body 1 further includes a third port 12, and the second can body 2 further includes a fourth port 23, and the pumping unit further includes a third port 12 and a fourth port 23.
  • the oil passage 4 and the oil passage 4 are provided with an oil passage valve 41.
  • the invention also provides an independent oil passage connecting the first tank body 1 and the second tank body 2,
  • the first can body 1 is further provided with a fifth port 13 for connecting a vacuum device.
  • the pumping unit provided by the invention mainly has the following working conditions when working:
  • the starting energy storage phase the air passages of the first tank body 1 and the second tank body 2 (the passages of the first port 11, the second port 32, and the reversing valve 3) are kept in communication;
  • the vacuum device is evacuated at the fifth port 13 so that the entire system of the first can body 1 and the second can body 2 reaches the required working condition negative pressure.
  • the oil suction port (not shown) communicating with the first tank body 1 is placed in a container to be pumped (such as an engine oil pipeline), the valve of the oil suction port is opened, and the oil body in the oil pumping container is sucked into the first tank.
  • Body 1 the first pipe body 1 is often a transparent pressure gauge, has a visible outer casing, is convenient for visual inspection of the oil body quality, and has the function of measuring the volume of the oil body, and timely discovers the quality defects of the oil pumping container assembly (engine).
  • Oil collection stage keep the air passages connected and open the oil passages 4,
  • the oil body visually and measured through the first tank 1 is introduced into the second tank body 2 through the oil passage 4 to facilitate the vacancy of the first tank body 1 to enter the subsequent oil pumping measurement of the other oil pumping container assembly. stage.
  • the pumping unit provided by the invention mainly has:
  • the second air port 32 communicating with the second tank 2 is filled with an external air source, and a large amount of oil stored in the second tank 2 is discharged out of the system through the oil discharge port 22.
  • Closing the air passage and the oil passage prevent the external air source from entering the first tank 1, preventing damage and pollution to the first tank 1, and affecting measurement stability.
  • the above-mentioned reversing valve 3 proposed by the applicant ensures that the first tank body 1 and the second tank body 2 as a whole during the non-system oil discharge stage, and creates a certain negative pressure for the whole during the start-up energy storage stage; In the oil measurement stage, the oil is extracted by the overall negative pressure. Before and after the single component to be pumped, the overall negative pressure does not change much, and the efficiency of oil extraction is improved.
  • the first port 11 is located above the liquid level of the first can body 1. Prevent gas from generating bubbles through the oil body.
  • the first tank body 1 is provided with an air passage 15, the air passage 15 is connected to the first port 11, the air passage 15 is opened with a sixth port 16, and the sixth port 16 is located at the first tank body 1. Above the liquid level.
  • the first port 11 communicates with the liquid surface of the first can body 1 through the air passage 15, so that the position of the first port 11 can be restricted from the liquid surface.
  • the first can body 1 includes an upper end cover 17, a lower end cover 18, and a cylindrical body 19 disposed between the upper end cover 17 and the lower end cover 18.
  • the device is simple and high in strength.
  • the first port 11 is located at the lower end cover 18. On the basis that the position of the first port 11 is not limited by the liquid level, it is preferable that the position of the first port 11 is located at the lower end cover 18 to provide a close connection to prevent the line from being disturbed.
  • the present invention may further include a support arm 5, one end of the support arm 5 is connected to the upper end cover 17, and the other end of the support arm 5 is connected to the lower end cover 18, and the straight line of the support arm 5 is parallel or integral with the axis of the cylinder 19; the support arm 5 Provides rigid support to meet certain negative pressure requirements.
  • the air passage 15 can be located within the support arm 5 and the support arm 5 is open with a sixth opening 16.
  • the specific location of the air passage 15 is provided while providing a rigid support.

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  • Life Sciences & Earth Sciences (AREA)
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Abstract

一种用于从待抽油容器中抽油的抽油机被公开。该抽油机包括开有第一口（11）的第一罐体（1），开有第二口（21）和排油口（22）的第二罐体（2）；以及换向阀（3），换向阀（3）包括连通第一口（11）的第一气口（31）、连通第二口（21）的第二气口（32）和用于连通外部气源的第三气口（33），第三气口（33）没有接入外部气源时，第一气口（31）和第二气口（32）保持连通状态，第三气口（33）接入外部气源时，第三气口（33）与第二气口（32）保持连通。该抽油机在需要将第二罐体（2）内的油排出时，切换至第三气口（33）与第二气口（32）保持连通，使用外部气源充入第二罐体（2），将第二罐体（2）内的油经排油口（22）压出体系外，完成排油。

Description

一种抽油机 技术领域
本发明涉及抽油机领域，具体涉及气动抽机油机。
背景技术
目前抽油机结构不良且复杂，操作不方便，尤其在排油过程中，容易漏关闭关键阀门，对装置造成不良影响。
发明内容
本发明的目的是提供一种抽油机，解决上述现有技术问题中的一个或者多个。
本发明提供的一种抽油机，包括
第一罐体，开有第一口；
第二罐体，开有第二口和排油口；以及
换向阀；
其中，换向阀包括连通第一口的第一气口、连通第二口的第二气口和用于连通外部气源的第三气口，
第三气口没有接入外部气源时，第一气口和第二气口保持连通状态，
第三气口33接入外部气源时，第三气口与第二气口保持连通，第一气口保持封闭。
本发明提供一种抽油机，在工作过程中，第一气口和第二气口保持连通状态，保证第一罐体与第二罐体整体体系内气压一致。在需要将第二罐体内的油排出时，切换至第三气口与第二气口保持连通，使外部气源充入第二罐体，将第二罐体内油经排油口压出体系外，完成排油，并且第一气口封闭断开，外部气源不进入第一罐体，防止对第一罐体的不良影响。
本发明提供的抽油机，保证了排油过程中第一气口和第二气口处于切断的状态，装置简单，容易实施，防止现有结构中排油时候第一气口和第二气口处于连通状态。
在一些实施方式，本发明提供的一种抽油机，换向阀包括阀壳、设于阀壳的阀体以及弹性装置；
阀壳开有控制气口、第一气口、第二气口、第三气口；
阀体设有第一通道和第二通道；
在控制气口不得气时，弹性装置将阀体推动至第一通道连通第一气口和第二气口的位置。
在控制气口得气时，控制气口将阀体推动至第二通道连通第三气口与第二气口的位置。
本发明优选气动换向阀，装置简单，可以利用抽油机工作过程中常用的气动装置，并且安全可靠。
在一些实施方式，控制气口连通外部气源。外部气源的压力大于弹性装置的弹力以及其他阻力(比如摩擦力)的和。
在一些实施方式，第一罐体还包括第三口，
第二罐体还包括第四口，
抽油机还包括连通第三口和第四口的油路通道，油路通道设有油路阀。
本发明还提供独立的油路，连接第一罐体和第二罐体，
在一些实施方式，第一罐体还设置有用于连接负压装置的第五口。
在一些实施方式，第一口位于第一罐体的液面以上。防止气体通过油体产生气泡。
在一些实施方式，第一罐体内设有气道，气道连通第一口，气道开有第六口，第六口位于第一罐体的液面以上。
第一口通过气道连通第一罐体的液面以上，这样，第一口的位置可以不受液面的限制。
在一些实施方式，第一罐体包括上端盖，下端盖以及设置于上端盖和下端盖之间的筒体。装置简单，强度高。
在一些实施方式，第一口位于下端盖。在第一口的位置可以不受液面的限制的基础上，优选第一口的位置位于下端盖，提供就近接线，防止线路紊乱的作用。
在一些实施方式，本发明还可以还包括支撑臂，支撑臂一端连接上端盖，支撑臂的另一端连接下端盖，支撑臂所在直线与筒体的轴线平行或一体；支撑臂提供刚性支撑，满足一定的负压刚性需求。
在一些实施方式，气道位于支撑臂内，支撑臂开有第六口。在提供刚性支撑的同时，提供气道的具体位置。
附图说明
图1为本发明提供的一种实施方式的一种抽油机的原理示意图；
图2为本发明提供的一种实施方式的一种抽油机的换向阀的原理示意图；
图3为本发明提供的一种实施方式的一种抽油机的除换向阀外部分结构的示意图。
具体实施方式
下面结合说明书附图，对本发明进行进一步详细的说明。
如图1～3所示，本发明提供的一种抽油机，包括
第一罐体1，开有第一口11；
第二罐体2，开有第二口21和排油口22；以及
换向阀3；
其中，换向阀3包括连通第一口11的第一气口31、连通第二口21的第二气口32和用于连通外部气源的第三气口33，
第三气口33没有接入外部气源时，第一气口31和第二气口32保持连通状态，
第三气口33接入外部气源时，第三气口33与第二气口32保持连通，第一气口31保持封闭。
本发明提供一种抽油机，在工作过程中，第一气口31和第二气口32保持连通状态，保证第一罐体1与第二罐体2整体体系内气压一致。在需要将第二罐体2内的油排出时，切换至第三气口33与第二气口32保持连通，使外部气源充入第二罐体2，将第二罐体2内油经排油口22压出体系外，完成排油，并且第一气口31封闭断开，外部气源不进入第一罐体1，防止对第一罐体1的不良影响。第二罐体2非排油阶段时，保证第一罐体1和第二罐体2作为一个整体提供稳定的负压动力，确保抽油阶段的高效率工作。
本发明提供的抽油机，保证了排油过程中第一气口31和第二气口32处于切断的状态，装置简单，容易实施，防止现有结构中排油时候第一气口31和第二气口32处于连通状态。
本发明提供的抽油机，其换向阀3不限于气动换向阀，手动换向阀、电磁换向阀、电液换向阀均在本发明要求保护的范围之内。
如图2所示，优选的，本发明提供的一种抽油机，换向阀3包括阀壳35、设于阀壳35的阀体36以及弹性装置34；
阀壳35开有控制气口39、第一气口31、第二气口32、第三气口33；
阀体36设有第一通道37和第二通道38；
在控制气口39不得气时，弹性装置34将阀体36推动至第一通道37连通第一气口31和第二气口32的位置。
在控制气口39得气时，控制气口39将阀体36推动至第二通道38连通第三气口33与第二气口32的位置。
本发明优选气动换向阀，装置简单，可以利用抽油机工作过程中常用的气动装置，并且安全可靠。
优选的，控制气口39连通外部气源。外部气源的压力大于弹性装置34的弹力以及其他阻力(比如摩擦力)的和。
如图1、3所示，此外，第一罐体1还包括第三口12，第二罐体2还包括第四口23，抽油机还包括连通第三口12和第四口23的油路通道4，油路通道4设有油路阀41。
本发明还提供独立的油路，连接第一罐体1和第二罐体2，
优选的，第一罐体1还设置有用于连接负压装置的第五口13。
本发明提供的一种抽油机，工作时，主要有以下几个工况：
开机储能阶段：第一罐体1和第二罐体2的气路通道(第一口11、第二气口32、换向阀3的通路)保持连通；
负压装置在第五口13抽真空，使第一罐体1和第二罐体2的整体体系达到需要的工况负压。
抽油测量阶段：保持气路通道连通，油路通道4关闭的状态；
将与第一罐体1连通的吸油口(图中未示)置于待抽油容器(如发动机机油管路)，开启吸油口的阀门，将待抽油容器内的油体吸入第一罐体1，第一管体1往往是透明承压量具，具有可视外壳，便于目视油体质量，并具有测量油体体积的功能，及时发现待抽油容器组件(发动机)的质量缺陷。
收油阶段：保持气路通道连通，开启油路通道4，
将经过第一罐体1目视及测量后的油体经过油路通道4进入第二罐体2，以便于空出第一罐体1，以进入后续其他待抽油容器组件的抽油测量阶段。
本发明提供的一种抽油机，非工作时，主要有：
体系排油阶段：关闭气路通道和油路通道；
向与第二罐体2连通的第二气口32充入外部气源，将第二罐体2内存储的大量油体经排油口22排出体系外。
关闭气路通道和油路通道是防止外部气源进入第一罐体1，防止对第一罐体1造成损坏和污染，影响测量稳定性。
在处理上述工作工况和非工况要求下的连通状况，需要设置多个通路，并且各个通路之间在配合时候需要严格遵守使用规则，稍有不慎，即有可能关错阀门，造成装置的毁损。
申请人在潜心研究上述各个工作状态和非工作状况对通路的要求，提出了上述换向阀3，降低了使用者专业的需求，只要进入体系排油阶段，自 动关闭第一罐体1的第一口11。使用简单，维护方便。
申请人提出的上述换向阀3在非体系排油阶段时，确保第一罐体1和第二罐体2作为一个整体，在开机储能阶段，给这个整体创造一定的负压；在抽油测量阶段，以整体的负压进行油液的抽取，在抽取单个待抽油容器组件的前后，整体的负压力改变不大，提高油液抽取的效率。
优选的，第一口11位于第一罐体1的液面以上。防止气体通过油体产生气泡。
如图3所示，优选的，第一罐体1内设有气道15，气道15连通第一口11，气道15开有第六口16，第六口16位于第一罐体1的液面以上。
第一口11通过气道15连通第一罐体1的液面以上，这样，第一口11的位置可以不受液面的限制。
进一步，第一罐体1包括上端盖17，下端盖18以及设置于上端盖17和下端盖18之间的筒体19。装置简单，强度高。
更进一步，第一口11位于下端盖18。在第一口11的位置可以不受液面的限制的基础上，优选第一口11的位置位于下端盖18，提供就近接线，防止线路紊乱的作用。
此外，本发明还可以还包括支撑臂5，支撑臂5一端连接上端盖17，支撑臂5的另一端连接下端盖18，支撑臂5所在直线与筒体19的轴线平行或一体；支撑臂5提供刚性支撑，满足一定的负压刚性需求。
气道15可以位于支撑臂5内，支撑臂5开有第六口16。
在提供刚性支撑的同时，提供气道15的具体位置。
以上表述仅为本发明的优选方式，应当指出，对本领域的普通技术人员来说，在不脱离本发明创造构思的前提下，还可以做出若干变形和改进，这些也应视为本发明的保护范围之内。

Claims (10)

  1. 一种抽油机，其特征在于，包括
    第一罐体(1)，开有第一口(11)；
    第二罐体(2)，开有第二口(21)和排油口(22)；以及
    换向阀(3)；
    其中，所述换向阀(3)包括连通第一口(11)的第一气口(31)、连通第二口(21)的第二气口(32)和用于连通外部气源的第三气口(33)，
    所述第三气口(33)没有接入外部气源时，所述第一气口(31)和所述第二气口(32)保持连通状态，
    所述第三气口(33)接入外部气源时，所述第三气口(33)与所述第二气口(32)保持连通，第一气口(31)保持封闭。
  2. 根据权利要求1所述的一种抽油机，其特征在于，
    所述换向阀(3)包括阀壳(35)、设于所述阀壳(35)的阀体(36)以及弹性装置(34)；
    所述阀壳(35)开有控制气口(39)、所述第一气口(31)、所述第二气口(32)、所述第三气口(33)；
    所述阀体(36)设有第一通道(37)和第二通道(38)；
    在所述控制气口(39)不得气时，所述弹性装置(34)将所述阀体(36)推动至所述第一通道(37)连通所述第一气口(31)和所述第二气口(32)的位置。
    在所述控制气口(39)得气时，所述控制气口(39)将所述阀体(36)推动至所述第二通道(38)连通所述第三气口(33)与所述第二气口(32)的位置。
  3. 根据权利要求2所述的一种抽油机，其特征在于，所述控制气口(39)连通所述外部气源。
  4. 根据权利要求1所述的一种抽油机，其特征在于，
    所述第一罐体(1)还包括第三口(12)，
    所述第二罐体(2)还包括第四口(23)，
    所述抽油机还包括连通所述第三口(12)和所述第四口(23)的油路通道(4)，所述油路通道(4)设有油路阀(41)。
  5. 根据权利要求1所述的一种抽油机，其特征在于，所述第一口(11)位于所述第一罐体(1)的液面以上。
  6. 根据权利要求1所述的一种抽油机，其特征在于，所述第一罐体(1)内设有气道(15)，所述气道(15)连通所述第一口(11)，所述气道(15)开有第六口(16)，所述第六口(16)位于所述第一罐体(1)的液面以上。
  7. 根据权利要求6所述的一种抽油机，其特征在于，所述第一罐体(1)包括上端盖(17)，下端盖(18)以及设置于所述上端盖(17)和下端盖(18)之间的筒体(19)。
  8. 根据权利要求7所述的一种抽油机，其特征在于，所述第一口(11)位于下端盖(18)。
  9. 根据权利要求8所述的一种抽油机，其特征在于，还包括支撑臂(5)，所述支撑臂(5)一端连接所述上端盖(17)，所述支撑臂(5)的另一端连接所述下端盖(18)，所述支撑臂(5)所在直线与所述筒体(19)的轴线平行或一体。
  10. 根据权利要求9所述的一种抽油机，其特征在于，所述气道(15)位于所述支撑臂(5)内，所述支撑臂(5)开有所述第六口(16)。
PCT/CN2016/110721 2015-12-30 2016-12-19 一种抽油机 WO2017114212A1 (zh)

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