CN204346540U - Reduction box liquid level meter of oil pumping unit - Google Patents

Reduction box liquid level meter of oil pumping unit Download PDF

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Publication number
CN204346540U
CN204346540U CN201420740493.8U CN201420740493U CN204346540U CN 204346540 U CN204346540 U CN 204346540U CN 201420740493 U CN201420740493 U CN 201420740493U CN 204346540 U CN204346540 U CN 204346540U
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CN
China
Prior art keywords
connecting pipe
pipe
pumping unit
oil pumping
reduction gearbox
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Expired - Fee Related
Application number
CN201420740493.8U
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Chinese (zh)
Inventor
王新期
任双玲
钱勇
张臣静
赵军
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Petrochina Co Ltd
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Petrochina Co Ltd
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Filing date
Publication date
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Priority to CN201420740493.8U priority Critical patent/CN204346540U/en
Application granted granted Critical
Publication of CN204346540U publication Critical patent/CN204346540U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model provides a beam-pumping unit reducing gear box level gauge. This beam-pumping unit reducing gear box level gauge includes: the first end of the first connecting pipe is used for being communicated with the bottom of an oil cavity of the reduction gearbox of the pumping unit; the first end of the second connecting pipe is communicated with the top of the oil cavity; the two ends of the perspective pipe are respectively communicated with the first connecting pipe and the second connecting pipe. The utility model discloses a beam-pumping unit reducing gear box level gauge need not to unload the quick-witted hydraulic fluid port end cover of pine beam-pumping unit reducing gear box next door, and simple structure is convenient for observe the fluid of the fluid intracavity of beam-pumping unit reducing gear box.

Description

Oil pumping unit reduction gearbox liquid level gauge
Technical field
The utility model relates to liquid level gauge technical field, in particular to a kind of oil pumping unit reduction gearbox liquid level gauge.
Background technology
Oil pumper is a kind of machinery and equipment of recover petroleum, is commonly called as " machine of kowtowing ", makes oil go out well by the way of pressurization.When oil pumper upstroke, oil pipe elastic shrinkage moves upward, and driving mechanical block-relief oil production device moves upward, and clashes into sliding sleeve and produces vibration; Meanwhile, copper current only valve cuts out, and reducing piston assembly shutoff oil is when oil pumper down stroke, and oil pipe elastic elongation moves downward, and driving mechanical block-relief oil production device moves downward, and clashes into sliding sleeve and produces vibration; Meanwhile, reversed check valve part is closed, and reducing piston assembly is shutoff oil jacket ring shaped oil passage still, makes reversed check valve lower zone form higher-pressure region, and the oil flow channel of this motion again in formation produces a kind of reverse impulsive force.
Common oil pumper and walking-beam pumping unit are traditional pumping units of oil field widespread use, are usually directly dragged by ordinary ac asynchronous motor.Its crank band drives sucker rod with balance, drives downhole pump to fix pumping of cycle, the oil of down-hole is delivered to ground.In a jig frequency, along with the rise/fall of sucker rod, and make machine operation at electronic/generating state.Uphill process motor absorbs energy electric operation from electrical network; The load characteristic of decline process motor is potential load, and DH negative pressure etc. make motor be in generating state in addition, and mechanical energy is converted to electric energy feedback to electrical network.
But the situation of down-hole oil reservoir is complicated especially, there is dividing of rich oil well, stripper, have thin oil well, heavy oil wells not.Constant speed application problem is apparent.Do not talk as abandoned these, with regard to oil pumper oil pump itself, piston after wearing and tearing and the gap leaking loss etc. of lining are all very scabrous problems, moreover the formation factor of change is as also having a great impact each oil mass of extracting out containing complex situations such as sand, wax, water, gas in oil.It seems to only have speed governing to drive and just Optimal Control can be reached.
After introducing regulator drive, according to the down-hole status adjustment oil pumper stroke frequency and the speed regulating upper and lower stroke respectively, pump leakage can be reduced while the fill factor improving pump, to obtain maximum oil pump capacity.Especially adopt frequency control both to impact without starting, the problems such as the power factor that can to solve again that type selecting is guarded, circuit is longer etc. caused is on the low side, can improve machine life again while acquisition energy efficiency.Especially the life-span of oil pump, reduce mechanical fault and improve reliability.
Reducer casing is as the core apparatus of oil pumper, its operational situation is directly relevant to oil pumper, according to equipment control requirement, it is reasonable liquid level that speed reduction unit engine oil level value will remain within the scope of 1/3-2/3, current reducer casing does not have liquid level gauge, during liquid level of checking up Engine oil, after the end cap of reducer casing side oil hole be loosened, could check.There is the problems such as length consuming time, efficiency are low, environmental pollution, potential safety hazard, the inconvenience of reducer casing level value monitoring simultaneously, machine oil sampling difficulty, cannot timely and effective confirmation oil pumping unit reduction gearbox duty.
Utility model content
Fundamental purpose of the present utility model is to provide a kind of oil pumping unit reduction gearbox liquid level gauge being convenient to detect the fluid in oil pumping unit reduction gearbox.
To achieve these goals, the utility model provides a kind of oil pumping unit reduction gearbox liquid level gauge, comprising: the first connecting pipe, and the first end of the first connecting pipe is used for being communicated with the bottom in the fluid chamber of oil pumping unit reduction gearbox; Second connecting pipe, the first end of the second connecting pipe is used for being communicated with the top in fluid chamber; Perspective pipe, the two ends of perspective pipe are communicated with the second connecting pipe with the first connecting pipe respectively.
Further, the first connecting pipe and the second connecting pipe are parallel to each other, and perspective pipe is perpendicular to the first connecting pipe and the second connecting pipe.
Further, perspective pipe is glass tube.
Further, the first end of the first connecting pipe and the first end of the second connecting pipe are provided with connecting thread.
Further, oil pumping unit reduction gearbox liquid level gauge also comprises sampling assemble, and sampling assemble comprises: sampling pipe, and sampling pipe is connected with the first connecting pipe; Control piece, control piece controls sampling pipe and is communicated with the part with fluid of the first connecting pipe or disconnects.
Further, sampling pipe is arranged on the side away from perspective pipe of the first connecting pipe, and sampling pipe and the link position of the first connecting pipe are arranged on the side being communicated with the first end away from the first connecting pipe of position of having an X-rayed and managing with the first connecting pipe.
Further, control piece is core bar, and core bar is plugged in the first connecting pipe from the second end of the first connecting pipe, and core bar controls sampling pipe along the length direction to-and-fro movement of the first connecting pipe and to be communicated with the part with fluid of the first connecting pipe or to disconnect.
Further, the pore inwall of the second end of the first connecting pipe is provided with internal thread, one end of the first end away from the first connecting pipe of core bar is provided with the external thread with screw-internal thread fit.
Further, one end of the first end near the first connecting pipe of core bar is arranged with O-ring seal, when the part with fluid of sampling pipe and the first connecting pipe disconnects by core bar, O-ring seal to be communicated with position and between sampling pipe and the first connecting pipe link position at perspective pipe with the first connecting pipe.
Further, sampling assemble also comprises control lever, control lever be arranged on the first end away from the first connecting pipe of core bar side and perpendicular to core bar.
Application the technical solution of the utility model, when using oil pumping unit reduction gearbox liquid level gauge of the present utility model to check the fluid in reducer casing, the bottom of the first connecting pipe with oil pumping unit reduction gearbox fluid chamber is only needed to be connected, and the top of the second connecting pipe with oil pumping unit reduction gearbox fluid chamber is connected, now, the fluid chamber being connected to perspective pipe between the first connecting pipe and the second connecting pipe and oil pumping unit reduction gearbox forms a U-shaped structure, and due to the connection function of the second connecting pipe, perspective intraductal pressure is consistent with the pressure in the fluid chamber of oil pumping unit reduction gearbox, now, by having an X-rayed the effect of pipe, just can observe out the fluid amount in the fluid chamber in oil pumping unit reduction gearbox fluid chamber, without the need to loosening the machine oil mouth end cap on oil pumping unit reduction gearbox side, structure is simple, be convenient to the fluid observed in the fluid chamber of oil pumping unit reduction gearbox.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 diagrammatically illustrates the front view of oil pumping unit reduction gearbox liquid level gauge of the present utility model.
Wherein, above-mentioned accompanying drawing comprises the following drawings mark:
10, the first connecting pipe;
11, internal thread;
20, the second connecting pipe;
30, perspective pipe;
40, connecting thread;
50, sampling assemble;
51, sampling pipe;
52, control piece;
521, external thread;
53, O-ring seal;
54, control lever.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.
It is noted that following detailed description is all exemplary, be intended to provide further instruction to the application.Unless otherwise, all technology used herein and scientific terminology have the identical meanings usually understood with the application person of an ordinary skill in the technical field.
It should be noted that used term is only to describe embodiment here, and be not intended to the illustrative embodiments of restricted root according to the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative is also intended to comprise plural form, in addition, it is to be further understood that, " comprise " when using term in this manual and/or " comprising " time, it indicates existing characteristics, step, operation, device, assembly and/or their combination.
It should be noted that, term " first ", " second " etc. in the instructions of the application and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as the embodiment example of the application described herein if with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
For convenience of description, here can usage space relative terms, as " ... on ", " in ... top ", " at ... upper surface ", " above " etc., be used for the spatial relation described as a device shown in the figure or feature and other devices or feature.Should be understood that, space relative terms is intended to comprise the different azimuth in use or operation except the described in the drawings orientation of device.Such as, " in other devices or structure below " or " under other devices or structure " will be positioned as after if the device in accompanying drawing is squeezed, being then described as the device of " above other devices or structure " or " on other devices or structure ".Thus, exemplary term " in ... top " can comprise " in ... top " and " in ... below " two kinds of orientation.This device also can other different modes location (90-degree rotation or be in other orientation), and relatively describe space used here and make respective explanations.
Now, the illustrative embodiments according to the application is described with reference to the accompanying drawings in more detail.But these illustrative embodiments can be implemented by multiple different form, and should not be interpreted as being only limited to embodiment set forth herein.Should be understood that, provide these embodiments be in order to make the application open thorough and complete, and the design of these illustrative embodiments is fully conveyed to those of ordinary skill in the art.
As background technology is recorded, reducer casing is as the core apparatus of oil pumper, its operational situation is directly relevant to oil pumper, according to equipment control requirement, it is reasonable liquid level that speed reduction unit engine oil level value will remain within the scope of 1/3-2/3, and current reducer casing does not have liquid level gauge, during liquid level of checking up Engine oil, after loosening the end cap of reducer casing side oil hole, could check.There is the problems such as length consuming time, efficiency are low, environmental pollution, potential safety hazard, the inconvenience of reducer casing level value monitoring simultaneously, machine oil sampling difficulty, cannot timely and effective confirmation oil pumping unit reduction gearbox duty.In order to solve the problem, the utility model provides a kind of oil pumping unit reduction gearbox liquid level gauge.
Embodiment 1
Shown in Figure 1, according to the first embodiment of the present utility model, provide a kind of oil pumping unit reduction gearbox liquid level gauge.This oil pumping unit reduction gearbox liquid level gauge comprises the first connecting pipe 10, second connecting pipe 20 and perspective pipe 30.
Wherein, the first end of the first connecting pipe 10 is used for being communicated with the bottom in the fluid chamber of oil pumping unit reduction gearbox; The first end of the second connecting pipe 20 is used for being communicated with the top in fluid chamber; The two ends of perspective pipe 30 are communicated with the second connecting pipe 20 with the first connecting pipe 10 respectively.
When using oil pumping unit reduction gearbox liquid level gauge of the present utility model to check the fluid in reducer casing, the bottom of the first connecting pipe 10 with oil pumping unit reduction gearbox fluid chamber is only needed to be connected, the top of the second connecting pipe 20 with oil pumping unit reduction gearbox fluid chamber is connected, now, the perspective pipe 30 be connected between the first connecting pipe 10 and the second connecting pipe 20 forms a U-shaped structure with the fluid chamber of oil pumping unit reduction gearbox, and due to the connection function of the second connecting pipe 20, pressure in perspective pipe 30 is consistent with the pressure in the fluid chamber of oil pumping unit reduction gearbox, now, by having an X-rayed the effect of pipe 30, just can observe out the fluid amount in the fluid chamber in oil pumping unit reduction gearbox fluid chamber, without the need to loosening the machine oil mouth end cap on oil pumping unit reduction gearbox side, structure is simple, be convenient to the fluid observed in the fluid chamber of oil pumping unit reduction gearbox.
Preferably, the first connecting pipe 10 and the second connecting pipe 20 are parallel to each other, and perspective pipe 30 is perpendicular to the first connecting pipe 10 and the second connecting pipe 20.According to the present embodiment, because the first connecting pipe 10 and the second connecting pipe 20 are parallel to each other, and perspective pipe 30 is vertically connected between the first connecting pipe 10 and the second connecting pipe 20, when the oil pumping unit reduction gearbox liquid level gauge of the present embodiment is connected on oil pumping unit reduction gearbox, perspective pipe 30 is parallel to each other with the fluid chamber of oil pumping unit reduction gearbox, accurately can detect the fluid in oil pumping unit reduction gearbox fluid chamber.
In a kind of preferred embodiment of the present utility model, perspective pipe 30 is glass tube, and structure is simple, is convenient to realize.
In order to the oil pumping unit reduction gearbox liquid level gauge of the present embodiment is connected on oil pumping unit reduction gearbox well, the first end of first connecting pipe 10 of the present embodiment and the first end of the second connecting pipe 20 are provided with connecting thread 40, by the connection function of connecting thread 40, first connecting pipe 10 and the second connecting pipe 20 are connected on oil pumping unit reduction gearbox, structure is simple, is convenient to realize.
Similarly, in order to perspective pipe 30 being connected on the first connecting pipe 10 and the second connecting pipe 20, the two ends of perspective pipe 30 are respectively arranged with connecting thread, and correspondence is provided with the connecting thread that perspective pipe 30 coordinates on the first connecting pipe 10 and the second connecting pipe 20, simple and convenient.
It should be noted that, the second end of second connecting pipe 20 of the present embodiment is blind end.
Embodiment 2
According to the second embodiment of the present utility model, provide a kind of oil pumping unit reduction gearbox liquid level gauge.The structure of the oil pumping unit reduction gearbox liquid level gauge of the present embodiment and the substantially identical of the first embodiment, difference is, the oil pumper liquid level gauge of the present embodiment, except having above-mentioned structure, also comprises following structure.
Refer again to described in Fig. 1, the oil pumping unit reduction gearbox liquid level gauge of the present embodiment also comprises sampling assemble 50, and this sampling assemble 50 comprises sampling pipe 51 and control piece 52.
Wherein, sampling pipe 51 is connected with the first connecting pipe 10; Control piece 52 controls sampling pipe 51 and is communicated with the part with fluid of the first connecting pipe 10 or disconnects.
According to the oil pumping unit reduction gearbox liquid level gauge of the present embodiment, when needing to sample to the fluid in oil pumping unit reduction gearbox, sampling pipe 51 can be made to be communicated with the part with fluid of the first connecting pipe 10 by the control action of control piece 52, now, the fluid of the first connecting pipe 10 comes the fluid chamber to oil pumping unit reduction gearbox, when sampling pipe 51 is communicated with the part with fluid of the first connecting pipe 10, first connecting pipe 10 inner fluid flow to sampling pipe 51, and then the sampling realized oil pumper, simple and convenient, can effectively prevent sampling process to the pollution of oil pumping unit reduction gearbox and air.
Preferably, sampling pipe 51 is arranged on the side away from perspective pipe 30 of the first connecting pipe 10, and sampling pipe 51 and the link position of the first connecting pipe 10 are arranged on the side being communicated with the first end away from the first connecting pipe 10 of position of having an X-rayed pipe 30 and the first connecting pipe 10.
According to the structure of the present embodiment, can effectively the level gauging state of oil pumping unit reduction gearbox and sampling state be separated, avoid the appearance must carrying out the phenomenon sampled when oil liquid detection, be skillfully constructed, structure is simple.
Preferably, control piece 52 is core bar, core bar is plugged in the first connecting pipe 10 from the second end of the first connecting pipe 10, and core bar controls sampling pipe 51 along the length direction to-and-fro movement of the first connecting pipe 10 and to be communicated with the part with fluid of the first connecting pipe 10 or to disconnect.
According to the present embodiment, during work, operating personnel only need to drive core bar to move at the length direction of the first connecting pipe 10, when core bar moves along the first end away from the first connecting pipe 10, the first end near the first connecting pipe 10 of core bar move to the position that sampling pipe 51 is connected with the first connecting pipe 10 time, the part with fluid of the first connecting pipe 10 can be made to be communicated with sampling pipe 51, and then to realize the sampling to the fluid in oil pumping unit reduction gearbox.
When operating personnel drive core bar to move along the direction near the first connecting pipe 10, first connecting pipe 10 can cover with the link position of sampling pipe 51 by core bar, and then the part with fluid of the first connecting pipe 10 is disconnected with sampling pipe 51, stop the sampling to the fluid in oil pumping unit reduction gearbox.
Preferably, one end of the first end near the first connecting pipe 10 of core bar is arranged with O-ring seal 53, when the part with fluid of sampling pipe 51 and the first connecting pipe 10 disconnects by core bar, between the position that O-ring seal 53 is connected with the first connecting pipe 10 in perspective the pipe 30 and position that is communicated with of the first connecting pipe 10 and sampling pipe 51, by the effect of O-ring seal 53, can effectively prevent the fluid in oil pumping unit reduction gearbox from leaking between the first connecting pipe 10 and the gap of core bar.
Preferably, the pore inwall of the second end of the first connecting pipe 10 is provided with internal thread 11, one end of the first end away from the first connecting pipe 10 of core bar is provided with the external thread 521 coordinated with internal thread 11.When needs drive core bar, only need to rotate core bar and core bar can be made along the length to-and-fro movement of the first connecting pipe 10, structure is simple, convenient operation.
Preferably, sampling assemble 50 also comprises control lever 54, this control lever 54 be arranged on the first end away from the first connecting pipe 10 of core bar side and perpendicular to core bar, when needs drive core bar motion time, operating personnel can hand-held bar 54 with force, convenient operation.
As can be seen from the above description, the utility model the above embodiments achieve following technique effect:
Oil pumping unit reduction gearbox of the present utility model can realize multi-functional use, both the oil liquid level of oil pumping unit reduction gearbox can have been detected, machine oil sampling can be carried out again, alleviate employee and operate labour intensity, simplify operation steps, stop the equipment abnormal operating state caused because liquid level is too high or too low, improve assured processibility factor, reach the requirement of enterprise security manager.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims (10)

1. an oil pumping unit reduction gearbox liquid level gauge, is characterized in that, comprising:
First connecting pipe (10), the first end of described first connecting pipe (10) is used for being communicated with the bottom in the fluid chamber of oil pumping unit reduction gearbox;
Second connecting pipe (20), the first end of described second connecting pipe (20) is used for being communicated with the top in described fluid chamber;
Perspective pipe (30), the two ends of described perspective pipe (30) are communicated with described second connecting pipe (20) with described first connecting pipe (10) respectively.
2. oil pumping unit reduction gearbox liquid level gauge according to claim 1, it is characterized in that, described first connecting pipe (10) and described second connecting pipe (20) are parallel to each other, and described perspective pipe (30) is perpendicular to described first connecting pipe (10) and described second connecting pipe (20).
3. oil pumping unit reduction gearbox liquid level gauge according to claim 1, is characterized in that, described perspective pipe (30) is glass tube.
4. oil pumping unit reduction gearbox liquid level gauge according to claim 1, is characterized in that, the first end of described first connecting pipe (10) and the first end of described second connecting pipe (20) are provided with connecting thread (40).
5. oil pumping unit reduction gearbox liquid level gauge according to claim 1, is characterized in that, described oil pumping unit reduction gearbox liquid level gauge also comprises sampling assemble (50), and described sampling assemble (50) comprising:
Sampling pipe (51), described sampling pipe (51) is connected with described first connecting pipe (10);
Control piece (52), described control piece (52) controls described sampling pipe (51) and is communicated with the part with fluid of described first connecting pipe (10) or disconnects.
6. oil pumping unit reduction gearbox liquid level gauge according to claim 5, it is characterized in that, described sampling pipe (51) is arranged on the side away from described perspective pipe (30) of described first connecting pipe (10), and described sampling pipe (51) and the link position of described first connecting pipe (10) are arranged on and describedly have an X-rayed the side being communicated with the first end away from described first connecting pipe (10) of position of managing (30) and described first connecting pipe (10).
7. oil pumping unit reduction gearbox liquid level gauge according to claim 5, it is characterized in that, described control piece (52) is core bar, described core bar is plugged in described first connecting pipe (10) from the second end of described first connecting pipe (10), and described core bar controls described sampling pipe (51) along the length direction to-and-fro movement of described first connecting pipe (10) and is communicated with the part with fluid of described first connecting pipe (10) or disconnects.
8. oil pumping unit reduction gearbox liquid level gauge according to claim 7, it is characterized in that, the pore inwall of the second end of described first connecting pipe (10) is provided with internal thread (11), and one end of the first end away from described first connecting pipe (10) of described core bar is provided with the external thread (521) coordinated with described internal thread (11).
9. oil pumping unit reduction gearbox liquid level gauge according to claim 7, it is characterized in that, one end of the first end of close described first connecting pipe (10) of described core bar is arranged with O-ring seal (53), when the part with fluid of described sampling pipe (51) and described first connecting pipe (10) disconnects by described core bar, described O-ring seal (53) is positioned at described perspective and manages (30) and be communicated with position with described first connecting pipe (10) and between described sampling pipe (51) and described first connecting pipe (10) link position.
10. oil pumping unit reduction gearbox liquid level gauge according to claim 7, it is characterized in that, described sampling assemble (50) also comprises control lever (54), described control lever (54) be arranged on the first end away from described first connecting pipe (10) of described core bar side and perpendicular to described core bar.
CN201420740493.8U 2014-11-28 2014-11-28 Reduction box liquid level meter of oil pumping unit Expired - Fee Related CN204346540U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420740493.8U CN204346540U (en) 2014-11-28 2014-11-28 Reduction box liquid level meter of oil pumping unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420740493.8U CN204346540U (en) 2014-11-28 2014-11-28 Reduction box liquid level meter of oil pumping unit

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Publication Number Publication Date
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105021251A (en) * 2015-07-31 2015-11-04 山东能源重装集团中传矿用设备制造有限公司 Oil level gauge and speed reducer comprising same
CN109931035A (en) * 2019-04-12 2019-06-25 江苏华安科研仪器有限公司 The explosion-proof hot-water heating watering-type chemicals dosing plant of continuous type oil well

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105021251A (en) * 2015-07-31 2015-11-04 山东能源重装集团中传矿用设备制造有限公司 Oil level gauge and speed reducer comprising same
CN105021251B (en) * 2015-07-31 2018-07-27 山东能源重装集团中传矿用设备制造有限公司 A kind of oil level indicator and the retarder comprising the oil level indicator
CN109931035A (en) * 2019-04-12 2019-06-25 江苏华安科研仪器有限公司 The explosion-proof hot-water heating watering-type chemicals dosing plant of continuous type oil well

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Granted publication date: 20150520