CN107304036A - For performing the method changed oil within the engine and the instrument for filling oil to engine - Google Patents
For performing the method changed oil within the engine and the instrument for filling oil to engine Download PDFInfo
- Publication number
- CN107304036A CN107304036A CN201610247865.7A CN201610247865A CN107304036A CN 107304036 A CN107304036 A CN 107304036A CN 201610247865 A CN201610247865 A CN 201610247865A CN 107304036 A CN107304036 A CN 107304036A
- Authority
- CN
- China
- Prior art keywords
- engine
- oil
- measurement probe
- filling
- instrument
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/04—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes for transferring fuels, lubricants or mixed fuels and lubricants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
- B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
- B67D7/00—Apparatus or devices for transferring liquids from bulk storage containers or reservoirs into vehicles or into portable containers, e.g. for retail sale purposes
- B67D7/06—Details or accessories
- B67D7/08—Arrangements of devices for controlling, indicating, metering or registering quantity or price of liquid transferred
- B67D7/30—Arrangements of devices for controlling, indicating, metering or registering quantity or price of liquid transferred with means for predetermining quantity of liquid to be transferred
-
- 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
- F01M11/0458—Lubricant filling and draining
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
Abstract
It is used to perform the method changed oil in engine (10) the present invention relates to a kind of, the described method comprises the following steps：A) waste oil is suctioned out from the engine (10)；B) fill adapter (11) is made to be connected to the entrance (12) of the engine (10)；C) measurement probe (17) is made to imported into the engine (10)；D) oil is filled to the engine (10) by the fill adapter (11)；And e) terminate filling when the measurement probe (17) configured in the engine (10) detects predetermined fill liquid level.The invention further relates to a kind of instrument (1) for being used to fill oil to engine (10).
Description
Technical field
It is used to give engine filling the present invention relates to a kind of method changed oil and one kind being used to perform within the engine
The instrument of oil, the instrument has：The fuel tank of charge of oil, fill adapter can be transported to from the fuel tank by pump by oil；Visited with measurement
Pin, the measurement probe can be directed in engine.
Background technology
US7207418B2 discloses a kind of machine for being used to fill to speed changer motor, and the machine is on hookup wire
Set for filling first.In the filling first of speed changer motor, loading liquid level measurement is additionally performed, to keep away
Exempt from filling excessively or filling is not enough.Therefore filling process repeatedly can one after the other be performed for same speed changer motor.No
Cross, the machine is not set for workshop, is changed oil to perform.In workshop, many differences are one after the other given when changing oil
Engine oil change, this makes it necessary to that the adding amount of each filling process is adjusted.
It is well known that, in the car when changing oil, generally the oil pump contained in engine is gone out and then filled again.To hair
Motivation filling oil can be carried out manually, but this easily malfunctions.If started containing oily engine very little, this can cause
Problem, wherein, the loading liquid level controller of automobile sends signal.If on the contrary be injected into too many oil in engine, this
By vehicle is not detected as mistake, and may occur serious engine damage.What is also existed in manual filling asks
Topic is, so that just the oil for the lucky high viscosity saved fuel oil and applied can be measured at the filling height only above oil dipstick
It is worse.Therefore, in order to be used in workshop, manual filling process is due to easily malfunctioning without meaning.Now it is also contemplated that
That better a variety of engine oils must be ready in workshop, and automobile adding amount according to engine
It is different.
The content of the invention
Therefore, task of the invention is to provide a kind of method and instrument, this method and instrument for being used to fill oil to engine
Device make it that automatically filling is oily and reduces the easy error in filling process.
The task is the method and a kind of spy with claim 5 using a kind of characteristic with claim 1
The instrument of part is levied to complete.
According to the present invention, being suctioned out from engine, waste oil is delayed, make first fill adapter connection, preferably locking or
It is clamped to the entrance of engine.In addition, making measurement probe imported into engine before this or after this.And then,
Oil is filled into by fill adapter in engine, and go out predetermined fill in in-engine measurement probe in detecting when configuring
During liquid level, terminate filling.Therefore, loading liquid level control can be carried out by measuring probe, so as to avoid adding for engine
Note is excessive.Accordingly it is also possible to which the filling that engine is excluded when not performing previous waste oil when changing oil fully and suctioning out is excessive.
Under any circumstance, measurement probe can terminate filling process when reaching predetermined fill liquid level.
In order to reduce the easy error in terms of the positioning of measurement probe within the engine, measurement probe is preferably inserted into
In guide pipe on to engine.Thus, measurement probe can be configured in engine with high positioning precision.
In another design of the present invention, for example oil flow is performed by starting engine after filling process is terminated
Journey, to fill oil to engine by fill adapter in a further step again.When measurement probe in detecting goes out than first
Terminate the filling according to another step during the high predetermined fill liquid level of loading liquid level after secondary filling process.Add in first time
Filling during fluid injection position can be with the filling speed higher than in second of filling process, especially with least double filling speed
Degree is carried out.This this have the advantage that, can more accurately detect loading liquid level.In first time filling process, can for example it select
1 to 10 liter/min of transporting velocity is selected, and 1 liter/min to 2 liters/min of conveying speed is only applied in second of course of conveying
Degree.When conveying capacity can be second of course of conveying in first time course of conveying it is at least double it is so big, preferably three times
It is so big above, thus allow for effective automatic filling.
Alternatively, oily allocation flow can be abandoned., can during the oil filter especially dallied when using in engine stop
To abandon oily allocation flow, changed oil particularly effectively to perform.These oil filters can only be operated by one in engine
When the oil pump that works circulated, such as because the configuration of these oil filters is in the top of in-engine liquid level.Thus, oil filter quilt
Automatic-discharging.Only after oil filter emptying, filling again for engine is just carried out.
For especially accurate filling process, can terminate filling to engine oil after or when, suction out pre-
Determine the oil of the top of loading liquid level.It is possible thereby to safely avoid the filling of engine excessive.
According to another design, the oily suction catheter of the top for suctioning out predetermined fill liquid level is provided with, and lead to
The pressure change crossed on detection suction catheter can terminate filling.Thus, suction catheter is used as induction pieces or sensor, so as to right
Reach that predetermined fill liquid level is detected.Additionally, suction catheter can be suctioned out at the end of filling in the top of loading liquid level
Unnecessary oil, this especially in the disconnection of pump oil wake flow when occur.
According to the instrument for being used to fill oil, especially engine oil to engine of the present invention, the instrument has：Charge of oil
Fuel tank, fill adapter can be transported to from the fuel tank by pump by oil；With measurement probe, the measurement probe, which can be directed to, to be started
In machine.Now, measurement probe is connected to controller, and engine is terminated when detecting predetermined fill liquid level by the controller
Filling.Thus, it is possible to perform filling process automatically by the instrument when changing oil.
According to the present invention, the insertion depth of measurement probe is adjustable.For different engines, change insertion
Depth can be necessary, thus measure probe and detect desired filling height exactly according to engine type.Therefore, can be
Corresponding governor motion or regulation driver are set in the maintaining part for measuring probe.Measurement probe, which is preferably inserted into, to be started
In guide pipe on machine, to ensure being accurately positioned in engine interior.
Preferably, measurement probe can be fixed on the engine by maintaining part.Now, measurement probe can clampingly, card
Surely or by other fixing means fix on the engine, therefore the measurement probe accurate positioning be configured.
When measuring probe with being used to measure in multiple induction pieces of in-engine loading liquid level, it can perform many
Filling process in individual course of conveying, this make it that liquid level is steady and make it that detectability is more preferable.
In order to terminate course of conveying, the pump for conveying oil can be disconnected by controller.Altematively or additionally, energy
Enough valves disconnected by controller before the outlet of fill adapter, so as to instantaneously terminate in the range of fill adapter
Filling process.
Preferably, it is provided with for suctioning out the oily suction catheter in the top of predetermined fill liquid level, to terminate to give
During engine filling oil, oil is suctioned out from engine when more than predetermined fill liquid level.This causes one kind is particularly accurate to add
Note process is possibly realized, and the oil of wake flow can also be suctioned out in the filling process to be used to ensure predetermined fill liquid level.
Brief description of the drawings
The present invention is described in more detail referring to the drawings below according to embodiment.In the accompanying drawings：
Fig. 1 is the schematic diagram for being used to fill the instrument of oil to container according to the present invention；
Fig. 2 is the detailed figure of Fig. 1 container with measurement probe；
Fig. 3 is the schematic diagram for being used to fill the instrument of oil to container according to another embodiment according to the present invention；
Fig. 4 is the stereogram of the instrument according to the present invention according to Fig. 3；And
Fig. 5 is that the amplification of Fig. 3 measurement probe is schemed in detail.
Embodiment
Instrument 1 for filling oil to container such as engine 10 includes fuel tank 2, and the fuel tank 2 is movably disposed in branch
On frame 3.Therefore, roller 4 is provided with the downside of support 3, so that instrument 1 can be moved to vehicle for filling process.This
When, fuel tank 2 can have the capacity for example between 40 liters and 100 liters.
Power supply unit 5 is additionally provided with support 3, the power supply unit 5 includes rechargeable battery, so as to ought not connect
During to power network, filling process can also be performed.Instrument 1 also includes controller, and the controller has indicator 6 and input area 7.
Oil from fuel tank 2 can be transported to by fill adapter 11 by flexible pipe 9 by pump 8.Now, fill adapter 11
It can be such as fixed on the sleeve pipe 12 of engine 10 by clamp system or locking mechanism.
Instrument 1 also includes measurement probe 17, and the measurement probe 17 may equally be well connected on engine 10 and by least one
Root pilot 16 is connected with the controller of instrument 1.
Include probe tube 19 as also can be seen that measurement probe 17 from Fig. 2 amplification diagram, the probe tube 19 is inserted into
In guide pipe 20 on to engine 10.Engine 10 preferably refers to the engine only schematically shown.Pass through guide pipe 20
Probe tube 19 can be closely guided to the desired locations inside engine 10, wherein, probe tube 19 can also be bent.Probe
The tip 18 of pipe 19 includes the one or more induction pieces for being used to detect loading liquid level.Preferably, it is provided with probe tube 19
Multiple induction pieces for detecting different loading liquid levels.
Probe tube 19 is fixed on engine 10 by maintaining part 21, wherein, maintaining part 21, which has, is used for probe tube 19
At least one backstop being accurately positioned, but also other secure component, such as clamp system can be set.
Measurement probe 17 also has the governor motion 22 schematically shown, and probe tube 19 is can adjust by the governor motion 22
Insertion depth.Thus, it is possible to change the insertion depth in the probe tube 19 of the inside of engine 10 according to engine type.Refer to
Show that device 24 can indicate the position of probe tube and/or the submergence of induction pieces 18.
Measurement probe 17 is also connected on support 3 by connector 23 and pilot 16 with controller, so that in detection
When going out predetermined fill liquid level, controller 6 can disconnect pump 8.Additionally or alternatively, valve and fill adapter 11 can also be made
Connect, so as to terminate injection process at once.
For filling process, fill adapter 11 is set to be connected on the sleeve pipe 12 of engine 10 first.Before this
Or the measurement probe 17 with probe tube 19 is inserted into guide pipe 20 and is fixed in maintaining part 21 after this.Needing
When wanting, it can manually or automatically change the insertion depth of probe tube 19 by driver by governor motion 22.And then may be used
So that oil is transported in engine 10 from fuel tank 2 by flexible pipe 9, wherein, the oil 14 schematically shown is gathered in engine 10
Bottom simultaneously and then rises.Now, transporting velocity can be between 1 liter/min to 10 liters/min, especially at 2 liters/min to 6
Between liter/min, so as to carry out the smooth filling of engine 10.
There are two possibilities for the end of injection process.Alternatively, injection rate is stored in the controller of instrument 1
And can be therefore measured by controller and pump 8.Then the oil pump of desired amount can be sent in engine 10, and up to
Terminate filling process after to adding amount.In this case, measurement probe 17 is used to ensure, when engine 10 is not emptied completely
Avoid filling excessive, because measurement probe 17 can send signal to controller when detecting predetermined fill liquid level, thus
The controller interrupts filling process at once, even if the adding amount that also not up to ought be stored in controller is also such.Then, lead to
Cross the measured probe 17 of controller and terminate filling process.
Preferably, filling process is performed step by step by two step by step, especially as multiple, wherein, in first time plus
After note process, oily allocation flow is started by way of making engine 15 and moving, so as to realize oil 14 in engine interior
Expect distribution.It is then possible to fill oil again in second of filling process, wherein, controller can also add at second
Adding amount is predefined during note process.Then, engine 10 expects oil mass in second of filling process by filling, and then certainly
Dynamic circuit breaker is opened.Measurement probe 17 also prevents filling excessive in second of filling process, because once detecting predetermined fill height,
Measurement probe 17 just terminates filling process.
It can also accomplish, be entered when always detecting predetermined fill height when filling excessive by measuring probe 17
Row disconnects and injection rate is not stored in the data storage of controller.However, storage and the measurement probe 17 of adding amount
It is additional use so as to filling error preventing property be improved.
Filling process in the second step is with the transporting velocity of reduction, especially with about 1 liter/min to 2 liters/min
Speed perform.It is hereby achieved that raising of the oil 14 in the measurement accuracy for optimizing distribution and liquid level of engine interior.
Adding amount of the storage for the different engine types of automobile in the controller of instrument 1.Additionally, it can also deposit
Storage is dependent on automobile or the insertion depth for measurement probe 19 of engine type.Then it can manually or also can lead to automatically
Overdrive device and by controller predefine measurement probe 17 insertion depth, to avoid the mistake in filling process.
For new automobile or change, the data group in the memory of controller can be changed correspondingly.Alternatively, may be used also
To take out adding amount and regulated value from regulation list and be manually entered into controller.
Figure 3 illustrates the second embodiment of the instrument 1 ' for filling oil to engine 10, wherein, identical component
Represented using with the same reference numbers in Fig. 1.Instrument 1 ' includes fuel tank 2, from the fuel tank 2 by pump and flexible pipe 9 can by oil that
The fluid of sample is transported to the injection spray gun with fill adapter 11 ', and the fill adapter 11 ' may be connected to the sleeve pipe of engine
12’.Engine 10 includes engine speed changer 15, and oil 14 should be injected into the engine speed changer 15 until predetermined fill liquid
Position.
In order to detect loading liquid level, probe tube 19 is provided with, the probe tube 19 is inserted into the guide pipe on engine 10
In 20.Probe tube 19 will with tip 18 so positioning, i.e. tip 18 mark fuel-displaced 14 should be injected into until predetermined fill liquid
Position.Now, probe tube 19 is positioned on wall section 25 by retainer 26 and can be high in the difference relative to retainer 26
Degree is positioned by mobile.Indicator 27 indicates, which kind of height or which kind of liquid level are attached to the tip 18 of probe tube 19, this according to
Rely and change in engine type or probe tube 19 relative to the adjusting position of retainer 26.
Different from first embodiment, being constituted on probe tube has tip 18 as suction tube, and the suction tube, which is connected to, to be taken out
Inhale conduit 28.Suction catheter 28 is connected by suction pump 30 and backhaul guiding catheter 31 with collection vessel 33.In addition, with aspirating
Suction catheter 28 between pump 30 and probe tube 19 is connected with pressure sensor 29, the pressure sensor 29 by wire size line 32 with
The controller connection of instrument 1 '.
In order to start filling process, start the unshowned pumps 8 of Fig. 3 for conveying oil and suction pump 30.Suction pump 30
Produce the negative pressure in suction catheter 28 and probe tube 19.Injected oil into by flexible pipe 9 in engine 10., until probe tube 19
Tip 18 reach oil level.By oil phase is higher for the air viscosity sucked, in probe tube 19 and suction catheter 28
Negative pressure is raised.The pressure rise is detected by pressure sensor 29 and is passed to controller by signal wire 32, therefore
Pump 8 can be disconnected.It can happens is that due to temporal delay, in more oil wake flows to engine 10 and more than maximum
Allow oil level.By suctioning out oil via the tip 18 on probe tube 19 and suction catheter 28, oil can be sucked and its backhaul is led
To in collection vessel 33.The oil sucked must be eliminated later.Therefore ensure that, the filling for carrying out engine 10 is only straight
To maximum allowable adding amount, tip 18 of the maximum allowable filling gauging probe tube 19 is limited.
Figure 4 illustrates a kind of instrument for being used to fill oil to engine 10, the instrument works according to Fig. 3 schematic diagram.
The fuel tank 2 equipped with fresh oil is configured with the support 3 of instrument, wherein, not only it is configured with moveable instrument for conveying
The pump 8 of fresh oil, and suction pump 30 is configured with, by the suction pump 30 and oil is aspirated by suction catheter 28.In addition, in instrument
On be provided with pressure switch 34, the pressure switch 34 is connected with suction catheter 28, so as to when pressure is flown up pass through control
Device is acted, i.e. disconnect pump 8.Collection vessel 33 is additionally provided with the support 3 of instrument, backhaul guiding catheter 31 leads to this
In collection vessel 33.It is additionally provided with the battery 35 for operating 8 and suction pump 30 and controller.Thus, it is possible to make instrument
Being moved to automobile as mobile unit is used to change oil.
Fig. 5 shows probe tube 19, and the probe tube 19 is arranged on guide pipe 20 by retainer 26.Retainer 26 and shoe tree
The Measurement scales 36 of shape are connected, and can move indicator 27 along Measurement scales 36, and the indicator 27 is connected with probe tube 19.
Thus, it is possible to which the insertion depth for adjusting probe tube 19 is used to determine maximum loading liquid level.
In the illustrated embodiment, probe tube 19 is movably arranged on retainer 26.It can also set with difference
Regular length multiple probe tubes, these probe tubes and then longitudinally laid and for the engine for engine type
Type is used.
Reference marker list
1,1 ' instrument
2 fuel tanks
3 supports
4 rollers
5 power supply units
6 indicators
7 input areas
8 pumps
9 flexible pipes
10 engines
11,11 ' fill adapters
12,12 ' sleeve pipes
14 oil
15 engines
16 pilots
17 measurement probes
18 tips
19 probe tubes
20 guide pipes
21 maintaining parts
22 governor motions
23 connectors
24 indicators
25 wall sections
26 retainers
27 indicators
28 suction catheters
29 pressure sensors
30 suction pumps
31 backhaul guiding catheters
32 signal wires
33 collection vessels
34 pressure switches
35 batteries
36 Measurement scales
Claims (13)
1. one kind is used to perform the method changed oil in engine (10), it the described method comprises the following steps：
A) waste oil is suctioned out from the engine (10)；
B) fill adapter (11) is made to be connected to the entrance (12) of the engine (10)；
C) measurement probe (17) is made to imported into the engine (10)；
D) oil is filled to the engine (10) by the fill adapter (11)；And
E) when the measurement probe (17) when configuration in the engine (10) detects predetermined fill liquid level, terminate to add
Note.
2. according to the method described in claim 1, it is characterised in that the measurement probe (17) is inserted into the engine
(10) in the guide pipe (20) on.
3. method according to claim 1 or 2, it is characterised in that after terminating to the engine (10) filling oil
Or when, suction out the oil in the top of the predetermined fill liquid level.
4. the method according to any one of the claims, it is characterised in that be provided with for suction out it is described predetermined plus
The oily suction catheter (28) of the top of fluid injection position, and terminated by detecting the pressure change on the suction catheter (28)
Filling.
5. one kind is used for the instrument that oil is filled to engine (10), the instrument has：The fuel tank (2) of charge of oil, from the fuel tank
(2) oil can be transported to by pump (8) by fill adapter (11)；With measurement probe (17), the measurement probe (17) can be led
Enter into the engine (10), wherein, the measurement probe (17) is connected to controller, is being detected by the controller
Terminate the filling of the engine (10) during predetermined fill liquid level, it is characterised in that the insertion depth of the measurement probe (17)
It is adjustable.
6. instrument according to claim 5, it is characterised in that the measurement probe (17) can be fixed by maintaining part (21)
On the engine (10).
7. the instrument according to any one of claim 5 or 6, it is characterised in that the measurement probe (17) is inserted into
In guide pipe (20) on the engine (10).
8. the instrument according to any one of claim 5 to 7, it is characterised in that the measurement probe (17), which has, to be used for
Measure multiple induction pieces of the different loading liquid levels in the engine (10).
9. the instrument according to any one of claim 5 to 8, it is characterised in that can be disconnected by the controller is used for
Convey the pump (8) of oil.
10. the instrument according to any one of claim 5 to 9, it is characterised in that can be disconnected in institute by the controller
State the valve of the outlet upstream of fill adapter (11).
11. the instrument according to any one of claim 5 to 10, it is characterised in that the controller has data storage
Device, has the different adding amounts for different car categories, and have selected car category in the data storage memory storage
Afterwards, filling process is terminated automatically at least in part.
12. the instrument according to any one of claim 5 to 11, it is characterised in that be provided with suction pump (30) and suction
Conduit (28), to terminate to start in the case of to the engine (10) filling oil from described when more than predetermined fill liquid level
Oil is suctioned out in machine (10).
13. instrument according to claim 12, it is characterised in that the pressure rise on the suction catheter (28) passes through pressure
Force snesor (29) is detected and is passed to controller by signal wire (32), to disconnect the pump (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610247865.7A CN107304036A (en) | 2016-04-20 | 2016-04-20 | For performing the method changed oil within the engine and the instrument for filling oil to engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610247865.7A CN107304036A (en) | 2016-04-20 | 2016-04-20 | For performing the method changed oil within the engine and the instrument for filling oil to engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107304036A true CN107304036A (en) | 2017-10-31 |
Family
ID=60151678
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610247865.7A Pending CN107304036A (en) | 2016-04-20 | 2016-04-20 | For performing the method changed oil within the engine and the instrument for filling oil to engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107304036A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578573A (en) * | 2019-09-24 | 2019-12-17 | 烟台职业学院 | Anti-pollution and environment-friendly engine oil extraction metering device |
-
2016
- 2016-04-20 CN CN201610247865.7A patent/CN107304036A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578573A (en) * | 2019-09-24 | 2019-12-17 | 烟台职业学院 | Anti-pollution and environment-friendly engine oil extraction metering device |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171031 |
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| WD01 | Invention patent application deemed withdrawn after publication |