CN109734037A - A kind of diesel-engine tester fuel oil supply system - Google Patents
A kind of diesel-engine tester fuel oil supply system Download PDFInfo
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- CN109734037A CN109734037A CN201811472057.6A CN201811472057A CN109734037A CN 109734037 A CN109734037 A CN 109734037A CN 201811472057 A CN201811472057 A CN 201811472057A CN 109734037 A CN109734037 A CN 109734037A
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Abstract
The present invention provides a kind of diesel-engine tester fuel oil supply systems.The system includes: storage tank；High-order fuel tank can conductively be connect with storage tank；Daily fuel tank is used for engine oil, and daily diesel fuel tanks can conductively be connect with high-order fuel tank, and high-order fuel tank is higher than daily fuel tank and is arranged so that the pressure that high-order fuel tank is generated using gravity, is the daily fuel tank repairing of each test(ing) plant；And volume control device, it is arranged in daily fuel tank, is injected into the fuel flow rate in daily fuel tank for controlling high-order fuel tank according to the fuel liquid level in daily fuel tank.Diesel-engine tester fuel oil supply system of the invention uses gravity type fuel system, and charge oil pressure is relatively stable, is not necessarily to manual intervention, it is convenient to facilitate.
Description
Technical field
The present invention relates to marine diesel fields, and in particular to a kind of diesel-engine tester fuel oil supply system.
Background technique
The main fuel of current various internal combustion engines is still fuel oil, especially diesel oil.Each manufacturing enterprise or R & D Enterprises, in order to
Engine to be developed or produced, the multiple test bench locations of construction are typically necessary, this results in the pilot production workshop quantity needed more,
Occupied area is larger.Meanwhile fuel oil belongs to inflammable and explosive class article again, and safe distance, unified pipe are just considered at the beginning of construction
The fire prevention measures such as reason.This results in the storage location of fuel oil, and at a distance from test(ing) plant farther out, the prior art generally passes through pre-buried
Pipeline is attached with each test(ing) plant.
In addition, test(ing) plant needs continuous operation more than ten hour under normal conditions, for the enterprise of some research and development classes, examination
Testing the time is even more to be up to thousands of hours, and is 24 hours continuous operations, and this requires fuel oil storage location can be continual
Fuel oil is supplied for test(ing) plant, and is needed in each test(ing) plant, day needed for arrangement can satisfy certain time operation
Use fuel tank.In particular for the block testing stand of long period test, selfoiling system can reduce the work of staff
Safety when measuring, while also ensuring fuel oil automatic filling.
Therefore, it is necessary to a kind of diesel-engine tester fuel oil supply system be proposed, at least to be partially solved the prior art
Present in the above problem.
Summary of the invention
At least partly to solve above-mentioned technical problem, the purpose of the present invention is to provide a kind of diesel-engine tester fuel oils
Feed system, comprising:
Storage tank；
High-order fuel tank can conductively be connect with storage tank；
Daily fuel tank, for engine oil, the daily diesel fuel tanks can conductively to connect with the high-order fuel tank
It connecing, the high position fuel tank is higher than the daily fuel tank and is arranged so that the pressure that the high position fuel tank utilizes gravity to generate,
For the daily fuel tank repairing of each test(ing) plant；And
Volume control device is arranged in the daily fuel tank, for according to the fuel oil liquid in the daily fuel tank
The control high-order fuel tank in position is injected into the fuel flow rate in the daily fuel tank.
In embodiments, comprising:
High-order fuel tank liquid level sensor, setting is in the high-order fuel tank, for sensing in the high-order fuel tank
The first fuel liquid level；And
Fuel oil refueling pump, setting between the storage tank and the high-order fuel tank and with the high-order fuel tank
Liquid level sensor electrical connection, with when first fuel liquid level is lower than the first predetermined threshold by the fuel oil in the storage tank
It is injected into the high-order fuel tank.
In embodiments, the volume control device includes ball-cock assembly and/or liquid level motor-operated control valve.
In embodiments, the ball-cock assembly includes:
Valve rod, one end of the valve rod are pivotally installed on the inner wall of the daily fuel tank；
At least one floating ball, the floating ball are set on the valve rod, liquid level of the floating ball because of the daily fuel tank
Change and the valve rod is driven to swing, and then controls the high-order fuel tank and be injected into the fuel stream in the daily fuel tank
Amount.
In embodiments, comprising:
Daily fuel tank liquid level sensor is arranged in the daily fuel tank, for sensing in the daily fuel tank
The second fuel liquid level；And
Hand stop valve is arranged on the pipeline between the high-order fuel tank and the daily fuel tank.
In embodiments, comprising:
Electric check valve is arranged on the pipeline between the hand stop valve and the high-order fuel tank, described electronic
Shut-off valve is electrically connected with the daily fuel tank liquid level sensor, when second fuel liquid level is higher than the second predetermined threshold
Cut-off.
In embodiments, comprising:
Support frame, the high position fuel tank setting make the high-order fuel tank be higher than the daily fuel oil on the support frame
Case setting.
In embodiments, the daily fuel tank is multiple, and multiple daily fuel tanks are connected in parallel.
In embodiments, the high-order fuel tank further includes overflow oil pipe, the overflow oil pipe and the storage tank
Connection, so that not having fuel leakage when the fuel oil refueling failure of pump.
In embodiments, height of the high-order fuel tank apart from ground is 15 to 25 meters.
Diesel-engine tester fuel oil supply system of the invention uses gravity type fuel system, and charge oil pressure is relatively stable,
Without manual intervention.Daily fuel tank in each test(ing) plant is small in size, cleaning is convenient, does not need construction overflow oil pipe,
It reducings the construction costs.The oil inlet quantity of daily fuel tank is controlled using ball-cock assembly, has not only been able to satisfy engine test demand, but also can make day
It is less with the trapped fuel amount of fuel tank, meet the requirement of fire codes；High-order volume of fuel tank is big, can meet the hair on multiple positions
The fuel feeding of motivation long period avoids gasoline pump frequent start-stop.
A series of concept of reduced forms is introduced in Summary, this will in the detailed description section into
One step is described in detail.Summary of the invention is not meant to attempt to limit technical solution claimed
Key feature and essential features do not mean that the protection scope for attempting to determine technical solution claimed more.
Detailed description of the invention
Following drawings of the invention is incorporated herein as part of the present invention for the purpose of understanding the present invention.Shown in the drawings of this hair
Bright embodiment and its description, principle used to explain the present invention.In the accompanying drawings,
Fig. 1 is a kind of structure chart for diesel-engine tester fuel oil supply system that the embodiment of the present invention provides；
Fig. 2 is a kind of knot of the high-order fuel tank for diesel-engine tester fuel oil supply system that the embodiment of the present invention provides
Structure and dimensional drawing；And
Fig. 3 is a kind of knot of the daily fuel tank for diesel-engine tester fuel oil supply system that the embodiment of the present invention provides
Structure and dimensional drawing.
Specific embodiment
In the following description, a large amount of concrete details are given so as to provide a more thorough understanding of the present invention.So
And it will be apparent to one skilled in the art that the present invention may not need one or more of these details and be able to
Implement.In other examples, in order to avoid confusion with the present invention, for some technical characteristics well known in the art not into
Row description.
Fig. 1 is a kind of structure chart for diesel-engine tester fuel oil supply system that the embodiment of the present invention provides.Such as Fig. 1 institute
Show, which may include: that storage tank 1, high-order fuel tank use fuel tank 7, ball-cock assembly 8 (as " volume control device on the 3rd
An example ").
Specifically, storage tank 1 can be set outside test(ing) plant, with biggish volume, can store more combustion
Oil can be used for high-order 3 fuel feeding of fuel tank.Storage tank 1 can be to be multiple, and multiple storage tanks 1 can pass through pipeline string
Join or be connected in parallel, and then can be for a long time to high-order 3 fuel feeding of fuel tank.
High-order fuel tank 3 can be set aloft, for example, a support frame 11 can be set, the high-order setting of fuel tank 3 is being propped up
On support 11, so that it can be set at the certain altitude of ground.For example, height of the high-order fuel tank apart from ground can
Think 15 to 25 meters.The pressure that fuel oil in high-order fuel tank 3 can be generated using gravity, is the daily fuel oil of each test(ing) plant
7 repairing of case is not necessarily to manual intervention, it is convenient to facilitate so that charge oil pressure is relatively stable.Optionally, high-order fuel tank 3 and oil in reserve
Fuel oil refueling pump 2 can be set between tank 1.When the amount of fuel in high-order fuel tank 3 is lower than preset a certain standard, fuel oil
Fuel oil in storage tank 1 can be injected into high-order fuel tank 3 by gasoline pump 2.For example, can be set on high-order fuel tank 3
There is a high-order fuel tank liquid level sensor 4, which is used to sense first in high-order fuel tank 3
Fuel liquid level.High-order fuel tank liquid level sensor 4 can be pumped with fuel oil refueling and 2 is electrically connected, to be lower than in the first fuel liquid level or
The fuel oil in storage tank 1 is injected into high-order fuel tank 3 when equal to the first predetermined threshold.Specifically, when high-order fuel tank
When liquid level sensor 4 senses the first fuel liquid level in high-order fuel tank 3 less than or equal to the first reservation threshold, level sensing
Open signal can be directly transferred on fuel oil refueling pump 2 by the control device in device 4, open fuel oil refueling pump 2, fuel oil refueling
Fuel oil in storage tank 1 is pumped into high-order fuel tank 3 by pump 2 in turn；When the fuel liquid level in high-order fuel tank 3 is higher than the
After one predetermined threshold, shutdown signal is directly transferred on fuel oil refueling pump 2 by high-order fuel tank liquid level sensor 4, closes fuel oil
Gasoline pump 2, and then guarantee that the fuel oil in high-order fuel tank 3 can maintain always suitable storage capacity.
High-order fuel tank 3 further includes overflow oil pipe (referring to shown in Fig. 2), connect with storage tank 1, guarantees fuel oil refueling
Fuel leakage is not had when pumping 2 failure, for example, fuel oil refueling can inject fuel oil into high-order fuel tank 3 always when pumping 2 failure,
Excessive fuel oil can flow back to storage tank 1 by overflow oil pipe, and then avoid overflowing due to high-order 3 internal combustion Chuck Steak of fuel tank
Out.Oil pipe of releasing can be set in high-order fuel tank 3.Oil pipe of releasing can install valve in bottom at ground.Cleaning is high-order
When fuel tank 3, can directly it be held with sump oil barrel.Inspection chamber is arranged in the side of fuel tank and top surface, clear convenient for ventilation and fuel tank
Reason.Air hole is arranged in the top of high-order fuel tank 3, and installs air filtering core, can effectively avoid dust impurity from entering a high position
In fuel tank 3, maintenance period is reduced.
Fig. 2 show the primary structure and dimensional drawing of high-order fuel tank 2.The structure design size of high-order fuel tank 3 is main
Have: volume of fuel tank V1, oil inlet pipe diameter D1, fuel-displaced pipe diameter D2, overflow tubing diameter D3, release tubing diameter D4, oil tank bottom
Absolute altitude h0, fuel tank height h1, oiling open height h2, fuel-displaced open height h3, oil overflow open height h4.
Fuel oil refueling pump 2 can be screw pump common in the market, gear pump etc..It as needed can direct type selecting.
Major parameter needed for gasoline pump type selecting is fuel flow Q0, fuel feed pressure P0.The selection principle of Q0 is: Q0 >=1.5 ×
(Q1+Q2+Q3+ ...+Qn), Q1, Q2, Q3, Qn are the maximum fuel consumption of each test(ing) plant engine 10 in formula；P0's
Selection principle is: P0 >=1.05 × h0, and h0 is the oiling open height of high-order fuel tank 3 in formula.Fuel oil refueling pump 2 is typically chosen 2
Platform pump, the using and the reserved guarantee that fuel feeding is uninterrupted.
If the engine test of test(ing) plant needs long-term continuous operation, the inner cavity of high-order fuel tank 3 more with oil mass
It can be set to two and be designed to 2 separate spaces spaced apart from each other.Oil inlet pipe, flowline, overflow oil pipe and oil pipe of releasing,
It is designed as double nip, can guarantee to safeguard on one side in this way, guarantee fuel delivery on one side.
Daily fuel tank 7 can conductively connect with high-order fuel tank 3 and be used for 10 fuel feeding of engine.Daily fuel tank 7
Setting height lower than the setting height of high-order fuel tank 3, and then guarantee that the oil in high-order fuel tank 3 can use height and produce
Raw pressure is with to daily 7 fuel feeding of fuel tank.For example, daily fuel tank 7 can be set on the ground and high-order fuel tank 3 can be set
It sets on higher support frame 11, so that high-order fuel tank 3 is arranged higher than daily fuel tank 7, high-order fuel tank 3 is produced using gravity
Raw pressure is 7 repairing of daily fuel tank of each test(ing) plant.Daily fuel tank 7 can be set in test(ing) plant and wrap
Include multiple, for example, the quantity of daily fuel tank 7 is adapted with the quantity of engine 10, i.e., an engine 10 can correspond to one
A independent daily fuel tank 7.It is of course also possible to two or the shared daily fuel tank 7 of three engines 10.
Specifically, the top surface of daily fuel tank 7 can be designed to cover-plate type, and since volume of fuel tank is smaller, cover board can be by
It is opened manually, facilitates the maintenance and cleaning of equipment.The bottom of daily fuel tank 7, is designed to inclined-plane, facilitates the cleaning of fuel tank.
The oil inlet and oil outlet of daily fuel tank 73, are placed on opposite face, can be reduced in this way since the gas to be formed is impacted in oil inlet
Bubble, into the fuel system of engine 10.The placement location of daily fuel tank 7, can be according to the specific need of each engine 10
It asks, is placed on eminence or lower.The bleed outlet of daily fuel tank 7 can decide whether cloth according to the size of final design fuel tank
Set pipeline of releasing.If volume of fuel tank is smaller, it can be not provided with bleed outlet, directly by manual handling, cleaning.
Ball-cock assembly 8 can be set in daily fuel tank 7.Ball-cock assembly 8 is used for according to the fuel liquid level in daily fuel tank 7
It controls high-order fuel tank 3 and is injected into the fuel flow rate in daily fuel tank 7.Ball-cock assembly 8 specifically includes valve rod (not shown) and extremely
A few floating ball (not shown).One end of valve rod is pivotally installed on the inner wall of daily fuel tank 7.Floating ball is set to valve rod
On.Floating ball is swung due to the liquid level of daily fuel tank 7 changes with ovable valve stem, and then is controlled high-order fuel tank and be injected into daily fuel oil
Fuel flow rate in case.Piping connection can be passed through between daily fuel tank 7 and high-order fuel tank 3.It can be set on pipeline
Hand stop valve 6.Optionally, it is also provided with electric check valve 5 on pipeline, and can also be arranged in daily fuel tank 7
There is daily fuel tank liquid level sensor 9, daily fuel tank liquid level sensor 9 is electrically connected with electric check valve 5.
When test(ing) plant is tested, hand stop valve 6 can be opened, gravity oil is allowed to enter by ball-cock assembly 8
Daily fuel tank 7.When the liquid level of daily fuel tank 7 is lower, the floating ball of ball-cock assembly 8 is in low level at this time, and valve opening is larger, stream
Amount is also big, can satisfy the test demand of engine 10；When the liquid level of daily fuel tank 7 is high, floating ball is increased by buoyancy, together
When oil inlet pipe is closed, reduce fuel supply flow rate；When extreme case, test stops, and without fuel consumption, floating ball can be risen to most
High point, completely closes oil inlet pipe, only micro fuel oil enter daily fuel tank 7 (influenced by 8 sealing performance of ball-cock assembly,
It can not completely close).Therefore, the supply capability of daily fuel tank 7, which can be realized, changes and changes according to the operating condition of engine 10,
To realize automatic repairing, it is not necessarily to manual intervention.When not testing for a long time, hand stop valve 6 need to be only closed.
The main function of electric check valve 5 is: when testing crew due to carelessness, forget close hand stop valve 6 when, it is daily
When fuel tank liquid level sensor 9 senses the second fuel liquid level in daily fuel tank 7 greater than or equal to the second predetermined threshold,
A pick-off signal can be issued to electric check valve 5, electric check valve 5 can be closed in turn, oil inlet pipe is cut off.The same day
When being lower than the second predetermined threshold with 7 liquid level of fuel tank, electric check valve 5 can also be automatically opened, and realize automatic repairing.
Referring to shown in Fig. 3, the structure design size of daily fuel tank 7 mainly has: volume of fuel tank V2, oil inlet pipe diameter D5, go out
Tubing diameter D6, 8 latus rectum D of ball-cock assembly7, 8 floating ball diameter D of ball-cock assembly8, fuel tank length L, fuel tank width K, fuel tank height h5, oil inlet
Pipe height h6.Oil inlet pipe diameter D5: D5Size and the maximum fuel consumption of test(ing) plant intrinsic motivation 10, high-order fuel tank 3
Heights of roofs it is related.
In formula: Qn is in a certain test(ing) plant, and maximum fuel the consumption m3/h, g of engine 10 are acceleration of gravity, are taken
9.8m/s2。
H0 and h1 is the relevant parameter for the high-order fuel tank 3 being mentioned above.After the size of D5 is calculated, by circle
It is whole, the size of common pipeline latus rectum is taken, it is bigger than calculated result.
The ball-cock assembly 8 usually directly bought in the market can satisfy the requirement of buoyancy overcoming input pressure.If calculating knot
The case where fruit shows, the buoyancy of floating ball cannot overcome input pressure, cause ball-cock assembly 8 that can not completely close appearance, then can adopt
It realizes using the following method；Daily fuel tank 73 is designed to longer shape, while increasing the length of 8 valve rod of ball-cock assembly, makes to float
The center of ball is remote as far as possible；Or on ball-cock assembly 8, increase multiple floating balls, to increase buoyancy.
8 latus rectum D7 of ball-cock assembly: the latus rectum of ball-cock assembly 8, due to being influenced by movement mechanism, entrance has necking, necking
Through-flow diameter should keep consistent with oil inlet pipe diameter, i.e. D7=D5.The size of the floating ball diameter D8:D8 of ball-cock assembly 8 mainly with
Input pressure is related.
In formula: L1 is 8 piston portion of ball-cock assembly at a distance from fulcrum；L2 be 8 floating ball centre distance fulcrum of ball-cock assembly away from
From.
The diameter and oil inlet pipe diameter of fuel-displaced pipe diameter D6:D6 is consistent, i.e. D6=D5.Fuel tank length L: length
L is selected according to selected 8 length of ball-cock assembly, reserves installation space.Fuel tank width K: width K is according to selected ball-cock assembly
8 floating ball diameter selection, generally takes K=(2 ∽ 3) × D7.The length of the size of fuel tank height h5:h5 and selected ball-cock assembly 8
Degree is consistent.The size of oil inlet open height h6:h6 takes the half of fuel tank height, h6=0.5 × h5.In addition, fuel oil is certainly
Other equipment in dynamic loading system, such as manually-operated gate, electric check valve 5, liquidometer, sensor, according to above-mentioned determination
Parameter, can diameter carry out type selecting buying on the market.
It should be noted that, although in the above-described embodiment, showing one of ball-cock assembly as volume control device
Example, but in unshowned other embodiments, volume control device is also possible to liquid level motor-operated control valve, have with
The identical function of ball-cock assembly, operator can account for selecting according to actual use demand, cost requirement etc..
In summary content can be seen that diesel-engine tester fuel oil supply system of the invention using gravity type fuel feeding
Mode, charge oil pressure is relatively stable, is not necessarily to manual intervention.Small in size, the cleaning side of daily fuel tank 7 in each test(ing) plant
Just, construction overflow oil pipe is not needed, is reducingd the construction costs.The oil inlet quantity of daily fuel tank 7, Ji Nengman are controlled using ball-cock assembly 8
Sufficient engine 10 tests demand, and the trapped fuel amount of daily fuel tank 7 can be made less, meets the requirement of fire codes；High-order fuel oil
3 volume of case is big, can meet the fuel feeding of 10 long period of engine on multiple positions, avoid gasoline pump frequent start-stop.
The present invention has been explained by the above embodiments, but it is to be understood that, above-described embodiment is only intended to
The purpose of citing and explanation, is not intended to limit the invention to the scope of the described embodiments.Furthermore those skilled in the art
It is understood that the present invention is not limited to the above embodiments, introduction according to the present invention can also be made more kinds of member
Variants and modifications, all fall within the scope of the claimed invention for these variants and modifications.Protection scope of the present invention by
The appended claims and its equivalent scope are defined.
Claims (10)
1. a kind of diesel-engine tester fuel oil supply system characterized by comprising
Storage tank；
High-order fuel tank can conductively be connect with storage tank；
Daily fuel tank, for engine oil, the daily diesel fuel tanks can conductively to be connect with the high-order fuel tank, institute
It states high-order fuel tank and is higher than the daily fuel tank setting so that the pressure that the high position fuel tank utilizes gravity to generate, is described
Daily fuel tank repairing；And
Volume control device is arranged in the daily fuel tank, for according to the fuel liquid level control in the daily fuel tank
Make the fuel flow rate that the high-order fuel tank is injected into the daily fuel tank.
2. diesel-engine tester fuel oil supply system according to claim 1 characterized by comprising
High-order fuel tank liquid level sensor, setting is in the high-order fuel tank, for sensing the in the high-order fuel tank
One fuel liquid level；And
Fuel oil refueling pump, setting between the storage tank and the high-order fuel tank and with the high-order fuel tank liquid level
Sensor electrical connection, with when first fuel liquid level is less than or equal to the first predetermined threshold by the combustion in the storage tank
Oil is injected into the high-order fuel tank.
3. diesel-engine tester fuel oil supply system according to claim 1, which is characterized in that the volume control device
Including ball-cock assembly, the ball-cock assembly includes:
Valve rod, one end of the valve rod are pivotally installed on the inner wall of the daily fuel tank；And
At least one floating ball, the floating ball are set on the valve rod, and the floating ball changes because of the liquid level of the daily fuel tank
And the valve rod is driven to swing, and then control the high-order fuel tank and be injected into the fuel flow rate in the daily fuel tank.
4. diesel-engine tester fuel oil supply system according to claim 1, which is characterized in that the volume control device
Including liquid level motor-operated control valve.
5. diesel-engine tester fuel oil supply system according to claim 1 characterized by comprising
Hand stop valve is arranged on the pipeline between the high-order fuel tank and the daily fuel tank.
6. diesel-engine tester fuel oil supply system according to claim 5 characterized by comprising
Daily fuel tank liquid level sensor is arranged in the daily fuel tank, for sensing the in the daily fuel tank
Two fuel liquid levels；And
Electric check valve is arranged on the pipeline between the hand stop valve and the high-order fuel tank, the electronic cut-off
Valve is electrically connected with the daily fuel tank liquid level sensor, to be greater than or equal to the second predetermined threshold in second fuel liquid level
When end.
7. diesel-engine tester fuel oil supply system according to claim 1 characterized by comprising
Support frame, the high position fuel tank setting set the high-order fuel tank higher than the daily fuel tank
It sets.
8. diesel-engine tester fuel oil supply system according to claim 1, which is characterized in that the daily fuel tank is
Multiple, multiple daily fuel tanks are connected in parallel.
9. diesel-engine tester fuel oil supply system according to claim 1, which is characterized in that the high position fuel tank is also
Including overflow oil pipe, the overflow oil pipe is connect with the storage tank, so that not having combustion when the fuel oil refueling failure of pump
Oil leakage.
10. diesel-engine tester fuel oil supply system according to claim 1, which is characterized in that the high position fuel tank
Height apart from ground is 15 to 25 meters.
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| CN201811472057.6A CN109734037A (en) | 2018-12-03 | 2018-12-03 | A kind of diesel-engine tester fuel oil supply system |
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| CN201811472057.6A CN109734037A (en) | 2018-12-03 | 2018-12-03 | A kind of diesel-engine tester fuel oil supply system |
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| CN112964474A (en) * | 2021-02-09 | 2021-06-15 | 中国航发哈尔滨东安发动机有限公司 | Aviation low-pressure fuel flow measuring system and method |
| CN113432662A (en) * | 2021-06-30 | 2021-09-24 | 东风汽车集团股份有限公司 | Method and system for setting off-line fuel oil filling amount of factory |
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| CN110455545B (en) * | 2019-08-30 | 2024-01-30 | 中船发动机有限公司 | Fuel oil test system of marine low-speed diesel engine |
| CN112964474A (en) * | 2021-02-09 | 2021-06-15 | 中国航发哈尔滨东安发动机有限公司 | Aviation low-pressure fuel flow measuring system and method |
| CN112964474B (en) * | 2021-02-09 | 2023-10-13 | 中国航发哈尔滨东安发动机有限公司 | Low-pressure fuel flow measurement system and method for aviation |
| CN113432662A (en) * | 2021-06-30 | 2021-09-24 | 东风汽车集团股份有限公司 | Method and system for setting off-line fuel oil filling amount of factory |
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Application publication date: 20190510 |
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