CN221423427U - Variable gear pump and fuel system - Google Patents
Variable gear pump and fuel system Download PDFInfo
- Publication number
- CN221423427U CN221423427U CN202323371220.9U CN202323371220U CN221423427U CN 221423427 U CN221423427 U CN 221423427U CN 202323371220 U CN202323371220 U CN 202323371220U CN 221423427 U CN221423427 U CN 221423427U
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- fuel
- gear pump
- oil
- inlet
- outlet
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- 239000000446 fuel Substances 0.000 title claims abstract description 144
- 239000003921 oil Substances 0.000 claims abstract description 95
- 239000000295 fuel oil Substances 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 239000002828 fuel tank Substances 0.000 claims description 15
- 238000002485 combustion reaction Methods 0.000 claims description 14
- 230000001276 controlling effect Effects 0.000 claims description 10
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- 229910001369 Brass Inorganic materials 0.000 claims description 5
- 239000010951 brass Substances 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 239000000243 solution Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
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- Fuel-Injection Apparatus (AREA)
Abstract
The utility model discloses a variable gear pump and a fuel system, and belongs to the technical field of gear pumps; the variable gear pump comprises an oil inlet, a variable gear pump and a variable gear pump, wherein the oil inlet is used for connecting oil conveying equipment to input fuel into the variable gear pump; the gear pump is used for pressurizing the fuel oil to obtain the pressurized fuel oil; a metering valve for regulating the flow of fuel into the gear pump; the inlet of the metering valve is connected with the oil inlet, and the outlet of the metering valve is connected with the inlet of the gear pump; the oil outlet is used for outputting the pressurized fuel; the oil outlet is connected with an outlet of the gear pump. The utility model provides a variable gear pump and a fuel system.A metering valve is arranged at an inlet of the gear pump, and the opening of the metering valve is controlled by a control unit according to the value of a pressure sensor in a common rail pipe to adjust the fuel flow entering the gear pump, so that the fuel pressure in the common rail pipe is controlled in a closed loop manner.
Description
Technical Field
The utility model relates to the technical field of gear pumps, in particular to a variable gear pump and a fuel system.
Background
Gear pumps are rotary pumps that rely on the change and movement of working volume created between a pump cylinder and an intermeshing gear to deliver or pressurize a liquid. When the gears rotate, the volume of the space at the disengaging side of the gears is changed from small to large, vacuum is formed, liquid is sucked in, the volume of the space at the engaging side of the gears is changed from large to small, and the liquid is extruded into the pipeline. The suction chamber is separated from the discharge chamber by the meshing line of the two gears.
The pressure at the discharge of the gear pump is entirely dependent on the amount of resistance at the pump outlet. However, the gear pump has unbalanced radial force, large flow pulsation, large noise, low efficiency, poor interchangeability of parts, difficult repair after abrasion and incapability of being used as a variable pump.
Therefore, there is a need to design a variable displacement gear pump that closed-loop controls the fuel pressure in the common rail by adjusting the fuel flow into the gear pump.
Disclosure of utility model
The utility model provides a variable gear pump and a fuel system for realizing closed-loop control of fuel pressure in a common rail pipe by adjusting fuel flow entering the gear pump.
In order to solve the technical problems, the technical scheme of the utility model is as follows:
A variable gear pump comprising:
the oil inlet is used for connecting oil conveying equipment to input fuel into the variable gear pump;
The gear pump is used for pressurizing the fuel oil to obtain the pressurized fuel oil; a plurality of flow passages are arranged in the gear pump;
A metering valve for regulating the flow of fuel into the gear pump; the inlet of the metering valve is connected with the oil inlet, and the outlet of the metering valve is connected with the inlet of the gear pump;
The oil outlet is used for outputting the pressurized fuel; the oil outlet is connected with an outlet of the gear pump.
Further, the oil inlet and the oil outlet are made of stainless steel materials, brass materials or aluminum alloy materials.
Further, the variable gear pump also comprises an oil return port and an overflow valve; when the pressure in the system is too high, the overflow valve is opened, and redundant fuel is returned to the fuel tank so as to maintain the normal working pressure of the system;
An inlet of the overflow valve is connected with the oil inlet;
And an outlet of the overflow valve is connected with the oil return port.
Further, the variable gear pump also comprises an oil return port and an exhaust valve; the exhaust valve is used for exhausting air accumulated in the pump body, so that smooth fuel circulation is ensured;
The inlet of the exhaust valve is connected with the outlet of the metering valve;
and the outlet of the exhaust valve is connected with the oil return port.
In the technical scheme, a metering valve is arranged at an inlet of the gear pump, and the opening of the metering valve is controlled to adjust the fuel flow entering the gear pump. Before the gear pump works, air exists in each pipeline, so that the gear pump is difficult to build pressure when idling, and then the exhaust valve can be opened to exhaust the air in front of the inlet of the gear pump. After being pressurized by the oil delivery pump, the fuel in the oil tank enters the oil inlet, and the pressure of the fuel at the rear end of the oil inlet is controlled by the overflow valve, so that the excessive pressure of the oil inlet is avoided.
The main advantage of the variable gear pump provided by the technical scheme is that the flow of fuel can be adjusted according to the needs, so that more accurate oil quantity control can be provided under different power demands. In addition, the overflow valve and the exhaust valve of the pump also greatly improve the safety and reliability of the pump, and can ensure that the system can still work stably under the condition of high pressure or air accumulation. Finally, the choice of materials for stainless steel, brass or aluminum alloy also ensures the corrosion resistance and durability of the pump, and is suitable for various industrial application scenes.
The utility model also provides a fuel system which comprises a fuel supply module, a fuel pressurizing module and a fuel injection module which are sequentially connected, wherein the fuel pressurizing module adopts the variable gear pump;
The fuel injection module comprises a common rail pipe, a pressure sensor, a control unit and an injector; the inlet of the common rail pipe is connected with the oil outlet of the variable gear pump, the outlet of the common rail pipe is connected with the injector, and the injector is used for injecting high-pressure fuel into the combustion chamber of the engine to realize combustion; the pressure sensor is arranged on the common rail pipe, the pressure sensor and the metering valve are electrically connected with the control unit, and the control unit is used for controlling the output oil quantity of the variable gear pump according to feedback data of the pressure sensor.
According to the technical scheme, the metering valve is arranged at the inlet of the gear pump, the opening of the metering valve is controlled by the control unit according to the numerical value of the pressure sensor in the common rail pipe to adjust the fuel flow entering the gear pump, and then the fuel pressure in the common rail pipe is controlled in a closed loop mode.
The fuel system provided by the technical scheme has the advantages that the technology of precisely adjusting the fuel flow and the fuel pressure of the variable gear pump is adopted, and the high-efficiency operation and the optimized combustion of the fuel system can be realized through the feedback control of the pressure sensor and the control unit. The system is suitable for various internal combustion engines or fuel injection systems requiring accurate fuel supply, and can provide higher fuel injection precision and combustion efficiency.
Further, the fuel supply module comprises a fuel tank and a fuel delivery pump, wherein an inlet of the fuel delivery pump is connected with the fuel tank through a connecting pipe and is used for extracting fuel from the fuel tank.
Further, an outlet of the oil delivery pump is connected with an oil inlet of the variable gear pump and used for delivering fuel to the oil inlet.
Further, an oil return port of the variable gear pump is connected with the oil tank and used for returning unused fuel oil to the oil tank.
Further, the fuel injection module further includes a pressure limiting valve mounted on the common rail.
Further, one end of the pressure limiting valve is connected with the oil tank and used for controlling the fuel pressure in the common rail system.
Specifically, the fuel supply module comprises an oil tank and an oil delivery pump, wherein an inlet of the oil delivery pump is connected with the oil tank through a connecting pipe and is used for extracting fuel and delivering the fuel to the oil inlet so as to further pressurize. The oil return port of the variable gear pump is connected to the oil tank and used for returning unused fuel oil to the oil tank so as to realize the recycling of the fuel oil. A pressure limiting valve is added to the fuel injection module and is mounted on the common rail with one end connected to the tank for controlling the fuel pressure in the common rail system. The function of such a pressure limiting valve is to maintain a certain fuel pressure in the common rail to ensure that excessive or insufficient fuel pressure does not occur in the system. If the fuel pressure is too high, the pressure limiting valve automatically reduces the pressure and returns the fuel to the fuel tank to protect the whole system.
Compared with the prior art, the technical scheme of the utility model has the beneficial effects that:
1. According to the utility model, the metering valve is arranged at the inlet of the gear pump, the opening of the metering valve is controlled by the control unit according to the value of the pressure sensor in the common rail pipe to adjust the fuel flow entering the gear pump, and then the fuel pressure in the common rail pipe is controlled in a closed loop manner;
2. according to the utility model, after the fuel in the fuel tank is pressurized by the fuel delivery pump, the fuel enters the oil inlet of the gear pump, and the pressure of the fuel at the rear end of the oil inlet is controlled by the overflow valve, so that the excessive pressure of the oil inlet is avoided;
3. In the utility model, before the gear pump works, air exists in each pipeline, so that the gear pump is difficult to build pressure when idling, and the air in front of the inlet of the gear pump can be discharged by opening the exhaust valve.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic perspective view of a variable displacement gear pump of the present utility model;
FIG. 2 is a system block diagram of a variable displacement gear pump of the present utility model;
FIG. 3 is a system block diagram of the fuel system of the present utility model;
The figure indicates:
1. an oil inlet; 2. a metering valve; 3. an oil return port; 4. an exhaust valve; 5. an overflow valve; 6. a gear pump; 7. an oil outlet;
8. An oil tank; 9. an oil delivery pump;
10. a common rail pipe; 11. a pressure limiting valve; 12. a pressure sensor; 13. a control unit; 14. an ejector.
Detailed Description
For a better understanding of the objects, structures and functions of the present utility model, the technical solution of the present utility model will be described in further detail with reference to the drawings and the specific preferred embodiments.
In the description of the present utility model, it should be understood that the terms "left", "right", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and thus are not to be construed as limiting the present utility model. The specific dimensions used in the examples are for illustration of the technical solution only and do not limit the scope of protection of the utility model. It will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Unless specifically stated or limited otherwise, the terms "mounted," "configured," "connected," "secured," and the like should be construed broadly, as they may be either fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Example 1:
As shown in fig. 1-2, the present utility model provides a technical solution: a variable gear pump comprising:
The oil inlet 1 is used for connecting oil conveying equipment to input fuel into the variable gear pump;
The gear pump 6 is used for pressurizing the fuel oil to obtain the pressurized fuel oil; a plurality of flow passages are arranged in the gear pump 6;
A metering valve 2 for regulating the flow of fuel into said gear pump 6; an inlet of the metering valve 2 is connected with the oil inlet 1, and an outlet of the metering valve 2 is connected with an inlet of the gear pump 6;
An oil outlet 7 for outputting the pressurized fuel; the oil outlet 7 is connected with the outlet of the gear pump 6.
Further, the oil inlet 1 and the oil outlet 7 are made of stainless steel, brass or aluminum alloy.
Further, the variable gear pump also comprises an oil return port 3 and an overflow valve 5; when the pressure in the system is too high, the overflow valve 5 is opened, and redundant fuel is returned to the fuel tank so as to maintain the normal working pressure of the system;
the inlet of the overflow valve 5 is connected with the oil inlet 1;
the outlet of the overflow valve 5 is connected with the oil return port 3.
Further, the variable gear pump also comprises an oil return port 3 and an exhaust valve 4; the exhaust valve 4 is used for exhausting air accumulated in the pump body and ensuring smooth fuel circulation;
The inlet of the exhaust valve 4 is connected with the outlet of the metering valve 2;
The outlet of the exhaust valve 4 is connected with the oil return port 3.
In this embodiment, the metering valve 2 is provided at the inlet of the gear pump 6, and the opening degree of the metering valve 2 is controlled to adjust the flow rate of fuel entering the gear pump 6. Before the gear pump works, air exists in each pipeline, so that the gear pump 6 is idle, the pressure is difficult to build, and at the moment, the exhaust valve 4 can be opened to exhaust the air before the inlet of the gear pump 6. After being pressurized by an oil delivery pump, the fuel in the oil tank enters the oil inlet 1, and the pressure of the fuel at the rear end of the oil inlet 1 is controlled by the overflow valve 5, so that the excessive pressure of the oil inlet 1 is avoided.
The main advantage of the variable gear pump provided by the embodiment is that the flow rate of the fuel can be adjusted according to the requirement, so that more accurate oil quantity control can be provided under different power requirements. In addition, the relief valve 5 and the exhaust valve 4 of the pump also greatly improve the safety and reliability of the pump, and can ensure that the system can still stably work under the condition of high pressure or air accumulation. Finally, the choice of materials for stainless steel, brass or aluminum alloy also ensures the corrosion resistance and durability of the pump, and is suitable for various industrial application scenes.
Example 2:
As shown in fig. 3, the present utility model provides a technical solution: the fuel system comprises a fuel supply module, a fuel pressurizing module and a fuel injection module which are sequentially connected, wherein the fuel pressurizing module adopts the variable gear pump;
The fuel injection module comprises a common rail pipe 10, a pressure sensor 12, a control unit 13 and an injector 14; an inlet of the common rail pipe 10 is connected with an oil outlet 7 of the variable gear pump, an outlet of the common rail pipe 10 is connected with the injector 14, and the injector 14 is used for injecting high-pressure fuel into a combustion chamber of the engine to realize combustion; the pressure sensor 12 is installed on the common rail pipe 10, the pressure sensor 12 and the metering valve 2 are electrically connected with the control unit 13, and the control unit 13 is used for controlling the output oil quantity of the variable gear pump according to the feedback data of the pressure sensor 12.
Among other things, common rail 10 is an important component for use in an engine fuel injection system. It is a high pressure conduit for supplying fuel to the injector and controlling the pressure and timing of the fuel. Specifically, the common rail 10 is a pipe system extending through the entire engine that connects the fuel reservoir and the individual injectors. Fuel is fed into the common rail by the high-pressure pump and a reservoir of high-pressure fuel is formed in the common rail 10. In the common rail 10, the fuel pressure is monitored by a pressure sensor 12, and the fuel supply pressure is regulated and controlled by a control unit 13.
In the present embodiment, the metering valve 2 is provided at the inlet of the gear pump 6, and the opening of the metering valve 2 is controlled by the control unit 13 according to the value of the pressure sensor 12 in the common rail 10 to adjust the flow rate of fuel into the gear pump 6, thereby controlling the fuel pressure in the common rail 10 in a closed-loop manner.
The fuel system provided by the embodiment has the advantages that the technology of precisely adjusting the fuel flow and the fuel pressure, such as a variable gear pump, is adopted, and the efficient operation and the optimized combustion of the fuel system can be realized through the feedback control of the pressure sensor 12 and the control unit 13. The system is suitable for various internal combustion engines or fuel injection systems requiring accurate fuel supply, and can provide higher fuel injection precision and combustion efficiency.
Example 3:
On the basis of embodiment 2, the fuel supply module comprises a fuel tank 8 and a fuel delivery pump 9, and an inlet of the fuel delivery pump 9 is connected with the fuel tank 8 through a connecting pipe for extracting fuel from the fuel tank 8.
Further, an outlet of the oil transfer pump 9 is connected with an oil inlet 1 of the variable gear pump, and is used for transferring fuel oil to the oil inlet 1.
Further, an oil return port 3 of the variable gear pump is connected to the oil tank 8 for returning unused fuel to the oil tank 8.
Further, the fuel injection module further includes a pressure limiting valve 11, and the pressure limiting valve 11 is mounted on the common rail pipe 10.
Further, one end of the pressure limiting valve 11 is connected to the tank 8 for controlling the fuel pressure in the common rail system.
Specifically, the fuel supply module is composed of a fuel tank 8 and a fuel transfer pump 9, wherein an inlet of the fuel transfer pump 9 is connected with the fuel tank 8 through a connecting pipe for extracting fuel and delivering the fuel to the fuel inlet 1 for further pressurization. The oil return port 3 of the variable gear pump is connected to the oil tank 8 and is used for returning unused fuel to the oil tank 8 so as to realize the recycling of the fuel. A pressure limiting valve 11 is added in the fuel injection module, which is mounted on the common rail 10, one end of which is connected to the tank 8 for controlling the fuel pressure in the common rail system. The function of such a pressure limiting valve is to maintain a certain fuel pressure in the common rail 10 to ensure that no excessive or insufficient fuel pressure will occur in the system. If the fuel pressure is too high, the pressure limiting valve will automatically depressurize and return the fuel to the tank 8 to protect the whole system.
In conclusion, the fuel system is more comprehensive in design, comprises components such as an oil tank 8, an oil delivery pump 9, a variable gear pump, a common rail pipe 10, a pressure sensor 12, a nozzle device 14, a pressure limiting valve 11 and the like, can provide more accurate, efficient, safe and reliable fuel supply and combustion control through perfect control and operation guarantee, and is suitable for application scenes of various internal combustion engines or fuel injection systems.
It is to be understood that the above examples of the present utility model are provided by way of illustration only and not by way of limitation of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.
Claims (10)
1. A variable displacement gear pump, comprising:
The oil inlet (1) is used for connecting oil conveying equipment to input fuel into the variable gear pump;
The gear pump (6) is used for pressurizing the fuel oil to obtain the pressurized fuel oil;
A metering valve (2) for regulating the flow of fuel into the gear pump (6); an inlet of the metering valve (2) is connected with the oil inlet (1), and an outlet of the metering valve (2) is connected with an inlet of the gear pump (6);
An oil outlet (7) for outputting the pressurized fuel; the oil outlet (7) is connected with the outlet of the gear pump (6).
2. Variable gear pump according to claim 1, characterized in that the oil inlet (1) and the oil outlet (7) are made of stainless steel or brass or aluminium alloy.
3. Variable gear pump according to claim 1, characterized in that it further comprises an oil return port (3) and an overflow valve (5);
an inlet of the overflow valve (5) is connected with the oil inlet (1);
The outlet of the overflow valve (5) is connected with the oil return port (3).
4. Variable gear pump according to claim 1, characterized in that it further comprises an oil return port (3) and an exhaust valve (4);
The inlet of the exhaust valve (4) is connected with the outlet of the metering valve (2);
the outlet of the exhaust valve (4) is connected with the oil return port (3).
5. A fuel system, characterized by: comprising a fuel supply module, a fuel pressurization module and a fuel injection module connected in sequence, said fuel pressurization module employing a variable gear pump according to any one of claims 1 to 4;
The fuel injection module comprises a common rail pipe (10), a pressure sensor (12), a control unit (13) and an injector (14); an inlet of the common rail pipe (10) is connected with an oil outlet (7) of the variable gear pump, an outlet of the common rail pipe (10) is connected with the injector (14), and the injector (14) is used for injecting high-pressure fuel into a combustion chamber of an engine to realize combustion; the pressure sensor (12) is arranged on the common rail pipe (10), the pressure sensor (12) and the metering valve (2) are electrically connected with the control unit (13), and the control unit (13) is used for controlling the output oil quantity of the variable gear pump according to feedback data of the pressure sensor (12).
6. The fuel system according to claim 5, characterized in that the fuel supply module comprises a fuel tank (8) and a fuel transfer pump (9), the inlet of the fuel transfer pump (9) being connected to the fuel tank (8) by a connecting pipe for withdrawing fuel from the fuel tank (8).
7. The fuel system according to claim 6, characterized in that the outlet of the fuel transfer pump (9) is connected with the inlet (1) of a variable gear pump for feeding fuel to the inlet (1).
8. The fuel system according to claim 6, characterized in that an oil return port (3) of a variable gear pump is connected to the tank (8) for returning unused fuel to the tank (8).
9. The fuel system according to claim 6, characterized in that the fuel injection module further comprises a pressure limiting valve (11), the pressure limiting valve (11) being mounted on the common rail (10).
10. A fuel system according to claim 9, characterized in that one end of the pressure limiting valve (11) is connected to the tank (8) for controlling the fuel pressure in the common rail system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323371220.9U CN221423427U (en) | 2023-12-12 | 2023-12-12 | Variable gear pump and fuel system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323371220.9U CN221423427U (en) | 2023-12-12 | 2023-12-12 | Variable gear pump and fuel system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221423427U true CN221423427U (en) | 2024-07-26 |
Family
ID=91974494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323371220.9U Active CN221423427U (en) | 2023-12-12 | 2023-12-12 | Variable gear pump and fuel system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221423427U (en) |
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2023
- 2023-12-12 CN CN202323371220.9U patent/CN221423427U/en active Active
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