CN113790118A - Serial-type common rail pipe assembly - Google Patents
Serial-type common rail pipe assembly Download PDFInfo
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- CN113790118A CN113790118A CN202111221750.8A CN202111221750A CN113790118A CN 113790118 A CN113790118 A CN 113790118A CN 202111221750 A CN202111221750 A CN 202111221750A CN 113790118 A CN113790118 A CN 113790118A
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- Prior art keywords
- common rail
- pipe
- rail pipe
- oil
- pressure oil
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/004—Joints; Sealings
- F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
Abstract
The invention provides a serial common rail pipe assembly which comprises a first common rail pipe, a second common rail pipe, a first high-pressure oil pipe, an oil inlet adapter and a pressure sensor, wherein the first common rail pipe is connected with the second common rail pipe through a first connecting pipe; the first common rail pipe and the second common rail pipe have the same structure and respectively comprise a middle hole, a first oil inlet and outlet interface, a second oil inlet and outlet interface, three high-pressure oil supply interfaces and three mounting lugs, and the first oil inlet and outlet interface, the second oil inlet and outlet interface and the high-pressure oil supply interfaces are respectively communicated with the corresponding middle holes; the first common rail pipe is connected with the second common rail pipe through a first high-pressure oil pipe; a pressure sensor is connected to the second end of the second common rail tube. The tandem type common rail pipe assembly can eliminate the influence on the stability and consistency of oil injection of each cylinder of a diesel engine due to different lengths of high-pressure oil pipes, can shorten the length of the high-pressure oil pipes, reduce the on-way pressure loss of the high-pressure oil pipes, reduce the arrangement space of the high-pressure oil pipes, improve the structural compactness of the diesel engine, and improve the convenience of assembling, maintaining and replacing the common rail pipe assembly and the high-pressure oil pipes.
Description
Technical Field
The invention relates to the technical field of high-pressure common rail fuel injection systems, in particular to a serial common rail pipe assembly.
Background
Modern diesel engines generally adopt high-pressure common rail fuel injection systems, and can meet the requirements on the dynamic property, the economical efficiency and the emission performance of the diesel engine by realizing ultrahigh injection pressure, ultrahigh control precision and flexible injection rules. The common rail pipe is a key part of a high-pressure common rail fuel injection system, is used for accumulating high-pressure fuel, inhibiting pressure fluctuation and providing high-pressure fuel with stable pressure for the fuel injector, and ensures the stability and consistency of the fuel injection quantity of the fuel injector of each cylinder of the diesel engine.
The diesel engine of the marine power station is large in size, high in power and large in circulating oil injection quantity, and the requirements on the rotating speed fluctuation and the oil injection control precision of the diesel engine are higher for ensuring the stability of output voltage. In order to ensure the stability of the oil injection pressure of a diesel engine fuel system of a ship power station, a common rail pipe assembly with a larger volume of a pressure accumulation cavity needs to be matched.
When the common rail pipe assembly matched with the diesel engine body in length is adopted, the total length of the common rail pipe is large, the die cost of machining and electrolytic deburring of a single common rail pipe forging can be greatly increased, the process difficulty of machining an inner hole by a gun drill is increased along with the increase of the length of an inner hole of the common rail pipe, the machining precision is not easy to guarantee, and the corresponding machining cost can also be increased. According to the invention, as the arrangement form of the electronic control high-pressure common rail system in the marine high-speed high-power diesel engine (application number: 201721181263.2), an arrangement form of the electronic control high-pressure common rail system in the marine high-speed high-power diesel engine is provided, and according to the patent, an A-column common rail pipe is arranged corresponding to a plurality of cylinders on the A side of the V-shaped diesel engine, and a B-column common rail pipe is arranged corresponding to a plurality of cylinders on the B side of the V-shaped diesel engine. As can be seen from the discussion and the attached drawings in the patent, the common rail pipes in the A row and the B row provided in the patent are matched with the length of the body of the diesel engine in length, the total length is larger, and the processing and manufacturing cost of the common rail pipes is relatively higher.
When a common rail pipe with a short length is adopted, the distance between each high-pressure oil supply interface of the common rail pipe assembly cannot be consistent with the cylinder center distance of the diesel engine, and further the distance between each high-pressure oil supply interface and the oil inlet interface of each cylinder oil sprayer of the diesel engine is inconsistent, when high-pressure oil pipes with different lengths are adopted according to the actual distance between the high-pressure oil supply interface of the common rail pipe assembly and the oil inlet interface of each oil sprayer, because the lengths of the high-pressure oil pipes are different, the oil spraying consistency of each oil sprayer is influenced due to the propagation, reflection and superposition of pressure fluctuation in the high-pressure oil pipes and the difference of on-way resistance of the high-pressure oil pipes with different lengths, the rotating speed of the diesel engine is fluctuated, and the dynamic property, the economical property and the emission performance are reduced.
When the common rail pipe and the oil injector are connected by adopting the high-pressure oil pipes with the same length according to the farthest distance corresponding to each high-pressure oil supply interface of the common rail pipe assembly and the oil inlet interface of the oil injector, the cost of matching the diesel engine with the high-pressure oil pipes is increased due to the relatively long length of the high-pressure oil pipes, the on-way pressure loss of the high-pressure oil pipes is increased, and the high-pressure oil pipes are required to be bent in different degrees according to the distance between the high-pressure oil supply interfaces of the common rail pipes and the oil inlet interfaces of the oil injector, so that enough space is reserved for the bent parts of the high-pressure oil pipes, the structural compactness of the diesel engine is influenced, and the high-pressure oil pipes are hard steel pipes, so that special tools are required for bending, and great inconvenience is brought to the assembly, maintenance and the replacement of the high-pressure oil pipes. According to the patent, two groups of first oil injectors are arranged and are respectively communicated with a first common rail pipe and a second common rail pipe through a first high-pressure oil pipe, two groups of second oil injectors are arranged and are respectively communicated with the first common rail pipe and the second common rail pipe through a second high-pressure oil pipe, and the first common rail pipe and the second common rail pipe can supply oil to the first oil injectors and the second oil injectors, so that the oil injection consistency of each oil injector can be ensured. As can be seen from the discussion and the attached drawings in the patent, the distances between the high-pressure oil supply interface of the common rail pipe and the oil inlet interface of the oil injector are different, and different bending processing needs to be carried out on the high-pressure oil pipe. The patent 'diesel oil supply system of V-shaped diesel engine' (application number: 201920067782.9) provides a diesel oil supply system of V-shaped multi-cylinder diesel engine, a plurality of high pressure oil pipes of the diesel oil supply system are communicated with oil outlets of a common rail pipe; wherein each high-pressure oil pipe is connected with an oil sprayer. According to the technical scheme, the distances between the high-pressure oil supply interface of the common rail pipe and the oil inlet interface of the oil injector are different, so that the high-pressure oil pipe needs to be bent to different degrees. The invention provides a high-pressure common rail system of a V-shaped multi-cylinder diesel engine (application number: 201821846203.2). the technical scheme provided by the invention comprises a plurality of common rail pipes and a plurality of high-pressure oil pipes. One end of each of the high-pressure oil pipes in the technical scheme is communicated with one part of the oil outlets of the common rail pipe, and the other end of each of the high-pressure oil pipes is connected with the oil injector. The technical scheme of the invention adopts a serial arrangement mode of a plurality of common rail pipes, but the distance between high-pressure oil supply interfaces of the common rail pipes is not consistent with the cylinder center distance of a diesel engine, and the high-pressure oil pipes between the common rail pipe assembly and an oil injector are different in shape and form, and are required to be bent to different degrees.
Aiming at the problems, a common rail pipe assembly needs to be designed to solve the engineering problems, on one hand, the common rail pipe with shorter length should be adopted as far as possible, the processing and manufacturing cost of a common rail pipe monomer is reduced, and simultaneously, the length of a high-pressure oil pipe between a high-pressure oil supply interface of the common rail pipe assembly and an oil inlet interface of an oil injector is ensured to be consistent, so that the influence on the oil injection stability and consistency of each cylinder of the diesel engine due to different lengths of the high-pressure oil pipe is eliminated; on the other hand, the length of a high-pressure oil pipe between the common rail pipe assembly and the oil injector is required to be shortened as much as possible, the cost of matching the high-pressure oil pipe with the diesel engine is reduced, the on-way pressure loss in the high-pressure oil pipe is reduced, the requirement of the high-pressure oil pipe on the arrangement space is reduced, the structural compactness of the diesel engine is improved, and the convenience of assembling, maintaining and replacing the common rail pipe assembly and the matched high-pressure oil pipe is improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a serial common rail pipe assembly, which can adopt a common rail pipe with shorter length, simultaneously enables the distance between high-pressure oil supply interfaces of the common rail pipe assembly to be consistent with the cylinder center distance of a diesel engine, ensures the length of a high-pressure oil pipe between the common rail pipe and an oil injector to be consistent on the premise of not increasing the manufacturing and processing cost of a common rail pipe monomer, eliminates the influence on the oil injection stability and consistency of each cylinder of the diesel engine due to the different lengths of the high-pressure oil pipe between the common rail pipe assembly and the oil injector, simultaneously can shorten the length of the high-pressure oil pipe as much as possible, reduces the on-way pressure loss of the high-pressure oil pipe, reduces the arrangement space of the high-pressure oil pipe, improves the structural compactness of the diesel engine, and improves the convenience for assembling, maintaining and replacing the common rail pipe assembly and the matched high-pressure oil pipe.
In order to achieve the above object, the present invention provides a serial common rail pipe assembly, which includes a first common rail pipe, a second common rail pipe, a first high pressure oil pipe, an oil inlet adapter, and a pressure sensor; the first common rail pipe and the second common rail pipe have the same structure and respectively comprise a middle hole, a first oil inlet and outlet interface, a second oil inlet and outlet interface, three high-pressure oil supply interfaces and three mounting lugs, the first oil inlet and outlet interface is arranged on the side part of the first end corresponding to the first common rail pipe and the second common rail pipe, and the second oil inlet and outlet interface is arranged on the side part of the second end corresponding to the first common rail pipe and the second common rail pipe; the middle hole is arranged along the axial direction corresponding to the first common rail pipe and the second common rail pipe; the first oil inlet and outlet interface, the second oil inlet and outlet interface and the high-pressure oil supply interface are respectively communicated with the corresponding middle hole through an oil hole and a throttling hole which are connected and distributed along the radial direction and are sequentially connected with each other; the diameter of the throttling hole is 1.8 mm; the oil inlet adapter is connected to the first end of the first common rail pipe; the second end of the first common rail pipe is connected with the first end of the second common rail pipe through the first high-pressure oil pipe or the second oil inlet and outlet interface of the first common rail pipe is connected with the first oil inlet and outlet interface of the second common rail pipe through the first high-pressure oil pipe; the pressure sensor is connected to a second end of the second common rail tube.
Preferably, a threaded connection hole is formed at each of both ends of the first common rail pipe and the second common rail pipe; the oil inlet adapter is in threaded connection with the first end of the first common rail pipe; the pressure sensor is bolted to a second end of the second common rail pipe.
Preferably, when the second oil inlet/outlet interface of the first common rail pipe is connected to the first oil inlet/outlet interface of the second common rail pipe through the first high-pressure oil pipe, the first common rail pipe and the second common rail pipe further include a first plug respectively, and the first plugs are plugged at the second end of the first common rail pipe and the first end of the second common rail pipe respectively.
Preferably, the high-pressure oil supply interfaces are arranged between the corresponding first oil inlet and outlet interfaces and the corresponding second oil inlet and outlet interfaces at intervals, the high-pressure oil supply interfaces correspond to the oil injectors of the cylinders of the diesel engine one by one, and the distance between the high-pressure oil supply interfaces is equal to the cylinder center distance of the diesel engine.
Preferably, the second oil inlet and outlet port of the second common rail pipe is not machined or plugged by a plug.
Preferably, the structure of the third common rail pipe is the same as that of the first common rail pipe and that of the second common rail pipe; a second oil inlet and outlet interface of the second common rail pipe is connected with the first oil inlet and outlet interface of the third common rail pipe through the second high-pressure oil pipe; the second end cap is respectively plugged at the second end of the second common rail pipe and the first end of the third common rail pipe; the pressure sensor is connected to a second end of the third common rail tube.
Preferably, the first oil inlet and outlet interface of the first common rail pipe is connected with an outlet of a high-pressure oil pump or is not processed or is plugged by a plug.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
according to the serial common rail pipe assembly provided by the invention, the high-pressure oil supply interfaces of the serial common rail pipe assembly correspond to the oil sprayers of the cylinders of the diesel engine one by one, and the distance between the high-pressure oil supply interfaces is consistent with the cylinder center distance of the diesel engine, so that the distance between the high-pressure oil supply interfaces of the assembled serial common rail pipe assembly and the oil inlet interfaces of the corresponding oil sprayers of the cylinders is consistent, the high-pressure oil supply interfaces for connecting the serial common rail pipe assembly are ensured to be consistent with the length of the high-pressure oil pipes of the corresponding oil sprayers, and the influence on the oil spraying consistency of the cylinders caused by the different lengths of the high-pressure oil pipes is eliminated. Meanwhile, the first common rail pipe and the second common rail pipe are connected in series through the first high-pressure oil pipe, the length of the adopted common rail pipe single body is relatively short, the manufacturing and processing cost of the common rail pipe single body can be reduced, the distance between each high-pressure oil supply interface of the series common rail pipe assembly and the corresponding cylinder oil injector is closer, the length of the high-pressure oil pipe can be shortened, the on-way pressure loss of the high-pressure oil pipe is reduced, the arrangement space of the high-pressure oil pipe is reduced, the structure compactness of a diesel engine is improved, and the convenience of assembling, maintaining and replacing the series common rail pipe assembly and the matched high-pressure oil pipe is improved.
In addition, the serial common rail pipe assembly provided by the invention can adopt the high-pressure oil pipes with the same length between the serial common rail pipe assembly and the oil injector, so that the high-pressure oil pipes can adopt consistent bending angles, keep consistent shape and manufacture, and increase the convenience of bending treatment, maintenance part allocation and maintenance and replacement of the high-pressure oil pipes.
Drawings
Fig. 1 is a schematic structural diagram of a series common rail assembly according to a first embodiment of the present invention;
FIG. 2 is a cross-sectional view of a tandem common rail assembly according to a first embodiment of the present invention;
FIG. 3 is a cross-sectional view of a first common rail according to a first embodiment of the present invention;
FIG. 4 is a partial cross-sectional view of the junction of a first common rail and a second common rail according to a first embodiment of the present invention;
FIG. 5 is a schematic view of a connection structure of a series common rail assembly and a fuel injector according to a first embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a tandem-type common rail assembly according to a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a series common rail assembly according to a third embodiment of the present invention.
Detailed Description
The following description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, which are set forth in the accompanying drawings of fig. 1-7, and will make the functions and features of the invention better understood.
Referring to fig. 1 to 5, a series common rail assembly according to a first embodiment of the present invention includes a first common rail 1, a second common rail 2, a first high pressure oil pipe 3, an oil inlet adapter 4, and a pressure sensor 5; the first common rail pipe 1 and the second common rail pipe 2 have the same structure and respectively comprise a middle hole 6, a first oil inlet and outlet interface 7, a second oil inlet and outlet interface 8, three high-pressure oil supply interfaces 9 and three mounting lugs 10, the first oil inlet and outlet interface 7 is arranged at the side part of the first end corresponding to the first common rail pipe 1 and the second common rail pipe 2, and the second oil inlet and outlet interface 8 is arranged at the side part of the second end corresponding to the first common rail pipe 1 and the second common rail pipe 2; the middle hole 6 is arranged along the axial direction of the corresponding first common rail pipe 1 and the second common rail pipe 2; the first oil inlet and outlet port 7, the second oil inlet and outlet port 8 and the high-pressure oil supply port 9 are respectively communicated with the corresponding middle hole 6 through an oil hole and a throttling hole 11 which are connected and distributed along the radial direction and are sequentially connected; the diameter of the throttling hole 11 is 1.8mm, and the pressure fluctuation in a liquid path system of the serial common rail pipe assembly in the oil supply process is restrained through the throttling effect, so that the stability of the fuel pressure is improved; the oil inlet adapter 4 is connected to the first end of the first common rail pipe 1; the second oil inlet and outlet interface 8 of the first common rail pipe 1 is connected with the first oil inlet and outlet interface 7 of the second common rail pipe 2 through the first high-pressure oil pipe 3; a pressure sensor 5 is connected to a second end of the second common rail pipe 2.
Two ends of the first common rail pipe 1 and the second common rail pipe 2 are respectively provided with a threaded connecting hole 12; the oil inlet adapter 4 is in threaded connection with the first end of the first common rail pipe 1 and is used for connecting a high-pressure oil pump through a high-pressure oil pipe and inputting high-pressure fuel oil to the middle hole 6 of the first common rail pipe 1; and the pressure sensor 5 is in threaded connection with the second end of the second common rail pipe 2 and is used for measuring and feeding back the fuel pressure in the cavity of the series common rail pipe assembly.
The first common rail pipe 1 and the second common rail pipe 2 further comprise a first plug 13 respectively, and the first plug 13 is plugged at the second end of the first common rail pipe 1 and the first end of the second common rail pipe 2 in a threaded mode respectively.
When the series common rail pipe assembly only comprises two common rail pipes, the second oil inlet and outlet interface 8 of the second common rail pipe 2 is not processed or is plugged by a plug. In other embodiments, when the in-line common rail assembly comprises a third common rail, the second oil inlet/outlet port 8 of the second common rail 2 is adapted to be connected to the first oil inlet/outlet port 7 of the third common rail.
When the serial common rail pipe assembly is connected with the outlets of the two high-pressure oil pumps, the first oil inlet and outlet interface 7 of the first common rail pipe 1 is connected with the second high-pressure outlet of the high-pressure oil pump through the high-pressure oil pipe, and when the serial common rail pipe assembly is connected with one high-pressure oil pump outlet, the first oil inlet and outlet interface 7 of the first common rail pipe 1 is not processed or is plugged by a plug.
The high-pressure fuel supply interfaces 9 of the first common rail pipe 1 and the second common rail pipe 2 are respectively connected with the fuel injector 14 of the corresponding cylinder through the fuel injector high-pressure fuel pipe 16 and the fuel injector transverse cavity 15, and provide high-pressure fuel with stable pressure for the fuel injector 14.
The series common rail pipe assembly is fixedly arranged on a diesel engine body through a mounting lug 10.
The high-pressure oil supply interfaces 9 are arranged between the corresponding first oil inlet and outlet interfaces 7 and the corresponding second oil inlet and outlet interfaces 8 at intervals, the high-pressure oil supply interfaces 9 correspond to the oil injectors 14 of the cylinders of the diesel engine one by one, and the distance between the high-pressure oil supply interfaces 9 is equal to the cylinder center distance of the diesel engine. The distances between the high-pressure oil supply interfaces 9 and the corresponding cylinders of the series common rail pipe assembly after the series common rail pipe assembly is assembled are consistent, so that the lengths of the high-pressure oil pipes 16 of the oil injectors between the high-pressure oil supply interfaces 9 and the corresponding oil injectors 14 of the series common rail pipe assembly are consistent, and the influence on the oil injection consistency of the cylinders caused by the different lengths of the high-pressure oil pipes 16 of the oil injectors between the series common rail pipe assembly and the oil injectors 14 can be eliminated. Meanwhile, the common rail single body adopted by the serial common rail pipe assembly is relatively short in length, the manufacturing and processing cost of the common rail pipe single body can be reduced, and the high-pressure oil supply interfaces 9 of the serial common rail pipe assembly are closer to the corresponding cylinder oil injector 14, so that the length of the oil injector high-pressure oil pipe 16 between the serial common rail pipe assembly and the oil injector 14 can be shortened, the on-way pressure loss of the oil injector high-pressure oil pipe 16 is reduced, the arrangement space of the oil injector high-pressure oil pipe 16 is reduced, the structural compactness of a diesel engine is improved, and the convenience of assembling, maintaining and replacing the serial common rail pipe assembly and the matched oil injector high-pressure oil pipe 16 is improved.
In addition, the fuel injector high-pressure fuel pipe 16 with the same length can be adopted between the serial common rail pipe assembly and the fuel injector 14, so that the fuel injector high-pressure fuel pipe 16 can adopt the consistent bending angle and keep the consistent shape, and the convenience of bending, maintenance part allocation and maintenance and replacement of the fuel injector high-pressure fuel pipe 16 can be improved.
Referring to fig. 5, an assembly of a tandem common rail assembly and an injector 14 according to a first embodiment of the present invention is shown. The oil injector 14 is connected with the high-pressure oil supply interface 9 of the serial common rail pipe assembly through the oil injector transverse cavity 15 and the oil injector high-pressure oil pipe 16, the high-pressure interfaces of the serial common rail pipe assembly are closer to the oil injector 14, and the oil injector high-pressure oil pipe 16 for connection is shorter and can adopt the same length and bending angle.
The first embodiment of the present invention is applicable to an in-line six-cylinder marine power plant diesel engine, and also to a 12-cylinder marine power plant diesel engine arranged in a V-shape.
Referring to fig. 6, a second embodiment of the invention provides a series common rail assembly, which has a structure substantially the same as that of the first embodiment, except that: the first high-pressure oil pipe 3 is a straight pipe and is respectively in threaded connection with the second end of the first common rail pipe 1 and the first end of the second common rail pipe 2; by selecting the length of the first high-pressure oil pipe 3, the distance between a high-pressure oil supply interface 9 nearest to the second end of the first common rail pipe 1 and a high-pressure oil supply interface 9 nearest to the first end of the second common rail pipe 2 is ensured to be consistent with the cylinder center distance of the diesel engine. The straight first high-pressure oil pipe 3 adopted in the second embodiment can shorten the length of the high-pressure oil pipe between the first common rail pipe 1 and the second common rail pipe 2 in the serial common rail pipe assembly, can further reduce the on-way pressure loss of the high-pressure oil pipe, and improves the pressure stability in the cavity of the serial common rail pipe assembly.
The second embodiment of the invention can be applied to an inline six-cylinder marine power station diesel engine and can also be applied to a 12-cylinder diesel engine arranged in a V shape.
Referring to fig. 7, a tandem type common rail assembly according to a second embodiment of the present invention has a structure substantially the same as that of the first embodiment, except that: the structure of the third common rail pipe 17 is the same as that of the first common rail pipe 1 and that of the second common rail pipe 2; the second oil inlet and outlet interface 8 of the second common rail pipe 2 is connected with the first oil inlet and outlet interface 7 of the third common rail pipe 17 through a second high-pressure oil pipe 18; the second end of the second common rail pipe 2 and the first end of the third common rail pipe 17 are respectively plugged by a second plug 19; the pressure sensor 5 is connected to a second end of the third common rail 17.
The high-pressure oil supply requirement of the oil injector with 9 cylinders can be met, and the high-pressure oil supply device can be applied to the diesel engine with 18 cylinders arranged in a V shape in a marine power station.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (7)
1. A serial common rail pipe assembly is characterized by comprising a first common rail pipe, a second common rail pipe, a first high-pressure oil pipe, an oil inlet adapter and a pressure sensor; the first common rail pipe and the second common rail pipe have the same structure and respectively comprise a middle hole, a first oil inlet and outlet interface, a second oil inlet and outlet interface, three high-pressure oil supply interfaces and three mounting lugs, the first oil inlet and outlet interface is arranged on the side part of the first end corresponding to the first common rail pipe and the second common rail pipe, and the second oil inlet and outlet interface is arranged on the side part of the second end corresponding to the first common rail pipe and the second common rail pipe; the middle hole is arranged along the axial direction corresponding to the first common rail pipe and the second common rail pipe; the first oil inlet and outlet interface, the second oil inlet and outlet interface and the high-pressure oil supply interface are respectively communicated with the corresponding middle hole through an oil hole and a throttling hole which are connected and distributed along the radial direction and are sequentially connected with each other; the diameter of the throttling hole is 1.8 mm; the oil inlet adapter is connected to the first end of the first common rail pipe; the second end of the first common rail pipe is connected with the first end of the second common rail pipe through the first high-pressure oil pipe or the second oil inlet and outlet interface of the first common rail pipe is connected with the first oil inlet and outlet interface of the second common rail pipe through the first high-pressure oil pipe; the pressure sensor is connected to a second end of the second common rail tube.
2. The tandem common rail assembly according to claim 1, wherein both ends of the first common rail pipe and the second common rail pipe are respectively formed with a screw coupling hole; the oil inlet adapter is in threaded connection with the first end of the first common rail pipe; the pressure sensor is bolted to a second end of the second common rail pipe.
3. The tandem common rail assembly according to claim 1, wherein when the second oil inlet/outlet port of the first common rail is connected to the first oil inlet/outlet port of the second common rail through the first high pressure oil pipe, the first common rail and the second common rail further comprise a first plug respectively, and the first plugs are respectively plugged at the second end of the first common rail and the first end of the second common rail.
4. The tandem common rail pipe assembly according to claim 1, wherein the high-pressure oil supply interfaces are arranged between the corresponding first oil inlet and outlet interfaces at intervals, the high-pressure oil supply interfaces correspond to the cylinder injectors of a diesel engine one by one, and the distance between the high-pressure oil supply interfaces is equal to the cylinder center distance of the diesel engine.
5. The series common rail assembly of claim 1, wherein the second oil access port of the second common rail is not machined or plugged with a plug.
6. The tandem common rail assembly according to claim 3, further comprising a third common rail, a second high pressure oil pipe and two second plugs, the third common rail having the same structure as the first common rail and the second common rail; a second oil inlet and outlet interface of the second common rail pipe is connected with the first oil inlet and outlet interface of the third common rail pipe through the second high-pressure oil pipe; the second end cap is respectively plugged at the second end of the second common rail pipe and the first end of the third common rail pipe; the pressure sensor is connected to a second end of the third common rail tube.
7. The tandem common rail assembly according to claim 1, wherein the first oil inlet and outlet port of the first common rail is connected to an outlet of a high pressure oil pump or is not machined or plugged with a plug.
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| CN202111221750.8A CN113790118A (en) | 2021-10-20 | 2021-10-20 | Serial-type common rail pipe assembly |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111221750.8A CN113790118A (en) | 2021-10-20 | 2021-10-20 | Serial-type common rail pipe assembly |
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| CN113790118A true CN113790118A (en) | 2021-12-14 |
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| CN202111221750.8A Pending CN113790118A (en) | 2021-10-20 | 2021-10-20 | Serial-type common rail pipe assembly |
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| US20050115545A1 (en) * | 2003-11-28 | 2005-06-02 | Denso Corporation | Fuel injection device having two separate common rails |
| CN102782301A (en) * | 2010-03-05 | 2012-11-14 | 卡特彼勒公司 | Range of engines using common rail fuel system with pump and rail assemblies having common components |
| CN207847839U (en) * | 2017-09-25 | 2018-09-11 | 中国重汽集团重庆燃油喷射系统有限公司 | Oil supply structure for high-pressure common-rail fuel system |
| CN112555077A (en) * | 2020-12-03 | 2021-03-26 | 一汽解放汽车有限公司 | Common rail pipe and diesel engine high-pressure oil supply system |
| CN214118361U (en) * | 2020-12-18 | 2021-09-03 | 恒睿汽车电子科技(邳州)有限公司 | Novel high-pressure oil rail |
| CN113090427A (en) * | 2021-04-26 | 2021-07-09 | 无锡威孚高科技集团股份有限公司 | Electric control pressure relief type electric control fuel oil system |
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