CN217501847U

CN217501847U - Low-pressure fuel oil backflow collecting device

Info

Publication number: CN217501847U
Application number: CN202221889991.XU
Authority: CN
Inventors: 赵继东; 邢首辰; 张伟勋; 胡云龙; 宋双占; 缪青; 崔振翊; 牛新朋; 杨航; 孟雪峰; 冯存光
Original assignee: First Tractor Co Ltd
Current assignee: First Tractor Co Ltd
Priority date: 2022-07-22
Filing date: 2022-07-22
Publication date: 2022-09-27
Anticipated expiration: 2032-07-22

Abstract

The utility model relates to the field of engines and related systems, in particular to a low-pressure fuel backflow collecting device, which comprises a low-pressure fuel collecting device, an O-shaped sealing ring, a combined sealing washer, a hinge bolt and a fastening bolt, a fuel cavity is arranged in the low-pressure fuel oil collector, a connecting hole I and a connecting hole II are arranged on the front end surface of the low-pressure fuel oil collector, the connecting hole III is arranged on the right side surface of the low-pressure fuel oil collector, the whole structure of the low-pressure fuel oil backflow collecting device of the utility model has small volume, small space occupation and high reliability, the low-pressure fuel oil backflow collecting device is arranged on the cylinder cover, the low-pressure fuel oil of the oil injector, the oil injection pump and the oil rail can flow into the oil tank quickly through the collecting device, the engine oil return pipeline has the advantages of compact structure, short pipeline and few interfaces, effectively reduces the risk of fuel oil leakage, and improves the operation reliability of the engine.

Description

Low-pressure fuel oil backflow collecting device

Technical Field

The utility model belongs to the technical field of engine and the relevant system and specifically relates to a low pressure fuel backward flow gui ji device is related to.

Background

The low-pressure fuel oil pipeline of an electric control high-pressure common rail engine (engine for short) mainly comprises a low-pressure fuel oil inlet pipeline and a low-pressure fuel oil return pipeline, wherein the low-pressure fuel oil return pipeline is composed of a fuel injection pump return pipe, a fuel injector return pipe, a fuel rail return pipe, a fuel tank return pipe and the like, in the prior art design, the low-pressure fuel oil return pipeline mainly collects return oil at three positions of a fuel injection pump, a fuel injector and a fuel rail to a section of intersection pipeline or a joint, and then is connected with the intersection pipeline or the joint through a fuel pipe, all low-pressure fuel oil flows to a fuel tank, the intersection pipeline or the joint is generally arranged at the middle part or the lower part of the engine, and the low-pressure fuel oil return pipeline is closer to the fuel tank, but the structure has the following defects when being used specifically:

1. the arrangement of a low-pressure fuel oil return pipeline is not compact, the pipeline is long, the number of interfaces is large, the fuel oil leakage condition is easy to generate, and the reliability of the whole machine is poor;

2. the low-pressure fuel oil return pipeline needs to be provided with a plurality of protective laminating fixing points, and is complicated and inconvenient to install, assemble and maintain in daily life;

3. the whole arrangement of the low-pressure fuel oil return pipeline is messy and is not beautiful.

Disclosure of Invention

The utility model aims at providing a low pressure fuel backward flow gui ji device, it can install on the engine cylinder cap, flow into the oil tank with the low pressure fuel of sprayer, injection pump and oil rail through gui ji device fast, and then make the engine return oil line compact structure, the pipeline is short, the interface is few, has reduced the fuel leakage risk effectively, has improved the operational reliability of engine;

in order to achieve the above purpose, the utility model adopts the following technical scheme:

the low-pressure fuel backflow collecting device comprises a low-pressure fuel collecting device, an O-shaped sealing ring, a hinge bolt and a fastening bolt, wherein a fuel cavity is arranged inside the low-pressure fuel collecting device, a connecting hole I and a connecting hole II are formed in the front end face of the low-pressure fuel collecting device, a connecting hole III is formed in the right side face of the low-pressure fuel collecting device, the connecting hole I, the connecting hole II and the connecting hole III are communicated with the fuel cavity through oil ducts, mounting holes are formed in the upper end portion and the lower end portion of the low-pressure fuel collecting device, the fastening bolt is mounted in the mounting holes, the low-pressure fuel collecting device is mounted on a cylinder cover of an engine through the fastening bolt, connecting ports of threaded connection structures are formed in the connecting hole I, the connecting hole II and the connecting hole III, and the hinge bolt is mounted in the connecting hole I, the connecting hole II and the connecting hole III in a screwing mode through threads.

Furthermore, the low-pressure fuel oil collector is integrally of a T-shaped cubic structure.

Furthermore, four oil ducts are arranged in the low-pressure fuel oil collector, and each oil duct is communicated with the sealing surfaces on the front end surface, the rear end surface and the right side surface of the low-pressure fuel oil collector respectively.

Furthermore, the center of an oil duct communicated with the rear end face of the low-pressure fuel oil collector is not overlapped with the vertical center of the fuel oil cavity, and the offset A between the two centers is 1-6 mm.

Furthermore, a sealing plane and an annular sealing groove are arranged on the rear end face of the low-pressure fuel oil collector, the sealing plane is attached to a mounting plane on an engine cylinder cover, and the center of the sealing groove is overlapped with the center of an oil passage hole penetrating through the rear end face of the low-pressure fuel oil collector.

Furthermore, an O-shaped sealing ring for sealing the upper sealing plane of the rear end face and the upper mounting plane of the engine cylinder cover is mounted in the annular sealing groove, and the O-shaped sealing ring is respectively contacted with the circumference of the annular sealing groove, the bottom of the annular sealing groove and the mounting plane of the cylinder cover and surrounds the joint of the oil duct and the oil return passage of the oil sprayer to form a closed sealing cavity.

Furthermore, the number of the mounting holes is two, the two mounting holes are distributed at the upper end and the lower end of the low-pressure fuel oil collector, the distance between the two mounting holes and the vertical center of the fuel oil cavity is equal, and the center distance B is 15-30 mm.

Further, an oil injection pump oil return pipe, an oil rail oil return pipe and an oil tank oil return pipe are arranged on the outer side of the low-pressure fuel oil collector, the oil tank oil return pipe, the oil injection pump oil return pipe and the oil rail oil return pipe are respectively installed at a connecting hole I, a connecting hole II and a connecting hole III of the low-pressure fuel oil collector through a hinged bolt and a combined sealing washer, and an oil injector oil return hole, the oil injection pump oil return pipe, the oil rail oil return pipe, the oil tank oil return pipe and the low-pressure fuel oil collector form a complete low-pressure fuel oil return passage together.

The utility model has the advantages that: the low-pressure fuel oil backflow collecting device of the utility model has the advantages of simple overall structure design and convenient assembly and disassembly, can be integrally arranged on the cylinder cover of the engine through the fastening bolt, can collect the low-pressure fuel oil in the fuel injection pump, the fuel injector and the oil rail together when in use, and can guide the low-pressure fuel oil to flow back to the fuel tank through the fuel tank return oil pipe, the low-pressure fuel oil backflow collecting device of the utility model has the characteristics of small overall structure volume, small space occupation and high reliability, and can be arranged on the cylinder cover, and the low-pressure fuel oil of the fuel injector, the fuel injection pump and the oil rail can quickly flow into the fuel tank through the collecting device, so that the oil return pipeline of the engine has compact structure, short pipeline and few interfaces, effectively reduces the risk of fuel oil leakage, improves the operational reliability of the engine, and reduces the manufacturing and protection cost of the engine, meanwhile, the difficulty of assembly and maintenance of the engine is reduced.

Drawings

FIG. 1 is a schematic view of the disassembled installation structure of the low-pressure fuel oil reflux collecting device of the present invention;

fig. 2 is a schematic structural view of the front end face of the low-pressure fuel collector of the low-pressure fuel backflow collecting device of the present invention;

FIG. 3 is a cross-sectional view taken along line Z-Z of FIG. 2;

fig. 4 is a schematic structural view of the rear end face of the low-pressure fuel collector of the low-pressure fuel return collecting device of the present invention;

fig. 5 is a schematic view of the right side structure of the low-pressure fuel return collecting device of the present invention;

FIG. 6 is a schematic plan view of a low pressure fuel collector mounted on an engine cylinder head;

fig. 7 is an installation schematic diagram of an oil return pipe of the oil injection pump, an oil rail oil return pipe and an oil tank oil return pipe.

The reference numbers in the figures are: 1. An O-shaped sealing ring; 2. a low-pressure fuel oil collector; 3. combining sealing gaskets; 4. a hinge bolt; 5. a cylinder cover; 6. an oil return pipe of the oil injection pump; 7. an oil rail return pipe; 8. an oil return pipe of the oil tank; 9. fastening a bolt; 205. mounting holes; 210. an oil pipe mounting plane I; 211. connecting holes I; 212. a connecting hole II; 216. an oil duct I; 217. an oil duct II; 220. sealing the plane; 226. An oil duct III; 227. an annular seal groove; 230. an oil pipe mounting plane II; 231. Connecting holes III; 236. an oil duct IV; 250. a fuel oil chamber; 510. a low-pressure fuel oil collector mounting plane; 501. oil injector oil return holes 502 and mounting screw holes.

Detailed Description

In order to make the technical solution of the present invention better understood, the present invention is further described in detail below with reference to the drawings and the detailed description of the specification, and it should be noted that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly or indirectly connected to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "left" and "right" used in this specification to denote orientation are used with reference to a particular structure shown in the drawings, and do not constitute a limitation on the structure.

Specific example 1: as shown in the attached drawings 1 and 2 of the specification, in order to solve the problems of the low-pressure fuel oil return pipeline structure in the prior art, such as incompact pipeline arrangement, long pipeline, more interfaces, easy fuel oil leakage, poor reliability of the whole machine and the like, the utility model designs and provides a low-pressure fuel oil return collecting device which can be arranged on a cylinder cover of an engine and can be used for collecting low-pressure fuel oil in an oil injector, an oil rail and an oil injection pump together and guiding the low-pressure fuel oil to a fuel tank through an oil tank return pipe, the low-pressure fuel oil return collecting device of the utility model comprises a low-pressure fuel oil collector 2, an O-shaped sealing ring 1, a combined sealing washer 3, a hinged bolt 4 and a fastening bolt 9, wherein the low-pressure fuel oil collector 2 is integrally of a T-shaped cubic structure, and a fuel oil cavity 250 for overflowing oil is arranged inside the low-pressure fuel oil collector 2, a connecting hole I211 and a connecting hole II212 are formed in the front end face of the low-pressure fuel oil collector 2, a connecting hole III231 is formed in the right side face of the low-pressure fuel oil collector 2, the fuel oil cavity 250 is communicated with (four) oil ducts distributed in an 'upper' shape, each oil duct is communicated with the peripheral mounting end face of the low-pressure fuel oil collector 2, the number of the oil ducts is four, the fuel oil cavity 250 is communicated with the oil pipe mounting plane I210 through the oil ducts I216 and the oil duct II217, the fuel oil cavity 250 is communicated with the sealing plane 220 through the oil duct III226, and the fuel oil cavity 250 is communicated with the oil pipe mounting plane II230 through the oil duct IV 236; except for the orifice of the oil duct III226, the orifices of the oil ducts I216, II217, and IV236 are provided with connection ports of a threaded connection structure, and the connection holes I211 and II212 are perpendicularly intersected with the oil pipe installation plane I210, and the connection hole III231 is perpendicularly intersected with the oil pipe installation plane II 230.

As shown in fig. 4 in the specification, a sealing plane 220 and an annular sealing groove 227 are arranged at the rear end face of the low-pressure fuel collector 2, and the center of the annular sealing groove 227 is overlapped with the center of the oil passage III 226; the sealing plane 220 is attached to a low-pressure fuel oil collector mounting plane 510 (cylinder cover); the oil duct III226 is communicated with an oil sprayer oil return duct 501 (a cylinder cover), the O-shaped sealing ring 1 is arranged in the annular sealing groove 227 and is respectively attached to the circumferential surface of the low-pressure fuel oil collector mounting plane 510 and the circumferential surface of the annular sealing groove 227 and the bottom plane of the groove, and the O-shaped sealing ring surrounds the interface of the oil duct III226 and the oil sprayer oil return duct 501 to form a closed sealing cavity, so that the low-pressure fuel oil returned by the oil sprayer can completely enter the low-pressure fuel oil collector 2, it needs to be noted that the center of the oil duct III226 is not overlapped with the vertical center of the fuel oil cavity 250, the offset A between the centers is 1 mm-6 mm, and the outer contour surface of the low-pressure fuel oil collector 2 is designed in a shape following manner, is in smooth transition, compact in structure and attractive and elegant.

As shown in the accompanying

drawings

2 and 4 of the specification, the low-pressure fuel oil collector 2 is provided with two mounting holes 205, and the mounting holes 205 are distributed at the upper end and the lower end of the low-pressure fuel oil collector 2; the two mounting holes 205 are equal to the vertical center of the fuel cavity 250, and the center distance B is 15-30 mm.

As shown in the specification, fig. 6 and the specification, fig. 7, the fastening bolt 9 passes through the mounting hole 205 and is screwed into a mounting screw hole 502 on the cylinder head to fix the low-pressure fuel collector 2 on the engine cylinder head 5; the combined seal ring 3 is respectively attached to two side faces of a pipe joint of an oil injection pump oil return pipe 6, an oil rail oil return pipe 7 and an oil tank oil return pipe 8, the hinge bolt 4 respectively penetrates through the pipe joint of the oil return pipe and the combined seal ring 3 to be connected with a connecting port on the low-pressure fuel oil collector 2, and the oil injection pump oil return pipe 6, the oil rail oil return pipe 7 and the oil tank oil return pipe 8 are fixed on the low-pressure fuel oil collector 2 to form a complete low-pressure fuel oil backflow passage, so that backflow low-pressure fuel oil completely enters the oil tank, and leakage is avoided. In this embodiment, the low-pressure fuel backflow collecting device of the utility model has the characteristics of compact structure, high reliability, elegant appearance and the like, and can be installed on the cylinder cover 5 of the engine by an operator, and when in use, the low-pressure fuel that flows back from the fuel injector, the fuel injection pump and the fuel rail can flow into the fuel tank quickly after being collected by the collecting device of the utility model, so that the whole structure of the engine is simple, the pipelines are short, the interfaces are few, the installation space is saved, and the risk of fuel leakage is reduced; meanwhile, the manufacturing and protection cost of the pipeline is reduced, and the assembly and the maintenance of the engine are facilitated; thereby effectively improving the running reliability and the adaptability of the engine. The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention.

Claims

1. The low-pressure fuel backflow collecting device is characterized by comprising a low-pressure fuel collecting device (2), an O-shaped sealing ring (1), a combined sealing washer (3), a hinge bolt (4) and a fastening bolt (9), wherein a fuel cavity (250) is arranged inside the low-pressure fuel collecting device (2), a connecting hole I (211) and a connecting hole II (212) are formed in the front end face of the low-pressure fuel collecting device (2), a connecting hole III (231) is formed in the right side face of the low-pressure fuel collecting device (2), the connecting hole I (211), the connecting hole II (212) and the connecting hole III (231) are communicated with the fuel cavity (250) through oil ducts, mounting holes (205) are formed in the upper end and the lower end of the low-pressure fuel collecting device (2), the fastening bolt (9) is installed in the mounting holes (205), and the low-pressure fuel collecting device (2) is installed on an engine cylinder cover (5) through the fastening bolt (9), all be provided with the connector of threaded connection structure on connecting hole I (211), connecting hole II (212) and connecting hole III (231), articulated bolt (4) are installed on connecting hole I (211), connecting hole II (212) and connecting hole III (231) through screw thread fit mode knob.

2. The low-pressure fuel return collection device according to claim 1, wherein the low-pressure fuel collector (2) is integrally formed in a T-shaped cubic structure.

3. The low-pressure fuel backflow collecting device according to claim 1, wherein four oil passages are formed in the low-pressure fuel collecting device (2), and each oil passage is communicated with the sealing surfaces on the front end surface, the rear end surface and the right side surface of the low-pressure fuel collecting device (2).

4. The low-pressure fuel oil backflow collecting device according to claim 3, wherein the center of the oil passage communicated with the rear end surface of the low-pressure fuel oil collecting device (2) is not coincident with the vertical center of the fuel oil cavity (250), and the offset A between the centers is 1 mm-6 mm.

5. The low-pressure fuel backflow collecting device according to claim 1, wherein a sealing plane (220) and an annular sealing groove (227) are arranged on the rear end face of the low-pressure fuel collecting device (2), the sealing plane (220) is attached to a mounting plane on an engine cylinder cover (5), and the center of the sealing groove coincides with the center of an oil channel hole penetrating through the rear end face of the low-pressure fuel collecting device (2).

6. The low-pressure fuel oil backflow collecting device is characterized in that an O-shaped sealing ring (1) used for sealing a sealing plane (220) on the rear end face and a mounting plane on an engine cylinder cover (5) is mounted in the annular sealing groove (227), the O-shaped sealing ring (1) is respectively in contact with the circumference of the annular sealing groove (227), the bottom of a groove and the mounting plane of the cylinder cover (5), and surrounds the interface between an oil passage and an oil injector oil return passage to form a closed sealing cavity.

7. The low-pressure fuel backflow collecting device as claimed in claim 6, wherein the number of the mounting holes (205) is two, the two mounting holes (205) are distributed at the upper end and the lower end of the low-pressure fuel collecting device (2), the distance between the two mounting holes (205) and the vertical center of the fuel cavity (250) is equal, and the central distance B is 15 mm-30 mm.

8. The low-pressure fuel backflow collecting device according to claim 1, wherein a fuel injection pump return pipe (6), a fuel rail return pipe (7) and a fuel tank return pipe (8) are arranged on the outer side of the low-pressure fuel collecting device (2), the fuel tank return pipe (8), the fuel injection pump return pipe (6) and the fuel rail return pipe (7) are respectively installed at a connecting hole I (211), a connecting hole II (212) and a connecting hole III (231) on the low-pressure fuel collecting device (2) through a hinge bolt (4) and a combined sealing gasket (3), and the fuel injector return hole (501), the fuel injection pump return pipe (6), the fuel rail return pipe (7) and the fuel tank return pipe (8) form a complete low-pressure fuel backflow passage together with the low-pressure fuel collecting device (2).