Centralized high-pressure common rail system

Abstract

The invention relates to the field of oil pumps, in particular to a centralized high-pressure common rail system. The common rail system comprises a PVC valve, a right cross rail connecting pipe, a left cross rail connecting pipe, a right high-pressure common rail, a left high-pressure common rail, a high-pressure oil pipe A, a high-pressure oil pipe B, a high-pressure oil pipe C, a safety valve and a rail pressure sensor, one side of the PVC valve is communicated with the right high-pressure common rail through the right cross rail connecting pipe, and the other side of the PVC valve is communicated with the left high-pressure common rail through the left cross rail connecting pipe. And a rail pressure sensor is mounted at the end of the right high-pressure common rail. The left high-pressure common rail and the right high-pressure common rail are connected at the rear end of the diesel engine, and it is guaranteed that oil pressure in oil cavities of the left high-pressure common rail and the right high-pressure common rail tends to be consistent; the high-pressure common rail is of a double-layer pipe structure, and the high-pressure oil pipe and the high-pressure common rail are connected and sealed through a ball head. The high-pressure common rail inner pipe is an integral steel pipe, and the high-pressure common rail outer pipe is a sectional steel pipe, so that the high-pressure common rail has better safety and leakproofness.

Description

Technical Field

[0001] The invention relates to the field of oil pumps, in particular to a centralized high-pressure common rail system. Background Art

[0002] The high-pressure common rail system is a fuel supply system that completely separates the generation of injection pressure and the injection process in a closed-loop system consisting of a high-pressure oil pump, a pressure sensor, and an electronic control unit (ECU). The existing decentralized high-pressure common rail system has a wide variety of high-pressure pipelines, and the rail pressure on the left and right sides of the diesel engine fluctuates greatly, the rail pressure is unstable, and it is not convenient for daily maintenance. Summary of the invention

[0003] In order to overcome the shortcomings of the existing high-pressure common rail system, which is unstable and inconvenient to maintain, the present invention provides a centralized high-pressure common rail system.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a centralized high-pressure common rail system, including a PVC valve, a right cross-rail connecting pipe, a left cross-rail connecting pipe, a right high-pressure common rail, a left high-pressure common rail, a high-pressure oil pipe A, a high-pressure oil pipe B, a high-pressure oil pipe C, a safety valve, and a rail pressure sensor. One side of the PVC valve is connected to the right high-pressure common rail through the right cross-rail connecting pipe, and the other side of the PVC valve is connected to the left high-pressure common rail through the left cross-rail connecting pipe. A rail pressure sensor is installed at the end of the right high-pressure common rail, and a safety valve is installed at the end of the left high-pressure common rail. Several high-pressure oil pipes A, several high-pressure oil pipes B, and several high-pressure oil pipes C are connected to the right high-pressure common rail and the left high-pressure common rail.

[0005] According to another embodiment of the present invention, the right high-pressure common rail and the left high-pressure common rail are further comprised of an outer tube, an inner tube, a conversion joint, and a retaining spring, the outer tube is composed of several sections of tube bodies connected to each other, the inner tube is placed inside the outer tube, a leakage oil channel is provided between the outer tube and the inner tube, conversion joints are provided at both ends of the outer tube, and retaining springs are provided on the conversion joints.

[0006] According to another embodiment of the present invention, a ball joint is further provided at the connection point of adjacent outer tubes, a positioning screw sleeve is provided on the inner tube, the ball joint is positioned on the outer tube by the positioning screw sleeve, the ball joint is connected to the inner cavity of the inner tube, and the tail ends of the high-pressure oil pipe A, the high-pressure oil pipe B, and the high-pressure oil pipe C are respectively connected to the ball joint.

[0007] According to another embodiment of the present invention, an O-ring is further provided between the outer tube and the ball joint.

[0008] According to another embodiment of the present invention, the inner wall of the ball joint is provided with a plurality of oil grooves, and the inner wall of the ball joint is in direct contact with the inner tube.

[0009] According to another embodiment of the present invention, the outer tube is provided with a plurality of oil grooves 2 on the inner wall thereof.

[0010] According to another embodiment of the present invention, the PVC valve is further provided with a pressure relief hole and a screw plug.

[0011] According to another embodiment of the present invention, the PVC valve is further fixed on a connecting block bracket, and the connecting block bracket is fixedly connected to the machine body by bolts.

[0012] According to another embodiment of the present invention, the right cross-rail connecting pipe and the left cross-rail connecting pipe are further fixedly connected to the machine body through pipe clamp assemblies respectively.

[0013] According to another embodiment of the present invention, the right high-pressure common rail and the left high-pressure common rail are further fixedly connected to the engine body via fixing brackets respectively.

[0014] The beneficial effects of the present invention are that the left and right high-pressure common rails are connected at the rear end of the diesel engine through the left and right high-pressure common rails to ensure that the oil pressure in the oil chambers of the left and right high-pressure common rails tends to be consistent; the high-pressure common rail adopts a double-layer tube structure, and the high-pressure oil pipe and the high-pressure common rail are connected and sealed with a ball head; the inner tube of the high-pressure common rail adopts an integral steel tube, and the outer tube of the high-pressure common rail adopts a segmented steel tube, which has better safety and sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a schematic structural diagram of the right high-pressure common rail of the present invention; Figure 3 is a schematic structural diagram of a ball joint of the present invention; In the figure, 1. PVC valve, 2. right cross-rail connecting pipe, 3. left cross-rail connecting pipe, 4. right high-pressure common rail, 5. left high-pressure common rail, 6. high-pressure oil pipe A, 7. high-pressure oil pipe B, 8. high-pressure oil pipe C, 9. safety valve, 10. rail pressure sensor, 11. oil tank 2, 12. pressure relief hole, 13. screw plug, 14. connecting block bracket, 15. pipe clamp assembly, 16. fixed bracket, 41. outer tube, 42. inner tube, 43. conversion joint, 44. retaining ring, 45. ball joint, 46. oil tank 1, 47. positioning screw sleeve, 48. O-ring. DETAILED DESCRIPTION

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2is a schematic structural diagram of the right high-pressure common rail of the present invention; Figure 3 It is a structural schematic diagram of a ball joint of the present invention.

[0018] As attached Figure 1 As shown, a centralized high-pressure common rail system includes a PVC valve 1, a right cross-rail connecting pipe 2, a left cross-rail connecting pipe 3, a right high-pressure common rail 4, a left high-pressure common rail 5, a high-pressure oil pipe A6, a high-pressure oil pipe B7, a high-pressure oil pipe C8, a safety valve 9, and a rail pressure sensor 10. One side of the PVC valve 1 is connected to the right high-pressure common rail 4 through the right cross-rail connecting pipe 2, and the other side of the PVC valve 1 is connected to the left high-pressure common rail 5 through the left cross-rail connecting pipe 3. The rail pressure sensor 10 is installed at the end of the right high-pressure common rail 4, and the safety valve 9 is installed at the end of the left high-pressure common rail 5. The right high-pressure common rail 4 and the left high-pressure common rail 5 are both connected with a plurality of high-pressure oil pipes A6, a plurality of high-pressure oil pipes B7, and a plurality of high-pressure oil pipes C8.

[0019] The rear end of the diesel engine connects the right high-pressure common rail 4 and the left high-pressure common rail 5 to ensure that the oil pressures in the high-pressure oil chambers of the right high-pressure common rail 4 and the left high-pressure common rail 5 tend to be consistent.

[0020] As attached Figure 2 As shown, the right high-pressure common rail 4 and the left high-pressure common rail 5 are both composed of an outer tube 41, an inner tube 42, a conversion joint 43, and a retaining spring 44. The outer tube 41 is composed of several sections of interconnected tubes. The inner tube 42 is placed inside the outer tube 41. A leakage oil channel is provided between the outer tube 41 and the inner tube 42. Conversion joints 43 are provided at both ends of the outer tube 41, and retaining springs 44 are provided on the conversion joints 43. The retaining springs 44 can prevent the outer tube 41 from escaping. The leakage oil channel is used for the leakage channel of high-pressure fuel. The inner cavity of the inner tube 42 is a high-pressure oil cavity.

[0021] A ball joint 45 is provided at the connection between adjacent outer tubes 41, and a positioning screw sleeve 47 is provided on the inner tube 42. The ball joint 45 is positioned on the outer tube 41 through the positioning screw sleeve 47. The ball joint 45 is connected to the inner cavity of the inner tube 42, and the tail ends of the high-pressure oil pipe A6, the high-pressure oil pipe B7, and the high-pressure oil pipe C8 are respectively connected to the ball joint 45.

[0022] The outer tube 41 and the inner tube 42 form a double-layer tube structure. The high-pressure oil pipe A6, the high-pressure oil pipe B7, the high-pressure oil pipe C8 are connected and sealed with the right high-pressure common rail 4 and the left high-pressure common rail 5 by a ball joint 45; the inner tube 42 adopts an integral steel pipe, and the outer tube 41 adopts a segmented steel pipe, which has better safety, sealing and assembly processability.

[0023] An O-ring 48 is disposed between the outer tube 41 and the ball joint 45 . The O-ring 48 can improve the sealing performance between the outer tube 41 and the ball joint 45 .

[0024] As attached Figure 3As shown, a plurality of oil grooves 46 are provided on the inner wall of the ball joint 45 , and the inner wall of the ball joint 45 is in direct contact with the inner tube 42 .

[0025] A plurality of oil grooves 11 are provided on the inner wall of the outer tube 41 .

[0026] Since the direct contact between the ball joint 45 and the inner tube 42 will cause the leakage oil passage to be unable to communicate, an oil groove 46 is provided to allow the leakage oil passage to communicate.

[0027] The PVC valve 1 is provided with a pressure relief hole 12 and a screw plug 13 .

[0028] The PVC valve 1 is fixed on the connecting block bracket 14, and the connecting block bracket 14 is fixedly connected to the machine body by bolts.

[0029] The right cross-rail connecting pipe 2 and the left cross-rail connecting pipe 3 are fixedly connected to the machine body through pipe clamp assemblies 15 respectively.

[0030] The right high-pressure common rail 4 and the left high-pressure common rail 5 are fixedly connected to the engine body via fixing brackets 16 .

[0031] After the fuel is pressurized by four electronically controlled pumps, it enters the corresponding high-pressure oil pipes A6, and then enters the high-pressure oil chambers in the right high-pressure common rail 4 and the left high-pressure common rail 5 through the high-pressure oil pipe A6. The high-pressure oil chamber has a large enough volume to serve as a pressure storage chamber for the injector to balance the pressure and reduce oil pressure fluctuations; the high-pressure oil in the high-pressure oil chamber enters the corresponding injector through the high-pressure oil pipes B7 and C8 to perform fuel injection; the right cross-rail connecting pipe 2 and the left cross-rail connecting pipe 3 connect the right high-pressure common rail 4 and the left high-pressure common rail 5 through the connecting block The rail pressure sensor 10 is used to detect the pressure of the high-pressure oil chamber. The safety valve 9 is for safety. When the diesel engine is abnormal or fails, the pressure in the high-pressure oil chamber exceeds the set value, and the safety valve opens to quickly unload the high-pressure fuel in the high-pressure oil chamber to prevent the pipeline from bursting. The PVC valve 1 is mainly used to release the high-pressure fuel remaining in the high-pressure oil chamber through the pressure relief hole 12 after the diesel engine is stopped, so as to protect the pipeline and facilitate the maintenance and repair of the pipeline.

Claims

1. A centralized high-pressure common rail system, characterized in that it includes A PVC valve (1), a right cross-rail connecting pipe (2), a left cross-rail connecting pipe (3), a right high-pressure common rail (4), a left high-pressure common rail (5), a high-pressure oil pipe A (6), a high-pressure oil pipe B (7), a high-pressure oil pipe C (8), a safety valve (9), and a rail pressure sensor (10). One side of the PVC valve (1) is connected to the right high-pressure common rail (4) through the right cross-rail connecting pipe (2), and the other side of the PVC valve (1) is connected to the left high-pressure common rail (5) through the left cross-rail connecting pipe (3). The rail pressure sensor (10) is installed at the end of the right high-pressure common rail (4), and the safety valve (9) is installed at the end of the left high-pressure common rail (5). The right high-pressure common rail (4) and the left high-pressure common rail (5) are both connected to a plurality of high-pressure oil pipes A (6), a plurality of high-pressure oil pipes B (7), and a plurality of high-pressure oil pipes C (8).

2. The centralized high-pressure common rail system according to claim 1 is characterized in that: The right high-pressure common rail (4) and the left high-pressure common rail (5) both comprise an outer tube (41), an inner tube (42), a conversion joint (43), and a retaining spring (44); the outer tube (41) comprises a plurality of tube sections connected to each other; the inner tube (42) is disposed inside the outer tube (41); an oil leakage passage is provided between the outer tube (41) and the inner tube (42); conversion joints (43) are provided at both ends of the outer tube (41); and retaining springs (44) are provided on the conversion joints (43).

3. The centralized high-pressure common rail system according to claim 2 is characterized in that: A ball joint (45) is provided at the joint of adjacent outer tubes (41), a positioning screw sleeve (47) is provided on the inner tube (42), the ball joint (45) is positioned on the outer tube (41) by the positioning screw sleeve (47), the ball joint (45) is communicated with the inner cavity of the inner tube (42), and the tail ends of the high-pressure oil pipe A (6), the high-pressure oil pipe B (7), and the high-pressure oil pipe C (8) are respectively connected to the ball joint (45).

4. The centralized high-pressure common rail system according to claim 2 is characterized in that: An O-type sealing ring (48) is provided between the outer tube (41) and the ball joint (45).

5. The centralized high-pressure common rail system according to claim 3 is characterized in that: The inner wall of the ball joint (45) is provided with a plurality of oil grooves (46), and the inner wall of the ball joint (45) is in direct contact with the inner tube (42).

6. The centralized high-pressure common rail system according to claim 2 is characterized in that: A plurality of oil grooves 2 (11) are provided on the inner wall of the outer tube (41).

7. The centralized high-pressure common rail system according to claim 1 is characterized in that: The PVC valve (1) is provided with a pressure relief hole (12) and a screw plug (13).

8. The centralized high-pressure common rail system according to claim 1 is characterized in that: The PVC valve (1) is fixed on a connecting block bracket (14), and the connecting block bracket (14) is fixedly connected to the machine body by bolts.

9. The centralized high-pressure common rail system according to claim 1 is characterized in that: The right cross-rail connecting pipe (2) and the left cross-rail connecting pipe (3) are respectively fixedly connected to the machine body via pipe clamp assemblies (15).

10. The centralized high-pressure common rail system according to claim 1, characterized in that: The right high-pressure common rail (4) and the left high-pressure common rail (5) are respectively fixedly connected to the machine body via fixing brackets (16).

Images