High-pressure common rail pipe of multi-cylinder diesel engine

Abstract

The utility model belongs to the technical field of common rail pipes, and particularly relates to a multi-cylinder diesel engine high-pressure common rail pipe which comprises a connecting header pipe and connecting branch pipes, one end of the connecting header pipe is connected with an oil injection pump, the other end of the connecting header pipe is fixedly connected with a flow divider, and the flow divider comprises a shell and a top cover. The side wall of the shell is fixedly connected with a plurality of oil outlet ends which are distributed at equal intervals; the height of the adjusting ring is adjusted by rotating the first threaded rotating rod, so that the opening size of the oil outlet end is controlled, the oil outlet amount is adjusted, the baffle abuts against the top cover through the elastic force of the first telescopic spring to block the connecting header pipe, and oil can be discharged only when the oil pressure in the connecting header pipe reaches a certain value. Therefore, each connecting branch pipe can discharge oil at the same time, the oil discharge amount is the same, and compared with the prior art, the oil discharge amount of each connecting branch pipe can be accurately and synchronously controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of common rail pipes, in particular to a high-pressure common rail pipe for a multi-cylinder diesel engine. Background Art

[0002] Diesel engines are divided into multi-cylinder and single-cylinder types. When a multi-cylinder diesel engine uses a fuel injection pump for fuel injection, a common rail pipe is required to supply fuel to multiple cylinders simultaneously, so that each cylinder of the multi-cylinder diesel engine can be supplied with fuel and operate normally.

[0003] When the existing common rail pipe of a diesel engine fuel injection pump is in use, when the oil pressure ejected by the fuel injection pump is too high, it will cause excessive oil intake inside the diesel engine and waste. Therefore, the existing common rail pipe of a diesel engine fuel injection pump cannot well meet people's usage requirements.

[0004] The existing Chinese patent with the publication number CN212803445U discloses a common rail pipe for a diesel engine fuel injection pump, including a connection head and a sealing head. A one-way pipe is connected below the connection head. A valve core is connected to the inside of the one-way pipe through a first spring. One side of the connection head is connected to a pipeline through a threaded head, and a threaded sleeve is connected to the upper end of the pipeline. The sealing head is located on the other side of the pipeline. A stop block is arranged inside the pipeline, and a second spring is connected to one side of the stop block. The other side of the second spring is connected to a connection block, and the other side of the connection block is connected to a threaded rod through a bearing. A turning handle is fixed to the other side of the threaded rod. Compared with the existing common diesel engine fuel injection pump common rail pipe, this device has a constant pressure return pipe. When the oil pressure inside the device is too high, it can carry out return pressure relief to prevent excessive pressure from causing too much oil to enter the diesel engine, resulting in the situation that the oil cannot be fully burned and thus causing waste.

[0005] Regarding the above and related existing technologies, the inventor believes that there are often the following defects: The device adjusts the oil outlet pressure by rotating the threaded rod to make the oil output of each pipeline the same. The threaded rod is controlled by manual rotation respectively, and the rotation amplitude is not easy to accurately grasp, making it inconvenient to unify the rotation amplitude of the threaded rod of each pipeline, and making it inconvenient to accurately control the same amount of oil output of each pipeline, which needs to be improved. Therefore, a high-pressure common rail pipe for a multi-cylinder diesel engine is proposed for the above problems. Summary of the Utility Model

[0006] In order to make up for the deficiencies of the existing technology and solve the above-mentioned technical problems, the utility model proposes a high-pressure common rail pipe for a multi-cylinder diesel engine.

[0007] The technical solution adopted by the present utility model to solve its technical problems is as follows: A high-pressure common rail pipe for a multi-cylinder diesel engine according to the present utility model includes a connecting main pipe and connecting branch pipes. One end of the connecting main pipe is connected to an injection pump, and a shunt is fixedly connected to the other end of the connecting main pipe. The shunt includes a housing and a top cover. A plurality of oil outlet ends are fixedly connected to the side wall of the housing at equal intervals. A threaded joint is fixedly connected to the end of the oil outlet end away from the housing. An adjusting assembly is installed inside the housing. The adjusting assembly includes an adjusting ring. A first threaded rotating rod is fixedly connected to the center of the adjusting ring. The first threaded rotating rod is threadedly connected to the housing. An installation cavity is formed at the center of the adjusting ring and the first threaded rotating rod. A first spring telescopic rod is installed inside the installation cavity. The top end of the first spring telescopic rod is fixedly connected to a baffle plate, and the bottom end of the first spring telescopic rod is fixedly connected to a third threaded rotating rod, and the third threaded rotating rod passes through and is threadedly connected to the first threaded rotating rod. When using the common rail pipe of the diesel engine injection pump, the height of the adjusting ring is adjusted by rotating the first threaded rotating rod, so as to control the opening size of the oil outlet end to adjust the oil output. After the adjustment of the adjusting ring is completed, rotate the third threaded rotating rod so that the baffle plate abuts against the top cover. The baffle plate abuts against the top cover through the elastic force of the first spring telescopic rod to block the connecting main pipe, so that the oil pressure in the connecting main pipe can reach a certain value before oil can be discharged. And by rotating the third threaded rotating rod to adjust the compression amplitude of the first spring telescopic rod, the oil discharge pressure can be controlled, so that each connecting branch pipe can discharge oil simultaneously and the oil output is the same. Compared with the prior art, the oil output of each connecting branch pipe can be accurately and synchronously controlled.

[0008] Preferably, the housing and the top cover are welded.

[0009] Preferably, one end of the connecting branch pipe is threadedly connected to the threaded joint, and the other end of the connecting branch pipe is connected to the diesel engine.

[0010] Preferably, the adjusting assembly further includes a sealing cap, and the sealing cap is threadedly connected to the threaded joint for blocking the vacant oil outlet end. Multiple oil outlet ends can be connected to multiple connecting branch pipes, enabling the device to be connected to diesel engines with different numbers of cylinders and improving the practicality of the device. The vacant oil outlet ends are sealed by the sealing caps.

[0011] Preferably, a reflux assembly is installed above the top cover. The reflux assembly includes a reflux end, and the bottom end of the reflux end is fixedly connected to the top cover. When the oil pressure inside the shunt exceeds a certain threshold, the oil pressure pushes the sealing head to slide upward to open the flow passage, so that the oil liquid inside the shunt flows back to the fuel tank.

[0012] Preferably, a threaded connection end is fixedly connected to the upper side wall of the reflux end, and the threaded connection end is connected to the fuel tank through a reflux pipeline.

[0013] Preferably, a conical flow passage is fixedly connected inside the return end, and a conical sealing head is arranged inside the return end.

[0014] Preferably, a second spring telescopic rod is fixedly connected to the top of the sealing head, and the top of the second spring telescopic rod is fixedly connected to a second threaded rotating rod, and the second threaded rotating rod is threadedly connected to the return end. By rotating the second threaded rotating rod, the sealing head descends into the flow passage. The sealing head closes the flow passage by the elastic force of the second spring telescopic rod, and by rotating the second threaded rotating rod to adjust the compression amplitude of the second spring telescopic rod, the oil pressure threshold during the operation of the return assembly can be controlled.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. By rotating the first threaded rotating rod of the present utility model to adjust the height of the adjusting ring, the opening size of the oil outlet end is controlled to adjust the oil output. The baffle blocks the connecting main pipe by the elastic force of the first spring telescopic rod against the top cover, so that the oil pressure in the connecting main pipe can reach a certain value before oil can be discharged, so that each connecting branch pipe can discharge oil simultaneously and with the same oil output. Compared with the prior art, the oil output of each connecting branch pipe can be accurately and synchronously controlled.

[0017] 2. When the oil pressure inside the shunt of the present utility model exceeds a certain threshold, the oil pressure pushes the sealing head to slide upward to open the flow passage, so that the oil inside the shunt flows back to the fuel tank, and by rotating the second threaded rotating rod to adjust the compression amplitude of the second spring telescopic rod, the oil pressure threshold during the operation of the return assembly can be controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0020] Figure 2 It is a schematic diagram of the unfolded structure of the shunt of the present utility model;

[0021] Figure 3 It is a schematic diagram of the structure of the adjusting assembly of the present utility model;

[0022] Figure 4 It is a cross-sectional view of the adjusting ring and the first threaded rotating rod of the present utility model;

[0023] Figure 5This is a schematic structural diagram of the reflux component of the present utility model.

[0024] In the figure: 1. Connecting main pipe; 2. Shunt; 21. Housing; 22. Top cover; 23. Oil outlet end; 24. Threaded joint; 3. Adjusting component; 31. Adjusting ring; 32. First threaded screw rod; 33. Sealing cap; 34. Installation cavity; 35. First spring telescopic rod; 36. Baffle; 37. Third threaded screw rod; 4. Connecting branch pipe; 5. Reflux component; 51. Reflux end; 52. Threaded connection end; 53. Flow channel; 54. Sealing head; 55. Second spring telescopic rod; 56. Second threaded screw rod. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. Embodiment

[0026] Please refer to Figures 1-4 As shown, a high-pressure common rail pipe for a multi-cylinder diesel engine includes a connecting main pipe 1 and a connecting branch pipe 4. One end of the connecting main pipe 1 is connected to a fuel injection pump, and the other end of the connecting main pipe 1 is fixedly connected to a shunt 2. The shunt 2 includes a housing 21 and a top cover 22. A plurality of oil outlet ends 23 are fixedly connected to the side wall of the housing 21 at equal intervals. One end of the oil outlet end 23 away from the housing 21 is fixedly connected to a threaded joint 24. An adjusting component 3 is installed inside the housing 21. The adjusting component 3 includes an adjusting ring 31. A first threaded screw rod 32 is fixedly connected to the center of the adjusting ring 31. The first threaded screw rod 32 is threadedly connected to the housing 21. An installation cavity 34 is provided at the center of the adjusting ring 31 and the first threaded screw rod 32. A first spring telescopic rod 35 is installed inside the installation cavity 34. The top end of the first spring telescopic rod 35 is fixedly connected to a baffle 36, and the bottom end of the first spring telescopic rod 35 is fixedly connected to a third threaded screw rod 37. The third threaded screw rod 37 penetrates and is threadedly connected to the first threaded screw rod 32. When using the common rail pipe of the diesel engine fuel injection pump, by rotating the first threaded screw rod 32, the height of the adjusting ring 31 is adjusted, thereby controlling the opening size of the oil outlet end 23 to adjust the oil output. After the adjusting ring 31 is adjusted, rotate the third threaded screw rod 37 so that the baffle 36 abuts against the top cover 22. The baffle 36 abuts against the top cover 22 by the elastic force of the first spring telescopic rod to block the connecting main pipe 1, so that the oil pressure in the connecting main pipe 1 can reach a certain value before oil can be discharged. And by rotating the third threaded screw rod 37 to adjust the compression amplitude of the first spring telescopic rod 35, the oil discharge pressure can be controlled, so that each connecting branch pipe 4 can discharge oil simultaneously and the oil output is the same, and the oil output of each connecting branch pipe 4 can be accurately and synchronously controlled.

[0027] The housing 21 and the top cover 22 are welded.

[0028] One end of the connecting branch pipe 4 is threadedly connected to the threaded joint 24, and the other end of the connecting branch pipe 4 is connected to the diesel engine.

[0029] The adjusting assembly 3 further includes a sealing cap 33. The sealing cap 33 is threadedly connected to the threaded joint 24 for plugging the vacant oil outlet end 23. Multiple connecting branch pipes 4 can be connected through the multiple oil outlet ends 23, enabling the device to be connected to diesel engines with different numbers of cylinders and improving the practicability of the device. The vacant oil outlet end 23 is sealed by the sealing cap 33. Embodiment

[0030] Comparative Example 1, please refer to Figure 5 As shown, the present utility model provides another implementation manner. A reflux assembly 5 is installed above the top cover 22. The reflux assembly 5 includes a reflux end 51. The bottom end of the reflux end 51 is fixedly connected to the top cover 22. When the internal oil pressure of the diverter 2 exceeds a certain threshold, the oil pressure pushes the sealing head 54 to slide upward to open the flow passage 53, so that the oil inside the diverter 2 flows back to the fuel tank.

[0031] A threaded connection end 52 is fixedly connected to the upper side wall of the reflux end 51. The threaded connection end 52 is connected to the fuel tank through a reflux pipe.

[0032] A conical flow passage 53 is fixedly connected inside the reflux end 51, and a conical sealing head 54 is arranged inside the reflux end 51.

[0033] The top of the sealing head 54 is fixedly connected to a second spring telescopic rod 55. The top end of the second spring telescopic rod 55 is fixedly connected to a second threaded rotating rod 56. The second threaded rotating rod 56 is threadedly connected to the reflux end 51. By rotating the second threaded rotating rod 56, the sealing head 54 descends into the flow passage 53. The sealing head 54 closes the flow passage 53 by the elastic force of the second spring telescopic rod 55, and by rotating the second threaded rotating rod 56 to adjust the compression amplitude of the second spring telescopic rod 55, the oil pressure threshold during the operation of the reflux assembly 5 can be controlled.

[0034] Working principle: When using the common rail pipe of the diesel engine fuel injection pump, the height of the adjusting ring 31 is adjusted by rotating the threaded screw rod 1 32, so as to control the opening size of the oil outlet end 23 to adjust the oil output. After the adjustment of the adjusting ring 31 is completed, rotate the threaded screw rod 3 37 to make the baffle 36 press against the top cover 22. The baffle 36 presses against the top cover 22 through the elastic force of the first spring telescopic rod to block the connecting main pipe 1, so that the oil pressure in the connecting main pipe 1 can reach a certain value before oil can be discharged. And by rotating the threaded screw rod 3 37 to adjust the compression amplitude of the first spring telescopic rod 35, the oil discharge pressure can be controlled, so that each connecting branch pipe 4 can discharge oil simultaneously and the oil output is the same, and the oil output of each connecting branch pipe 4 can be accurately and synchronously controlled.

[0035] By rotating the threaded screw rod 2 56, the sealing head 54 is lowered into the internal part of the flow passage 53. The sealing head 54 presses against and closes the flow passage 53 through the elastic force of the second spring telescopic rod 55. When the internal oil pressure of the diverter 2 exceeds a certain threshold value, the oil pressure pushes the sealing head 54 to slide upward to open the flow passage 53, so that the oil in the diverter 2 flows back to the fuel tank. And by rotating the threaded screw rod 2 56 to adjust the compression amplitude of the second spring telescopic rod 55, the oil pressure threshold value during the operation of the return assembly 5 can be controlled.

[0036] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A high-pressure common rail pipe for a multi-cylinder diesel engine, comprising a connecting main pipe (1) and a connecting branch pipe (4), characterized in that: One end of the connecting manifold (1) is connected to the fuel injection pump, and the other end of the connecting manifold (1) is fixedly connected to a flow divider (2), the flow divider (2) comprising a housing (21) and a top cover (22), a side wall of the housing (21) is fixedly connected to a plurality of equidistantly distributed oil outlets (23), one end of the oil outlet (23) away from the housing (21) is fixedly connected to a threaded joint (24), an adjusting assembly (3) is installed inside the housing (21), the adjusting assembly (3) comprises an adjusting ring (31), the center of the adjusting ring (31) is A threaded rotating rod (32) is fixedly connected at the adjusting ring (31), the threaded rotating rod (32) passes through and is threadedly connected to the housing (21), a mounting cavity (34) is provided at the center of the adjusting ring (31) and the threaded rotating rod (32), a spring telescopic rod (35) is installed inside the mounting cavity (34), a baffle (36) is fixedly connected to the top end of the spring telescopic rod (35), a threaded rotating rod (37) is fixedly connected to the bottom end of the spring telescopic rod (35), and the threaded rotating rod (37) passes through and is threadedly connected to the threaded rotating rod (32).

2. The multi-cylinder diesel engine high pressure common rail pipe according to claim 1, characterized in that: The shell (21) and the top cover (22) are welded.

3. The multi-cylinder diesel engine high pressure common rail pipe according to claim 1, characterized in that: One end of the connecting branch pipe (4) is threadedly connected to the threaded joint (24), and the other end of the connecting branch pipe (4) is connected to the diesel engine.

4. The multi-cylinder diesel engine high pressure common rail pipe according to claim 1, characterized in that: The regulating assembly (3) further comprises a sealing cap (33), wherein the sealing cap (33) is threadedly connected to the threaded joint (24) and is used to seal the vacant oil outlet end (23).

5. The multi-cylinder diesel engine high pressure common rail pipe according to claim 1, characterized in that: A reflux component (5) is installed above the top cover (22), wherein the reflux component (5) comprises a reflux end (51), and the bottom end of the reflux end (51) is fixedly connected to the top cover (22).

6. The multi-cylinder diesel engine high pressure common rail pipe according to claim 5, characterized in that: A threaded connection end (52) is fixedly connected to the upper side wall of the return end (51), and the threaded connection end (52) is connected to the oil tank via a return pipe.

7. The multi-cylinder diesel engine high pressure common rail pipe according to claim 5, characterized in that: A conical circulation channel (53) is fixedly connected to the interior of the return end (51), and a conical sealing head (54) is provided inside the return end (51).

8. The multi-cylinder diesel engine high pressure common rail pipe according to claim 7, characterized in that: The top of the sealing head (54) is fixedly connected to a second spring telescopic rod (55), the top of the second spring telescopic rod (55) is fixedly connected to a second threaded rotary rod (56), and the second threaded rotary rod (56) is threadedly connected to the return end (51).

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