Oil injection pipe of diesel internal combustion engine

Abstract

The utility model provides an oil injection pipe of a diesel internal combustion engine, which relates to the field of oil injection pipes of diesel internal combustion engines, and comprises a pipe body, one end of the pipe body is connected with a connecting end, the other end of the pipe body is connected with an oil injection nozzle, the connecting end comprises a screw joint, one end of the screw joint is provided with a threaded hole, and a circulation hole is arranged in the connecting end. A circulating hole is formed in the pipe body, a connecting groove is formed in one end of the circulating hole, meanwhile, one end of the pipe body is connected into the connecting groove, the oil nozzle comprises a valve body, a needle valve is slidably connected into the valve body, a pressure-bearing conical surface is arranged on the outer side of the needle valve, the needle valve comprises a valve rod, a mold hole is formed in the outer wall of the valve rod, and reinforcing ribs are connected to the outer wall of the valve rod. The needle valve has the effects of enhancing the connection sealing performance and stability and reducing the impact and abrasion of the needle valve.

Description

Technical Field

[0001] This utility model relates to the technical field of diesel internal combustion engine fuel injection pipes, specifically to a diesel internal combustion engine fuel injection pipe. Background Technology

[0002] Existing common diesel engine cooling fuel injection pipes consist of carbon steel pipes, connectors, and other components. Since the fuel engines of engineering vehicles require relatively high injection pressure and oil temperature, there are also high requirements for the direction of fuel injection. The specified fuel must pass through the designated position with more than 90% of the fuel volume.

[0003] A search revealed existing technology (publication number: CN215595765U), which describes "a diesel internal combustion engine injection pipe, including an injection pipe and a bolt joint, the bolt joint having a connecting cavity; one end of the injection pipe is fixedly connected to the bolt joint and communicates with the connecting cavity through an interface; the other end of the injection pipe has an injection nozzle; the injection nozzle has an injection port, the end face of the injection port is flat and perpendicular to the injection direction of the injection port; the injection nozzle faces the inner surface of the cylinder, and the bolt joint is connected to the gearbox through an oil pump, thereby enabling the lubricating oil in the gearbox to be sprayed onto the inner surface of the cylinder through the injection port; the in-cylinder injection pipe of the diesel internal combustion engine provided by this utility model has a flat end face without chamfering, ensuring the linearity of the injection effect, and the flow rate is confirmed by professional testing equipment, fully meeting the design requirements; the design structure of this in-cylinder injection pipe is highly practical, easy to process and implement, and has a low cost."

[0004] While existing diesel internal combustion engine fuel injection pipes have achieved practicality and low cost, they still have some shortcomings: during the operation of the fuel injector, the sealing cone surface of the needle valve body is subjected to frequent and strong impacts and abrasive wear from the needle valve, resulting in scratches or pitting on the cone surface. This increases the contact width of the mating cone surface, causing the seal to fail and resulting in fuel dripping from the fuel injector. Utility Model Content

[0005] To overcome the shortcomings of the existing technology, a diesel internal combustion engine fuel injection pipe is provided to solve the problems mentioned in the background.

[0006] To achieve the above objectives, a diesel internal combustion engine fuel injection pipe is provided, comprising: a pipe body, one end of which is connected to a connecting end, and the other end of which is connected to a fuel injector. The connecting end includes a threaded connector, one end of which has a threaded hole, and the connecting end has a flow hole inside, with a connecting groove at one end of the flow hole. One end of the pipe body is connected to the connecting groove. The fuel injector includes a valve body, and a needle valve is slidably connected inside the valve body. The needle valve has a pressure-bearing conical surface on its outer side. The needle valve includes a valve stem, and the outer wall of the valve stem has a shaped hole, with reinforcing ribs connected to the outer wall of the valve stem.

[0007] Furthermore, a sealing block is provided on the outer side of the end of the pipe body connected to the connecting end, and a locking block is connected to the outer wall of the sealing block, and the locking block is designed as a ring structure.

[0008] Furthermore, a sealing ring is provided between the card blocks, and the card blocks are engaged in the connecting groove opened on the inner side of the connecting end, and the inner wall of the connecting groove is provided with a card slot.

[0009] Furthermore, the valve body has a valve cavity inside, and a piston block is connected to the upper end of the needle valve, and the piston block is slidably connected in the valve cavity.

[0010] Furthermore, a pressure chamber is provided on the inner wall of the valve cavity, and an oil inlet passage is connected to the outer side of the pressure chamber, with the upper end of the oil inlet passage extending to the upper end of the valve body.

[0011] Furthermore, the lower end of the needle valve is connected to a sealing cone surface, and the sealing cone surface is located at the bottom of the valve cavity, and a spray hole is provided on the outside of the valve cavity.

[0012] Furthermore, the shaped holes and reinforcing ribs are evenly spaced along the length of the valve stem, and the shaped holes are symmetrically arranged in the horizontal circumferential direction of the valve stem.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. By utilizing the valve body and needle valve included in the fuel injector, as well as the valve stem section in the middle of the needle valve, the diameter of the valve stem can be reduced by the opening and reinforcing ribs on the valve stem. By reducing the weight of the valve stem, the frequent impact force and wear on the sealing cone surface caused by the needle valve falling can be reduced, thus maintaining the fit of the sealing cone surface, avoiding scratches on the cone surface that could lead to fuel leakage from the injector, and extending the service life of the fuel injector.

[0015] 2. The sealing block, sealing ring and clamping block provided at one end of the pipe body make it easy to connect the pipe body through the connecting groove opened at the connecting end. At the same time, the clamping block and sealing ring increase the stability and sealing of the connection. Then, the flow hole is used to realize the flow of oil, and the threaded hole is used to realize the connection of the oil inlet pipeline. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0017] Figure 2 This is a cross-sectional structural diagram of the connection end and the pipe body connection part in an embodiment of this utility model.

[0018] Figure 3 This is a schematic cross-sectional view of the fuel injector according to an embodiment of the present invention.

[0019] Figure 4 This is an embodiment of the present utility model. Figure 3 Schematic diagram of the structure at point A in the middle.

[0020] In the diagram: 1. Pipe body; 11. Sealing block; 12. Sealing ring; 13. Clamping block; 2. Connecting end; 21. Threaded connector; 22. Threaded hole; 23. Flow hole; 3. Injector nozzle; 31. Valve body; 32. Needle valve; 321. Valve stem; 322. Hole; 323. Reinforcing rib; 33. Piston block; 34. Oil inlet passage; 35. Valve cavity; 36. Pressure-bearing cone surface; 37. Pressure chamber; 38. Sealing cone surface; 39. Spray hole. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Reference Figures 1 to 4 As shown, this utility model provides a diesel internal combustion engine fuel injection pipe, including: a pipe body 1, one end of the pipe body 1 is connected to a connecting end 2, and the other end of the pipe body 1 is connected to a fuel injector 3. The connecting end 2 includes a threaded connector 21, one end of the threaded connector 21 is provided with a threaded hole 22, and the connecting end 2 is provided with a flow hole 23 inside, and a connecting groove is provided at one end of the flow hole 23. At the same time, one end of the pipe body 1 is connected to the connecting groove. The fuel injector 3 includes a valve body 31, and a needle valve 32 is slidably connected inside the valve body 31. The needle valve 32 is provided with a pressure-bearing cone surface 36 on its outer side. The needle valve 32 includes a valve stem 321, and a shaped hole 322 is provided on the outer wall of the valve stem 321. A reinforcing rib 323 is connected to the outer wall of the valve stem 321.

[0023] In this embodiment, the pipe body 1, the connecting end 2, and the fuel injector 3 constitute the main structure of the diesel internal combustion engine fuel injection pipe involved in this application.

[0024] Specifically, the inner wall of the threaded hole 22 is provided with internal threads, and the section with internal threads adopts a union structure, which makes it easy to connect to the oil inlet pipeline.

[0025] Specifically, the upper end of the oil inlet passage 34 opened in the valve body 31 is connected to the pipe body 1, so that diesel fuel can enter the injector 3.

[0026] Specifically, the fuel injector 3 is installed on the cylinder of the diesel engine, and one fuel injector 3 is installed on each cylinder.

[0027] like Figures 2 to 4 In the middle, a sealing block 11 is provided on the outer side of the end of the tube body 1 connected to the connecting end 2, and a locking block 13 is connected to the outer wall of the sealing block 11. The locking block 13 is designed as a ring structure, and a sealing ring 12 is provided between the locking blocks 13. The locking blocks 13 are engaged in the connecting groove opened on the inner side of the connecting end 2, and a locking groove is opened on the inner wall of the connecting groove. A valve cavity 35 is opened inside the valve body 31, and a piston block 33 is connected to the upper end of the needle valve 32. The piston block 33 is slidably connected in the valve cavity 35. A pressure chamber 37 is provided on the inner wall of valve 35, and an oil inlet passage 34 is connected to the outer side of the pressure chamber 37. The upper end of the oil inlet passage 34 extends to the upper end of the valve body 31. A sealing cone surface 38 is connected to the lower end of the needle valve 32, and the sealing cone surface 38 is located at the bottom of the valve cavity 35. A spray hole 39 is provided on the outer side of the valve cavity 35. The orifice 322 and the reinforcing rib 323 are equally spaced along the length of the valve stem 321, and the orifice 322 is symmetrically arranged in the horizontal circumferential direction of the valve stem 321.

[0028] Specifically, the card block 13 engages with each card slot, and a sealing groove is provided between adjacent card slots, and the sealing ring 12 engages in the sealing groove. At the same time, the card block 13 and the sealing ring 12 are alternately arranged.

[0029] As a preferred embodiment, by setting multiple sets of sealing rings 12 and locking blocks 13, the connection sealing performance and connection stability of the pipe body 1 are enhanced.

[0030] It should be noted that the fuel injector 3 involved in this application is an extended type, and the guide part of the needle valve 32 is far away from the combustion chamber to reduce the heat and deformation of the needle valve 32, thereby preventing the needle valve 32 from getting stuck in the needle valve body. The pressure-bearing cone surface 36 is used to bear the axial thrust generated by the oil pressure, so that the needle valve 32 rises.

[0031] Secondly, the conical surface at the lower end of the needle valve 32, called the sealing conical surface 38, mates with the sealing conical surface 38 inside the needle valve 32 body to achieve a seal within the injector cavity. Both the sealing conical surface 38 of the needle valve 32 and the sealing conical surface 38 inside the needle valve 32 body are precision machined and then paired and ground to ensure their fitting accuracy.

[0032] In use, the injector comprises a valve body and a needle valve, with a valve stem section in the middle of the needle valve. The valve stem's diameter is reduced by using a shaped hole and reinforcing ribs, thus reducing its weight. This reduces frequent impact and wear on the sealing cone surface when the needle valve is in place, maintaining the sealing cone surface's fit and preventing scratches that could cause injector leakage, thereby extending the injector's lifespan. A sealing block, sealing ring, and retaining block at one end of the tube facilitate tube connection via a connecting groove. The retaining block and sealing ring enhance connection stability and sealing. Oil flows through a flow hole, and the inlet pipe is connected via a threaded hole.

[0033] The diesel internal combustion engine fuel injection pipe of this utility model can effectively solve the problems mentioned in the background technology, and achieve the effect of strengthening the connection sealing and stability on the basis of existing diesel internal combustion engine fuel injection pipe technology, while reducing the impact and wear of the needle valve.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fuel injection pipe for a diesel internal combustion engine, comprising: The pipe body (1) is characterized in that: one end of the pipe body (1) is connected to a connecting end (2), and the other end of the pipe body (1) is connected to an oil injector (3). The connecting end (2) includes a threaded connector (21), one end of the threaded connector (21) is provided with a threaded hole (22), and the connecting end (2) is provided with a flow hole (23). A connecting groove is provided at one end of the flow hole (23), and one end of the pipe body (1) is connected to the connecting groove. The oil injector (3) includes a valve body (31), and a needle valve (32) is slidably connected inside the valve body (31). A pressure-bearing cone surface (36) is provided on the outside of the needle valve (32). The needle valve (32) includes a valve stem (321), and a shaped hole (322) is provided on the outer wall of the valve stem (321). A reinforcing rib (323) is connected to the outer wall of the valve stem (321).

2. The diesel internal combustion engine fuel injection pipe according to claim 1, characterized in that, The outer side of the end of the tube (1) connected to the connecting end (2) is provided with a sealing block (11), and the outer wall of the sealing block (11) is connected with a locking block (13), and the locking block (13) is designed as a ring structure.

3. A diesel internal combustion engine fuel injection pipe according to claim 2, characterized in that, A sealing ring (12) is provided between the card blocks (13), and the card blocks (13) are engaged in the connecting groove opened on the inner side of the connecting end (2), and the inner groove wall of the connecting groove is provided with a card slot.

4. A diesel internal combustion engine fuel injection pipe according to claim 1, characterized in that, The valve body (31) has a valve chamber (35) inside, and a piston block (33) is connected to the upper end of the needle valve (32), and the piston block (33) is slidably connected in the valve chamber (35).

5. A diesel internal combustion engine fuel injection pipe according to claim 4, characterized in that, The valve cavity (35) has a pressure chamber (37) on its inner wall, and an oil inlet channel (34) is connected to the outside of the pressure chamber (37), and the upper end of the oil inlet channel (34) extends to the upper end of the valve body (31).

6. A diesel internal combustion engine fuel injection pipe according to claim 1, characterized in that, The lower end of the needle valve (32) is connected to a sealing cone (38), and the sealing cone (38) is located at the bottom of the valve cavity (35), and a spray hole (39) is provided on the outside of the valve cavity (35).

7. A diesel internal combustion engine fuel injection pipe according to claim 1, characterized in that, The holes (322) and reinforcing ribs (323) are equally spaced along the length of the valve stem (321), and the holes (322) are symmetrically arranged in the horizontal circumferential direction of the valve stem (321).

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