High-flow oil sprayer

Abstract

The utility model provides a large-flow oil injector which comprises an oil injector body, oil injection nozzles, an electromagnetic valve set and a piston rod, the oil injection nozzles are arranged at the upper end and the lower end of the oil injector body respectively, the piston rod is connected with the electromagnetic valve set and the oil injection nozzles, and an oil outlet channel is formed in the electromagnetic valve set. A control panel is arranged between the electromagnetic valve set and the oil sprayer body, an oil outlet throttling hole communicated with the oil outlet channel is formed in the top of the control panel, an oil control cavity is formed between the oil outlet throttling hole and the top face of the piston rod, and the central axis of the oil outlet throttling hole, the central axis of the oil control cavity and the central axis of the piston rod coincide. An oil return channel is further arranged in the oil injector body, communicates with the oil outlet channel and is used for recycling fuel oil leaked in the oil injector. The oil nozzle comprises an oil nozzle body, at least ten spraying holes are formed in an oil spraying cavity of the oil nozzle body, and the inner diameter of each spraying hole ranges from 0.245 mm to 0.265 mm. The high-flow fuel injector can improve the fuel injection efficiency and flow, and is good in working stability.

Description

Technical Field

[0001] This utility model relates to the field of fuel injector technology, and in particular to a high-flow fuel injector. Background Technology

[0002] Fuel injectors are crucial components of an engine's fuel system, and their performance directly impacts fuel injection efficiency and engine performance. Driven by environmental regulations, increasing market demand, and the development of electronic control units (ECUs), the power output of internal combustion engines in fuel systems is constantly increasing.

[0003] High-flow fuel injectors are key components of engines (internal combustion engines), widely used in heavy vehicles, ships, generator sets, etc. They need to deliver large amounts of fuel in a short time to meet fuel demands under high-load conditions and ensure stable engine operation at high power output. However, most existing fuel injectors cannot meet the fuel requirements of high-power engines (internal combustion engines) and lack stability. Utility Model Content

[0004] The present invention aims to provide a high-flow-rate fuel injector to overcome the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a high-flow fuel injector, including an injector body, a fuel nozzle, a solenoid valve assembly, and a piston rod. The solenoid valve assembly and the fuel nozzle are respectively disposed at the upper and lower ends of the injector body. The piston rod is disposed inside the injector body and connected to the solenoid valve assembly and the fuel nozzle. The solenoid valve assembly has an oil outlet channel, and the injector body has an oil inlet channel. A control plate is disposed between the solenoid valve assembly and the injector body. The top of the control plate has an oil outlet throttling orifice communicating with the oil outlet channel. An oil control chamber is disposed between the oil outlet throttling orifice and the top surface of the piston rod. The central axes of the oil outlet throttling orifice, the oil control chamber, and the piston rod coincide. The injector body also has a return oil channel, which communicates with the oil outlet channel for recovering fuel leaked inside the injector. The fuel nozzle includes a nozzle, and the nozzle's injection chamber has at least 10 spray holes, which are evenly distributed circumferentially with an inner diameter of 0.245-0.265 mm.

[0006] Furthermore, in the aforementioned high-flow injector, the number of nozzles is 10-12.

[0007] Furthermore, in the aforementioned high-flow injector, the oil inlet channel is connected to the oil control chamber through oil inlet branch one and oil inlet branch two. Oil inlet branch one is located inside the injector body, and oil inlet branch two is located inside the oil control plate. An oil inlet throttling hole is provided between oil inlet branch one and oil inlet branch two.

[0008] Furthermore, in the aforementioned high-flow injector, the oil control chamber includes an upper oil control chamber located within the oil control plate and a lower oil control chamber located within the injector body. The upper oil control chamber includes multiple conical cavities, which gradually decrease in size from bottom to top.

[0009] Furthermore, in the aforementioned high-flow injector, the maximum inner diameter of the lower end of the upper control chamber is smaller than the outer diameter of the upper end of the piston rod, which can limit the upward stroke of the piston rod.

[0010] Furthermore, in the aforementioned high-flow injector, the injector nozzle also includes an injector needle, a limiting seat, and an injector spring. The injector nozzle is connected to the lower end of the injector body via an injector nut. The injector needle is inserted into the injector nozzle and slidably connected to it. The limiting seat is located between the injector nozzle and the injector body. The injector spring is sleeved on the lower end of the piston rod, with an upper spring seat at its upper end and a lower spring seat at its lower end. The upper spring seat is fixedly connected to the injector body, and the lower spring seat is located inside the limiting seat and slidably connected to it. The bottom of the lower spring seat elastically abuts against the top surface of the injector needle.

[0011] Furthermore, in the aforementioned high-flow injector, the nozzle has an axial cavity inside, the needle is inserted into the axial cavity, the lower end of the axial cavity is the injection chamber, and the inner wall of the injection chamber is coated with a diamond layer.

[0012] Furthermore, in the aforementioned high-flow injector, the injector body has a guide cavity inside, which is a stepped hole that is smaller at the top and larger at the bottom, with a sliding hole at the upper end. The piston rod is inserted into the guide cavity, and the upper end of the piston rod is in transition fit with the sliding hole.

[0013] Furthermore, in the aforementioned high-flow-rate injector, the outer side of the section where the piston rod transitions into the sliding hole is provided with multiple oil storage grooves.

[0014] Furthermore, in the aforementioned high-flow injector, the return oil channel is also connected to the return oil groove, which is located on the top surface of the limiting seat and is connected to the drain gap. The drain gap includes the gap between the limiting seat and the injector body, and between the oil needle and the nozzle.

[0015] Compared with the prior art, the beneficial effects of this utility model are: the high-flow fuel injector of this utility model can improve the efficiency and flow of fuel injection, and the piston rod and needle have good working stability. It has superior performance such as high injection rate, high pressure injection, precision control and high durability, which meets the needs of high-power engines for high-flow injection. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the high-flow fuel injector of this utility model;

[0018] Figure 2 for Figure 1 A partial enlarged structural diagram of A;

[0019] Figure 3 for Figure 1 A magnified schematic diagram of the B-section structure;

[0020] In the diagram: 1. Injector body; 2. Solenoid valve assembly; 3. Piston rod; 4. Oil outlet channel; 5. Control board; 6. Oil outlet throttle orifice; 7. Oil control chamber; 8. Upper oil control chamber; 9. Oil return channel; 10. Nozzle; 11. Injection chamber; 12. Spray nozzle; 13. Oil inlet channel; 14. Oil inlet branch one; 15. Oil inlet branch two; 16. Oil inlet throttle orifice; 17. Needle needle; 18. Limit seat; 19. Nozzle spring; 20. Upper spring seat; 21. Lower spring seat; 22. Guide cavity; 23. Sliding hole; 24. Oil reservoir groove; 25. Oil return groove; 26. Oil reservoir elongated chamber; 27. Oil reservoir. 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] Example 1

[0023] like Figure 1-3As shown, a high-flow fuel injector includes an injector body 1, a fuel nozzle, a solenoid valve assembly 2, and a piston rod 3. The solenoid valve assembly 2 and the fuel nozzle are respectively located at the upper and lower ends of the injector body 1. The piston rod 3 is located inside the injector body 1 and connected to the solenoid valve assembly 2 and the fuel nozzle. The solenoid valve assembly 2 has an oil outlet channel 4, and the injector body 1 has an oil inlet channel 13. A control plate 5 is provided between the solenoid valve assembly 2 and the injector body 1. The top of the control plate 5 has an oil outlet throttling orifice 6 communicating with the oil outlet channel 4. The oil outlet throttling orifice 6 is connected to the top surface of the piston rod 3. An oil control chamber 7 is provided between the oil outlet throttling orifice 6, the oil control chamber 7, and the piston rod 3. The central axes of these components coincide. This invention is controlled by an ECU. The solenoid valve adopts a curved surface seal (spherical) sealing valve, which improves valve opening and closing. The lower part of the sealing valve of the solenoid valve is directly connected to the oil outlet throttling orifice 6. Pressure changes are directly reflected on the piston rod 3, resulting in faster response and higher precision. Furthermore, since the central axes of the throttling orifice 6, the oil control chamber 7, and the piston rod 3 coincide, the pressure change of the piston rod 3 is only in the vertical direction, resulting in good stability of the piston rod 3. This, in turn, improves the stability of controlling the opening and closing of the oil needle 17.

[0024] like Figure 1 , 2 As shown, the injector body 1 is also provided with a return oil channel 9, which is connected to the oil outlet channel 4. It is used to recover the fuel leaked inside the injector, which can reduce leakage and ensure the stability of the internal pressure of the injector.

[0025] Among them, such as Figure 1 , 3 As shown, the fuel injector includes a nozzle 10, a needle 17, a limiting seat 18, and a nozzle spring 19. The nozzle 10 is connected to the lower end of the injector body 1 via a nozzle nut. The needle 17 is inserted into the nozzle 10 and slidably connected to it. The limiting seat 18 is located between the nozzle 10 and the injector body 1. The nozzle spring 19 is sleeved on the lower end of the piston rod 3, with an upper spring seat 20 at its upper end and a lower spring seat 21 at its lower end. The upper spring seat 20 is fixedly connected to the injector body 1, and the lower spring seat 21 is located inside the limiting seat 18 and slidably connected to it. The bottom of the lower spring seat 21 elastically abuts against the top surface of the needle 17. Compared to the rigid connection between the lower spring seat 21 and the needle 17, this reduces the impact of pressure changes on the needle 17 and improves its service life.

[0026] like Figure 1 , 3As shown, the nozzle 10 has an axial cavity inside, and the needle 17 is inserted into the axial cavity. The lower end of the axial cavity is the injection chamber 11, which has 10 injection holes 12. The multiple injection holes 12 are evenly distributed around the circumference and have an inner diameter of 0.255mm to ensure uniform fuel injection distribution and improve atomization effect. The flow rate of the injector of this utility model reaches 3900-4200cm3 / min, which meets the fuel injection requirements of high-power engines.

[0027] In addition, such as Figure 1 , 3 As shown, the axial cavity also includes an oil storage elongated cavity 26 and an oil storage tank 27 disposed above the injection chamber 12. The oil storage tank 27 is connected to the oil inlet channel 13 to meet the large flow rate oil storage requirements. The gap between the oil storage elongated cavity 26 and the oil needle 17 is small, and the length of the oil storage elongated cavity 26 is greater than 40 times this gap, which facilitates the smooth, stable and rapid flow of high-pressure fuel into the injection chamber 13.

[0028] In the above structure, the inner wall of the fuel injection chamber 11 is provided with a diamond coating. The diamond coating has high hardness, low coefficient of friction, excellent wear resistance and chemical stability, which can improve the fuel nozzle's resistance to erosion and corrosion and reduce the erosion and corrosion of the fuel nozzle caused by high flow rates.

[0029] Example 2

[0030] like Figure 1-3 As shown, a high-flow fuel injector includes an injector body 1, a fuel nozzle, a solenoid valve assembly 2, and a piston rod 3. The solenoid valve assembly 2 and the fuel nozzle are respectively located at the upper and lower ends of the injector body 1. The piston rod 3 is located inside the injector body 1 and connected to the solenoid valve assembly 2 and the fuel nozzle. The solenoid valve assembly 2 has an oil outlet channel 4, and the injector body 1 has an oil inlet channel 13. A control plate 5 is provided between the solenoid valve assembly 2 and the injector body 1. The top of the control plate 5 has an oil outlet throttling orifice 6 communicating with the oil outlet channel 4. The oil outlet throttling orifice 6 is connected to the top surface of the piston rod 3. An oil control chamber 7 is provided between the oil outlet throttling orifice 6, the oil control chamber 7, and the piston rod 3. The central axes of these components coincide. This invention is controlled by an ECU. The solenoid valve adopts a curved surface seal (spherical) sealing valve, which improves valve opening and closing. The lower part of the sealing valve of the solenoid valve is directly connected to the oil outlet throttling orifice 6. Pressure changes are directly reflected on the piston rod 3, resulting in faster response and higher precision. Furthermore, since the central axes of the throttling orifice 6, the oil control chamber 7, and the piston rod 3 coincide, the pressure change of the piston rod 3 is only in the vertical direction, resulting in good stability of the piston rod 3. This, in turn, improves the stability of controlling the opening and closing of the oil needle 17.

[0031] like Figure 1 , 2As shown, the injector body 1 is also provided with a return oil channel 9, which is connected to the oil outlet channel 4. It is used to recover the fuel leaked inside the injector, which can reduce leakage and ensure the stability of the internal pressure of the injector.

[0032] Among them, such as Figure 1 , 3 As shown, the fuel injector includes a nozzle 10, a needle 17, a limiting seat 18, and a nozzle spring 19. The nozzle 10 is connected to the lower end of the injector body 1 via a nozzle nut. The needle 17 is inserted into the nozzle 10 and slidably connected to it. The limiting seat 18 is located between the nozzle 10 and the injector body 1. The nozzle spring 19 is sleeved on the lower end of the piston rod 3, with an upper spring seat 20 at its upper end and a lower spring seat 21 at its lower end. The upper spring seat 20 is fixedly connected to the injector body 1, and the lower spring seat 21 is located inside the limiting seat 18 and slidably connected to it. The bottom of the lower spring seat 21 elastically abuts against the top surface of the needle 17. Compared to the rigid connection between the lower spring seat 21 and the needle 17, this reduces the impact of pressure changes on the needle 17 and improves its service life.

[0033] like Figure 1 , 3 As shown, the nozzle 10 has an axial cavity inside, and the needle 17 is inserted into the axial cavity. The lower end of the axial cavity is the injection chamber 11, which has 12 injection holes 12. The injection holes 12 are evenly distributed around the circumference and have an inner diameter of 0.245 mm to ensure uniform fuel injection distribution and improve atomization. The flow rate of this injector reaches 3900-4200 cm3 / min, which meets the fuel injection requirements of high-power engines.

[0034] In addition, such as Figure 1 , 3 As shown, the axial cavity also includes an oil storage elongated cavity 26 and an oil storage tank 27 disposed above the injection chamber 12. The oil storage tank 27 is connected to the oil inlet channel 13 to meet the large flow rate oil storage requirements. The gap between the oil storage elongated cavity 26 and the oil needle 17 is small, and the length of the oil storage elongated cavity 26 is greater than 40 times this gap, which facilitates the smooth, stable and rapid flow of high-pressure fuel into the injection chamber 13.

[0035] In the above structure, the inner wall of the fuel injection chamber 11 is provided with a diamond coating. The diamond coating has high hardness, low coefficient of friction, excellent wear resistance and chemical stability, which can improve the fuel nozzle's resistance to erosion and corrosion and reduce the erosion and corrosion of the fuel nozzle caused by high flow rates.

[0036] Example 3

[0037] Based on the structure of Embodiment 1 or 2, such as Figure 1 , 2As shown, the oil inlet channel 13 is connected to the oil control chamber 7 via oil inlet branch 14 and oil inlet branch 2 15. Oil inlet branch 14 is located inside the injector body 1, and oil inlet branch 2 15 is located inside the oil control plate 5. An oil inlet throttling orifice 16 is provided between oil inlet branch 14 and oil inlet branch 2 15. By keeping the oil inlet throttling orifice 16 away from the oil control chamber 7, the impact of sudden pressure changes at the oil inlet throttling orifice 16 on the oil control chamber 7 is reduced, thus stabilizing the pressure changes within the oil control chamber 7.

[0038] like Figure 2 As shown, the oil control chamber 7 includes an upper oil control chamber 8 located within the oil control plate 5 and a lower oil control chamber located within the injector body 1. The upper oil control chamber 8 comprises multiple conical cavities, which gradually decrease in size from bottom to top, i.e., gradually decrease in size along the oil outlet direction. Furthermore, the maximum inner diameter of the lower end of the upper oil control chamber 8 is smaller than the outer diameter of the upper end of the piston rod 3, thus limiting the upward stroke of the piston rod 3.

[0039] like Figure 1 , 2 As shown, the injector body 1 has a guide cavity 22 inside. The guide cavity 22 is a stepped hole that is smaller at the top and larger at the bottom, with a sliding hole 23 at its upper end. The piston rod 3 is inserted into the guide cavity 22, and the upper end of the piston rod 3 transitions into the sliding hole 23. In addition, multiple oil storage grooves 24 are provided on the outer side of the section where the piston rod 3 transitions into the sliding hole 23, which have a lubricating effect, reduce friction, and provide good sliding performance, thereby ensuring stable operation of the piston rod 3.

[0040] Among them, such as Figure 1 , 3 As shown, the return oil channel 9 is also connected to the return oil groove 25, which is located on the top surface of the limiting seat 18 and communicates with the drain gap. The drain gap includes the gap between the limiting seat 18 and the injector body 1, and between the needle 17 and the nozzle 10. The return oil channel 9 can collect fuel leaking from the tiny gaps between the injector parts, reduce leakage, and ensure the stability of the internal pressure of the injector.

[0041] This utility model's high-flow-rate fuel injector can improve fuel injection efficiency and flow rate, and the piston rod and needle have good working stability. It has superior performance such as high injection rate, high-pressure injection, precise control, and high durability, meeting the high-flow-rate injection requirements of high-power engines.

[0042] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0043] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A large flow rate fuel injector, comprising a fuel injector body, a fuel nozzle, a solenoid valve group, a piston rod, the solenoid valve group and the fuel nozzle being arranged at the upper and lower ends of the fuel injector body respectively, and the piston rod being arranged in the fuel injector body and connected with the solenoid valve group and the fuel nozzle, characterized in that: the piston rod is arranged in the fuel injector body and connected with the solenoid valve group and the fuel nozzle, and the piston rod is arranged in the fuel injector body and connected with the solenoid valve group and the fuel nozzle. The electromagnetic valve group is provided with an oil outlet channel, the fuel injector body is provided with an oil inlet channel, the control panel is arranged between the electromagnetic valve group and the fuel injector body, the top of the control panel is provided with an oil outlet throttle hole communicated with the oil outlet channel, the oil outlet throttle hole and the top surface of the piston rod are provided with an oil control cavity, the oil outlet throttle hole, the oil control cavity and the central axis of the piston rod are coincided; the fuel injector body is further provided with an oil return channel communicated with the oil outlet channel, which is used for recycling the leaked fuel in the fuel injector; the fuel nozzle comprises a nozzle, at least 10 nozzle holes are arranged in the fuel injection cavity of the nozzle, and the nozzle holes are uniformly distributed in the circumference, and the inner diameter is 0.245-0.265 mm.

2. The high-flow fuel injector of claim 1, wherein: The number of the nozzle holes is 10-12.

3. The high-flow fuel injector of claim 1, wherein: The oil inlet channel is communicated with the oil control cavity through the first oil inlet branch and the second oil inlet branch, the first oil inlet branch is arranged in the fuel injector body, the second oil inlet branch is arranged in the oil control panel, and the oil inlet throttle hole is arranged between the first oil inlet branch and the second oil inlet branch.

4. The high-flow rate fuel injector of claim 1 or 3, wherein: The oil control cavity comprises an upper oil control cavity arranged in the oil control panel and a lower oil control cavity arranged in the fuel injector body, the upper oil control cavity comprises a plurality of tapered cavities, and the cavities gradually decrease in size along the direction from bottom to top.

5. The high-flow fuel injector of claim 4, wherein: The maximum inner diameter of the lower end of the upper oil control cavity is smaller than the outer diameter of the upper end of the piston rod, so that the upward stroke of the piston rod can be limited.

6. The high-flow fuel injector of claim 1, wherein: The fuel nozzle further comprises a needle, a limiting seat and a nozzle spring, the nozzle is connected with the lower end of the fuel injector body through a nozzle nut, the needle is inserted into the nozzle and is in sliding connection with the nozzle, the limiting seat is arranged between the nozzle and the fuel injector body, the nozzle spring is sleeved on the lower end of the piston rod, the upper end of the nozzle spring is provided with an upper spring seat, the lower end of the nozzle spring is provided with a lower spring seat, the upper spring seat is fixedly connected with the fuel injector body, the lower spring seat is arranged in the limiting seat and is in sliding connection with the limiting seat, and the bottom of the lower spring seat is in elastic abutment with the top surface of the needle.

7. The high-flow fuel injector of claim 6, wherein: The inside of the nozzle is provided with an axial cavity, the needle is inserted into the axial cavity, the lower end of the axial cavity is a fuel injection cavity, and the inner side wall of the fuel injection cavity is provided with a diamond coating.

8. The high-flow fuel injector of claim 1, wherein: The inside of the fuel injector body is provided with a guide cavity, the guide cavity is a stepped hole with a small upper end and a large lower end, the upper end of the guide cavity is a sliding hole, the piston rod is inserted into the guide cavity, and the upper end of the piston rod is in transition fit with the sliding hole.

9. The high-flow fuel injector of claim 8, wherein: A plurality of oil storage grooves are arranged on the outer side of the transition fit part of the piston rod and the sliding hole.

10. The high-flow fuel injector of claim 6, wherein: The oil return channel is further communicated with an oil return groove, the oil return groove is arranged on the top surface of the limiting seat and is communicated with a fuel leakage gap, and the fuel leakage gap comprises the gaps between the limiting seat and the fuel injector body and between the needle and the nozzle.

Images