Double-nut locking pressure regulating oil sprayer

Abstract

The utility model relates to the technical field of internal combustion engines, in particular to a double-nut locking pressure regulating oil injector which comprises a needle valve matching part, a nozzle tightening cap, a needle valve range limiting disc, an ejector rod, a pressure regulating spring, an oil injector body, a spring seat, a pressure regulating block and a pressure regulating nut. The pressure adjusting block, the spring seat, the pressure adjusting spring, the ejector rod, the needle valve range limiting disc and the needle valve matching part are sequentially installed in the oil sprayer body from top to bottom and are screwed and sealed through the nozzle tightening cap, the needle valve matching part comprises a needle valve body and a needle valve, a guide hole is formed in the upper end of the needle valve body, and a plurality of spraying holes are formed in the lower end of the needle valve body. The upper part of the needle valve is provided with a guide section which is correspondingly matched with the guide hole; an annular step is arranged at the upper end of the needle valve, and the diameter of the annular step is larger than that of the guide section. And an annular groove is formed in the lower end part of the guide section. The service life is prolonged, and the stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of internal combustion engines, in particular to a double-nut locking pressure regulating fuel injector. Background Art

[0002] The diesel engine fuel injection system is an important part of the diesel engine. The injector is one of the most important parts in the fuel injection system. Its performance directly affects the working condition of the diesel engine. Therefore, the injector needs to have higher reliability and service life. The existing diesel engine injectors cannot meet the development needs of diesel engines in terms of reliability and service life, and there are many areas that need further improvement.

[0003] Therefore, it is necessary to develop a new double-nut locking pressure regulating injector. Utility Model Content

[0004] The utility model aims to provide a double-nut locking pressure-regulating fuel injector to improve service life and reliability.

[0005] In order to achieve the above-mentioned purpose, the utility model discloses a double-nut locking pressure-regulating fuel injector, comprising a needle valve pair, a nozzle cap, a needle valve limiter, a push rod, a pressure-regulating spring, a fuel injector body, a spring seat, a pressure-regulating block and a pressure-regulating nut, wherein the pressure-regulating nut is mounted on the external thread in the middle of the fuel injector body, the fuel injector body is a blind hole structure, the pressure-regulating block, the spring seat, the pressure-regulating spring, the push rod, the needle valve limiter and the needle valve pair are sequentially mounted in the fuel injector body from top to bottom and are tightened and sealed with the nozzle cap, the needle valve pair comprises a needle valve body and a needle valve, the upper end of the needle valve body is provided with a guide hole, the lower end of the needle valve body is provided with a plurality of spray holes, the upper part of the needle valve is provided with a guide section corresponding to the guide hole; the upper end of the needle valve is provided with an annular step, and the diameter of the annular step is greater than the diameter of the guide section; the lower end of the guide section is provided with an annular groove.

[0006] Optionally, the top surface of the needle valve body is provided with a central hole recessed groove at a position corresponding to the guide hole. The provision of the central hole recessed groove can reduce the contact area between the needle valve body and the needle valve limiter disc, thereby reducing the tightening torque and also reducing the contact deformation of the high pressure sealing surface of the needle valve body.

[0007] Optionally, the aperture of the center hole sink is A+c millimeters, where 1mm≤c≤3mm, and A is the diameter of the guide section; this can better reduce the contact area and thus better reduce contact deformation.

[0008] Optionally, the diameter of the guide section of the needle valve is A mm, and the diameter of the annular step is A+b mm, wherein 0.2 mm≤b≤0.5 mm; this can better reduce the impact of the needle valve on the sealing surface of the needle valve body when the needle valve moves downward, thereby increasing the service life of the parts.

[0009] Optionally, the outer diameter of the annular groove is Ad millimeters, wherein 2mm≤d≤4mm, and A is the diameter of the guide section; this can more effectively reduce the sticking of the needle valve pair caused by high-pressure deformation.

[0010] Optionally, the lower end of the needle valve body is provided with an upper row of spray holes and a lower row of spray holes, and the number and diameter of the upper row of spray holes and the lower row of spray holes are inconsistent; the axial section angles of the upper row of spray holes and the lower row of spray holes are inconsistent; the circumferential angles of the upper row of spray holes and the lower row of spray holes are evenly distributed. This can spray oil more fully, avoid oil beam interference from the spray holes, and distribute it more evenly in the cylinder, which is conducive to combustion.

[0011] Beneficial effects of the utility model:

[0012] The double nut locking pressure regulating injector described in the utility model increases the tail diameter of the needle valve by setting an annular step, which can reduce the impact of the needle valve on the sealing surface of the needle valve limiter, thereby improving the service life of the parts. By setting a center hole sink groove on the top surface of the needle valve body, the contact area between the needle valve body and the needle valve limiter can be reduced, the tightening torque is reduced, and the contact deformation between the high-pressure sealing surface of the needle valve body and the needle valve limiter is reduced, thereby improving the service life of the parts. In addition, adding an annular groove to the guide section of the needle valve can reduce the influence of the deformation of the pressure storage chamber under high pressure on the guide sliding of the needle valve pair, thereby improving the reliability of the injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0014] Figure 2 This is one of the specific structural schematic diagrams of the needle valve assembly in the embodiment of the present application;

[0015] Figure 3 This is the second schematic diagram of the specific structure of the needle valve assembly in the embodiment of the present application;

[0016] Figure 4 for Figure 2 A top view of

[0017] Figure 5 for Figure 2 Bottom view of

[0018] Figure 6 Schematic diagram of the specific structure of the needle valve in the embodiment of the present application;

[0019] In the figure: 1. needle valve pair, 2. nozzle cap, 3. needle valve limit plate, 4. push rod, 5. pressure regulating spring, 6. injector body, 7. spring seat, 8. pressure regulating block, 9. pressure regulating nut, 10. needle valve body, 11. needle valve, 12. arc-shaped oil storage tank, 13. high-pressure oil channel, 14. middle hole sink, 15. pressure storage chamber, 16. upper row of spray holes, 17. lower row of spray holes, 18. annular step, 19. annular groove, 20. guide section, 21. sealing surface. DETAILED DESCRIPTION

[0020] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not intended to limit the scope of protection of the present application.

[0021] like Figure 1 As shown, in the embodiment of the present application, a double-nut locking pressure-regulating injector comprises a needle valve pair 1, a nozzle cap 2, a needle valve limiter 3, a push rod 4, a pressure-regulating spring 5, an injector body 6, a spring seat 7, a pressure-regulating block 8 and a pressure-regulating nut 9. The pressure-regulating nut 9 is mounted on the external thread in the middle of the injector body 6. The injector body 6 is a blind hole structure. The pressure-regulating block 8, the spring seat 7, the pressure-regulating spring 5, the push rod 4, the needle valve limiter 3 and the needle valve pair 1 are sequentially mounted in the injector body 6 from top to bottom, and finally the nozzle cap 2 is used to tighten and seal. A threaded hole is provided on the upper part of the injector body 6 for easy installation and disassembly.

[0022] like Figures 2 to 5 As shown, in a possible implementation, the needle valve pair 1 includes a needle valve body 10 and a needle valve 11. The upper end face inlet of the needle valve body 10 is an arc-shaped oil storage groove 12, and two high-pressure oil holes 13 enter the pressure storage chamber 15. The middle part of the needle valve body 10 is a hollow structure. The lower end of the needle valve body 10 is provided with a plurality of spray holes, namely, an upper row of spray holes 16 and a lower row of spray holes 17. The number and diameter of the upper row of spray holes 16 and the lower row of spray holes 17 are inconsistent. The diameter of the upper row of spray holes 16 is large, and the diameter of the lower row of spray holes 17 is small. The axial section angles of the upper row of spray holes 16 and the lower row of spray holes 17 are inconsistent. The circumferential angles of the upper row of spray holes 16 and the lower row of spray holes 17 are evenly distributed. The upper row of spray holes 16 and the lower row of spray holes 17 can make the oil mist more evenly distributed in the cylinder.

[0023] like Figure 6As shown, in a possible implementation, a guide section 20 corresponding to the guide hole is provided on the upper part of the needle valve 11. An annular step 18 is provided at the upper end of the needle valve 11, and the diameter of the annular step 18 is larger than the diameter of the guide section 20; an annular groove 19 is provided at the lower end of the guide section 20. A center hole sink 14 is provided on the top surface of the needle valve body 10 at a position corresponding to the guide hole.

[0024] In the embodiment of the present application, the double-nut locking pressure regulating injector can increase the tail diameter of the needle valve 11 by setting an annular step 18, thereby reducing the impact of the needle valve 11 on the sealing surface of the needle valve limiter, thereby improving the service life of the parts. By setting a center hole sink groove 14 on the top surface of the needle valve body 10, the contact area between the needle valve limiter 3 and the needle valve body 10 can be reduced, the tightening torque is reduced, and the contact deformation between the high-pressure sealing surface of the needle valve body 10 and the needle valve limiter 3 is reduced. In addition, adding an annular groove 19 to the guide section 20 of the needle valve 11 can reduce the influence of the deformation of the pressure storage chamber 15 under high pressure on the guiding sliding of the needle valve pair, thereby improving the reliability of the double-nut locking pressure regulating injector.

[0025] In a possible implementation, the diameter of the annular step 18 is A+b millimeters, wherein 1 mm≤b≤3 mm.

[0026] In a possible implementation, the diameter of the middle hole sink 14 is A+c mm, where 0.2 mm≤c≤0.5 mm, and A is the diameter of the guide section 20 .

[0027] In a possible implementation, the outer diameter of the annular groove 19 is Ad mm, wherein 2 mm≤d≤4 mm.

[0028] The specific implementation process of the double-nut locking pressure regulating injector described in the embodiment of the present application is as follows:

[0029] During operation, the high-pressure fuel flows through the high-pressure fuel channel connected to the injector body 6 through the high-pressure fuel pipe, flows into the arc-shaped oil storage groove 12 on the upper end surface of the needle valve body 10 through the high-pressure oil channel of the needle valve limiter 3, and flows into the pressure storage chamber 15 through the high-pressure oil channel 13. The compression degree of the pressure regulating spring 5 is controlled by adjusting the pressure regulating nut 9, and then the preload force of the pressure regulating spring 5 is controlled to ensure the pressure for opening the needle valve 11. Finally, the high-pressure fuel is sprayed into the cylinder through the upper row of spray holes 16 and the lower row of spray holes 17 for combustion.

[0030] Therefore, the implementation methods of the present invention are not limited to the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A double-nut locking pressure regulating fuel injector, comprising a needle valve pair (1), a nozzle cap (2), a needle valve limiter (3), a push rod (4), a pressure regulating spring (5), a fuel injector body (6), a spring seat (7), a pressure regulating block (8) and a pressure regulating nut (9), wherein the pressure regulating nut (9) is mounted on the middle external thread of the fuel injector body (6), the fuel injector body (6) is a blind hole structure, the pressure regulating block (8), the spring seat (7), the pressure regulating spring (5), the push rod (4), the needle valve limiter (3), and the needle valve pair (1) are sequentially installed in the injector body (6) from top to bottom and are screwed and sealed with a nozzle cap (2). The needle valve pair (1) comprises a needle valve body (10) and a needle valve (11). The upper end of the needle valve body (10) is provided with a guide hole, and the lower end of the needle valve body (10) is provided with a plurality of spray holes. The upper part of the needle valve (11) is provided with a guide section (20) corresponding to the guide hole. The characteristics are as follows: An annular step (18) is provided at the upper end of the needle valve (11), and the diameter of the annular step (18) is greater than the diameter of the guide section (20); an annular groove (19) is provided at the lower end of the guide section (20).

2. The double-nut locking pressure regulating injector according to claim 1, characterized in that: The top surface of the needle valve body (10) is provided with a center hole recess (14) at a position corresponding to the guide hole.

3. The double-nut locking pressure regulating fuel injector according to claim 2, characterized in that: The hole diameter of the middle hole sink (14) is A+c millimeters, wherein 1mm≤c≤3mm, and wherein A is the diameter of the guide section (20).

4. The double-nut locking pressure regulating injector according to claim 1, characterized in that: The diameter of the guide section (20) is A mm, and the diameter of the annular step (18) is A+b mm, wherein 0.2 mm≤b≤0.5 mm.

5. The double-nut locking pressure regulating injector according to claim 1, characterized in that: The outer diameter of the annular groove (19) is Ad millimeters, wherein 2 mm ≤ d ≤ 4 mm, and A is the diameter of the guide section (20).

6. The double-nut locking pressure regulating injector according to claim 1, characterized in that: An upper row of spray holes (16) and a lower row of spray holes (17) are provided at the lower end of the needle valve body (10), and the number and diameter of the upper row of spray holes (16) and the lower row of spray holes (17) are inconsistent.

7. The double-nut locking pressure regulating injector according to claim 6, characterized in that: The axial section angles of the upper row of spray holes (16) and the lower row of spray holes (17) are inconsistent.

8. The double-nut locking pressure regulating fuel injector according to claim 6, characterized in that: The circumferential angles of the upper row of spray holes (16) and the lower row of spray holes (17) are evenly distributed.

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