A high-pressure common rail quick-response injector with axial misalignment control

Abstract

A high-pressure common rail rapid-response fuel injector with axial offset control includes an end face throttling channel, a side face throttling channel, a first end face oblique channel, a valve shoulder side face channel, a second end face oblique channel, a valve core guide hole, a valve core upper end face, and a valve core oil storage chamber. The end face throttling channel, valve core guide hole, and valve core oil storage chamber are coaxially arranged. The valve core oil storage chamber is arranged between the valve core guide hole and the end face throttling channel. The side face throttling channel communicates with the valve core oil storage chamber. The first end face oblique channel communicates with the valve shoulder side channel, and the valve shoulder side channel communicates with the low-pressure oil circuit. The end face throttling channel communicates with the integrated cavity of the control valve seat. The first end face oblique channel communicates with the end face groove of the control valve core. Together with the actuator and control valve, it forms a unique control oil circuit that can quickly open and close the injector assembly. Direct control of the injector by the throttle valve improves response speed and reduces duration.

Description

Technical Field

[0001] The invention relates to a fast-response common rail fuel injector for a diesel engine, in particular to a high-pressure common rail fast-response fuel injector with axial misalignment control. Background Art

[0002] During the operation of a diesel engine's common rail injector assembly, a certain delay occurs from the time the injector receives the injection start pulse signal until the injection is completed. This delay is called the opening delay time. Similarly, a certain delay occurs from the time the injector receives the injection shutoff pulse signal until the injection is shut off. This delay is called the closing delay time. Shorter opening and closing delays indicate a faster injector response. Faster injector response improves injector operating stability, increases the injector assembly's adaptable engine speed, and improves engine power density. To control the duration of the injector assembly's injection, a common control valve solution currently uses a servo mechanism with an inlet and outlet oil metering port. The flow rate difference between the inlet and outlet ports is used to control the rail pressure within the servo mechanism, thereby controlling the response time.

[0003] In order to reduce the duration, it is necessary to reduce the opening or closing delay of the injector assembly during injection. Existing diesel engine injectors cannot control the opening and closing delays of the injector at the same time. In other words, the current control valve solution, in order to reduce the duration, if the parameters are matched by the flow difference between the inlet and outlet oil holes, there will be a hyperbolic effect on the effect of the opening delay and closing delay, and the ultimate actual effect is very limited.

[0004] In order to overcome the defects in the prior art, the applicant has invented a high pressure

[0005] Common rail quick response injector reduces the response time during the operation of the injector assembly and improves the response speed.

[0006] Among them, the hydraulic throttle valve is one of the core parts. Summary of the Invention

[0007] The object of the present invention is to provide a high-pressure common rail quick-response fuel injector with axial misalignment control.

[0008] The technical solution adopted by the present invention is:

[0009] A hydraulic throttle valve in a high-pressure common rail fast-response injector with axial misalignment control comprises an end face throttling channel, a side face throttling channel, a first end face oblique channel, a valve shoulder side face channel, a second end face oblique channel, a valve core guide hole, an upper end face of the valve core and a valve core oil storage chamber. The end face throttling channel, the valve core guide hole and the valve core oil storage chamber are coaxially arranged. The valve core oil storage chamber is arranged between the valve core guide hole and the end face throttling channel. The side face throttling channel is communicated with the valve core oil storage chamber. The first end face oblique channel is communicated with the valve shoulder side face channel. The valve shoulder side face channel is communicated with a low-pressure oil circuit. The end face throttling channel is communicated with a comprehensive volume of a control valve seat. The first end face oblique channel is communicated with an end face groove of the control valve core.

[0010] The hydraulic throttle valve is arranged between the control valve seat and the needle valve body, that is, the upper end is connected to the lower end surface of the valve seat of the control valve seat, and the lower end is connected to the needle valve body, ensuring that the first inclined channel of the end surface is connected to the end surface groove, and the second inclined channel of the end surface is connected to the valve seat oil inlet channel.

[0011] The beneficial effects achieved by the present invention are:

[0012] The high-pressure common rail injector adopts this hydraulic throttle valve, which, in combination with the hydraulic control valve and the injector nozzle pair, can eliminate the hydraulic servo structure of the conventional injector. The nozzle is directly controlled by the present invention, which improves the response speed, reduces the duration, and increases the injection density. When the actuator loses power, the throttle valve core is sealed on the end face of the throttle valve, so the force exerted by the high-pressure liquid on the throttle valve core is relatively small, so the electromagnetic force required during operation can be relatively small, which can not only reduce the volume of components such as the actuator and the throttle valve core, but also be beneficial to the layout of the injector assembly; it can also reduce the heat generated by the actuator part during operation, which can improve the reliability of the injector assembly. The structural design of the throttle valve core and the throttle valve plane seal can flexibly change the area of ​​the sealing ring during the performance development of the injector assembly to achieve flexible control of the injection regular waveform and expand the application range of the injector assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of a hydraulic throttle valve;

[0014] Figure 2 Schematic diagram of the structure of the high-pressure common rail injector of the present invention;

[0015] Figure 3 It is the structural diagram of the actuator;

[0016] Figure 4 It is a structural diagram of the control valve core;

[0017] Figure 5 It is a structural diagram of the control valve seat;

[0018] Figure 6 Schematic diagram of the structure of the needle valve body;

[0019] Figure 7 Schematic diagram of the structure of the needle valve;

[0020] Figure 8 for Figure 7 A magnified cross-sectional view of the structure at AA in the middle (oil inlet groove structure);

[0021] In the figure: 1-end face throttling channel; 2-side throttling channel; 3-end face first oblique channel; 4-valve shoulder side channel; 5-end face second oblique channel; 6-first valve core guide hole; 7-valve core upper end face; 8-valve core oil storage chamber;

[0022] 10-injector body; 20-actuator; 30-control valve core; 40-control valve seat; 60-needle valve body; 70-needle valve; 80-actuator spring; 90-fastening cap; 11-nozzle spring seat; 12-main oil channel; 13-high-pressure oil channel;

[0023] 14-actuator spring seat; 15-oil nozzle spring; 21-spring channel; 22-actuator oil inlet channel;

[0024] 300-armature plate; 301-guide column; 302-middle sealing section; 303-concave space; 304-oil storage groove;

[0025] 305 - end face groove; 306 - guide rod lower end face; 307 - oil storage groove conical surface; 308 - axial limit column; 309 - spring limit section; 401 - second valve core guide hole; 402 - integrated cavity; 403 - oil inlet conical surface; 404 - oil ring groove;

[0026] 405 - valve seat oil inlet channel; 406 - inclined oil channel; 407 - valve seat upper end surface; 408 - valve seat lower end surface;

[0027] 409 - valve core chamber; 601 - upper oil storage chamber; 602 - valve needle guide hole; 603 - middle oil storage chamber; 604 - lower oil storage chamber;

[0028] 701-upper guide rod; 702-oil inlet guide section; 703-lower rod body; 704-axial oil inlet structure; 705-axial limit surface. DETAILED DESCRIPTION

[0029] The specific embodiments of the present invention are described below with reference to the accompanying drawings:

[0030] Example 1: A high-pressure common rail quick-response fuel injector adopting the axial misalignment control of the present invention, such as Figure 2-Figure 8As shown, it includes an injector body 10, an actuator 20, a control valve core 30, a control valve seat 40, a needle valve body 60, a needle valve 70, a fastening cap 90, a nozzle spring 15, a nozzle spring seat 11 and a hydraulic throttle valve, the hydraulic throttle valve, as shown Figure 1 As shown, it includes an end face throttling channel 1, a side throttling channel 2, a first end face oblique channel 3, a valve shoulder side channel 4, a second end face oblique channel 5, a first valve core guide hole 6, a valve core upper end face 7 and a valve core oil storage chamber 8. The end face throttling channel 1, the first valve core guide hole 6 and the valve core oil storage chamber 8 are coaxially arranged. The valve core oil storage chamber 8 is arranged between the first valve core guide hole 6 and the end face throttling channel 1. The side throttling channel 2 is communicated with the valve core oil storage chamber 8. The first end face oblique channel 3 is communicated with the valve shoulder side channel 4. The valve shoulder side channel 4 is communicated with the low-pressure oil circuit. The throttle channel 1 communicates with the integrated cavity 402 of the control valve seat 40; the first oblique channel 3 on the end surface communicates with the end surface groove 305 of the control valve core 30; the hydraulic throttle valve is connected to the lower end surface 408 of the control valve seat 40 at the top and to the needle valve body 60 at the bottom, ensuring that the first oblique channel 3 on the end surface communicates with the end surface groove 305, and the second oblique channel 5 on the end surface communicates with the valve seat oil inlet channel 405; the injector body 10 is provided with a main oil passage 12 and a high-pressure oil passage 13 that communicate with each other; and the actuator oil inlet passage 22 and the spring passage 21 are designed on the top.

[0031] The control valve seat 40 is provided with a second valve core guide hole 401, a comprehensive cavity 402, an oil inlet cone surface 403, an oil ring groove 404, a valve seat oil inlet passage 405, an inclined oil passage 406, a valve seat upper end surface 407, a valve seat lower end surface 408 and a valve core cavity 409. The second valve core guide hole 401, the oil inlet cone surface 403, the oil ring groove 404 and the valve core cavity 409 are coaxially arranged. The oil ring groove 404 is arranged on the second valve core guide hole 401. The valve core cavity 409 and the integrated accommodating cavity 402 are arranged at the upper and lower ends of the second valve core guide hole 401. The oil inlet cone surface 403 is arranged between the integrated accommodating cavity 402 and the lower end surface of the second valve core guide hole 401. The inclined oil passage 406 is arranged between the valve seat oil inlet passage 405 and the oil ring groove 404. The valve seat upper end surface 407 and the valve seat lower end surface 408 are both flat. The center of the second valve core guide hole 401 is offset from the center of the control valve seat 40.

[0032] The control valve core 30 includes a valve core column and an armature disc 300, and the valve core column includes a guide column 301, an intermediate sealing section 302, an inner concave space 303, an oil storage groove 304, an end face groove 305, a lower end face 306 of a guide rod, an oil storage groove conical surface 307, an axial limiting column 308 and a spring limiting section 309. The intermediate sealing section 302, the inner concave space 303 and the oil storage groove 304 are all arranged on the guide column 301, and the axial limiting column 308 is arranged on the guide column 3 01, the spring limiting section 309 is provided at the upper end of the guide column 301, the end surface groove 305 is provided at the center of the lower end surface 306 of the guide rod, and the oil storage groove conical surface 307 is provided on the lower side of the oil storage groove 304. The guide column 301 of the valve core column, the intermediate sealing section 302 and the second valve core guide hole 401 of the control valve seat 40 are all in a pair-type precision clearance fit relationship; the diameter of the axial limiting column 308 is larger than the diameter of the second valve core guide hole 401;

[0033] The armature plate 300 is fixedly connected to the guide post 301 through an interference fit through the center hole. After the injector assembly is assembled, when the injector assembly is not injecting fuel, the top surface of the armature plate 300 is lower than the upper end surface 407 of the valve seat, forming an opening and closing top gap between the two. The height of the opening and closing top gap is 0.01 to 1.5 mm.

[0034] The center of the needle valve body 60 is provided with an upper oil storage chamber 601, a valve needle guide hole 602, an intermediate oil storage chamber 603 and a lower oil storage chamber 604 in order from top to bottom along the axial direction;

[0035] The needle valve 70 includes an upper guide rod 701, an oil inlet guide section 702, and a lower rod body 703. An axial oil inlet structure 704 is provided on the cylindrical surface of the oil inlet guide section 702. The axial oil inlet structure 704 is an axial oil inlet groove. An axial limit surface 705 is formed at the junction of the upper guide rod 701 and the oil inlet guide section 702. The upper guide rod 701 of the needle valve 70 is in a mating relationship with the first valve core guide hole 6, and the oil inlet guide section 702 is in a precise clearance fit with the valve needle guide hole 602.

[0036] The connection relationship between the components is:

[0037] The needle valve 70 is mounted in the needle valve body 60. The hydraulic throttle valve is connected to the upper end surface of the needle valve 70. The first valve core guide hole 6 is mounted on the upper guide rod 701 of the needle valve 70. The lower end surface 408 of the valve seat of the control valve seat 40 is connected to the upper end surface 7 of the valve core. The valve seat oil inlet passage 405 is aligned with the second oblique passage 5 of the end surface. The control valve core 30 is mounted in the second valve core guide hole 401 of the control valve seat 40 through the guide column 301. The actuator 20 is arranged between the injector body 10 and the control valve seat 40 to ensure that the high-pressure oil passage 13, the actuator oil inlet passage 22 and the valve seat oil inlet are connected. The channels 405 are aligned and connected, the actuator spring 80 and the actuator spring seat 14 are placed in the spring channel 21 of the actuator 20, the actuator spring seat 14 is located below the actuator spring 80, and is sleeved on the spring limiting section 309, the nozzle spring 15 and the nozzle spring seat 11 are sleeved on the upper guide rod 701, the nozzle spring 15 is located above the nozzle spring seat 11, and the fastening cap 90 is screwed on the lower end of the injector body 10, fixing the actuator 20, the control valve core 30, the control valve seat 40, the hydraulic throttle valve and the needle valve body 60 on the injector body 10 in an axially sealed manner.

[0038] There are many implementation methods of the present invention, which are not listed here one by one. As long as all solutions that adopt the functional substitution of the present invention are within the scope of protection.

Claims

1. A high-pressure common rail quick-response injector with axial misalignment control, characterized by: The invention comprises an injector body (10), an actuator (20), a control valve core (30), a control valve seat (40), a needle valve body (60), a needle valve (70), a fastening cap (90), an oil nozzle spring (15), an oil nozzle spring seat (11) and a hydraulic throttle valve, wherein the hydraulic throttle valve comprises an end face throttling channel (1), a side face throttling channel (2), a first end face inclined channel (3), a valve shoulder side channel (4), a second end face inclined channel (5), a first valve core guide hole (6), an upper end face of the valve core (7) and a valve core oil storage chamber (8), wherein the end face throttling channel (1), the first valve core guide hole (6) and the valve core oil storage chamber (8) are coaxially arranged, the valve core oil storage chamber (8) is arranged between the first valve core guide hole (6) and the end face throttling channel (1), and the side face throttling channel (2) is communicated with the valve core oil storage chamber (8) The first oblique channel (3) on the end face is communicated with the side channel (4) of the valve shoulder, and the side channel (4) of the valve shoulder is communicated with the low-pressure oil circuit; the throttling channel (1) on the end face is communicated with the integrated volume (402) of the control valve seat (40); the first oblique channel (3) on the end face is communicated with the end face groove (305) of the control valve core (30); the hydraulic throttle valve is docked with the lower end face (408) of the valve seat of the control valve seat (40) on the upper side, and docked with the needle valve body (60) on the lower side, ensuring that the first oblique channel (3) on the end face is communicated with the end face groove (305), and the second oblique channel (5) on the end face is communicated with the valve seat oil inlet channel (405); a main oil channel (12) and a high-pressure oil channel (13) are provided on the injector body (10); an actuator oil inlet channel (22) and a spring channel (21) are designed on the actuator (20). The control valve seat (40) is provided with a second valve core guide hole (401), a comprehensive cavity (402), an oil inlet cone surface (403), an oil ring groove (404), a valve seat oil inlet passage (405), an inclined oil passage (406), a valve seat upper end surface (407), a valve seat lower end surface (408) and a valve core cavity (409). The second valve core guide hole (401), the oil inlet cone surface (403), the oil ring groove (404) and the valve core cavity (409) are coaxially arranged. The oil ring groove (404) is arranged in the second valve core guide hole (401). 1), the valve core cavity (409) and the integrated accommodating cavity (402) are arranged at the upper and lower ends of the second valve core guide hole (401), the oil inlet cone surface (403) is arranged between the integrated accommodating cavity (402) and the lower end surface of the second valve core guide hole (401), the inclined oil passage (406) is arranged between the valve seat oil inlet passage (405) and the oil ring groove (404), the valve seat upper end surface (407) and the valve seat lower end surface (408) are both planes; the center of the second valve core guide hole (401) is offset from the center of the control valve seat (40).

2. The high-pressure common rail quick-response injector with axial misalignment control according to claim 1, characterized in that: The control valve core (30) includes a valve core column and an armature disc (300), wherein the valve core column includes a guide column (301), an intermediate sealing section (302), an inner concave space (303), an oil storage groove (304), an end face groove (305), a guide rod lower end face (306), an oil storage groove conical surface (307), an axial limiting column (308) and a spring limiting section (309), wherein the intermediate sealing section (302), the inner concave space (303) and the oil storage groove (304) are all arranged on the guide column (301), and the axial limiting column (308) is arranged on the guide rod. The spring limiting section (309) is arranged at the lower end of the guide column (301), the end surface groove (305) is arranged at the center of the lower end surface (306) of the guide rod, and the oil storage groove conical surface (307) is arranged on the lower side of the oil storage groove (304). The guide column (301) of the valve core column, the middle sealing section (302) and the second valve core guide hole (401) of the control valve seat (40) are all in a pair-type precision clearance fit relationship; the diameter of the axial limiting column (308) is larger than the diameter of the second valve core guide hole (401); The armature disc (300) is fixedly connected to the guide column (301) through interference fit between the center hole; after the injector assembly is assembled, when the injector assembly is in a non-injecting working state, the cover top surface of the armature disc (300) is lower than the upper end surface (407) of the valve seat, and an opening and closing top gap is formed between the two, and the height of the opening and closing top gap is 0.01 to 1.5 mm.

3. The high-pressure common rail quick-response injector with axial misalignment control according to claim 1, characterized in that: The center of the needle valve body (60) is provided with an upper oil storage chamber (601), a valve needle guide hole (602), a middle oil storage chamber (603) and a lower oil storage chamber (604) in sequence from top to bottom along the axial direction.

4. The high-pressure common rail quick-response injector with axial misalignment control according to claim 1, characterized in that: The needle valve (70) comprises an upper guide rod (701), an oil inlet guide section (702) and a lower rod body (703). An axial oil inlet structure (704) is provided on the cylindrical surface of the oil inlet guide section (702). The axial oil inlet structure (704) is an axial oil inlet groove. An axial limit surface (705) is formed at the junction of the upper guide rod (701) and the oil inlet guide section (702). The upper guide rod (701) of the needle valve (70) and the first valve core guide hole (6) are in a mating fit relationship, and the oil inlet guide section (702) and the valve needle guide hole (602) are precisely fitted with each other.

5. The high-pressure common rail quick-response injector with axial misalignment control according to claim 1, characterized in that: The needle valve (70) is sleeved in the needle valve body (60), the hydraulic throttle valve is connected to the upper end surface of the needle valve (70), the first valve core guide hole (6) is sleeved on the upper guide rod (701) of the needle valve (70), the valve seat lower end surface (408) of the control valve seat (40) is connected to the valve core upper end surface (7), the valve seat oil inlet passage (405) is aligned with the end surface second inclined passage (5), the control valve core (30) is sleeved in the second valve core guide hole (401) of the control valve seat (40) through the guide column (301), and the actuator (20) is arranged between the injector body (10) and the control valve seat (40), ensuring that the high-pressure oil passage (13), the actuator oil inlet passage (22) and the valve seat inlet passage are aligned. The oil passages (405) are aligned and communicated with each other. The actuator spring (80) and the actuator spring seat (14) are placed in the spring passage (21) of the actuator (20). The actuator spring seat (14) is located below the actuator spring (80) and is sleeved on the spring limit section (309). The nozzle spring (15) and the nozzle spring seat (11) are sleeved on the upper guide rod (701). The nozzle spring (15) is located above the nozzle spring seat (11). The fastening cap (90) is screwed on the lower end of the injector body (10) to axially seal the actuator (20), the control valve core (30), the control valve seat (40), the hydraulic throttle valve and the needle valve body (60) on the injector body (10).

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