A quick response fuel injector

Abstract

The present application provides a kind of simple structure's quick response fuel injector for more quickly realizing the accurate control to the injection quantity of fuel injector, including fuel injector body, and needle valve shell is sleeved below fuel injector body, electromagnetic valve, sealing valve seat, metering valve and needle valve assembly are sequentially arranged from top to bottom in needle valve shell;Metering valve includes first valve body, wherein first valve body is provided with first metering hole and second metering hole in the form of through hole structure;Sealing valve seat is slidably provided with armature shaft, and armature shaft is further provided with armature seat;The first taper of first taper armature shaft is provided with second taper on the upper end of armature seat, and the first taper is matched with the second taper.In the present application, the length of needle valve is reduced by built-in electromagnetic valve;And by the taper cooperation of armature seat and armature shaft, and the second metering hole is increased on the valve body of metering valve, the rising or falling of needle valve is more rapid, and the response speed of fuel injector is effectively improved.

Description

Technical Field

[0001] This application relates to the field of fuel injector technology, and more particularly to a fast-response fuel injector. Background Technology

[0002] The main function of fuel injectors is to inject precisely measured amounts of fuel into the combustion chamber to control the combustion process. How to complete the fuel injection action in a very short time to meet the changing fuel demands of the engine has been a constant goal for industry professionals.

[0003] Many factors affect the response speed of fuel injectors, including injector structure, fuel pressure, control circuit, fuel temperature, and ambient temperature. Among these, the complexity of the injector structure, the materials of its internal components, and the machining precision all affect the injector's response speed.

[0004] In the existing fast-response injector structure, the applicant's Chinese patent CN202021190584.0, "Common rail injector with fast switching function," filed in 2020, has an oil metering orifice inside the metering valve and an oil inlet metering orifice on the side of the needle valve sleeve. Although this structure can improve the injection effect of the common rail injector and improve the fuel economy, it is still desirable to further improve the feedback speed of the needle valve control and further improve the response speed and accuracy of fuel control. Summary of the Invention

[0005] The purpose of this invention is to provide a fast-response fuel injector with a simple structure. To achieve the above objective, the technical solution adopted by this invention is as follows: a fast-response fuel injector includes an injector body and a needle valve housing sleeved below the injector body. Within the needle valve housing, from top to bottom, a solenoid valve, a sealing valve seat, a metering valve, and a needle valve assembly are sequentially arranged. The sealing valve seat abuts against the injector body, and a space for accommodating the solenoid valve body is formed between them. The metering valve abuts against the sealing valve seat, and an armature transformer chamber is formed between them. The needle valve assembly abuts against the metering valve, and a needle valve control chamber and a high-pressure control chamber are formed between them.

[0006] The metering valve includes a first valve body, wherein the first valve body is provided with a first metering hole and a second metering hole in the form of a through hole, and the first metering hole connects the armature transformer chamber area and the needle valve control chamber area; the upper end of the second metering hole is located in the armature transformer chamber area.

[0007] An armature shaft is slidably disposed within the sealing valve seat. An armature transformer area is also provided at the lower end of the sealing valve seat, and an armature seat is sleeved on the armature shaft within the armature transformer area. The armature seat has a cylindrical structure with a first through hole in the middle, and also includes a first conical surface at the upper end of the armature seat and a second flat surface at the lower end. The armature shaft is provided with a second conical surface, and the first conical surface matches the second conical surface.

[0008] Furthermore, the lower end of the second metering orifice is located in the needle valve control chamber area.

[0009] Furthermore, the first valve body is also provided with a third metering hole in the form of a through hole. The upper end of the third metering hole is connected to the oil inlet hole, and the lower end is located in the needle valve control chamber area.

[0010] Furthermore, the small end diameter of the first metering orifice is larger than the small end diameter of the third metering orifice.

[0011] Furthermore, a first oil groove is provided between the third metering hole and the oil inlet hole.

[0012] Furthermore, the lower end of the second metering orifice is located in the high-pressure control chamber region.

[0013] Furthermore, the first through hole in the armature seat also includes a straight hole section, and a second outer shaft is provided at the end of the armature shaft. The inner diameter of the straight hole section matches the outer diameter of the second outer shaft, and multiple flat parts are evenly provided on the first outer shaft.

[0014] Furthermore, a second groove is provided between the second conical surface of the armature shaft and the second outer shaft.

[0015] Furthermore, the armature transformer area is also provided with a second oil tank.

[0016] Furthermore, multiple second oil tanks are provided, and the second oil tanks are arranged along the tangential direction of the armature seat.

[0017] Furthermore, the sealing valve seat is provided with multiple oil inlet holes and oil return holes.

[0018] Compared with the prior art, the present invention, in its specific implementation, includes an injector body and a needle valve housing fitted below the injector body. Within the needle valve housing, from top to bottom, are arranged a solenoid valve, a sealing valve seat, a metering valve, and a needle valve assembly. An integrated solenoid valve structure is adopted, where the sealing valve seat abuts against the injector body, forming a space between them to accommodate the solenoid valve body. This saves volume, primarily by reducing the needle valve length and inertia, thereby improving the injector's feedback speed and accuracy, and further enhancing the response speed and accuracy of fuel control. The metering valve abuts against the sealing valve seat, forming an armature pressure-changing chamber between them. A combination of conical and planar seals is used within the armature pressure-changing chamber to improve the reliability of the injector's rapid response. The needle valve assembly abuts against the metering valve, forming a needle valve control chamber and a high-pressure control chamber between them. Improving the metering valve structure further enhances the injector's response speed, as detailed below.

[0019] The upper end of the metering valve mates with the armature valve seat of the electromagnet, and the armature transformer chamber area at the upper end of the metering valve mates with the armature valve seat to form an armature transformer chamber. The lower end of the metering valve mates with the needle valve sleeve, and the needle valve control chamber area located in the middle of the lower end of the first valve body of the metering valve is located inside the needle valve sleeve, forming a needle valve control chamber. The area at the lower end of the first valve body of the metering valve, outside the needle valve sleeve and inside the injector body, is the high-pressure control chamber area, forming a high-pressure control chamber with the needle valve sleeve and the injector body in this area. After fuel enters the needle valve control chamber, the first metering orifice connects the needle valve control chamber and the armature transformer chamber. By adding a second metering orifice to the first valve body of the metering valve, the second metering orifice is also a through hole, and its upper end is connected to the armature transformer chamber.

[0020] When the injector needs to inject fuel, the solenoid valve drives the armature shaft to lift, opening the fuel outlet channel in the armature transformer chamber. The pressure in the armature transformer chamber decreases, and the fuel in the needle valve control chamber flows into the armature transformer chamber through the first metering orifice. The flow rate out of the needle valve control chamber through the first metering orifice is greater than the flow rate entering the needle valve control chamber through the inlet metering orifice, causing the pressure in the needle valve control chamber to decrease. The needle valve then lifts, and the injector begins to inject fuel.

[0021] When the fuel injection ends, the solenoid valve drives the armature shaft to sit down, closing the fuel outlet channel in the armature transformer chamber. At the same time, the fuel in the armature transformer chamber enters the needle valve control chamber through the first metering hole and the second metering hole, causing the pressure in the needle valve control chamber to rise rapidly, the needle valve to sit down, and the fuel injection ends.

[0022] An armature shaft is slidably disposed within a sealing valve seat, and a solenoid valve is connected to the upper end of the armature shaft. The solenoid valve is disposed within the injector body. An armature pressure-changing area is also disposed at the lower end of the sealing valve seat, and the armature pressure-changing area and the upper end of the first valve body form an armature pressure-changing chamber. An armature seat is sleeved on the armature shaft within the armature pressure-changing chamber. Through the sealing contact or gap setting between the armature seat and the armature shaft, the needle valve in the injector is lowered or raised, thereby achieving the effect of closing or starting fuel injection.

[0023] In this invention, the armature seat has a cylindrical structure. A second flat surface is provided at the lower end of the armature seat, which forms a planar seal with the upper end surface of the first valve body to prevent fuel from directly entering the first valve body from the lower end of the armature seat. A first through hole is provided inside the armature seat, and the first through hole communicates with the main return oil hole of the first valve body. A first conical surface is provided at the upper end of the first through hole. The armature shaft is sleeved in the first through hole, and the armature shaft is also provided with a second conical surface. The first conical surface and the second conical surface form a conical sealing fit. When the solenoid valve drives the armature shaft to rise, the second conical surface of the armature shaft separates from the first conical surface of the armature seat. At this time, fuel flows through the first through hole of the armature seat to the main return oil hole of the first valve body, and the needle valve in the injector rises to start injecting fuel. When the solenoid valve drives the armature shaft to fall, the second conical surface of the armature shaft abuts against the first conical surface of the armature seat to form a conical seal, disconnecting the return oil channel of fuel from the armature transformer chamber to the first valve body. The needle valve in the injector falls to close the fuel injection.

[0024] In this invention, the length of the needle valve is reduced by using a built-in solenoid valve, thereby improving the accuracy and response time of fuel injection control. Furthermore, the armature seat and the tapered surface of the armature shaft are easily machined and maintained, resulting in more precise fuel injection control. Additionally, a second metering orifice is added to the metering valve body, allowing the needle valve to rise or fall more rapidly, effectively improving the fuel injection or shut-off response speed of the injector. This allows for faster and more precise control of the fuel injection quantity, thereby improving engine performance and fuel economy. Attached Figure Description

[0025] Figure 1 This is a first-view schematic diagram of a fast-response fuel injector according to the present invention.

[0026] Figure 2 This is a second-view schematic diagram of a fast-response fuel injector according to the present invention.

[0027] Figure 3 for Figure 2 Enlarged view of a portion of the image;

[0028] Figure 4 This is a first-view schematic diagram of the metering valve in this invention;

[0029] Figure 5 for Figure 4 Enlarged view of a portion of the image;

[0030] Figure 6 This is a cross-sectional view of the first metering orifice of the metering valve in this invention from a second perspective;

[0031] Figure 7 This is a cross-sectional view of the second metering orifice of the metering valve in this invention from a second perspective;

[0032] Figure 8This is a schematic cross-sectional view of the third metering orifice of the metering valve in this invention from a second perspective.

[0033] Figure 9 This is a first-view schematic diagram of the sealing valve seat of the present invention;

[0034] Figure 10 This is a first-view schematic diagram of the sealing valve seat of the present invention;

[0035] Figure 11 for Figure 10 Enlarged view of a portion of point A in the middle;

[0036] Figure 12 This is a first-view schematic diagram of the armature holder of the present invention;

[0037] Figure 13 This is a first-view schematic diagram of the armature shaft of the present invention;

[0038] Figure 14 This is a schematic diagram of the armature shaft from a second perspective of the present invention;

[0039] Explanation of reference numerals in the attached figures:

[0040] 120 Solenoid valve, 140 Armature shaft, 130 Needle valve, 200 Sealing valve seat, 210 Armature shaft, 211 Second groove, 212 Second conical surface, 213 Second outer shaft, 214 Flat part, 220 Armature seat, 221 First through hole, 222 First conical surface, 223 Straight hole section, 224 Second plane, 231 Second oil groove, 232 Oil inlet hole, 300 Metering valve, 310 First valve body, 311 Oil inlet hole, 3121 Main return oil hole, 3122 Auxiliary return oil hole, 313 First oil groove, 321 Armature transformer chamber, 322 Needle valve control chamber, 323 High pressure control chamber, 331 First metering hole, 332 Second metering hole, 333 Third metering hole, 334 Positioning hole, 335 Second oil inlet hole, 410 Injector body, 420 Needle valve housing. Detailed Implementation

[0041] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] In the description of this invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0043] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] As attached Figure 1-3 As shown, this embodiment of a fast-response injector includes an injector body and a needle valve housing fitted below the injector body. Within the needle valve housing, from top to bottom, are arranged a solenoid valve, a sealing valve seat, a metering valve, and a needle valve assembly. The sealing valve seat abuts against the injector body, forming a space between them to accommodate the solenoid valve body. The metering valve abuts against the sealing valve seat, forming an armature transformer chamber between them. The needle valve assembly abuts against the metering valve, forming a needle valve control chamber and a high-pressure control chamber between them.

[0045] Reference Appendix Figure 4-8 The metering valve includes a first valve body, wherein the first valve body is provided with a first metering hole and a second metering hole in the form of a through hole, and the first metering hole connects the armature transformer chamber area and the needle valve control chamber area; the upper end of the second metering hole is located in the armature transformer chamber area.

[0046] Reference Appendix Figure 9-14 An armature shaft is slidably disposed inside the sealing valve seat. An armature transformer area is also provided at the lower end of the sealing valve seat, and an armature seat is sleeved on the armature shaft within the armature transformer area. The armature seat has a cylindrical structure with a first through hole in the middle. It also includes a first conical surface at the upper end of the armature seat and a second flat surface at the lower end. The armature shaft is provided with a second conical surface, and the first conical surface matches the second conical surface.

[0047] In its specific implementation, this invention includes an injector body and a needle valve housing fitted below the injector body. Within the needle valve housing, from top to bottom, are arranged a solenoid valve, a sealing valve seat, a metering valve, and a needle valve assembly. An integrated solenoid valve structure is adopted, where the sealing valve seat abuts against the injector body, forming a space between them to accommodate the solenoid valve body. This saves volume, primarily by reducing the needle valve length and inertia, thereby improving the injector's feedback speed and accuracy, and further enhancing the response speed and accuracy of fuel control. The metering valve abuts against the sealing valve seat, forming an armature pressure-transforming chamber between them. This armature pressure-transforming chamber employs a combination of conical and planar seals to improve the reliability of the injector's rapid response. The needle valve assembly abuts against the metering valve, forming a needle valve control chamber and a high-pressure control chamber between them. Improving the metering valve structure further enhances the injector's response speed.

[0048] Reference Appendix Figure 1-8 The metering valve 300 includes a first valve body 310, which is provided with three oil inlet holes 311 and three oil return holes. Fuel is introduced into the first valve body 310 through the three oil inlet holes 311 and sent to a designated position. Fuel is sent out of the first valve body 310 through the oil return holes. In this embodiment, the oil return holes include a main oil return hole 3121 and auxiliary oil return holes 3122 located on both sides of the main oil return hole 3121. The three oil return holes are connected in the first valve body 310.

[0049] The first valve body 310 is provided with a first metering hole 331 and a second metering hole 332 in the form of a through hole. The first metering hole 331 connects the armature transformer chamber 321 region and the needle valve control chamber 322 region. The upper end of the second metering hole 332 is located in the armature transformer chamber 321 region, and the lower end of the second metering hole 332 is connected to the needle valve control chamber 322 in this embodiment.

[0050] When the injector needs to inject fuel, the solenoid valve 120 drives the armature shaft 140 to lift, opening the fuel outlet passage in the armature transformer chamber 321. The pressure in the armature transformer chamber 321 decreases, and fuel in the needle valve control chamber 322 flows into the armature transformer chamber 321 simultaneously through the first metering orifice 331 and the second metering orifice 332, causing the pressure in the needle valve control chamber 322 to decrease. At this time, the needle valve 130 lifts, and the injector begins to inject fuel. When fuel injection ends, the solenoid valve 120 drives the armature shaft 140 to sit down, closing the fuel outlet passage in the armature transformer chamber 321. Fuel in the armature transformer chamber 321 simultaneously enters the needle valve control chamber 322 through the first metering orifice 331 and the second metering orifice 332, causing the pressure in the needle valve control chamber 322 to rise rapidly. The needle valve 130 then sits down, and fuel injection ends.

[0051] An armature shaft 210 is slidably disposed within a sealing valve seat 200. A solenoid valve 120 is connected to the upper end of the armature shaft 210, and the solenoid valve 120 is disposed within the injector body 410. An armature pressure-changing area is also disposed at the lower end of the sealing valve seat 200, and the armature pressure-changing area and the upper end of the first valve body 310 form an armature pressure-changing cavity 321. An armature seat 220 is sleeved on the armature shaft 210 within the armature pressure-changing cavity 321. Through the sealing contact or gap setting between the armature seat 220 and the armature shaft 210, the needle valve 130 in the injector is lowered or raised, thereby achieving the effect of closing or starting the injection.

[0052] In this invention, the armature seat 220 has a cylindrical structure. A second plane 224 is provided at the lower end of the armature seat 220, which forms a planar seal with the upper end face of the first valve body 310 to prevent fuel from directly entering the first valve body 310 from the lower end of the armature seat 220. A first through hole 221 is provided in the armature seat 220, and the first through hole 221 communicates with the main oil return hole 3121 of the first valve body 310. A first conical surface 222 is provided at the upper end of the first through hole 221. The armature shaft 210 is sleeved in the first through hole 221, and the armature shaft 210 is also provided with a second conical surface 212. The first conical surface 222 and the second conical surface 212 form a conical sealing fit. When the solenoid valve 120 drives the armature shaft 210 to rise, the second conical surface 212 of the armature shaft 210 separates from the first conical surface 222 of the armature seat 220. At this time, fuel flows through the first through hole 221 of the armature seat 220 to the main return oil hole 2333121 of the first valve body 310, and the needle valve 130 in the injector rises to start injecting fuel. When the solenoid valve 120 drives the armature shaft 210 to fall, the second conical surface 212 of the armature shaft 210 and the first conical surface 222 of the armature seat 220 abut against each other to form a conical seal, which disconnects the return oil passage of fuel from the armature transformer chamber 321 to the first valve body 310. The needle valve 130 in the injector falls to close the fuel injection.

[0053] In this embodiment, firstly, by using a built-in solenoid valve, the length of the needle valve is reduced, improving the accuracy and response time of fuel injection control. Secondly, by adding a second metering orifice 332 to the metering valve, the rise or fall of the needle valve 130 becomes more rapid, effectively improving the fuel injection or shut-off response speed of the injector. This allows for faster and more precise control of the fuel injection quantity, thereby improving engine performance and fuel economy. Furthermore, a conical fit is chosen between the armature seat and the armature shaft to achieve a sealing effect, which is simple to process, easy to maintain, and provides more precise fuel injection control. Additionally, in the prior art, a sealing hemisphere is assembled on the armature shaft 210, and the armature shaft 210 drives the sealing hemisphere to move up and down, relying on the direct sealing contact or gap setting between the sealing hemisphere and the first valve body 310 to achieve fuel injection shut-off or start-up. In contrast, this invention directly achieves fuel injection shut-off or start-up through the sealing contact or gap setting between the armature shaft 210 and the armature seat 220, resulting in more precise control and further improving engine performance and fuel economy.

[0054] In summary, the injector shown in this embodiment, compared with the injectors in the prior art, can achieve precise control of the fuel injection quantity more quickly, thereby improving engine performance and fuel economy.

[0055] In other embodiments of this application, the upper end of the second metering orifice 332 is connected to the armature transformer chamber 321, and the lower end is connected to the high-pressure control chamber 323. When the injector needs to inject fuel, the solenoid valve 120 drives the armature shaft 140 to lift, opening the oil outlet channel in the armature transformer chamber 321, causing the pressure in the armature transformer chamber 321 to decrease. Fuel in the needle valve control chamber 322 flows into the armature transformer chamber 321 through the first metering orifice 331. At the same time, fuel in the high-pressure control chamber 323 enters the armature transformer chamber 321 through the second metering orifice 332, reducing the amount of fuel entering the needle valve control chamber 322, causing the pressure in the needle valve control chamber 322 to decrease. The needle valve 130 then lifts, and the injector begins to inject fuel. At the end of fuel injection, the solenoid valve 120 drives the armature shaft 140 to seat, closing the fuel outlet passage in the armature transformer chamber 321. Fuel in the armature transformer chamber 321 enters the needle valve control chamber 322 through the first metering orifice 331. Simultaneously, fuel in the high-pressure control chamber 323 enters the armature transformer chamber 321 through the second metering orifice 332, and then again through the first metering orifice 331 into the needle valve control chamber 322. This increases the fuel quantity compared to existing technologies or other embodiments, causing a rapid increase in pressure within the needle valve control chamber 322. The needle valve 130 then seats, ending the fuel injection. Similarly, this embodiment, by adding the second metering orifice 332, allows for a more rapid rise or fall of the needle valve 130, effectively improving the fuel injection or shut-off response speed of the injector. This enables faster and more precise control of the fuel injection quantity, thereby improving engine performance and fuel economy.

[0056] In this invention, the diameters of the first metering orifice 331 and the second metering orifice 332 are both of a structure with a larger diameter at the bottom and a smaller diameter at the top. That is, the diameter is smaller on the side closer to the armature transformer chamber 321 and larger on the side closer to the needle valve control chamber 322.

[0057] In another embodiment of the present invention, a third metering hole 333 with a through-hole structure is also provided on the first valve body 310. The upper end of the third metering hole 333 communicates with the oil inlet hole 311, and the lower end is located in the needle valve control chamber 322 area. As an oil inlet metering hole, the third metering hole 333 has a larger diameter on the side near the armature transformer chamber 321 and a smaller diameter on the side near the needle valve control chamber 322. By providing the third metering hole 333 on the first valve body 310 of the metering valve 300, the accuracy of the injector injection can be further improved. The control principle can be referred to the foregoing embodiments. Furthermore, a first oil groove 313 is provided between the third metering orifice 333 and the oil inlet orifice 311. That is, on the side of the first valve body 310 of the metering valve 300 near the armature transformer chamber 321, the third metering orifice 333 and the oil inlet orifice 311 are connected through the first oil groove 313. Fuel in the oil inlet orifice 311 can flow through the first oil groove 313 to the third metering orifice 333, and then enter the needle valve control chamber 322. By adding the first oil groove 313, the smoothness of fuel flow is increased, which can also indirectly improve engine performance and fuel economy. Furthermore, when the flow rate out of the needle valve control chamber 322 from the first metering orifice 331 is greater than the flow rate entering the needle valve control chamber 322 through the third metering orifice 333, that is, when the small end diameter of the first metering orifice 331 is larger than the small end diameter of the third metering orifice 333, this structure provides more precise control of the injector's fuel injection during use.

[0058] In other embodiments of the present invention, the first through hole 221 in the armature seat 220 further includes a straight hole segment 223, as shown in the attached drawing. Figure 12As can be seen, the first through hole 221 has, from top to bottom, a first conical surface 222 hole segment, a straight hole segment 223, a third conical hole segment, and a fourth conical hole segment; the end of the armature shaft 210 is provided with a second outer shaft 213, that is, at the straight hole segment 223, the second outer shaft 213 moves with the up and down movement of the armature shaft 210; in this embodiment, the inner diameter of the straight hole segment 223 and the outer diameter of the second outer shaft 213 are matched, so that the up and down movement of the second outer shaft 213 is more consistent; secondly, a plurality of flat portions 214 are evenly provided on the first outer shaft, as shown in the figure, four flat portions 214 are provided. By providing flat portions 214, a gap is formed between the second outer shaft 213 and the straight hole segment 223. When the armature shaft 210 rises, fuel flows out from the gap formed at the flat portions 214. Because the flat portions 214 are evenly provided, the fuel flow in the structure of this application is more stable during use, and the control of the solenoid valve 120 is more consistent, thereby improving the performance of the engine and fuel economy. Secondly, in this embodiment, by matching the inner diameter of the straight hole section 223 with the outer diameter of the second outer shaft 213 and by uniformly arranging a plurality of flat portions 214, the consistency of the up-and-down movement of the armature shaft 210 and the uniformity of fuel flow can be further ensured.

[0059] In other embodiments of the present invention, reference is made to Figure 9-14 A second groove 211 is also provided between the second conical surface 212 and the second outer shaft 213 of the armature shaft 210. By providing the second groove 211, the fuel flow is more even during the return process, and the second groove 211 is concave in an arc shape, which can also prevent cavitation of fuel during the return process, further improving the stability and reliability of fuel flow.

[0060] In other embodiments of the present invention, reference is made to Figure 2 The armature transformer area is also provided with a second oil groove 231. By adding the second oil groove 231, when the structure of this application is used in conjunction with the fuel injector metering valve, the fuel flowing out of the metering valve can flow more evenly in the armature transformer area. In particular, the effect is best when the second oil groove 231 is arranged along the tangential direction of the armature seat 220. As shown in the figure, there are two second oil grooves 231 in this application. The fuel flowing out of the metering hole in the metering valve is in the area of ​​the second oil groove 231, and flows through the second oil groove 231 to the vicinity of the armature shaft 210.

[0061] In other embodiments of the present invention, referring to the accompanying drawings, the sealing valve seat 200 is provided with a plurality of three oil inlet holes 232 and two oil return holes 233. Integrating the oil inlet holes 232 and oil return holes 233 in this region of the injector body 410 into the sealing valve seat 200 can further optimize the overall volume of the injector body 410 and improve the stability of fuel flow.

[0062] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fast-response fuel injector, characterized in that: The device includes an injector body (410) and a needle valve housing (420) fitted below the injector body (410). Within the needle valve housing (420), from top to bottom, are arranged a solenoid valve (120), a sealing valve seat (200), a metering valve (300), and a needle valve assembly. The sealing valve seat (200) abuts against the injector body (410), forming a space between them to accommodate the solenoid valve body. The metering valve (300) abuts against the sealing valve seat (200), forming an armature transformer chamber (321) between them. The needle valve assembly abuts against the metering valve (300), forming a needle valve control chamber (322) and a high-pressure control chamber (323) between them. The metering valve (300) includes a first valve body (310), and the first valve body (310) is provided with a first metering hole (331) and a second metering hole (332) in the form of a through hole. The first metering hole (331) connects the armature transformer chamber (321) region and the needle valve control chamber (322) region. The upper end of the second metering orifice (332) is located in the area of ​​the armature transformer cavity (321); An armature shaft (210) is slidably disposed within the sealing valve seat (200). An armature transformer area is also provided at the lower end of the sealing valve seat (200), and an armature seat (220) is sleeved on the armature transformer area within the armature shaft (210). The armature seat (220) has a cylindrical structure with a first through hole (221) in the middle. It also includes a first conical surface (222) at the upper end of the armature seat (220) and a second flat surface (224) at the lower end. The armature shaft (210) is provided with a second conical surface (212), and the first conical surface (222) matches the second conical surface (212). The first through hole (221) in the armature seat (220) also includes a straight hole section (223), and a second outer shaft (213) is provided at the end of the armature shaft (210). The inner diameter of the straight hole section (223) and the outer diameter of the second outer shaft (213) are matched. Multiple flat parts (214) are evenly provided on the first outer shaft. A second groove (211) is also provided between the second conical surface (212) of the armature shaft (210) and the second outer shaft (213).

2. The fast-response injector according to claim 1, characterized in that: The lower end of the second metering orifice (332) is located in the area of ​​the needle valve control chamber (322).

3. The fast-response injector according to claim 2, characterized in that: The first valve body (310) is also provided with a third metering hole (333) in the form of a through hole. The upper end of the third metering hole (333) is connected to the oil inlet hole (311), and the lower end is located in the area of ​​the needle valve control chamber (322).

4. A fast-response injector according to claim 3, characterized in that: The small end diameter of the first metering orifice (331) is larger than the small end diameter of the third metering orifice (333).

5. A fast-response injector according to claim 3 or 4, characterized in that: A first oil groove (313) is provided between the third metering hole (333) and the oil inlet hole (311).

6. A fast-response injector according to claim 1, characterized in that: The lower end of the second metering orifice (332) is located in the high-pressure control chamber (323) region.

7. A fast-response injector according to claim 1, 2, 3, 4 or 6, characterized in that: The armature transformer area is also provided with a plurality of second oil grooves (231), and the second oil grooves (231) are arranged along the tangential direction of the armature seat (220).

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