Fuel injector, engine and vehicle

Abstract

The present disclosure relates to an oil injector, an engine and a vehicle, comprising an injector body and an electromagnetic valve, the electromagnetic valve being assembled in the injector body, the electromagnetic valve comprising a magnetic core and an armature; the armature comprising a guide portion; an axial one end of the magnetic core is provided with a first cavity, an axial other end of the magnetic core is provided with a second cavity, the magnetic core is provided with an inner hole and a communication groove, the guide portion of the armature is assembled in the inner hole of the magnetic core; on the flow path of the medium, the second cavity communicates with the first cavity via the communication groove at a confluence portion, the confluence portion is located on the side of the magnetic core close to the first cavity. The oil injector of the present disclosure can solve the problem of poor control linearity and repeatability of the oil injection amount.

Description

Technical Field

[0001] Embodiments of this disclosure relate to the field of engine technology, and more particularly to an injector, engine, and vehicle. Background Technology

[0002] A fuel injector is a device similar to an industrial valve, which mainly uses electromagnetic coils to control the movement of a needle valve to atomize and inject fuel. However, in practical use, fuel injectors suffer from problems such as poor linearity and repeatability in fuel injection control, which in turn affects the engine's combustion efficiency and emission stability. Summary of the Invention

[0003] This disclosure aims to at least partially address one of the technical problems in the aforementioned background or related technologies.

[0004] To address this issue, this disclosure proposes an injector that can solve the problems of poor linearity and repeatability in controlling the injection quantity.

[0005] This disclosure also proposes an engine.

[0006] This disclosure also proposes a vehicle.

[0007] The injectors disclosed herein include: Injector body; A solenoid valve, which is assembled in the injector body, includes a magnetic core and an armature, and the armature includes a guide portion; The magnetic core has a first cavity at one axial end and a second cavity at the other axial end. The magnetic core has an inner hole and a connecting groove, and the guide portion of the armature is assembled in the inner hole of the magnetic core. In the flow path of the medium, the second cavity communicates with the first cavity via the connecting groove at the confluence, the confluence being located on the side of the magnetic core closer to the first cavity.

[0008] In some technical solutions, the confluence portion is located on the side of the magnetic core facing the first cavity.

[0009] In some technical solutions, the connecting groove extends through the magnetic core along the axial direction, and the confluence is located at the port of the connecting groove facing the first cavity.

[0010] In some technical solutions, the injector body is provided with a return oil channel, the confluence is located at the intersection of the first flow path, the second flow path and the return oil channel, and the confluence is connected to the return oil channel.

[0011] In some technical solutions, the magnetic core includes: An inner annular portion, wherein the inner hole is disposed within the inner annular portion; An outer annular portion, which surrounds the outer periphery of the inner annular portion; At least one of the inner annular portion and the outer annular portion is provided with the communicating groove.

[0012] In some technical solutions, the inner annular portion is provided with the communicating groove, which penetrates the inner annular portion along the axial direction, and the depth of the communicating groove in the radial direction of the inner annular portion is less than or equal to the thickness of the inner annular portion; And / or, the outer annular portion is provided with the communicating groove, the communicating groove extending through the outer annular portion along the axial direction, and the groove depth dimension of the communicating groove in the radial direction of the outer annular portion is less than or equal to the thickness dimension of the outer annular portion.

[0013] In some technical solutions, the magnetic core includes a connecting portion located at one axial end of the magnetic core and connected between the inner annular portion and the outer annular portion.

[0014] In some technical solutions, the inner annular portion is provided with a first connecting groove, the outer annular portion is provided with a second connecting groove, the connecting portion is provided with a connecting groove, one end of the connecting groove is connected to the first connecting groove, the other end of the connecting groove is connected to the second connecting groove, and the connecting groove forms at least part of the confluence portion.

[0015] In some technical solutions, the armature includes a tail portion, the guide portion is fitted inside the inner hole and is axially movable relative to the magnetic core, the tail portion is located on the side of the magnetic core facing the second cavity and is connected to the guide portion, and the tail portion is provided with a third connecting groove that penetrates the tail portion axially.

[0016] In some technical solutions, the return oil channel includes: A first axial segment and a second axial segment, both extending along the axial direction, are located on opposite sides of the armature in the radial direction, and the first axial segment communicates with the confluence portion.

[0017] In some technical solutions, the return oil channel further includes: An inclined segment, wherein the inclined segment is arranged at an angle relative to the axial direction, and one end of the inclined segment is connected to the first axial segment; The transverse segment has one end connected to the other end of the oblique segment, and the other end of the transverse segment is connected to the second axial segment.

[0018] In some technical solutions, the first axial segment and the second axial segment have an overlapping section in the axial direction, and the oblique segment and the transverse segment are disposed between the overlapping section of the first axial segment and the second axial segment.

[0019] In some technical solutions, the second flow path includes an oblique flow path segment, which connects the confluence and the first cavity.

[0020] Some technical solutions also include: A first elastic element is assembled in the first cavity, and the first elastic element abuts against the armature and the solenoid valve in the axial direction. The second elastic element is assembled in the second cavity and abuts against the armature and the threaded sleeve or regulating valve in the axial direction.

[0021] The engine disclosed herein includes an injector as described in any of the foregoing technical solutions.

[0022] The vehicle disclosed herein includes an injector as described in any of the foregoing technical solutions or includes an engine as described in any of the foregoing technical solutions.

[0023] Beneficial effects: The technical solution disclosed herein, through the redesign of the flow path, allows the confluence area of ​​different flow paths to be far away from the second cavity (armature cavity), thereby avoiding the disturbance and movement interference of oil pressure fluctuations on the armature. This enables the electromagnetic force of the solenoid valve to be universally used to drive the needle valve, making the opening and closing action of the needle valve more precise, thus significantly improving the control accuracy and consistency of the fuel injection quantity.

[0024] Secondly, the redesigned flow path also allows the oil to completely immerse the first chamber, meaning that the gas in the first chamber can be smoothly discharged, avoiding the situation of gas and liquid phases in the first chamber. This avoids the situation where there is a large order of magnitude difference in the compressibility of fuel and air, further reducing the back pressure sensitivity of the armature caused by this mixed environment. Attached Figure Description

[0025] The following description and accompanying drawings will better aid in understanding these and other features and advantages of the various embodiments disclosed herein, wherein the same reference numerals in the drawings consistently denote the same parts, wherein: Figure 1 This is a cross-sectional schematic diagram of an injector in the related art.

[0026] Figure 2 This is a cross-sectional schematic diagram of the injector disclosed herein.

[0027] Figure 3 This is a schematic cross-sectional view of the upper side of the injector disclosed herein. Figure 1 .

[0028] Figure 4 This is a three-dimensional schematic diagram of the magnetic core disclosed herein.

[0029] Figure 5 This is a schematic diagram of the tail section of this disclosure.

[0030] Figure 6 This is a schematic cross-sectional view of the upper side of the injector disclosed herein. Figure 2 .

[0031] Figure label: 100 - Armature cavity; 200 - Spring cavity; 1-Injector body; 11-Return oil passage; 111-First axial section; 112-Second axial section; 113-Oblique section; 114-Transverse section; 115-Overlapping section; 2-Solenoid valve; 21-Magnetic core; 211-Inner hole; 212-Communication groove; 213-Second main body part; 214-First main body part; 215-Inner annular part; 216-Outer annular part; 217-Assembly groove; 218-Connecting part; 2181-Connecting groove; 22-Armature; 221-Guide part; 222-Tail part; 2221-Disc-shaped part; 2222-Cylindrical part; 23-First communication groove; 24-Second communication groove; 25-Third communication groove; 3-First cavity; 4-Second cavity; 5-Oblique flow path; 6-Screw sleeve; 7-Skeleton; 8-Coil; 9-Regulating valve. Detailed Implementation

[0032] The technical solutions of this disclosure will be further described in detail below through embodiments and in conjunction with the accompanying drawings. In this specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of this disclosure with reference to the accompanying drawings is intended to explain the overall inventive concept of this disclosure and should not be construed as a limitation thereof.

[0033] It should be noted that this disclosure was made by the inventors based on the following facts, problems, and discoveries: In existing technologies, the spring chamber containing the armature of the injector's solenoid valve is a two-phase mixture of fuel and air. Due to the order-of-magnitude difference in compressibility between fuel and air, this mixture makes the armature back pressure extremely sensitive to minute pressure fluctuations and temperature changes within the fuel passage (high back pressure sensitivity). This sensitivity directly causes nonlinear fluctuations in the injector's flow characteristics, affecting the accuracy and consistency of fuel injection control.

[0034] Secondly, such as Figure 1As shown, the fuel circuit of the injector in the related technology mainly includes a main control fuel circuit and a gap leakage fuel circuit. The main control fuel circuit is the fuel circuit where fuel is directly depressurized through the drain hole into the armature cavity 100. The gap leakage fuel circuit is the fuel circuit that leaks through the gap between the armatures. The fuel in this circuit first flows to the spring cavity 200 and then merges into the armature cavity 100. That is, the main control fuel circuit and the gap leakage fuel circuit in the related technology converge near or within the armature cavity 100, specifically as follows... Figure 1 As shown at point A, this arrangement will cause poor exhaust of the spring chamber 200 and increase the disturbance to the armature chamber 100, which in turn makes the injector more sensitive to back pressure.

[0035] Based on the above, this disclosure proposes an injector.

[0036] like Figure 2 As shown, the injector disclosed herein includes an injector body 1 and a solenoid valve 2. The injector body 1 can be the housing of the injector. The solenoid valve 2 is assembled inside the injector body 1. The solenoid valve 2 includes a magnetic core 21 and an armature 22. The magnetic core 21 can be generally assembled inside the internal cavity of the injector body 1. The magnetic core 21 can be a cylindrical ring. The internal space of the magnetic core 21 forms an inner hole 211. The inner hole 211 can be located at the center of the magnetic core 21 and extends through the magnetic core 21 along its axial direction. The armature 22 can be assembled inside the inner hole 211 of the magnetic core 21. The armature 22 can move up and down relative to the magnetic core 21 along its axial direction. The up and down movement of the armature 22 can achieve the pressing or releasing of the ceramic ball on the bottom side, thereby meeting the use requirement of oil flowing towards the low-pressure area on the side facing the solenoid valve 2.

[0037] It should be noted that the various orientations in this disclosure can be the orientations of the injector in actual use, but do not represent a limitation on specific directions. For example, the axis of the injector can be vertical. In this case, the left side from bottom to top is left, the right side from bottom to top is right, the front side from bottom to top is front, and the rear side from bottom to top is rear.

[0038] A first cavity 3 is defined between one side of the magnetic core 21 in the axial direction and the injector body 1, and a second cavity 4 is defined between the other side of the magnetic core 21 in the axial direction and the injector body 1. The magnetic core 21 is provided with a connecting groove 212.

[0039] For example, such as Figure 2 As shown, when the solenoid valve 2 is assembled inside the injector body 1, a cavity can be left between the top side of the magnetic core 21 and the top side of the injector body 1, which forms the first cavity 3. A cavity can also be left between the bottom side of the magnetic core 21 and the bottom side of the injector body 1, which forms the second cavity 4.

[0040] The connecting groove 212 can be a through hole, a through groove, or other structures. The connecting groove 212 can be set eccentrically to the magnetic core 21, and the connecting groove 212 can penetrate the magnetic core 21 along the vertical direction.

[0041] The injector has a first flow path and a second flow path. The first flow path includes a second cavity 4 and a connecting groove 212. The second flow path includes an inner hole 211 and a first cavity 3. The confluence of the first flow path and the second flow path is away from the second cavity 4.

[0042] For example, the first flow path and the second flow path can be a liquid communication channel 212 within the injector for supplying fuel flow. Figure 2 As shown, according to the direction of oil flow, the first flow path can sequentially include the second cavity 4 and the connecting groove 212, and the second flow path can sequentially include the second cavity 4, the inner hole 211, the first cavity 3, etc.

[0043] The confluence can be the intersection of the exit of the first flow path and the exit of the second flow path, specifically as follows: Figure 2 In the area shown at point B, the oil from the two flow paths mixes at this confluence. This confluence is located away from the second cavity 4, meaning there can be a certain distance between the confluence and the second cavity 4.

[0044] When the injector disclosed herein is in use, when the solenoid valve 2 drives the armature 22 to move upward, as the ceramic ball at the bottom of the armature 22 releases the pressure of the armature 22, the oil below flows into the second chamber 4. Then the oil flows along the first flow path and the second flow path, and the oil in the two flow paths mixes at the confluence. Since the confluence is far away from the second chamber 4, interference and influence on the armature 22 in the second chamber 4 are avoided, thus improving the problem of back pressure sensitivity.

[0045] Secondly, since the second flow path is directly connected to the confluence section, and the confluence section is closer to the first cavity 3 than the solutions in related technologies, it facilitates the exhaust of air from the first cavity 3 and avoids the problem of back pressure sensitivity of the armature 22 caused by air stagnation in the first cavity 3, which can easily lead to a mixed environment.

[0046] In some embodiments, the merging portion is located on the side of the magnetic core 21 facing the first cavity 3. For example, as shown in Figure 2, the first cavity 3 can be located on the top side of the magnetic core 21, and the merging portion can be located on the top side of the magnetic core 21. This allows the merging portion to move closer to the first cavity 3, which on the one hand increases the distance between the merging portion and the second cavity 4, thereby reducing interference with the armature 22, and on the other hand facilitates the exhaust of air from the first cavity 3.

[0047] In some embodiments, the connecting groove 212 extends axially through the magnetic core 21, and the confluence portion is located at the port of the connecting groove 212 facing the first cavity 3.

[0048] For example, such as Figure 2 As shown, the connecting groove 212 can extend in the vertical direction, and the confluence portion can be located at the top port of the connecting groove 212. In some other embodiments, the connecting groove 212 can also be arranged at an angle. For example, the connecting groove 212 can extend in the direction from the upper left to the lower right, that is, the connecting groove 212 can connect the confluence portion and the second cavity 4. The shape and extension direction of the connecting groove 212 are not specifically limited.

[0049] In some embodiments, the injector body 1 is provided with a return oil channel 11, and the confluence is located at the intersection of the first flow path, the second flow path and the return oil channel 11, and the confluence is connected to the return oil channel 11.

[0050] For example, such as Figure 2 As shown, the return oil channel 11 can be located inside the inner wall of the injector body 1, and an outlet can be provided on the outer peripheral wall of the injector body 1, which can be connected to the fuel tank. The inlet of the return oil channel 11 can be connected to the confluence section.

[0051] When in use, the oil flowing into the confluence can flow into the oil tank through the return oil channel 11, which facilitates the recycling and reuse of the oil.

[0052] In some embodiments, the magnetic core 21 includes a first body portion 214 and a second body portion 213, wherein the first body portion 214 is located radially between the oil return channel 11 and the second body portion 213.

[0053] For example, such as Figure 2 As shown, the magnetic core 21 can be a columnar structure. The first main body 214 can be the left half of the magnetic core 21, and the second main body 213 can be the right half of the magnetic core 21. The radial direction of the magnetic core 21 can be left-right. The first main body 214 can be located to the right of the upper half of the oil return channel 11, and the second main body 213 can be located to the right of the first main body 214.

[0054] In the axial direction, the length of the first main body portion 214 is less than the length of the second main body portion 213, and a notch is defined between the side of the first main body portion 214 that is shorter than the second main body portion 213 and the second main body portion 213. The notch is located on the side of the first main body portion 214 facing the first cavity 3, and the notch forms a confluence.

[0055] For example, the axial direction can be vertical, and in the vertical direction, the length of the first main body portion 214 can be smaller than the length of the second main body portion 213. The end face of the first main body portion 214 facing the second cavity 4 and the end face of the second main body portion 213 facing the second cavity 4 can be flush, that is, the bottom end face of the first main body portion 214 and the bottom end face of the second main body portion 213 are at the same level.

[0056] At this time, since the first main body portion 214 is shorter than the second main body portion 213, a notch groove can be defined between the top side of the first main body portion 214 and the second main body portion 213. The notch groove is similar to a semi-circular stepped groove.

[0057] The space defined by the notch can be regarded as the aforementioned confluence, which facilitates the formation of the confluence and also helps to improve the compactness of the overall structural layout.

[0058] In some embodiments, the oil return channel 11 includes a first axial section 111 and a second axial section 112, both of which extend axially. The first axial section 111 and the second axial section 112 are located on both sides of the armature 22 in the radial direction, and the first axial section 111 is connected to the confluence portion.

[0059] For example, such as Figure 2 As shown, the first axial segment 111 and the second axial segment 112 can both extend generally in the vertical direction, wherein the first axial segment 111 can be located on the left side of the injector body 1, and the second axial segment 112 can be located on the right side of the injector body 1.

[0060] The first axial section 111 is higher than the second axial section 112, and the top end of the first axial section 111 can be directly connected to the confluence portion. The bottom end of the second axial section 112 can be connected to the outlet on the outer wall of the injector body 1.

[0061] The distribution of different axial sections on different sides of the injector body 1 is beneficial to improving the uniformity of oil distribution and also helps to ensure the relative uniformity of structural distribution.

[0062] In some embodiments, the return oil channel 11 further includes an inclined section 113 and a transverse section 114. The inclined section 113 is arranged at an angle relative to the axial direction. One end of the inclined section 113 is connected to the first axial section 111, one end of the transverse section 114 is connected to the other end of the inclined section 113, and the other end of the transverse section 114 is connected to the second axial section 112.

[0063] For example, such as Figure 2 As shown, the inclined section 113 can be located on the left side of the injector, and the inclined section 113 can be arranged at an angle from the lower left to the upper right. The transverse section 114 can generally extend in the left-right direction. The bottom end of the inclined section 113 can be connected to the bottom end of the first axial section 111, and the top end of the inclined section 113 can be connected to the left end of the transverse section 114. The right end of the transverse section 114 can be connected to the top end of the second axial section 112. The arrangement of the inclined section 113 and the transverse section 114 facilitates the flow of oil from the first axial section 111 to the second axial section 112.

[0064] In some embodiments, the first axial segment 111 and the second axial segment 112 have an overlapping segment 115 in the axial direction, and an oblique segment 113 and a transverse segment 114 are disposed between the overlapping segment 115 of the first axial segment 111 and the second axial segment 112.

[0065] For example, such as Figure 2 As shown, the overlapping segment 115 can be the part of the first axial segment 111 and the second axial segment 112 that overlap in the left and right direction. The overlapping segment 115 of the first axial segment 111 can be located at the bottom of the first axial segment 111, and the overlapping segment 115 of the second axial segment 112 can be located at the top of the second axial segment 112.

[0066] The aforementioned inclined section 113 and transverse section 114 can be located between the overlapping sections 115 of the two axial sections in the left-right direction. Therefore, when the oil flows along the return oil channel 11, it can have a reverse flow along the inclined section 113, which helps to reduce the flow velocity of the oil exiting the outlet. Secondly, this tortuous change also protects the solenoid valve 2, preventing impurities from easily flowing directly to the solenoid valve 2 when flowing in the reverse direction.

[0067] In some embodiments, the magnetic core 21 may be made of a magnetic material (such as ferrite, permalloy, amorphous / nanocrystalline alloy, etc.) and is used to constrain and guide the magnetic field in the circuit. The aforementioned connecting slot 212 may be directly disposed on the magnetic core 21, and the connecting slot 212 may specifically be an opening or a connecting slot 212 on the magnetic core 21.

[0068] In some embodiments, the magnetic core 21 is provided with at least two connecting slots 212, both of which extend along the axial direction and are arranged at intervals in the radial direction of the magnetic core 21. One end of each connecting slot 212 is connected to the second cavity 4, and the other end of each connecting slot 212 is connected to the confluence portion.

[0069] For example, such as Figure 2 As shown, two connecting slots 212 can be provided on the magnetic core 21. Both connecting slots 212 can be provided on the left side of the magnetic core 21 and extend along the vertical direction. The two connecting slots 212 can be arranged at intervals in the horizontal direction.

[0070] The bottom end of each connecting groove 212 is connected to the second cavity 4, and the top end of each connecting groove 212 is connected to the upper confluence. This improves the flow efficiency of oil in the second cavity 4 to the confluence.

[0071] In some embodiments, the second flow path includes an oblique flow path segment 5, which is connected between the confluence and the first cavity 3.

[0072] For example, such as Figure 2 As shown, the inclined flow path 5 can be located at the top of the injector, and the inclined flow path 5 can be arranged at an angle from the lower left to the upper right. The top end of the inclined flow path 5 can be connected to the first cavity 3, and the bottom end of the inclined flow path 5 can be connected to the confluence portion.

[0073] This minimizes the flow distance between the first cavity 3 and the confluence, thus facilitating the flow and discharge of air from the first cavity 3 to the confluence.

[0074] In some embodiments, the injector further includes a first elastic element and a second elastic element, wherein both the first elastic element and the second elastic element can be springs.

[0075] The first elastic element is assembled inside the first cavity 3, and the first elastic element abuts against the armature 22 and the solenoid valve in the axial direction. The bottom end of the first elastic element can abut against the armature 22, and the top end of the first elastic element can abut against the solenoid valve.

[0076] In some other embodiments, the top end of the first elastic member can abut against the inner wall of the top side of the injector body 1, and the bottom end of the first elastic member can abut against the top end of the armature 22. This achieves elastic limiting constraint on the top end of the armature 22.

[0077] The second elastic element is assembled inside the second cavity 4, and the second elastic element abuts axially between the armature 22 and the threaded sleeve 6 or the regulating valve 9. For example, the top end of the second elastic element can abut against the bottom side of the armature 22, and the bottom end of the second elastic element can abut against the regulating valve 9.

[0078] In some other embodiments, the top end of the second elastic member can abut against the bottom side of the armature 22, and the bottom end of the second elastic member can abut against the threaded sleeve 6, thereby achieving elastic limiting constraint on the bottom side of the armature 22.

[0079] The threaded sleeve 6 can be an inverted cap-shaped structure, and the second cavity 4 can be located inside the threaded sleeve 6. A through hole can be provided inside the threaded sleeve 6, and the armature 22 can pass through the through hole of the threaded sleeve 6 and abut against the ceramic ball on the regulating valve 9 on the lower side of the threaded sleeve 6.

[0080] In some embodiments, the magnetic core 21 includes an inner annular portion 215 and an outer annular portion 216, an inner hole 211 is disposed in the inner annular portion 215, and the outer annular portion 216 surrounds the outer peripheral side of the inner annular portion 215. At least one of the inner annular portion 215 and the outer annular portion 216 is provided with a communicating groove 212.

[0081] For example, such as Figure 4As shown, both the inner annular portion 215 and the outer annular portion 216 can be annular, wherein the radial dimension of the inner annular portion 215 can be smaller than the radial dimension of the outer annular portion 216. The inner annular portion 215 and the outer annular portion 216 can be arranged coaxially, wherein the outer annular portion 216 can surround the outer periphery of the inner annular portion 215.

[0082] like Figure 4 As shown, both the inner annular portion 215 and the outer annular portion 216 can be provided with a connecting groove 212, and the connecting grooves 212 on the inner annular portion 215 and the outer annular portion 216 can be arranged opposite to each other in the radial direction. This satisfies the requirement that the medium such as oil at the bottom of the magnetic core 21 flows to the same confluence position through different connecting grooves 212. Secondly, it also facilitates the processing and arrangement of the connecting grooves 212 on the two annular portions.

[0083] In some other embodiments, the communicating groove 212 may be provided only on the inner annular portion 215, and in other embodiments, the communicating groove 212 may be provided only on the outer annular portion 216.

[0084] In some embodiments, the solenoid valve 2 includes a frame 7 and a coil 8, with an assembly groove 217 defined between the inner annular portion 215 and the outer annular portion 216, and both the frame 7 and the coil 8 are assembled in the assembly groove 217.

[0085] For example, such as Figure 4 As shown, an annular mounting groove 217 can be defined between the inner annular portion 215 and the outer annular portion 216, and the opening of the mounting groove 217 can be arranged downwards. Figure 3 As shown, the skeleton 7 can be a circular cylindrical structure. The skeleton 7 can be installed in the assembly groove 217. The coil 8 can be wound around the outer periphery of the skeleton 7. Both the coil 8 and the skeleton 7 can be assembled in the assembly groove 217.

[0086] This facilitates the installation and arrangement of coil 8 and frame 7, and ensures a good constraint and limiting effect on coil 8 and frame 7.

[0087] In some embodiments, the inner annular portion 215 is provided with a communicating groove 212, which extends through the inner annular portion 215 along the axial direction. In the radial direction of the inner annular portion 215, the groove depth of the communicating groove 212 is less than or equal to the thickness of the inner annular portion 215.

[0088] For example, such as Figure 4 As shown, the connecting groove 212 on the inner annular portion 215 can be a first connecting groove 23. There can be only one first connecting groove 23. The first connecting groove 23 can penetrate the inner annular portion 215 in the vertical direction. Specifically, the first connecting groove 23 can be a through groove.

[0089] For example, the depth of the first connecting groove 23 can be M1, and the wall thickness of the inner annular portion 215 can be L1. M1 can be the same as L1, that is, the first connecting groove 23 penetrates the side wall of the inner annular portion 215 in the radial direction.

[0090] In some other embodiments, the first connecting groove 23 may also be a blind groove, that is, the groove depth M1 of the first connecting groove 23 is smaller than the wall thickness L1 of the inner annular portion 215.

[0091] In some embodiments, the outer annular portion 216 is provided with a communicating groove 212, which extends through the outer annular portion 216 along the axial direction. In the radial direction of the outer annular portion 216, the groove depth of the communicating groove 212 is less than or equal to the thickness of the outer annular portion 216.

[0092] For example, such as Figure 4 As shown, the connecting groove 212 on the outer annular portion 216 can be a second connecting groove 24. There can be only one second connecting groove 24. The second connecting groove 24 can penetrate the inner annular portion 215 in the vertical direction. Specifically, the second connecting groove 24 can be a through groove.

[0093] For example, the depth of the second connecting groove 24 can be M2, and the wall thickness of the outer annular portion 216 can be L2. M2 can be the same as L2, that is, the second connecting groove 24 penetrates the side wall of the outer annular portion 216 in the radial direction.

[0094] In some other embodiments, the second connecting groove 24 may also be a blind groove, that is, the groove depth M2 of the second connecting groove 24 is smaller than the wall thickness L2 of the outer annular portion 216.

[0095] In some embodiments, the magnetic core 21 includes a connecting portion 218, which is located at one axial end of the magnetic core 21 and connects between the inner annular portion 215 and the outer annular portion 216.

[0096] For example, such as Figure 6 As shown, the connecting part 218 can be located at the top of the magnetic core 21. The connecting part 218 can be arc-shaped. The inner side of the connecting part 218 can be connected to the inner annular part 215, and the outer side of the connecting part 218 can be connected to the outer annular part 216. The connection part 218 allows the inner annular part 215 and the outer annular part 216 to form a single unit.

[0097] In some embodiments, both the inner annular portion 215 and the outer annular portion 216 are provided with a communicating groove 212, and the connecting portion 218 is provided with a connecting groove 2181. One end of the connecting groove 2181 communicates with the communicating groove 212 on the inner annular portion 215, and the other end of the connecting groove 2181 communicates with the communicating groove 212 on the outer annular portion 216.

[0098] For example, the connecting part 218 can be entirely arc-shaped, and a connecting groove 2181 is formed in the circumferential notch portion of the connecting part 218, such as... Figure 6 As shown, the inner side of the connecting groove 2181 can be connected to the first connecting groove 23, and the outer side of the connecting groove 2181 can be connected to the second connecting groove 24.

[0099] This allows the first connecting groove 23 and the second connecting groove 24 to be connected radially, so that the oil flowing through the two connecting grooves 212 can converge at the connecting groove 2181, thereby facilitating the formation of the aforementioned convergence position and facilitating the convergence of oil from different flow paths at a location far from the armature cavity.

[0100] Secondly, the connection groove 2181 can also increase the path length of the eddy current and reduce the surface eddy current density.

[0101] In some embodiments, the tail portion 222 includes a disc-shaped portion 2221 and a cylindrical portion 222, the radial dimension of the cylindrical portion 222 being smaller than the radial dimension of the disc-shaped portion 2221, the disc-shaped portion 2221 being located axially between the magnetic core 21 and the cylindrical portion 222, and the disc-shaped portion 2221 being provided with a communicating groove 212.

[0102] For example, such as Figure 5 As shown, the disc-shaped portion 2221 can be disc-shaped, and the cylindrical portion 222 can be cylindrical. The disc-shaped portion 2221 and the cylindrical portion 222 can be integrally formed. This allows the tail portion 222 to have a nail-like structure. During assembly, the disc-shaped portion 2221 can be positioned above the cylindrical portion 222.

[0103] like Figure 5 As shown, the disc-shaped portion 2221 may be provided with three third connecting slots 25, which may be arranged at equal intervals along the circumference of the disc-shaped portion 2221. Each third connecting slot 25 may extend along the radial direction of the disc-shaped portion 2221, and the opening of each third connecting slot 25 may be located on the outer peripheral wall of the disc-shaped portion 2221.

[0104] This increases the path length of the eddy currents in armature 22 and reduces the surface eddy current density.

[0105] In some embodiments, the disc-shaped portion 2221 is provided with a plurality of communicating slots 212, which are arranged at circumferential intervals along the disc-shaped portion 2221. For example, as Figure 5 As shown, the disc-shaped portion 2221 may be provided with three third connecting slots 25. In some other embodiments, the disc-shaped portion 2221 may also be provided with one, two, four, five or other numbers of connecting slots 212.

[0106] In some embodiments, the disc-shaped portion 2221 and the cylindrical portion 222 are arranged coaxially, and the outer peripheral edge of the disc-shaped portion 2221 and the outer peripheral edge of the cylindrical portion 222 are separated by a distance L in the radial direction along the tail portion 222. The opening of the connecting groove 212 is located on the outer peripheral wall of the disc-shaped portion 2221, and the groove depth of the connecting groove 212 is less than or equal to the distance L.

[0107] For example, such as Figure 5 As shown, the depth of the third connecting groove 25 can be dimension M, which can be the same as the distance L. In this case, the outer peripheral wall of the cylindrical portion 222 forms the bottom of the third connecting groove 25. In some other embodiments, dimension M can also be smaller than the distance L.

[0108] In some embodiments, the connecting groove 212 of the disc-shaped portion 2221 and the connecting groove 212 on the magnetic core 21 are arranged opposite to each other and connected in the axial direction. For example, the disc-shaped portion 2221 may be located below the magnetic core 21, and in the vertical direction, the third connecting groove 25 on the disc-shaped portion 2221 may be arranged opposite to the first connecting groove 23 and / or the second connecting groove 24 on the magnetic core 21.

[0109] In this way, the oil on the bottom side of the disc-shaped section 2221 can flow into the first connecting groove 23 and / or the second connecting groove 24 through the third connecting groove 25, and then flow into the connecting groove 2181 above through the first connecting groove 23 and / or the second connecting groove 24. This facilitates the return flow of oil in the injector.

[0110] In this disclosure, a connecting groove 212 is provided on the magnetic core 21 and the armature 22. The connection groove 212 can also make the flow path of the induced eddy current longer and the resistance increased, which greatly weakens the eddy current intensity, thereby improving the response speed of the solenoid valve 2 and avoiding the problems of low control accuracy and long time consumption of the needle valve of the fuel injector.

[0111] Secondly, the connection groove 212 can reduce the surface eddy current density of the magnetic core 21, armature 22, etc., thereby reducing local energy loss, which in turn reduces heat release and ultimately reduces the heat generation of the solenoid valve 2, and also improves the problem of severe heat generation of the solenoid valve 2 during operation.

[0112] The engine disclosed herein is described below.

[0113] The engine disclosed herein includes a fuel injector, which may be the fuel injector described in any of the above embodiments. The engine may be a gasoline engine, a diesel engine, or the like.

[0114] The vehicle disclosed herein is described below.

[0115] The vehicles disclosed herein include fuel injectors as described in any of the foregoing embodiments or engines as described in any of the foregoing embodiments. Specifically, the vehicles may be sedans, SUVs, or other similar vehicles, and may also be hybrid or other types of new energy vehicles.

[0116] It should be noted that, in this disclosure, each numerical range, except where it is explicitly stated that it does not include endpoint values, can be either endpoint values ​​or the median of each numerical range. Furthermore, the specific numerical values ​​in this disclosure are not intended to limit the corresponding size parameters in this disclosure, and all allowed values ​​are within the protection scope of this disclosure.

[0117] Although embodiments of the present disclosure have been shown and described, it will be understood by those skilled in the art that variations may be made to these embodiments without departing from the principles and spirit of the present disclosure, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fuel injector, comprising: Injector body; A solenoid valve, which is assembled in the injector body, includes a magnetic core and an armature, and the armature includes a guide portion; The magnetic core has a first cavity at one axial end and a second cavity at the other axial end. The magnetic core has an inner hole and a connecting groove, and the guide portion of the armature is assembled in the inner hole of the magnetic core. In the flow path of the medium, the second cavity communicates with the first cavity at the confluence via the connecting groove, and the confluence is located on the side of the magnetic core closer to the first cavity; A first flow path and a second flow path, wherein the first flow path includes the second cavity and the communicating groove, and the second flow path includes the second cavity, the inner hole and the first cavity; The first flow path and the second flow path converge at the confluence, and the confluence is located away from the second cavity; The connecting groove extends through the magnetic core along the axial direction, and the confluence is located at the port of the connecting groove facing the first cavity; The injector body is provided with a return oil channel, and the confluence is located at the intersection of the first flow path, the second flow path and the return oil channel, and the confluence is connected to the return oil channel; The magnetic core includes: An inner annular portion, wherein the inner hole is disposed within the inner annular portion; An outer annular portion, which surrounds the outer periphery of the inner annular portion; At least one of the inner annular portion and the outer annular portion is provided with the communicating groove.

2. The injector according to claim 1, wherein: The inner annular portion is provided with the communicating groove, which extends through the inner annular portion along the axial direction. In the radial direction of the inner annular portion, the depth of the communicating groove is less than or equal to the thickness of the inner annular portion. And / or, the outer annular portion is provided with the communicating groove, the communicating groove extending through the outer annular portion along the axial direction, and the groove depth dimension of the communicating groove in the radial direction of the outer annular portion is less than or equal to the thickness dimension of the outer annular portion.

3. The injector according to claim 1, wherein: The magnetic core includes a connecting portion located at one axial end of the magnetic core and connected between the inner annular portion and the outer annular portion.

4. The injector according to claim 3, wherein: The inner annular portion is provided with a first connecting groove, the outer annular portion is provided with a second connecting groove, the connecting portion is provided with a connecting groove, one end of the connecting groove is connected to the first connecting groove, the other end of the connecting groove is connected to the second connecting groove, and the connecting groove forms at least part of the confluence portion.

5. The injector according to claim 1, wherein: The armature includes a tail portion located on the side of the magnetic core facing the second cavity and connected to the guide portion. The tail portion is provided with a third connecting groove that extends through the tail portion in the axial direction.

6. The injector according to claim 1, wherein: The oil return channel includes: A first axial segment and a second axial segment, both extending along the axial direction, are located on opposite sides of the armature in the radial direction, and the first axial segment communicates with the confluence portion.

7. The injector according to claim 6, wherein: The oil return channel also includes: An inclined segment, wherein the inclined segment is arranged at an angle relative to the axial direction, and one end of the inclined segment is connected to the first axial segment; The transverse segment has one end connected to the other end of the oblique segment, and the other end of the transverse segment is connected to the second axial segment.

8. The injector according to claim 7, wherein: The first axial segment and the second axial segment have overlapping sections in the axial direction, and the oblique segment and the transverse segment are located between the overlapping sections of the first axial segment and the second axial segment.

9. The injector according to claim 1, wherein: The second flow path includes an oblique flow path segment, which connects the confluence and the first cavity.

10. The injector according to any one of claims 1-9, wherein: Also includes: A first elastic element is assembled in the first cavity, and the first elastic element abuts against the armature and the solenoid valve in the axial direction. The second elastic element is assembled in the second cavity and abuts against the armature and the threaded sleeve or regulating valve in the axial direction.

11. An engine comprising an injector as described in any one of claims 1-10.

12. A vehicle comprising an injector as described in any one of claims 1-10 or comprising an engine as described in claim 11.

Images