Injector structure and fuel injector having the same

Abstract

The utility model provides a kind of injector structure and fuel injector with it, injector structure includes nozzle body and valve needle, valve needle end has sealing surface, nozzle body is equipped with annular cavity with sealing surface cooperation use, at least part outer wall surface between valve needle and at least part inner wall surface of nozzle body is formed with the accommodation space for accommodating fuel, the end of nozzle body is equipped with accommodating hole, accommodating hole has the sealing inner wall surface with the outer peripheral surface of valve needle contact and the injection inner wall surface with the outer peripheral surface of valve needle between formation has the injection gap for gas fuel injection, injection gap is communicated with annular cavity;Solved the problem in prior art due to round hole injection port causes nozzle diameter is difficult to further reduce, processing cost is high, injection performance consistency is poor and is easy to block etc.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and more specifically, to an injector structure and a fuel injector having the same. Background Technology

[0002] The engine fuel injection system is a key component for the efficient operation of internal combustion engines, especially in diesel engines. As the core component of the fuel injection system, the fuel injector is responsible for delivering atomized fuel into the engine's combustion chamber at the appropriate time and pressure according to a predetermined injection pattern. To meet increasingly stringent environmental regulations and improve engine fuel economy, the design and technology of fuel injectors are constantly advancing to optimize the combustion process and reduce harmful emissions.

[0003] In existing technology, fuel injectors typically include a nozzle body and a valve needle. The front end of the nozzle body is designed with several circular injection slots, the number and size of which are designed to provide the required fuel flow rate at a specific injection pressure. The valve needle moves up and down inside the injector, controlling fuel injection by tightly engaging or disengaging from the edge of the nozzle body's orifice.

[0004] However, existing fuel injectors use circular orifices. Under a given flow rate, the only way to reduce the nozzle diameter is to increase the number of orifices. However, as the number of orifices increases, the manufacturing cost also increases accordingly. Furthermore, the fuel injection pattern changes, and combustion performance may deteriorate. At the same time, the smaller the orifice diameter, the more difficult it is to manufacture, and the less consistent the orifice diameter becomes. Ultimately, this leads to poorer performance consistency of the injector. In addition, if the orifice diameter is too small, combustion products may clog the orifice, resulting in insufficient injection flow. Utility Model Content

[0005] The main objective of this invention is to provide an injector structure and a fuel injector having the same, in order to solve the problems in the prior art such as the difficulty in further reducing the nozzle diameter due to the circular injection orifice, high processing costs, poor consistency of injection performance, and easy clogging.

[0006] To achieve the above objectives, according to one aspect of the present invention, an injector structure is provided for delivering gaseous fuel to an internal combustion engine. The injector structure includes a nozzle body and a valve needle movably disposed within the nozzle body. The valve needle has an annular sealing surface near its end. The nozzle body has an annular cavity near its end that cooperates with the sealing surface. A receiving space for receiving fuel is formed between at least a portion of the outer wall surface of the valve needle and at least a portion of the inner wall surface of the nozzle body. A receiving hole is provided at the end of the nozzle body. The receiving hole has a sealing inner wall surface that contacts the outer peripheral surface of the valve needle and an injection inner wall surface that forms an injection gap for gaseous fuel to be ejected between the sealing surface of the valve needle and the outer peripheral surface of the valve needle. The injection gap communicates with the annular cavity. The valve needle is movably disposed along the gaseous fuel injection direction so that when the sealing surface of the valve needle separates from the annular cavity, the injection gap communicates with the receiving space, allowing gaseous fuel to be ejected from the injection gap; and when the sealing surface of the valve needle abuts against the annular cavity, the injection gap is sealed relative to the receiving space.

[0007] Furthermore, the receiving hole includes multiple circumferentially distributed receiving hole sections and multiple injection grooves, each injection groove being disposed between two adjacent receiving hole sections, and the multiple injection grooves forming an injection gap with the outer wall surface of the valve needle.

[0008] Furthermore, multiple spray channels are set at equal intervals.

[0009] Furthermore, the number of spray slots is at least eight.

[0010] Furthermore, the inner wall surface of each spray groove is an arc-shaped surface, and the two ends of the arc-shaped surface along its trajectory direction are respectively connected to the sides of the two adjacent receiving hole sections of the spray groove.

[0011] Furthermore, the inner wall surface of each spray groove includes a first guide surface, a second guide surface and a third guide surface connected in sequence. The first guide surface and the third guide surface are respectively connected to the sides of two adjacent receiving hole sections of the spray groove, and the second guide surface is an arc-shaped surface.

[0012] Furthermore, the distance between the first guide surface and the third guide surface along the first direction gradually increases from the direction away from the center line of the receiving hole, wherein the first direction is perpendicular to the extension direction of the center line of the receiving hole.

[0013] Furthermore, the inner wall surface of each spray groove includes a fourth guide surface and a fifth guide surface connected in sequence. The fourth guide surface and the fifth guide surface are respectively connected to the side of two adjacent receiving hole sections of the spray groove, and the ends of the fourth guide surface and the fifth guide surface that are far away from the receiving hole section intersect each other.

[0014] Furthermore, each spray channel includes a sixth guide surface, a seventh guide surface, and an eighth guide surface connected in sequence. The sixth guide surface and the eighth guide surface are respectively connected to the sides of two adjacent receiving hole sections of the spray channel. The sixth guide surface and the eighth guide surface are parallel to each other, and the sixth guide surface and the seventh guide surface are perpendicular to each other.

[0015] According to another aspect of the present invention, a fuel injector is provided, including an injector structure, wherein the injector structure is the injector structure described above.

[0016] By applying the technical solution of this utility model, the hole for accommodating the valve needle and the hole for injecting fuel are integrally formed, that is, set by slotting. Compared with the existing technology of directly drilling holes, this method can reduce the space occupied without changing the flow rate of the injection hole, thereby achieving the purpose of reducing the diameter of the injection hole. Furthermore, the setting method of this technical solution is easier to process than drilling, and the consistency of the dimensions after processing is better, thus improving the performance consistency of the fuel injector. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 This diagram shows a schematic of the injector structure in a non-ejection state according to an embodiment of this application.

[0019] Figure 2 A cross-sectional view of the injector structure according to an embodiment of this application in the injection state is shown;

[0020] Figure 3 A schematic diagram of the injector structure according to an embodiment of this application is shown;

[0021] Figure 4 A top view of the nozzle body end of an embodiment of this application is shown.

[0022] The above figures include the following reference numerals:

[0023] 1. Nozzle body; 101. Inner wall surface; 2. Valve needle; 201. Outer wall surface; 3. Receiving space; 4. Receiving hole; 401. Annular groove; 4011. Receiving hole section; 402. Spray groove; 5. Annular cavity. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] The engine fuel injection system is a key component for the efficient operation of internal combustion engines, especially in diesel engines. As the core component of the fuel injection system, the fuel injector is responsible for delivering atomized fuel into the engine's combustion chamber at the appropriate time and pressure according to a predetermined injection pattern. To meet increasingly stringent environmental regulations and improve engine fuel economy, the design and technology of fuel injectors are constantly advancing to optimize the combustion process and reduce harmful emissions.

[0026] In existing technology, fuel injectors typically include a nozzle body and a valve needle. The front end of the nozzle body is designed with several circular injection slots, the number and size of which are designed to provide the required fuel flow rate at a specific injection pressure. The valve needle moves up and down inside the injector, controlling fuel injection by tightly engaging or disengaging from the edge of the nozzle body's orifice.

[0027] However, existing fuel injectors use circular orifices. Under a given flow rate, the only way to reduce the nozzle diameter is to increase the number of orifices. However, as the number of orifices increases, the manufacturing cost also increases accordingly. Furthermore, the fuel injection pattern changes, and combustion performance may deteriorate. At the same time, the smaller the orifice diameter, the more difficult it is to manufacture, and the less consistent the orifice diameter becomes. Ultimately, this leads to poorer performance consistency of the injector. In addition, if the orifice diameter is too small, combustion products may clog the orifice, resulting in insufficient injection flow.

[0028] As mentioned above, the purpose of this application is to provide an injector structure and a fuel injector having the same.

[0029] First, this application provides an injector structure for delivering gaseous fuel to an internal combustion engine. The injector structure includes a nozzle body 1 and a valve needle 2 movably disposed within the nozzle body 1. The valve needle 2 has an annular sealing surface near its end. The nozzle body 1 has an annular cavity 5 near its end that cooperates with the sealing surface. A receiving space 3 for receiving fuel is formed between at least a portion of the outer wall surface 201 of the valve needle 2 and at least a portion of the inner wall surface 101 of the nozzle body 1. A receiving hole 4 is provided at the end of the nozzle body 1. The receiving hole 4 has a sealing inner wall surface that contacts the outer peripheral surface of the valve needle 2 and an injection inner wall surface that forms an injection gap for gaseous fuel to be ejected between the sealing surface of the valve needle 2 and the outer peripheral surface of the valve needle 2. The injection gap communicates with the annular cavity 5. The valve needle 2 is movably disposed along the gaseous fuel injection direction so that when the sealing surface of the valve needle 2 is separated from the annular cavity 5, the injection gap communicates with the receiving space 3, so that gaseous fuel is ejected from the injection gap; and when the sealing surface of the valve needle 2 abuts against the annular cavity 5, the injection gap is sealed relative to the receiving space 3.

[0030] Specifically, such as Figures 1 to 4 As shown, the injector structure provided in this application is used to deliver gaseous fuel to an internal combustion engine. The injector structure includes a nozzle body 1 and a valve needle 2 movably disposed within the nozzle body 1 along its extending direction.

[0031] An annular sealing surface is designed at the end of the valve needle 2, which cooperates with the annular cavity 5 of the nozzle body 1. When the valve needle 2 moves in the gaseous fuel injection direction, the sealing surface separates from the annular cavity 5, and the injection gap communicates with the receiving space 3, thereby opening fuel injection. Conversely, when the sealing surface of the valve needle 2 abuts against the annular cavity 5, the injection gap seals with the receiving space 3, and fuel injection stops. This design ensures precise start and stop of fuel injection, improving engine operating efficiency and fuel economy.

[0032] Fuel passes through the receiving space 3 between the outer wall 201 of the valve needle 2 and the inner wall 101 of the nozzle body 1, and is then sprayed out through the injection gap. Due to the small injection gap, a higher injection pressure can be generated, which helps the fuel atomization, forming finer fuel particles and promoting the mixing of fuel and air in the combustion chamber.

[0033] The interconnected design between the injection gap and the accommodating space 3 makes the fuel flow path more direct during the injection process, reducing the chance of combustion byproducts accumulating inside the injector and lowering the risk of blockage.

[0034] The movement of valve needle 2 directly determines the opening and closing of the injection gap. This direct control method makes the injector's response speed faster and can adapt to changes in engine operating conditions, such as acceleration and deceleration, more quickly.

[0035] Because this design uses a jet gap instead of a traditional nozzle, the end design of the nozzle body can be optimized, reducing the number of nozzles required and thus reducing the nozzle diameter.

[0036] The formation of the injection gap depends on the precise fit between the valve needle 2 and the nozzle body 1. Compared with the traditional multi-orifice design, this design can reduce the dependence on the machining accuracy of the orifices during manufacturing, thus simplifying the manufacturing process of the injector.

[0037] Furthermore, the receiving hole 4 includes multiple circumferentially distributed receiving hole sections 4011 and multiple spray grooves 402. Each spray groove 402 is disposed between two adjacent receiving hole sections 4011, and the multiple spray grooves 402 form a spray gap with the outer wall surface of the valve needle 2.

[0038] Each injection slot 402 forms an independent injection gap with the outer wall of the valve needle 2, allowing multiple injection streams to be generated simultaneously or on demand, thus improving the flexibility of fuel injection.

[0039] The design of multiple independent injection slots 402 reduces the continuous area of ​​the fuel injection port, making it less likely for combustion byproducts to accumulate around the injection port and reducing the risk of clogging. Furthermore, the independent injection slots 402 are easier to clean and maintain, ensuring the long-term performance of the injector.

[0040] By adjusting the number, position, and shape of the injection slots 402, the distribution and atomization characteristics of the injection stream can be affected, thereby optimizing the combustion mode and reducing unburned fuel and harmful emissions.

[0041] The design of multiple independent spray channels 402 simplifies the spray hole machining steps in the injector manufacturing process compared to the existing method of directly opening spray holes, and reduces the reliance on precision machining equipment. Furthermore, this design reduces performance inconsistencies caused by machining errors, improving injector production efficiency and quality control.

[0042] Furthermore, multiple spray slots 402 are arranged at equal intervals.

[0043] Furthermore, the number of spray slots 402 is at least eight.

[0044] Multiple equally spaced injection slots 402 create a more uniform fuel injection distribution within the engine cylinders. This uniformity is achieved by ensuring that fuel is injected from each injection slot at a similar angle and distance, thereby avoiding excessively high or low local fuel concentrations and ensuring thorough and uniform mixing of fuel and air within the combustion chamber.

[0045] Setting at least eight injection slots 402 means increasing the number of fuel injections, which effectively improves the stability of the combustion process. Even if a single injection slot experiences slight blockage or performance degradation, the remaining injection slots can still maintain sufficient injection performance to ensure smooth engine operation.

[0046] Because the number of spray channels 402 has increased and their distribution is more even, the burden on individual spray nozzles is reduced, lowering the risk of clogging. Even if a spray channel becomes contaminated, it will not seriously affect the performance of the entire injector.

[0047] Furthermore, the inner wall surface of each spray groove 402 is an arc-shaped surface, and the two ends of the arc-shaped surface along its trajectory direction are respectively connected to the sides of the two adjacent receiving hole sections 4011 of the spray groove 402.

[0048] Specifically, the inner wall of the arc-shaped injection groove 402 helps to form a more uniform and smoother fuel injection flow. During the injection process, when the fuel comes into contact with the arc-shaped surface, its streamlines can smoothly transition along the curved surface, reducing the generation of turbulence and thus improving the atomization effect.

[0049] The arc-shaped injection groove 402 guides the fuel to be injected at a predetermined injection angle and direction, ensuring that the fuel is accurately delivered to the target position in the combustion chamber. This design helps control the diffusion and concentration of the injection stream, thereby improving combustion efficiency and the stability of power output.

[0050] The smooth, curved surface reduces direct collisions between fuel and the inner wall of the injection slot during injection, lowering the likelihood of metal fatigue and wear. In particular, the smooth transition at both ends of the curved surface avoids severe impacts of fuel at sharp angles, further protecting the structural integrity of the injector and extending its service life.

[0051] Furthermore, the inner wall surface of each spray groove 402 includes a first guide surface, a second guide surface and a third guide surface connected in sequence. The first guide surface and the third guide surface are respectively connected to the sides of two adjacent receiving hole sections 4011 of the spray groove 402, and the second guide surface is an arc-shaped surface.

[0052] Furthermore, the distance between the first guide surface and the third guide surface along the first direction gradually increases from the direction away from the center line of the receiving hole 4, wherein the first direction is perpendicular to the extension direction of the center line of the receiving hole 4.

[0053] Specifically, the inner wall of each injection slot 402 can be fan-shaped, that is, the inner wall of the injection slot 402 includes a first guide surface, a second guide surface and a third guide surface connected in sequence. As the distance between the first guide surface and the third guide surface gradually increases, the resistance encountered by the fuel in the process of passing through the injection slot 402 gradually decreases, which helps to reduce the pressure loss inside the fuel injector.

[0054] The design of the fan-shaped guide surface, especially the arc transition of the second guide surface, makes the fuel injection process faster and smoother. When the valve needle 2 opens the injection slot 402, the fuel can pass through the fan-shaped injection slot more quickly.

[0055] Furthermore, the inner wall surface of each spray groove 402 includes a fourth guide surface and a fifth guide surface connected in sequence. The fourth guide surface and the fifth guide surface are respectively connected to the sides of two adjacent receiving hole sections 4011 of the spray groove 402. The ends of the fourth guide surface and the fifth guide surface that are far away from the receiving hole section 4011 intersect each other.

[0056] Specifically, the inner wall of the spray groove 402 can also be triangular in shape.

[0057] The triangular cross-section of the injection groove 402, especially the guiding effect of the fourth and fifth guide surfaces, accelerates the fuel flow rate and promotes fuel atomization through fuel collision and mixing at the intersection point. By precisely controlling the fuel injection pattern and range, the triangular injection groove 402 helps optimize the heat energy distribution in the combustion chamber, avoids local overheating, improves combustion efficiency, and helps reduce the heat load of the combustion chamber.

[0058] Furthermore, each spray groove 402 includes a sixth guide surface, a seventh guide surface, and an eighth guide surface connected in sequence. The sixth guide surface and the eighth guide surface are respectively connected to the sides of two adjacent receiving hole sections 4011 of the spray groove 402. The sixth guide surface and the eighth guide surface are parallel to each other, and the sixth guide surface and the seventh guide surface are perpendicular to each other.

[0059] Specifically, the inner wall of the spray groove 402 can also be square. When the inner wall of the spray groove 402 is square, the spray groove 402 includes a sixth guide surface, a seventh guide surface and an eighth guide surface connected in sequence.

[0060] The square spray groove 402 design, especially the parallel arrangement of the sixth and eighth guide surfaces and the vertical connection between the sixth and seventh guide surfaces, provides more stable structural support. The walls of this shape can withstand higher spray pressures, reducing the risk of deformation of the spray groove 402 during spraying.

[0061] The four-sided design of the square injection slot 402, especially the parallel arrangement of the sixth and eighth guide surfaces, and the seventh guide surface perpendicular to them, can guide fuel to be injected along a specific path and angle, reducing the disorder of fuel injection. With this design, the direction and range of fuel injection are more controllable, which helps to improve combustion performance.

[0062] Embodiments of this application also provide a fuel injector, including an injector structure, which is the injector structure described above.

[0063] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0064] In existing technologies, injection holes are all individually drilled. Increasing the number of injection holes increases processing costs and alters the fuel injection pattern, potentially worsening combustion performance. Furthermore, smaller injection hole diameters increase processing difficulty and reduce the consistency of injection hole diameters, impacting injector performance consistency. Additionally, excessively small injection hole diameters can lead to combustion products clogging the holes and insufficient injection flow. To address these issues, this application employs an integrated molding design, combining the hole for accommodating the valve needle 2 with the injection hole itself—the accommodating hole 4 in this solution. This design reduces space usage without altering the injection hole flow rate, thus achieving a smaller injection hole diameter. Moreover, this design is less complex to manufacture than drilling, resulting in better dimensional consistency and improved fuel injector performance consistency.

[0065] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0066] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0067] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" 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 utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0068] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0069] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0070] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An injector structure for delivering gaseous fuel to an internal combustion engine, the injector structure comprising a nozzle body (1) and a valve needle (2) movably disposed within the nozzle body (1), the valve needle (2) having an annular sealing surface near its end, the nozzle body (1) having an annular cavity (5) near its end that cooperates with the sealing surface, and a receiving space (3) for receiving fuel being formed between at least a portion of the outer wall surface (201) of the valve needle (2) and at least a portion of the inner wall surface (101) of the nozzle body (1), characterized in that, The nozzle body (1) has a receiving hole (4) at its end. The receiving hole (4) has a sealing inner wall surface that contacts the outer peripheral surface of the valve needle (2) and an injection inner wall surface that forms an injection gap between the valve needle (2) and the outer peripheral surface of the valve needle (2) for the gas fuel to be ejected. The injection gap is connected to the annular cavity (5). The valve needle (2) is movably arranged along the gas fuel injection direction so that when the sealing surface of the valve needle (2) is separated from the annular cavity (5), the injection gap is connected to the receiving space (3) so that the gas fuel is ejected from the injection gap. When the sealing surface of the valve needle (2) abuts against the annular cavity (5), the injection gap is sealed relative to the receiving space (3).

2. The injector structure according to claim 1, characterized in that, The receiving hole (4) includes multiple circumferentially distributed receiving hole sections (4011) and multiple spray grooves (402). Each of the spray grooves (402) is disposed between two adjacent receiving hole sections (4011), and the multiple spray grooves (402) form the spray gap with the outer wall surface of the valve needle (2).

3. The injector structure according to claim 2, characterized in that, Multiple spray grooves (402) are arranged at equal intervals.

4. The injector structure according to claim 2, characterized in that, The number of spray slots (402) is at least eight.

5. The injector structure according to claim 2, characterized in that, The inner wall surface of each of the spray grooves (402) is an arc-shaped surface, and the two ends of the arc-shaped surface along its trajectory direction are respectively connected to the sides of the two adjacent receiving hole sections (4011) of the spray groove (402).

6. The injector structure according to claim 2, characterized in that, The inner wall surface of each of the spray grooves (402) includes a first guide surface, a second guide surface and a third guide surface connected in sequence. The first guide surface and the third guide surface are respectively connected to the side of the two adjacent receiving hole sections (4011) of the spray groove (402). The second guide surface is an arc-shaped surface.

7. The injector structure according to claim 6, characterized in that, The distance between the first guide surface and the third guide surface along the first direction gradually increases from the direction away from the center line of the receiving hole (4), wherein the first direction is perpendicular to the extension direction of the center line of the receiving hole (4).

8. The injector structure according to claim 2, characterized in that, Each of the spray grooves (402) has an inner wall surface including a fourth guide surface and a fifth guide surface connected in sequence. The fourth guide surface and the fifth guide surface are respectively connected to the side of the two adjacent receiving hole sections (4011) of the spray groove (402). The fourth guide surface and the fifth guide surface are intersecting at the ends of the receiving hole sections (4011) that are relatively away from each other.

9. The injector structure according to claim 2, characterized in that, Each of the spray grooves (402) includes a sixth guide surface, a seventh guide surface and an eighth guide surface connected in sequence. The sixth guide surface and the eighth guide surface are respectively connected to the sides of two adjacent receiving hole sections (4011) of the spray groove (402). The sixth guide surface and the eighth guide surface are parallel to each other, and the sixth guide surface and the seventh guide surface are perpendicular to each other.

10. A fuel injector, comprising an injector structure, characterized in that, The injector structure is the injector structure according to any one of claims 1 to 9.

Images