A needle valve assembly and an oil injector

Abstract

The utility model belongs to fuel injector technical field discloses a needle valve subassembly and fuel injector, wherein, needle valve subassembly includes valve sleeve, the iron core and armature are equipped in valve sleeve, the end face of armature towards iron core is equipped with first convex part, and first convex part is closed annular, the axial flow channel is equipped in armature, and first convex part surrounds axial flow channel, the utility model discloses through the cooperation of first convex part and the recessed area of first convex part periphery and forms the damping noise reduction, realizes the effective noise reduction of armature impact iron core process, and the noise reduction is reliable, and the cost is low.

Description

Technical Field

[0001] This utility model belongs to the field of fuel injector technology. Background Technology

[0002] Overall vehicle comfort (vibration, noise, etc.) is a major concern for OEMs, with engine noise being one of the primary sources of vehicle noise. As a key component of the engine's fuel supply system, the fuel injector continuously opens and closes its internal moving parts—the needle valve assembly—to deliver fuel to the intake manifold. Due to functional and reliability requirements, the needle valve assembly, along with its mating iron core and valve seat, is made of metal. During the injector's opening and closing process, mechanical collisions between metal components inevitably occur, generating high-frequency noise.

[0003] To reduce the noise generated by fuel injectors, two main noise reduction measures are commonly used: 1. Adding a soundproof enclosure around the fuel injector to block the propagation path of high-frequency vibrations; 2. Reducing the weight of moving parts inside the fuel injector, i.e., reducing the weight of the needle valve assembly, thereby reducing impact force and vibration excitation sources. For measure 1, the added soundproof enclosure increases engine cost, and its design is severely constrained by limited engine space. For measure 2, due to limitations in the basic functions, reliability, and manufacturing processes of the fuel injector, the weight of the needle valve assembly can only be modified to a limited extent, resulting in limited noise reduction benefits from weight reduction. Utility Model Content

[0004] This application provides a needle valve assembly to solve related technical problems.

[0005] This utility model is achieved through the following technical solution:

[0006] A needle valve assembly, characterized in that it comprises:

[0007] Valve sleeve, wherein an iron core and an armature are provided inside the valve sleeve;

[0008] The armature has a first protrusion on its end face facing the iron core, and the first protrusion is a closed ring.

[0009] The armature has an axial flow channel inside, and the first protrusion surrounds the axial flow channel.

[0010] This invention improves the end face of the armature: on the one hand, a specially designed first protrusion impacts the iron core, which, compared to impacting the entire end face, reduces or avoids impacts near the valve sleeve area, thereby reducing amplitude and noise. On the other hand, the recessed area around the first protrusion works in conjunction with the first protrusion to reduce noise: the area around the first protrusion on the armature end face is a recessed area that can store fluid medium (gas or liquid), and the first protrusion surrounds the axial flow channel, which can intercept the fluid medium in the damping area. Thus, at the moment of impact, the fluid medium in the damping area can generate damping force to reduce noise.

[0011] Furthermore, the first protrusion can be a circular ring, an elliptical ring, a square ring, or an irregular ring. The first protrusion can be a closed ring of any shape.

[0012] Furthermore, the first protrusion is a boss formed by extending upward from the inner wall of the axial flow channel. This ensures that the flow rate of the axial flow channel is not significantly affected.

[0013] Furthermore, the end face of the armature facing the iron core is provided with a second protrusion surrounding the first protrusion. The second protrusion is provided close to or along the outer edge of the armature, and the height of the second protrusion is lower than that of the first protrusion.

[0014] Adding a second protrusion can correct the axial misalignment that occurs after the armature strikes the iron core, ensuring the motion stability of the needle valve assembly and the flow stability of the fluid medium.

[0015] Furthermore, the second protrusion is a closed ring. This allows for axial misalignment correction of the armature in any direction.

[0016] Furthermore, the number of the second protrusions is two or more, and they are evenly distributed along the circumference of the armature. This reduces the encroachment of the second protrusions on the damping area, retains more of the damping area, and improves the damping and noise reduction effect.

[0017] Furthermore, the armature is symmetrically provided with flow holes near the valve ball, forming a radial flow channel that communicates with the axial flow channel. The symmetrically designed radial flow channel ensures the vertical stability of the needle valve assembly when fluid medium passes through it.

[0018] This utility model also provides an injector, including the above-described needle valve assembly. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the injector structure in some embodiments of this utility model;

[0021] Figure 2 These are schematic diagrams of the armature structure in some embodiments of this utility model;

[0022] Figure 3 This is a top view of the armature in some embodiments of this utility model;

[0023] Figure 4 This is a top view of the armature in some embodiments of this utility model;

[0024] Figure 5 This is a top view of the armature in some embodiments of this utility model;

[0025] Figure 6 This is a flow diagram of the fluid medium in some embodiments of this utility model;

[0026] Figure 7 These are comparison images of some embodiments of this utility model before and after the second protrusion is provided. Detailed Implementation

[0027] To reduce the noise generated by fuel injectors, existing technologies commonly employ two main noise reduction measures: 1. Adding a soundproof enclosure around the injector to block the propagation path of high-frequency vibrations; 2. Reducing the weight of the internal moving parts of the injector, such as the needle valve assembly, thereby reducing impact force and vibration excitation sources. For measure 1, the added soundproof enclosure increases engine costs, and its design is severely constrained by limited engine space. For measure 2, due to limitations in the injector's basic functions, reliability, and manufacturing processes, the weight of the needle valve assembly can only be modified to a limited extent, resulting in limited noise reduction benefits from weight reduction.

[0028] To reduce noise reduction costs and increase noise reduction benefits, this utility model provides a needle valve assembly. This assembly utilizes a first protrusion and a damping area (a recessed area surrounding the first protrusion) to form damping noise reduction, effectively reducing noise during the armature's impact with the iron core. Since the fuel injector contains a needle valve assembly, this specific embodiment will be described using the fuel injector as an example.

[0029] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] refer to Figure 1 and Figure 2 As shown, an injector includes a needle valve assembly, wherein an electromagnetic coil 6 is sleeved on the needle valve assembly;

[0031] The needle valve assembly includes:

[0032] Valve sleeve 1, wherein an iron core 2 and an armature 3 are axially provided inside the valve sleeve 1, and an axial gap 203 is left between the iron core 2 and the armature 3;

[0033] The armature 3 has a first protrusion 303 on its end face facing the core 2. The first protrusion 303 is a closed ring.

[0034] The armature 3 is provided with an axial flow channel 301, and the first protrusion 303 surrounds the axial flow channel 301.

[0035] The recessed area on the end face of the armature 3, located around the first protrusion 303, is the damping region 305.

[0036] In some embodiments of this specific implementation, the end of the armature 3 away from the iron core 2 is connected to a valve ball 4, and a valve seat 5 is provided inside the valve sleeve 1. The valve seat 5 is provided with an oil injection hole. When the injector is not working, the valve ball 4 is placed in the valve seat under the pressure of the spring and seals the oil injection hole. When the injector is working, the electromagnetic coil 6 is energized, and the iron core 2 generates an electromagnetic force to attract the armature 3. The armature 3 moves toward the iron core 2 and impacts it.

[0037] This specific embodiment improves the end face of the armature 3: On the one hand, a specially designed first protrusion 303 is designed to impact the iron core 2. Compared with impacting the entire end face, this reduces or avoids impacts near the valve sleeve 1 area, thereby reducing amplitude and noise. On the other hand, the damping region 305 surrounding the first protrusion 303 works in conjunction with the first protrusion 303 to reduce noise: the damping region 305 is a recessed area that can store fluid medium (gas or liquid), and the first protrusion 303 surrounds the axial flow channel 301, which can intercept the fluid medium in the damping region 305. Thus, at the moment of impact, the fluid medium in the damping region 305 can generate damping force to reduce noise.

[0038] In some embodiments of this specific implementation, the first protrusion 303 is a circular ring, an elliptical ring, a square ring, or an irregular ring. The first protrusion 303 can be a closed ring of any shape.

[0039] In some embodiments of this specific implementation, the first protrusion 303 is a boss formed by extending upward from the inner wall of the axial flow channel 301. This essentially does not affect the flow rate of the axial flow channel 301.

[0040] In some embodiments of this specific implementation, the end face of the armature 3 facing the core 2 is further provided with a second protrusion 304 surrounding the first protrusion 303. The second protrusion 304 is provided close to or along the outer edge of the armature, and the height of the second protrusion 304 is lower than that of the first protrusion.

[0041] The addition of a second protrusion 304 can correct the axial misalignment that occurs after the armature 3 strikes the iron core 2, ensuring the motion stability of the needle valve assembly and the flow stability of the fluid medium.

[0042] refer to Figure 3 As shown in some embodiments of this specific implementation, the second protrusion 304 is a closed annulus surrounding the first protrusion 303. This allows for axial misalignment correction of the armature 3 in any direction.

[0043] In some embodiments of this specific implementation, a plurality of second protrusions 304 are provided and distributed at intervals around the first protrusion 303. This reduces the encroachment of the second protrusions 304 on the damping region 305, retaining more of the damping region 305 and improving the damping noise reduction effect. The number of second protrusions 304 is set according to actual needs. (See reference...) Figure 4 As shown, it has four second protrusions 304, with adjacent second protrusions 304 at a 90° angle. (Reference) Figure 5 As shown, there are three second protrusions 304, and adjacent second protrusions 304 are at an angle of 120°. The number of second protrusions 304 is set according to actual needs.

[0044] In some embodiments of this specific implementation, reference is made to Figure 2 As shown, the armature 3 is also symmetrically provided with radial flow channels 302 that communicate with the axial flow channel 301.

[0045] The symmetrically designed radial flow channel 302 ensures the vertical stability of the needle valve assembly when fluid media passes through it.

[0046] In some embodiments of this specific implementation, the iron core 2 and the armature 3 are coaxial, and the impact zone protrusion is located in the central region of the armature 3. The first protrusion 303 being located in the central region of the armature 3 maximizes its distance from the valve sleeve 1, thereby further reducing the amplitude.

[0047] refer to Figure 6 As shown, the noise reduction principle of the injector in this specific embodiment is as follows:

[0048] During the opening phase of the needle valve assembly, the iron core 2 generates a magnetic force that attracts the armature 3 to move toward the iron core 2;

[0049] During the movement of the iron core 2, the flow of oil to the main channel 301 is hindered by the interception effect of the first protrusion 303, and the oil in the axial gap 203 between the iron core 2 and the armature 3 is retained in the damping area 305.

[0050] As the axial clearance 203 gradually decreases, the damping force generated by the oil in the damping zone 305 gradually increases.

[0051] When the first protrusion 303 impacts the iron core 2, the first protrusion 303 and the iron core 2 are attracted together, and the damping force of the damping region 305 reaches its maximum, thereby reducing the impact noise through the damping force.

[0052] refer to Figure 7 As shown, after the armature 3 and the iron core 2 collide, the second protrusion 304 can significantly reduce the degree of deviation of the armature axis, thus playing a good corrective role.

[0053] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A needle valve assembly, characterized in that, include: Valve sleeve, wherein an iron core and an armature are provided inside the valve sleeve; The armature has a first protrusion on its end face facing the iron core, and the first protrusion is a closed ring. The armature has an axial flow channel inside, and the first protrusion surrounds the axial flow channel.

2. The needle valve assembly according to claim 1, characterized in that, The first protrusion is a circular ring, an elliptical ring, a square ring, or an irregular ring.

3. The needle valve assembly according to claim 1, characterized in that, The first protrusion is a boss formed by extending upward from the inner wall of the axial flow channel.

4. The needle valve assembly according to claim 1, characterized in that, The end face of the armature facing the iron core is also provided with a second protrusion surrounding the first protrusion. The second protrusion is provided close to or along the outer edge of the armature, and the height of the second protrusion is lower than that of the first protrusion.

5. The needle valve assembly according to claim 4, characterized in that, The second protrusion is a closed ring.

6. The needle valve assembly according to claim 4, characterized in that, The number of the second protrusions is two or more, and they are evenly distributed along the circumferential direction of the armature.

7. The needle valve assembly according to claim 1, characterized in that, The armature is also provided with symmetrical flow holes near the valve ball, forming a radial flow channel that communicates with the axial flow channel.

8. A fuel injector, characterized in that, Includes the needle valve assembly as described in any one of claims 1 to 7.

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