Injector-integrated solenoid valve and injector

Abstract

This invention provides a fuel injector-integrated solenoid valve and a fuel injector. The fuel injector-integrated solenoid valve includes an electromagnet and an armature. The electromagnet is embedded in the receiving cavity of the fuel injector body. The armature is located below the electromagnet, forming a movable space between the electromagnet and the armature. The electromagnet has a first connecting channel communicating with the movable space, and the armature has a second connecting channel communicating with the movable space on one side. The first and second connecting channels are respectively connected to the connecting holes of the low-pressure flow path of the fuel injector body. In the above-mentioned fuel injector-integrated solenoid valve, the first and second connecting channels are provided on both sides of the movable space between the electromagnet and the armature, thereby balancing the pressure on both sides of the armature during operation, ensuring that the armature is always under the same pressure during movement, and enhancing the stability of the movement process.

Description

Technical Field

[0001] This invention relates to the field of fuel injector technology, and more specifically to a fuel injector with a built-in solenoid valve and a fuel injector. Background Technology

[0002] The high-speed solenoid valve of the fuel injector is the core control component of the fuel injection system. Its dynamic response characteristics directly affect the precise control of injection timing, cyclic injection quantity, and injection pattern.

[0003] A solenoid valve mainly consists of components such as an electromagnet, an armature, and a spring. The working principle of a solenoid valve is that the electromagnet generates an attractive force under the action of a driving current, overcoming resistance such as hydraulic pressure to control the movement of the armature, thereby changing the direction of liquid flow. The liquid pressure inside the solenoid valve chamber, in turn, exerts a certain force on the movement of the armature, affecting its action. The entire working process involves the coupling of four fields: electricity, magnetism, mechanics, and hydraulics.

[0004] Specifically, during the actual operation of the solenoid valve, the electromagnet attracts the armature to move. The armature is located in a chamber filled with fuel. During the opening process, the fuel above the armature, in a non-flowing state, will generate strong resistance to the armature plate; while during the release process, it will generate strong attraction force on the armature. The entire process will affect the movement of the solenoid valve, causing the movement of the solenoid valve to be unstable.

[0005] Meanwhile, the solenoid valve generates a lot of heat during continuous high-frequency operation. When it is in a high-temperature fuel environment for a long time, the performance characteristics and lifespan of the solenoid valve will be severely degraded.

[0006] Based on this, the inventors of this application propose an injector-embedded solenoid valve and an injector to solve the above-mentioned technical problems. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the defects of the prior art in which the operation of the solenoid valve is obstructed and its performance characteristics and lifespan are affected by the high temperature fuel environment, and to provide a fuel injector built-in solenoid valve and fuel injector.

[0008] The present invention solves the above-mentioned technical problems through the following technical solution:

[0009] This invention provides a fuel injector-embedded solenoid valve, characterized in that it includes:

[0010] An electromagnet is embedded in the housing cavity of the fuel injector body;

[0011] An armature is disposed below the electromagnet, and a movable space is formed between the electromagnet and the armature; wherein...

[0012] The electromagnet is provided with a first connection channel that communicates with the movable space, and the armature is provided with a second connection channel that communicates with the movable space. The first connection channel and the second connection channel are respectively connected to the communication hole of the low-pressure flow path of the injector body.

[0013] According to one embodiment of the present invention, the electromagnet has a mounting hole along the axial direction, and an elastic element is installed in the mounting hole with one end abutting against the armature;

[0014] The electromagnet has a coil wound inside, and when the electromagnet is energized, the armature moves in the movable space.

[0015] According to one embodiment of the present invention, the electromagnet is provided with at least one guide hole communicating with the mounting hole, and one end of the guide hole is connected to the communicating hole.

[0016] According to one embodiment of the present invention, the number of guide holes is at least two, and the at least two guide holes are arranged at intervals along the circumferential direction of the injector.

[0017] According to one embodiment of the present invention, the electromagnet is further provided with a gasket in the mounting hole, and one end of the elastic member abuts against the gasket;

[0018] An oil passage hole is formed in the middle of the gasket, and one end of the oil passage hole is connected to the guide hole; wherein...

[0019] The mounting hole, the oil passage hole, and the guide hole constitute the first connection channel.

[0020] According to one embodiment of the present invention, two sealing rings are provided along the axial direction of the electromagnet and on opposite sides of the guide hole, with one end of the sealing ring abutting against the inner wall of the accommodating cavity.

[0021] According to one embodiment of the present invention, a guide body is further provided below the electromagnet, and the top surface of the guide body abuts against the bottom surface of the injector body;

[0022] The guide body has a guide hole, and one end of the armature is inserted into the guide hole;

[0023] The guide body is provided with a third connecting channel connected to the connecting hole, and the armature is provided with at least one penetrating channel that connects the movable space and the third connecting channel respectively.

[0024] According to one embodiment of the present invention, the penetrating channel includes a drainage groove in the middle of the armature, at least two guide grooves arranged circumferentially around the drainage groove, and a penetrating hole communicating with the guide groove, the penetrating hole communicating with the third connecting channel;

[0025] One end of the elastic element is engaged in the drainage groove or abuts against the top surface of the armature on the periphery of the drainage groove.

[0026] According to one embodiment of the present invention, at least two of the guide grooves are arranged at uniform intervals around the circumference of the drainage groove.

[0027] According to one embodiment of the present invention, the top of the guide body is provided with a receiving groove, and the through hole is connected to the receiving groove;

[0028] The guide body is also provided with at least one through hole, one end of which is connected to the receiving groove;

[0029] The guide body is also provided with a collecting groove and an oblique hole communicating with the collecting groove at the other end of the through hole, and one end of the oblique hole is connected to the through hole.

[0030] The receiving groove, the through hole, the collecting groove, and the oblique hole constitute the third connecting channel;

[0031] The third connecting channel and the penetrating channel together form the second connecting channel.

[0032] According to one embodiment of the present invention, the top of the electromagnet is further provided with a pressure sleeve and a pad, the pressure sleeve is sleeved on the outside of the electromagnet, one end of the pad abuts against the bottom of the accommodating cavity, and the other end abuts against the pressure sleeve.

[0033] The present invention also provides a fuel injector, characterized in that it comprises:

[0034] The injector body has a connecting hole that communicates with the low-pressure flow path;

[0035] As described above, the injector-embedded solenoid valve has its first and second connection channels connected to the connecting hole, respectively.

[0036] The positive and progressive effects of this invention are as follows:

[0037] The present invention relates to a fuel injector with a built-in solenoid valve. A first connecting channel and a second connecting channel are provided on both sides of the movable space between the electromagnet and the armature. This can balance the pressure on the upper and lower sides of the armature during operation, so that the armature is always under the same pressure during the movement, thereby enhancing the stability of the movement process.

[0038] Furthermore, the first and second connecting channels are connected to the connecting hole of the low-pressure flow path, which enables the circulation of the medium inside and outside the electromagnet. This allows the heat in the electromagnetic coil under high temperature conditions to be released, effectively dissipating its own heat to the outside through the connecting hole, thereby improving the service life and operational reliability of the solenoid valve. Attached Figure Description

[0039] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0040] Figure 1 This is a partial structural cross-sectional view of the fuel injector of the present invention;

[0041] Figure 2 This is a cross-sectional view of the electromagnet of the present invention from one angle;

[0042] Figure 3 This is a partial structural schematic diagram of the electromagnet of the present invention;

[0043] Figure 4 This is a schematic diagram of the armature structure of the present invention.

[0044] 1. Electromagnet; 11. Movable space; 12. First connection channel; 13. Second connection channel; 14. Mounting hole; 15. Guide hole; 16. Gasket; 161. Oil passage hole;

[0045] 2. Injector body; 21. Receiving cavity; 22. Connecting hole;

[0046] 3. Armature; 31. Penetrating channel; 32. Drainage groove; 33. Guide groove; 34. Penetrating hole;

[0047] 4. Elastic components;

[0048] 5. Coil;

[0049] 6. Sealing ring;

[0050] 7. Guide body; 71. Guide hole; 72. Third connecting channel; 73. Receiving groove; 74. Through hole; 75. Collection groove; 76. Angled hole;

[0051] 8. Pressure sleeve;

[0052] 9. Spacer blocks. Detailed Implementation

[0053] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0055] Please refer to Figures 1 to 4 The present invention proposes an injector built-in solenoid valve, including an electromagnet 1 and an armature 3. The electromagnet 1 is embedded in the receiving cavity 21 of the injector body 2; the armature 3 is located below the electromagnet 1, and an active space 11 is formed between the electromagnet 1 and the armature 3.

[0056] The electromagnet 1 is provided with a first connecting channel 12 that is connected to the movable space 11, and the armature 3 is provided with a second connecting channel 13 that is connected to the movable space 11. The first connecting channel 12 and the second connecting channel 13 are respectively connected to the connecting hole 22 of the low-pressure flow path of the injector body 2.

[0057] During the actual operation of the solenoid valve, the electromagnet 1 attracts the armature 3 to move. The armature 3 is in a chamber filled with fuel. During the opening process, the fuel above the armature 3 is not in a flowing state and will generate resistance to the armature 3 disc. During the release process, the fuel will generate a strong attraction force on the armature 3, which will affect the movement of the solenoid valve.

[0058] Based on this, the present invention provides a first connecting channel 12 and a second connecting channel 13 on both sides of the movable space 11 between the armature 3 and the electromagnet 1. The first connecting channel 12 and the second connecting channel 13 are respectively connected to the connecting hole 22 of the low-pressure flow path of the injector body 2, thereby balancing the upper and lower parts of the armature 3 to always be under the same pressure during the movement, making the movement stability of the solenoid valve stronger.

[0059] Furthermore, the solenoid valve is connected to the outside, which allows the liquid medium inside and outside the electromagnet 1 to circulate. This is beneficial for the heat dissipation of the coil 5 of the electromagnet 1 in a high-temperature environment. In this way, the heat generated by the solenoid valve can be effectively released to the outside through the connecting hole 22, which helps to improve the service life and operational reliability of the solenoid valve.

[0060] Please continue to refer to Figure 1 The electromagnet 1 has a mounting hole 14 along the axial direction. The elastic element 4 is installed in the mounting hole 14 and one end abuts against the armature 3. The electromagnet 1 has a coil 5 wound inside. When the electromagnet 1 is energized, the armature 3 moves in the movable space 11.

[0061] Electromagnet 1 is an electromagnetic generating device. Coil 5 is wound inside electromagnet 1. Mounting hole 14 is used to limit the elastic element 4 and guide the elastic element 4 during elastic compression or release. The elastic element 4 is illustrated using a spring as an example, but other feasible elastic structures can also be used, and the specific form is not limited here.

[0062] Please refer to Figure 2 and Figure 3 The electromagnet 1 has at least one guide hole 15 that communicates with the mounting hole 14, and one end of the guide hole 15 is connected to the connecting hole 22.

[0063] To facilitate the opening, the guide hole 15 can be opened radially along the electromagnet 1, for example, the guide hole 15 can be opened from the outside to the inside, and one end of the guide hole 15 extends to communicate with the mounting hole 14. In order to avoid damage to the structure of the elastic element 4 caused by the opening, a stepped hole can be opened at the top of the mounting hole 14, that is, there is also a hole at the top of the gasket 16 (see below), and the height of the hole is the same as the height of the guide hole 15.

[0064] Furthermore, the number of guide holes 15 is at least two, and the at least two guide holes 15 are arranged at intervals along the circumferential direction of the injector.

[0065] For example, refer to Figure 3 The number of guide holes 15 is described here as three. In some other embodiments, the number of guide holes 15 may be one, two, four, etc., and the specific number is not limited here.

[0066] Please continue to refer to Figure 1 The electromagnet 1 is also provided with a gasket 16 in the mounting hole 14, and one end of the elastic element 4 abuts against the gasket 16; an oil passage hole 161 is opened in the middle of the gasket 16, and one end of the oil passage hole 161 is connected to the guide hole 15; wherein, the mounting hole 14, the oil passage hole 161 and the guide hole 15 form the first connection channel 12.

[0067] The gasket 16 is used to support the end of the elastic member 4. The material and thickness of the gasket 16 are not limited here. The diameter of the oil hole 161 in the middle of the gasket 16 is at least smaller than the inner diameter of the elastic member 4, so as to prevent the elastic member 4 from extending upward through the oil hole 161.

[0068] Furthermore, two sealing rings 6 are provided along the axis of the electromagnet 1 and on opposite sides of the guide hole 15, with one end of the sealing ring 6 abutting against the inner wall of the accommodating cavity 21.

[0069] An annular groove for mounting a sealing ring 6 can be formed on the outer circumference of the electromagnet 1. One end of the sealing ring 6 is mounted in the groove, and the other end abuts against the inner wall of the receiving cavity 21 to axially seal the installation gap between the electromagnet 1 and the injector body 2.

[0070] Please refer to Figure 1 and Figure 4 Below the electromagnet 1, there is a guide body 7, the top surface of which abuts against the bottom surface of the injector body 2; a guide hole 71 is provided on the guide body 7, and one end of the armature 3 is inserted into the guide hole 71; a third connecting channel 72 connected to the connecting hole 22 is provided inside the guide body 7, and at least one penetrating channel 31 is provided on the armature 3, which respectively connects the movable space 11 and the third connecting channel 72.

[0071] The armature 3 has a mating part and a mounting part. The mounting part is embedded in the guide hole 71, and the mating part extends toward the electromagnet 1.

[0072] Specifically, the penetration channel 31 includes a flow channel 32 in the middle of the armature 3, at least two guide channels 33 arranged circumferentially around the flow channel 32, and a penetration hole 34 connected to the guide channel 33. The penetration hole 34 is connected to the third connecting channel 72. One end of the elastic member 4 is engaged in the flow channel 32 or abuts against the top surface of the armature 3 on the side of the flow channel 32.

[0073] The drainage groove 32 has a circular cross-sectional shape along its axial direction. The size of the drainage groove 32 is smaller than or corresponds to the size of the elastic member 4. Thus, one end of the elastic member 4 can abut against or be locked in the drainage groove 32 on the top surface of the armature 3 around the drainage groove 32. Multiple through holes 34 are opened on one side of the drainage groove 32, and the drainage groove 32 and the through holes 34 are connected by a guide groove 33.

[0074] The number of guide grooves 33 and through holes 34 are one-to-one and there are at least two. At least two guide grooves 33 are evenly spaced around the circumference of the drainage groove 32.

[0075] Furthermore, the top of the guide body 7 is provided with a receiving groove 73, and the penetrating hole 34 is connected to the receiving groove 73. The guide body 7 is also provided with at least one through hole 74, one end of which is connected to the receiving groove 73; the guide body 7 is also provided with a collecting groove 75 and an inclined hole 76 connected to the collecting groove 75 at the other end of the through hole 74, one end of which is connected to the connecting hole 22; the receiving groove 73, the through hole 74, the collecting groove 75 and the inclined hole 76 form a third connecting channel 72; the third connecting channel 72 and the penetrating channel 31 form a second connecting channel 13.

[0076] It can be seen that the connecting hole 22 of the injector body 2 is opened along the axial direction of the injector body 2, and the oblique hole 76 can be opened from the top of the guide body 7 toward the collecting groove 75 and extend to communicate with the collecting groove 75.

[0077] The through hole 74 is opened along the axial direction of the guide body 7 and communicates with the collection groove 75. The number of through holes 74 can be two, three or more, and is not limited here.

[0078] The axial direction of the inclined hole 76 is set at an angle to the axial direction of the electromagnet 1. The number of inclined holes 76 can be one, two or more, and is not limited here.

[0079] In one embodiment, the top of the electromagnet 1 is also provided with a pressure sleeve 8 and a pad 9. The pressure sleeve 8 is sleeved on the outside of the electromagnet 1, and one end of the pad 9 abuts against the bottom of the accommodating cavity 21, while the other end abuts against the pressure sleeve 8.

[0080] The top of the pad 9 abuts against the injector body 2 and bears a certain amount of pressure.

[0081] The working process of a solenoid valve is described below:

[0082] Under the influence of the driving current, the electromagnet 1 attracts the armature 3, which overcomes the resistance of the elastic element 4 and moves upward. During the upward movement, the armature 3 compresses the fuel inside the electromagnet 1 within the movable space 11, causing it to move upward. At this time, the fuel flows sequentially through the mounting hole 14, the oil passage hole 161, and the guide hole 15 to the connecting hole 22. In the space below the electromagnet 1, the fuel connects to the connecting hole 22 through the penetrating channel 31 of the guide body 7, the through hole 74, and the oblique hole 76, thus achieving pressure balance.

[0083] During operation, the fuel carries away heat through the internal chamber of the electromagnet 1, realizing the circulation of the liquid medium inside and outside the electromagnet 1. This allows the heat dissipation of the electromagnet 1, which is in a high-temperature environment for a long time, to be released. The heat generated by the electromagnet is effectively released through the connecting hole 22, improving the life and reliability of the solenoid valve.

[0084] The present invention also proposes an injector, including an injector body 2 and the above-mentioned injector built-in solenoid valve, wherein the first connection channel 12 and the second connection channel 13 of the injector built-in solenoid valve are respectively connected to the connecting hole 22.

[0085] The solenoid valve in the injector is provided with a first connecting channel 12 and a second connecting channel 13, and the first connecting channel 12 and the second connecting channel 13 are connected to the connecting hole 22 of the low-pressure flow path of the injector body 2, thereby balancing the pressure on both sides of the active space 11, so that the upper and lower parts of the armature 3 are always under the same pressure during the movement, and the operation stability is stronger.

[0086] Moreover, the liquid medium inside and outside the electromagnet 1 can circulate, which solves the heat dissipation problem of the coil 5 of the electromagnet 1 in high-temperature environments, effectively releasing its own heat to the outside through the connecting hole 22, thereby improving the service life and operational reliability of the solenoid valve.

[0087] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "joining", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can also refer to mechanical connections. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0088] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0089] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A fuel injector-embedded solenoid valve, characterized in that, include: An electromagnet is embedded in the housing cavity of the fuel injector body; An armature is disposed below the electromagnet, and a movable space is formed between the electromagnet and the armature; wherein... The electromagnet is provided with a first connection channel that communicates with the movable space, and the armature is provided with a second connection channel that communicates with the movable space. The first connection channel and the second connection channel are respectively connected to the communication hole of the low-pressure flow path of the injector body. The electromagnet has a mounting hole along the axial direction, and the elastic element is installed in the mounting hole with one end abutting against the armature. A guide body is also provided below the electromagnet, and the top surface of the guide body abuts against the bottom surface of the injector body; The guide body has a guide hole, and one end of the armature is inserted into the guide hole; The guide body is provided with a third connecting channel connected to the communicating hole, and the armature is provided with at least one penetrating channel that connects the movable space and the third connecting channel respectively; The penetration channel includes a flow-guiding groove in the middle of the armature, at least two guide grooves arranged circumferentially around the flow-guiding groove, and a penetration hole connected to the guide groove, wherein the penetration hole is connected to the third connecting channel; One end of the elastic element is engaged in the drainage groove or abuts against the top surface of the armature on the periphery of the drainage groove; The guide body has a receiving groove at its top, and the through hole is connected to the receiving groove; The guide body is also provided with at least one through hole, one end of which is connected to the receiving groove; The guide body is also provided with a collecting groove and an oblique hole communicating with the collecting groove at the other end of the through hole, and one end of the oblique hole is connected to the through hole. The receiving groove, the through hole, the collecting groove, and the oblique hole constitute the third connecting channel; The third connecting channel and the penetrating channel together form the second connecting channel.

2. The injector-embedded solenoid valve according to claim 1, characterized in that, The electromagnet has a coil wound inside, and when the electromagnet is energized, the armature moves in the movable space.

3. The injector-embedded solenoid valve according to claim 2, characterized in that, The electromagnet has at least one guide hole that communicates with the mounting hole, and one end of the guide hole is connected to the communicating hole.

4. The injector-embedded solenoid valve according to claim 3, characterized in that, The number of guide holes is at least two, and the at least two guide holes are arranged at intervals along the circumference of the injector.

5. The injector-embedded solenoid valve according to claim 3, characterized in that, The electromagnet is also provided with a gasket in the mounting hole, and one end of the elastic element abuts against the gasket; An oil passage hole is formed in the middle of the gasket, and one end of the oil passage hole is connected to the guide hole; wherein... The mounting hole, the oil passage hole, and the guide hole constitute the first connection channel.

6. The injector-embedded solenoid valve according to claim 3, characterized in that, Two sealing rings are also provided along the axial direction of the electromagnet and on opposite sides of the guide hole, with one end of the sealing ring abutting against the inner wall of the accommodating cavity.

7. The injector-embedded solenoid valve according to claim 1, characterized in that, At least two of the guide grooves are arranged at even intervals around the circumference of the drainage groove.

8. The injector-embedded solenoid valve according to claim 1, characterized in that, The top of the electromagnet is also provided with a pressure sleeve and a pad. The pressure sleeve is fitted on the outside of the electromagnet, and one end of the pad abuts against the bottom of the accommodating cavity, while the other end presses against the pressure sleeve.

9. A fuel injector, characterized in that, include: The injector body has a connecting hole that communicates with the low-pressure flow path; The injector-embedded solenoid valve as described in any one of claims 1-8, wherein the first connection channel and the second connection channel of the injector-embedded solenoid valve are respectively connected to the connecting hole.

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