Oil injector, engine and mechanical device

Abstract

This application relates to a fuel injector, engine, and mechanical device in the field of engine technology. The fuel injector includes an injector body, a needle valve body disposed at one end of the injector body, a needle valve disposed within the needle valve body, and a nozzle cap for connecting the needle valve body to the injector body. The nozzle cap is fitted onto the needle valve body, and an annular cavity is formed between the inner surface of the nozzle cap and the outer surface of the needle valve body. The annular cavity is located at the end of the nozzle cap away from the injector body. A suitable sealing gasket is placed within the annular cavity, and an interference gasket is fitted onto the needle valve body near the sealing gasket. The fuel injector of this application can reduce the possibility of combustion products entering the injector shoulder, improve the protection of the injector shoulder, and extend the service life of the injector.

Description

Technical Field

[0001] This application relates to the field of engine technology, and in particular to an injector, engine and mechanical device. Background Technology

[0002] A fuel injector is a device in an engine used to inject fuel. The working principle of a fuel injector is to atomize fuel into tiny particles using pressure or other methods to ensure thorough mixing with air and improve combustion efficiency. The fuel injector body and needle valve body are connected by a nozzle cap. Because some fuels contain corrosive elements, these elements can easily enter between the nozzle cap and the needle valve body, causing cracks in the injector shoulder (the nozzle cap is located at one end of the needle valve body). Therefore, an interference fit is currently installed on the injector needle valve body. This interference fit isolates the injector shoulder from combustion products, preventing combustion gases from entering between the nozzle cap and the needle valve body, thus protecting the injector shoulder. However, after prolonged engine operation, the interference fit of the gasket gradually decreases. When the interference fit is insufficient, combustion products can easily enter the injector shoulder, leading to a decrease in the injector's protective performance, causing the injector shoulder to crack and making the injector more susceptible to damage. Utility Model Content

[0003] In view of the problems existing in the background art, this application provides an injector, engine and mechanical device, which can reduce the possibility of combustion products entering the injector shoulder, improve the protection of the injector shoulder and extend the service life of the injector.

[0004] According to a first aspect of the present invention, an injector is provided, comprising an injector body, a needle valve body disposed at one end of the injector body, a needle valve disposed within the needle valve body, and a nozzle cap for connecting the needle valve body to the injector body; wherein the nozzle cap is fitted onto the needle valve body, and an annular cavity is formed between the inner surface of the nozzle cap and the outer surface of the needle valve body, the annular cavity being located at the end of the nozzle cap away from the injector body; a suitable sealing gasket is placed inside the annular cavity, and an interference gasket is fitted onto the needle valve body near the sealing gasket.

[0005] In some embodiments of this utility model, the needle valve body includes a first part and a second part coaxially connected. The first part and the second part are arranged sequentially from the direction away from the injector body to the direction closer to the injector body, and the outer diameter of the first part is smaller than the outer diameter of the second part. The nozzle cap is fitted on the second part and extends a predetermined length to the first part. The extension of the nozzle cap to the first part forms the annular receiving cavity between the nozzle cap and the first part.

[0006] In some embodiments of this invention, the size of the annular receiving cavity gradually decreases from its opening to its bottom.

[0007] In some embodiments of this utility model, an inclined surface is formed between the end face of the second component facing the first component and the outer surface of the first component.

[0008] In some embodiments of this invention, the inclined surface extends to the outer surface of the second split body.

[0009] In some embodiments of this utility model, the sealing gasket is press-fitted into the annular receiving cavity.

[0010] In some embodiments of this utility model, the sealing gasket is made of a high-temperature resistant material.

[0011] In some embodiments of this utility model, the interference gasket is made of copper.

[0012] According to a second aspect of the present invention, an engine is provided, including the above-described fuel injector.

[0013] According to a third aspect of the present invention, a mechanical device is provided, comprising the engine described above.

[0014] This application provides a fuel injector that features an annular cavity located between the inner surface of the nozzle cap and the outer surface of the needle valve body at the end of the nozzle cap furthest from the injector body. A sealing gasket is installed within this cavity, and an interference fit gasket is then fitted onto the needle valve body, bringing it close to the sealing gasket. This double-layer protection, provided by the interference fit gasket and the sealing gasket, effectively compensates for insufficient interference fit after prolonged operation and prevents direct contact between the fuel gasket and the sealing gasket, thus preventing aging. The combined use of these two features significantly reduces the likelihood of combustion products entering the injector shoulder, effectively controlling contact between combustion products and the injector shoulder, improving protection of the injector shoulder, and extending the injector's service life. Attached Figure Description

[0015] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0016] Figure 1 This is a schematic diagram of the injector structure of this application;

[0017] Figure 2This is a schematic diagram of the sealing gasket of this application.

[0018] The reference numerals in the attached diagram represent the following: 1. Injector body; 2. Needle valve body; 21. First part; 22. Second part; 23. Third part; 3. Needle valve; 4. Nozzle cap; 5. Annular cavity; 6. Sealing gasket; 7. Interference fit gasket. Detailed Implementation

[0019] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0020] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0021] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0022] This application discloses an injector. For example... Figure 1 and Figure 2 As shown, the injector includes an injector body 1, a needle valve body 2 located at one end of the injector body 1, a needle valve 3 located inside the needle valve body 2, and a nozzle cap 4 for connecting the needle valve body 2 and the injector body 1. The nozzle cap 4 is fitted onto the needle valve body 2, and an annular cavity 5 is formed between the inner surface of the nozzle cap 4 and the outer surface of the needle valve body 2. The annular cavity 5 is located at the end of the nozzle cap 4 away from the injector body 1. A suitable sealing gasket 6 is placed inside the annular cavity 5, and an interference gasket 7 is fitted onto the needle valve body 2 near the sealing gasket 6.

[0023] In this embodiment, an annular cavity 5 is provided at the end of the nozzle cap 4 away from the injector body 1, between the inner surface of the nozzle cap 4 and the outer surface of the needle valve body 2. A sealing gasket 6 is installed in the annular cavity 5. Then, an interference gasket 7 is interference-fitted onto the needle valve body 2, so that the interference gasket 7 is close to the sealing gasket 6. Thus, when the injector is running and the engine is working, the interference gasket 7, together with the sealing gasket 6, provides double-layer protection. This effectively compensates for the effectiveness problem caused by insufficient interference of the interference gasket 7 after long-term operation. The interference gasket 7 also prevents the combustion gas from directly contacting the sealing gasket 6 and causing it to age. The two work together to significantly reduce the possibility of combustion products entering the injector shoulder, i.e., the nozzle cap 4, effectively controlling the contact between combustion products and the injector shoulder, thereby improving the protection of the injector shoulder and extending the service life of the injector.

[0024] It should be noted that, Figure 1 The diagram only shows a portion of the injector's structure. In some embodiments of this invention, the injector body 1 is also provided or installed with structures such as an oil inlet pipe connector, an oil passage, an electromagnetic coil, and a return spring.

[0025] In some embodiments of this utility model, such as Figure 1 As shown, the needle valve body 2 includes a first part 21 and a second part 22 coaxially connected. The first part 21 and the second part 22 are arranged sequentially from the direction away from the injector body 1 to the direction closer to the injector body 1. The outer diameter of the first part 21 is smaller than the outer diameter of the second part 22. The nozzle cap 4 is sleeved on the second part 22 and extends to the first part 21 by a set length. The extension of the nozzle cap 4 to the first part 21 forms an annular receiving cavity 5 between the extension of the nozzle cap 4 to the first part 21 and the first part 21.

[0026] In this embodiment, by designing a reduced diameter from the first split 21 to the second split 22 and extending the nozzle cap 4 towards the first split 21, an annular cavity 5 can be naturally formed at the end of the second split 22 between the nozzle cap 4 and the first split 21. This reduces the impact on the respective structures, eliminates the need for additional slotting to form the annular cavity 5, and facilitates the insertion of the sealing gasket 6 from the end of the first split 21 and its sliding into the annular cavity 5. This avoids operations that may damage the sealing gasket 6 during installation, such as diameter expansion. As a result, the manufacturing cost of the injector is reduced, and the structural strength of the injector and the sealing effect of the sealing gasket 6 between the nozzle cap 4 and the needle valve body 2 are guaranteed.

[0027] In some embodiments of this utility model, the first part 21 and the second part 22 can be integrally formed.

[0028] It should be noted that a third part 23 is coaxially connected to one end of the second part 22 near the injector body 1. The third part 23 can also be integrally formed with the second part 22. That is, the first part 21, the second part 22 and the third part 23 together constitute the needle valve body 2.

[0029] In some embodiments of this utility model, such as Figure 1 As shown, the size of the annular cavity 5 gradually decreases from its opening to its bottom.

[0030] In this embodiment, the annular receiving cavity 5 is designed with a smaller inner diameter and a larger outer diameter, and a suitable sealing gasket 6 is designed, such as... Figure 2 As shown, this design facilitates the installation and embedding of the sealing gasket 6, and also enhances the sealing effect of the sealing gasket 6 in the annular cavity 5 on the gap between the oil nozzle cap 4 and the needle valve body 2.

[0031] Furthermore, such as Figure 1 As shown, an inclined surface is formed between the end face of the second part 22 facing the first part 21 and the outer surface of the first part 21.

[0032] By forming an inclined surface between the end face of the second part 22 and the outer surface of the first part 21, the side of the sealing gasket 6 located in the annular receiving cavity 5 can be naturally guided to the area between the inner surface of the oil nozzle cap 4 and the outer surface of the needle valve body 2, thereby further improving the sealing performance of the sealing gasket 6 on the gap between the oil nozzle cap 4 and the needle valve body 2.

[0033] Preferably, such as Figure 1 As shown, the inclined surface extends to the outer surface of the second component 22.

[0034] In some embodiments of this utility model, the inclined surface between the end face of the second part 22 and the outer surface of the first part 21 includes, but is not limited to, a plane or an arc-shaped surface.

[0035] like Figure 1 As shown, in one embodiment of this utility model, the second part 22 and the first part 21 are connected by an inwardly concave arc to form the aforementioned inclined surface. This improves the sealing effect of the sealing gasket 6 on the gap between the oil nozzle cap 4 and the needle valve body 2, while ensuring that the sealing gasket 6 is fully filled in the annular cavity 5, thus guaranteeing its long-term use effect.

[0036] In some embodiments of this utility model, the sealing gasket 6 is press-fitted into the annular receiving cavity 5.

[0037] It should be understood that in this embodiment, after the sealing gasket 6 is placed in the annular receiving cavity 5, the sealing gasket 6 partially protrudes from the annular receiving cavity 5. After the interference gasket 7 is installed, the interference gasket 7 compresses the sealing gasket 6 to a certain extent. After the interference gasket 7 contacts the oil nozzle cap 4, the sealing gasket 6 will be completely contained in the annular receiving cavity 5. With the help of the inclined surface, the sealing gasket 6 is guided to the area between the inner surface of the oil nozzle cap 4 and the outer surface of the needle valve body 2, which can effectively improve the effect of the sealing gasket 6.

[0038] In some embodiments of this utility model, the sealing gasket 6 can be made of high-temperature resistant materials, such as high-temperature resistant plastics, rubber and other materials with a certain degree of elasticity, such as polytetrafluoroethylene, perfluororubber and polyphenylene sulfide.

[0039] In some embodiments of this utility model, the interference gasket 7 is made of copper. The copper interference gasket 7 has good plasticity, high temperature resistance and corrosion resistance, which makes it have a good bonding effect with the needle valve body 2, thereby providing good protection for the sealing gasket 6.

[0040] In other embodiments of this utility model, the interference gasket 7 may be made of other metals, such as nickel-based alloys, as needed.

[0041] This embodiment also proposes an engine including a cylinder block, a cylinder head, and the aforementioned injector, wherein the injector is mounted on the cylinder head, and the needle valve body and needle valve face the cylinder block.

[0042] This embodiment also proposes a mechanical device that includes the engine described above.

[0043] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A fuel injector, characterized in that, It includes an injector body (1), a needle valve body (2) located at one end of the injector body (1), a needle valve (3) located within the needle valve body (2), and a nozzle cap (4) for connecting the needle valve body (2) to the injector body (1); wherein, The nozzle cap (4) is fitted onto the needle valve body (2). An annular cavity (5) is formed between the inner surface of the nozzle cap (4) and the outer surface of the needle valve body (2). The annular cavity (5) is located at the end of the nozzle cap (4) away from the injector body (1). The annular cavity (5) contains a suitable sealing gasket (6), and an interference gasket (7) is fitted on the needle valve body (2) near the sealing gasket (6).

2. The injector according to claim 1, characterized in that, The needle valve body (2) includes a first part (21) and a second part (22) connected coaxially. The first part (21) and the second part (22) are arranged sequentially from the direction away from the injector body (1) to the direction close to the injector body (1). The outer diameter of the first part (21) is smaller than the outer diameter of the second part (22). The nozzle cap (4) is sleeved on the second part (22) and extends to the first part (21) by a set length. The extension of the nozzle cap (4) to the first part (21) forms the annular receiving cavity (5) between the extension of the nozzle cap (4) to the first part (21) and the first part (21).

3. The injector according to claim 2, characterized in that, The size of the annular cavity (5) gradually decreases from its opening to its bottom.

4. The injector according to claim 3, characterized in that, An inclined surface is formed between the end face of the second part (22) facing the first part (21) and the outer surface of the first part (21).

5. The injector according to claim 4, characterized in that, The inclined surface extends to the outer surface of the second component (22).

6. The injector according to any one of claims 1 to 5, characterized in that, The sealing gasket (6) is pressed and installed inside the annular receiving cavity (5).

7. The injector according to any one of claims 1 to 5, characterized in that, The sealing gasket (6) is made of high temperature resistant material.

8. The injector according to any one of claims 1 to 5, characterized in that, The interference gasket (7) is made of copper.

9. An engine, characterized in that, Including the injector as described in any one of claims 1 to 8.

10. A mechanical device, characterized in that, Including the engine as described in claim 9.

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