Ejector assembly and engine

Abstract

The utility model relates to the technical field of engines, and particularly discloses an ejector assembly and an engine, the ejector assembly comprises an ejector bushing and a nozzle, the ejector bushing comprises a bushing main body and a sealing sleeve connected with the bushing main body, and the bushing main body is embedded in a cylinder cover; the nozzle comprises a nozzle body and an injection part connected with the nozzle body, the nozzle body is sleeved with the lining body, a fuel injection hole used for injecting fuel into the combustion chamber is formed in the bottom end of the injection part, the inner diameter of the sealing sleeve is gradually reduced from top to bottom, and the sealing sleeve is arranged at the top end of the injection part in a sleeving mode and attached to the top end of the injection part in a sealed mode. The nozzle body can be prevented from making contact with high-temperature gas, the temperature of the nozzle is effectively lowered, carbon deposition in a fuel injection hole is avoided, the inner diameter of the sealing sleeve is gradually reduced from top to bottom, the sealing sleeve is of a necking structure, and the sealing sleeve is convenient to mount and dismount.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to an injector assembly and an engine. Background Art

[0002] The injector is mounted on the cylinder head via a bushing, and its nozzle extends into the combustion chamber, performing the fuel injection function during compression ignition. The injector nozzle is a critical component for controlling the amount of fuel injected into the engine and plays a vital role in its proper functioning. However, in related art, the injector bushing and the nozzle have a gap fit, and the nozzle is exposed to the high-temperature gases in the combustion chamber for a long time, which can easily lead to carbon deposits in the fuel injection hole, causing blockage and affecting normal engine operation.

[0003] In this regard, the related art provides an injector assembly, which makes the injector bushing and the injection end of the nozzle have an interference fit, or sets a seal between the injector bushing and the nozzle to reduce the contact area between the nozzle and the high-temperature gas, thereby reducing the nozzle temperature and avoiding carbon deposits in the fuel injection hole of the nozzle. However, the end of the injector bushing is usually retracted inside the cylinder head, resulting in a large area of ​​the nozzle exposed to the high-temperature gas, which is also easy to cause the nozzle temperature to be too high, thereby causing carbon deposits in the fuel injection hole; in addition, the interference fit between the bushing and the injection end of the nozzle, or the sealing fit through the seal is not convenient for installation. Utility Model Content

[0004] The purpose of the utility model is to provide an injector assembly and an engine to solve the problem in existing injector assemblies that the bushing and the injection end of the nozzle have an interference fit, or that the sealing fit through a seal is inconvenient to install.

[0005] In one aspect, the present invention provides an injector assembly, comprising:

[0006] An injector bushing, the injector bushing comprising a bushing body and a sealing sleeve connected to the bushing body, the bushing body being adapted to be embedded in a cylinder head, the inner diameter of the sealing sleeve gradually decreasing from top to bottom;

[0007] The nozzle includes a nozzle body and an injection part, the sleeve body is sleeved on the nozzle body, the top end of the injection part is connected to the nozzle body, the sealing sleeve is sleeved on the top end of the injection part, and the sealing sleeve is sealed and fitted with the top end of the injection part, and the bottom end of the injection part is located outside the sealing sleeve and is provided with a fuel injection hole for injecting fuel into the combustion chamber.

[0008] As a preferred technical solution of the injector assembly, the sealing sleeve includes a first sealing surface, the injection portion has a first mating surface, the first sealing surface and the first mating surface are sealed and attached, and the first sealing surface and the first mating surface are both conical;

[0009] The first sealing surface and the first matching surface are both conical, or one of the first sealing surface and the first matching surface is conical and the other is spherical.

[0010] As a preferred technical solution of the injector assembly, the bushing body includes a second sealing surface, and the second sealing surface and the first sealing surface are spaced apart, and the nozzle body includes a second mating surface, and the second sealing surface and the second mating surface are sealingly fitted.

[0011] As a preferred technical solution of the injector assembly, the second sealing surface and the second mating surface are both conical; or, one of the second sealing surface and the second mating surface is conical and the other is spherical.

[0012] As a preferred technical solution of the injector assembly, the bushing body further includes a connecting surface connecting the first sealing surface and the second sealing surface, and the connecting surface is clearance-fitted with the outer peripheral surface of the nozzle body.

[0013] As a preferred technical solution of the injector assembly, the connecting surface is cylindrical.

[0014] As an optimal technical solution for the injector assembly, the injector assembly also includes a sealing gasket made of heat-conductive material, the sealing gasket is sleeved on the nozzle body and the sealing gasket is located in the bushing body, and along the center line direction of the nozzle, the bushing body, the sealing gasket and the nozzle body are sealed and fitted in sequence.

[0015] As a preferred technical solution of the injector assembly, the sealing sleeve can extend into the combustion chamber.

[0016] The injector assembly provided by the utility model has at least the following beneficial effects:

[0017] The injector assembly includes an injector sleeve and a nozzle. The injector sleeve includes a sleeve body and a sealing sleeve connected to the sleeve body. The sleeve body is used to be embedded in the cylinder head, and the inner diameter of the sealing sleeve gradually decreases from top to bottom; the nozzle includes a nozzle body and an injection part. The sleeve body is sleeved on the nozzle body, the top end of the injection part is connected to the nozzle body, the sealing sleeve is sleeved on the top end of the injection part, and the sealing sleeve is sealed and fitted with the top end of the injection part. The bottom end of the injection part is located outside the sealing sleeve and is provided with a fuel injection hole for injecting fuel into the combustion chamber. The sealing sleeve and the top end of the injection part are sealed and fitted, so that the nozzle body can be avoided from contacting with high-temperature gas, the nozzle temperature can be reduced, and carbon deposits in the fuel injection hole can be avoided; by gradually reducing the inner diameter of the sealing sleeve from top to bottom, the sealing sleeve has a necking structure, which is convenient for installation and disassembly of the sealing sleeve.

[0018] On the other hand, the present invention provides an engine comprising a cylinder head and the injector assembly of any of the above schemes, wherein the nozzle body is mounted on the cylinder head, the engine further comprises a combustion chamber, and the injection parts extend into the combustion chamber.

[0019] As a preferred technical solution of the engine, the nozzle body is threadedly connected to the cylinder head.

[0020] As a preferred technical solution of the engine, the bushing body abuts against the cylinder head along the center line direction of the injector bushing.

[0021] As a preferred technical solution of the engine, the cylinder head is provided with a coolant flow channel surrounding the outer periphery of the bushing body.

[0022] The engine component provided by the utility model has at least the following beneficial effects:

[0023] The engine includes the above-mentioned injector assembly, and carbon deposits are not easily generated in the fuel injection hole of the fuel injection nozzle, which can improve the reliability of engine operation and facilitate the installation and removal of the sealing sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional view of a partial structure of an injector assembly in an embodiment of the present utility model;

[0025] Figure 2 A cross-sectional view of another partial structure of the injector assembly in an embodiment of the present utility model;

[0026] Figure 3 It is a partial structural sectional view of the engine in an embodiment of the present utility model.

[0027] In the picture:

[0028] 1. Injector bushing; 11. Bushing body; 111. Second sealing surface; 112. Connecting surface; 12. Sealing sleeve; 121. First sealing surface;

[0029] 2. Nozzle; 21. Nozzle body; 211. Second mating surface; 22. Injection portion; 221. Fuel injection hole; 222. First mating surface;

[0030] 3. Cylinder head; 31. Cooling channel;

[0031] 4. Sealing gasket. DETAILED DESCRIPTION

[0032] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a specific position, be constructed and operated in a specific position, and therefore should not be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] In the related art, the injector bushing and the nozzle are fitted with a clearance, and the nozzle is exposed to the high-temperature gas in the combustion chamber for a long time, which easily leads to carbon deposits in the fuel injection hole, and then causes the fuel injection hole to be blocked, affecting the normal operation of the engine. In response to this, the related art provides an injector assembly, which makes the injector bushing and the injection end of the nozzle have an interference fit, or sets a seal between the injector bushing and the nozzle to reduce the contact area between the nozzle and the high-temperature gas, thereby reducing the nozzle temperature and avoiding the formation of carbon deposits in the fuel injection hole of the nozzle. However, the end of the injector bushing is usually retracted into the cylinder head, resulting in a large area of ​​the nozzle exposed to the high-temperature gas, which is also easy to cause the nozzle temperature to be too high, and then cause carbon deposits in the fuel injection hole; in addition, the interference fit between the bushing and the injection end of the nozzle, or the sealing fit through the seal, is not convenient for installation.

[0037] To this end, this embodiment provides an injector assembly to solve the above problems.

[0038] Figure 1 is a partial cross-sectional view of the injector assembly in this embodiment, Figure 2 A cross-sectional view of another partial structure of the injector assembly in an embodiment of the present utility model; Figure 3 It is a partial cross-sectional view of the engine in this embodiment, wherein: Figure 3 The cylinder head 3 and the injector bushing 1 are cut open, but the nozzle 2 is not cut open. Figures 1 to 3The injector assembly includes an injector bushing 1 and a nozzle 2. The injector bushing 1 includes a bushing body 11 and a sealing sleeve 12 connected to the bushing body 11. The bushing body 11 is used to be embedded in the cylinder head 3, and the inner diameter of the sealing sleeve 12 gradually decreases from top to bottom. The nozzle 2 includes a nozzle body 21 and an injection part 22. The bushing body 11 is sleeved on the nozzle body 21. The top end of the injection part 22 is connected to the nozzle body 21. The sealing sleeve 12 is sleeved on the top end of the injection part 22, and the sealing sleeve 12 is sealed and fitted with the top end of the injection part 22. The bottom end of the injection part 22 is located outside the sealing sleeve 12 and is provided with a fuel injection hole 221 for injecting fuel into the combustion chamber. With such an arrangement, the injection portion 22 of the nozzle 2 injects the fuel from the fuel injection hole 221 into the combustion chamber, and a combustion reaction is carried out in the combustion chamber to generate high-temperature gas. The sealing sleeve 12 and the top end of the injection portion 22 are sealed and fitted to avoid contact between the nozzle body 21 and the high-temperature gas, thereby reducing the temperature of the nozzle 2 and avoiding carbon deposits in the fuel injection hole 221. By gradually reducing the inner diameter of the sealing sleeve 12 from top to bottom, the sealing sleeve 12 has a constricted structure, which facilitates the installation and removal of the sealing sleeve 12.

[0039] In this embodiment, the vertical direction is as follows: Figure 1 As shown by the middle arrows ab, the injector bushing 1 is made of metal. The injector bushing 1 can absorb the heat of the high-temperature gas in the combustion chamber and transfer the temperature to the cylinder head 3 in a timely manner.

[0040] Optionally, the sealing sleeve 12 extends into the combustion chamber. By extending the sealing sleeve 12 of the injector bushing 1 into the combustion chamber, the area of ​​the injection portion 22 directly exposed to the combustion chamber can be reduced, so that only a small portion of the injection portion 22 is in direct contact with the heat-insulating gas, which can further reduce the temperature of the nozzle 2 and thus prevent carbon deposits from forming in the fuel injection hole 221.

[0041] Optionally, the nozzle 2 is provided with a plurality of fuel injection holes 221, which are evenly distributed along the circumference of the nozzle 2 to ensure that the fuel can be evenly injected into the combustion chamber. In this embodiment, the plurality of fuel injection holes 221 are used to inject the same fuel, such as diesel, natural gas, etc. In other embodiments, a portion of the plurality of fuel injection holes 221 can be used to inject a first fuel, such as diesel, while another portion is used to inject a second fuel, such as natural gas.

[0042] Optionally, the sealing sleeve 12 includes a first sealing surface 121, and the injection portion 22 has a first mating surface 222. The first sealing surface 121 and the first mating surface 222 are sealed together, and both the first sealing surface 121 and the first mating surface 222 are conical, or one of the first sealing surface 121 and the first mating surface 222 is conical and the other is spherical. Specifically, the aperture of the cone or sphere formed by the first sealing surface 121 and the first mating surface 222 gradually decreases from top to bottom. In this configuration, the sealing sleeve 12 and the injection portion 22 are sealed together by the conical surface and the conical surface, or by the conical surface and the spherical surface. Only a vertical downward external force needs to be applied to the nozzle 2 to ensure that the first mating surface 222 is tightly attached to the first sealing surface 121. This facilitates installation and can ensure the stability of the sealing effect.

[0043] Optionally, the bushing body 11 includes a second sealing surface 111 spaced apart from the first sealing surface 121, and the nozzle body 21 includes a second mating surface, with the second sealing surface 111 sealingly contacting the second mating surface. This arrangement ensures a large contact area between the injector bushing 1 and the nozzle 2, facilitating heat exchange with the nozzle 2 and promptly transferring the temperature to the cylinder head 3. It also prevents fuel leakage.

[0044] Optionally, both the second sealing surface 111 and the second mating surface are conical, or one of the second sealing surface 111 and the second mating surface is conical and the other is spherical. Specifically, the apertures of the cone or sphere formed by the second sealing surface 111 and the second mating surface gradually decrease from top to bottom. The bushing body 11 and the nozzle body 21 are sealed and matched by the conical surface and the conical surface, or by the conical surface and the spherical surface. When a vertically downward external force is applied to the nozzle 2, it can simultaneously ensure that the first mating surface 222 is tightly fitted on the first sealing surface 121, and the second mating surface is tightly fitted on the first sealing surface 121, making installation convenient.

[0045] Optionally, the sleeve body 11 further includes a connecting surface 112 connecting the first sealing surface 121 and the second sealing surface 111, and the connecting surface 112 is clearance-fitted with the outer peripheral surface of the nozzle body 21. This arrangement prevents the connecting surface 112 from contacting the nozzle 2 when the nozzle 2 is assembled or disassembled, facilitating assembly or disassembly.

[0046] Specifically, in this embodiment, the connection surface 112 is cylindrical. In other embodiments, the connection surface 112 can also be configured to be conical or the like as needed.

[0047] As an alternative, please refer to Figure 2The injector assembly also includes a sealing gasket 4 made of a thermally conductive material. This gasket 4 is sleeved over the nozzle body 21 and positioned within the bushing body 11. Along the centerline of the nozzle 2, the bushing body 11, the sealing gasket 4, and the nozzle body 21 are sequentially sealed and attached. This arrangement also prevents fuel leakage and ensures a large contact area between the injector bushing 1 and the nozzle 2, facilitating heat exchange with the nozzle 2 and promptly transferring heat to the cylinder head 3. Specifically, the sealing gasket 4 can be made of a metal material such as copper.

[0048] Please refer to Figure 3 This embodiment also provides an engine, comprising a cylinder head 3 and the above-mentioned injector assembly, wherein the nozzle body 21 is mounted on the cylinder head 3. The engine also has a combustion chamber, into which the injection portion 22 extends. Specifically, the engine also includes a cylinder block and a piston slidably mounted on the cylinder block. The cylinder head 3 is mounted on the cylinder block. When the piston reaches top dead center, the top surface of the piston and the cylinder head 3 enclose a combustion chamber. Because the sealing sleeve 12 of the injector bushing 1 covers the top of the injection portion 22 of the nozzle 2, only a small portion of the injection portion 22 is exposed in the combustion chamber. When the fuel injected from the fuel injection hole 221 of the injection portion 22 burns in the combustion chamber, the high-temperature gas generated only contacts this small portion of the injection portion 22. This effectively reduces the impact of the high-temperature gas on the nozzle 2, thereby preventing carbon deposits in the fuel injection hole 221 and ensuring stable engine operation. In addition, the inner diameter of the sealing sleeve 12 gradually decreases from top to bottom, resulting in a tapered structure of the sealing sleeve 12, which facilitates installation and removal of the sealing sleeve 12. The piston moves in the cylinder body, and the position at the highest point where the top surface of the piston reaches is called top dead center. At this time, the top surface of the piston is farthest from the center of rotation of the crankshaft.

[0049] Optionally, the sealing sleeve 12 can extend into the combustion chamber, which can reduce the area of ​​the injection portion 22 directly exposed to the combustion chamber, so that only a small portion of the injection portion 22 is in direct contact with the heat-insulating gas, effectively reducing the temperature of the nozzle 2 and thus preventing carbon deposits from forming in the fuel injection hole 221.

[0050] Optionally, the nozzle body 21 is threadedly connected to the cylinder head 3 . This arrangement facilitates assembly of the nozzle body 21 and the cylinder head 3 .

[0051] Optionally, the bushing body 11 abuts against the cylinder head 3 along the centerline direction of the injector bushing 1. This arrangement can effectively limit the dimension of the sealing sleeve 12 extending into the combustion chamber.

[0052] Optionally, the cylinder head 3 is provided with a coolant flow channel surrounding the outer periphery of the liner body 11. In this way, the heat absorbed by the injector liner 1 can be promptly removed by the coolant in the cooling flow channel 31, thereby preventing the nozzle 2 from overheating.

[0053] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An ejector assembly, characterized in that: include: An injector bushing (1), the injector bushing (1) comprising a bushing body (11) and a sealing sleeve (12) connected to the bushing body (11), the bushing body (11) being used to be embedded in a cylinder head (3), and the inner diameter of the sealing sleeve (12) gradually decreasing from top to bottom; The nozzle (2) comprises a nozzle body (21) and an injection portion (22), wherein the sleeve body (11) is sleeved on the nozzle body (21), the top end of the injection portion (22) is connected to the nozzle body (21), the sealing sleeve (12) is sleeved on the top end of the injection portion (22), and the sealing sleeve (12) is sealed and fitted with the top end of the injection portion (22), and the bottom end of the injection portion (22) is located outside the sealing sleeve (12) and is provided with a fuel injection hole (221) for injecting fuel into a combustion chamber.

2. The injector assembly according to claim 1, wherein: The sealing sleeve (12) comprises a first sealing surface (121), the injection portion (22) has a first mating surface (222), and the first sealing surface (121) and the first mating surface (222) are in sealing contact with each other; The first sealing surface (121) and the first matching surface (222) are both conical, or one of the first sealing surface (121) and the first matching surface (222) is conical and the other is spherical.

3. The injector assembly according to claim 2, wherein: The bushing body (11) includes a second sealing surface (111), and the second sealing surface (111) and the first sealing surface (121) are spaced apart. The nozzle body (21) includes a second mating surface, and the second sealing surface (111) and the second mating surface are sealed and fitted.

4. The injector assembly according to claim 3, wherein: The second sealing surface (111) and the second matching surface are both conical; or, one of the second sealing surface (111) and the second matching surface is conical and the other is spherical.

5. The injector assembly according to claim 3, wherein: The bushing body (11) further includes a connecting surface (112) connecting the first sealing surface (121) and the second sealing surface (111), and the connecting surface (112) is clearance-fitted with the outer peripheral surface of the nozzle body (21).

6. The injector assembly according to claim 5, wherein: The connecting surface (112) is cylindrical.

7. The injector assembly according to claim 2, wherein: The injector assembly further comprises a sealing gasket (4) made of a heat-conducting material, wherein the sealing gasket (4) is sleeved on the nozzle body (21) and the sealing gasket (4) is located inside the bushing body (11), and along the centerline direction of the nozzle (2), the bushing body (11), the sealing gasket (4) and the nozzle body (21) are sealed and fitted in sequence.

8. The injector assembly according to any one of claims 1 to 7, characterized in that The sealing sleeve (12) can extend into the combustion chamber.

9. An engine, characterized in that: The invention comprises a cylinder head (3) and the injector assembly according to any one of claims 1 to 8, wherein the nozzle body (21) is mounted on the cylinder head (3), the engine further comprises a combustion chamber, and the injection portion (22) extends into the combustion chamber.

10. The engine according to claim 9, characterized in that The nozzle body (21) is threadedly connected to the cylinder head (3).

11. The engine according to claim 9, characterized in that The bushing body (11) abuts against the cylinder head (3) along the center line direction of the injector bushing (1).

12. The engine according to claim 9, characterized in that The cylinder head (3) is provided with a coolant flow channel surrounding the outer periphery of the bushing body (11).

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