Ejector assembly and engine

Abstract

The utility model relates to the technical field of engines, in particular to an ejector assembly and an engine, the ejector assembly comprises an ejector bushing and a nozzle, and the ejector bushing comprises a plurality of sealing surfaces which are sequentially arranged at intervals in the direction of the center line of the ejector bushing; the nozzle comprises a nozzle body and an injection part connected with the nozzle body, the nozzle body is sleeved with the injector bush, the multiple sealing faces are attached to the outer surface of the end, close to the injection part, of the nozzle body in a sealed mode, and the injection part is provided with a first fuel injection hole used for injecting first fuel into the combustion chamber. The ejector bush is in sealing fit with the nozzle body through the multiple sealing faces so as to guarantee the sealing effect, high-temperature gas is prevented from entering the position between the nozzle and the ejector bush, the ejector bush makes contact with the nozzle through the multiple sealing faces, the heat dissipation effect of the ejector bush on the nozzle can be improved, the temperature of the nozzle can be reduced, and carbon deposition of a fuel injection hole is avoided. In addition, the sealing surface and the nozzle body are convenient to assemble through surface contact sealing.

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 fuel supply method of the engine is to spray gas and / or fuel into the combustion chamber through the injector to drive the engine. Among them, the injector is a key component for controlling the amount of fuel injected into the engine and plays an important role in the normal operation of the engine.

[0003] The injector nozzle is exposed to the high-temperature gas in the combustion chamber for a long time. In order to avoid carbon deposits in the fuel injection hole, the injector assembly provided in the related art has a seal between the injector bushing and the front end of the nozzle. The injector bushing and the rear end of the nozzle are sealed and fitted 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 actual effect of reducing the contact area between the nozzle and the high-temperature gas is to set a seal between the injector bushing and the front end of the nozzle. However, there is only one seal, and the sealing effect is unreliable. When the seal fails, carbon deposits are still likely to form in the fuel injection hole of the nozzle. In addition, the seal is inconvenient to operate during installation, resulting in low installation efficiency. Utility Model Content

[0004] The purpose of the present utility model is to provide an injector assembly and an engine to improve the reliability of the sealing effect between the injector bushing and the nozzle, avoid carbon deposits in the fuel injection hole of the nozzle, ensure the normal operation of the engine, and improve installation efficiency.

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

[0006] An injector bushing, the injector bushing being mounted on a cylinder head, the injector bushing comprising a plurality of sealing surfaces sequentially spaced apart along a centerline direction of the injector bushing;

[0007] The nozzle comprises a nozzle body and an injection portion connected to the nozzle body, the injector sleeve is sleeved on the nozzle body, the multiple sealing surfaces are sealed with the outer surface of one end of the nozzle body close to the injection portion, the injection portion extends out of the nozzle body, and the injection portion is provided with a first fuel injection hole, the first fuel injection hole is used to inject the first fuel into the combustion chamber.

[0008] As a preferred technical solution of the injector assembly, the sealing surface is conical, and the nozzle body includes a plurality of conical or spherical mating surfaces, and the plurality of sealing surfaces are tightly fitted with the plurality of mating surfaces.

[0009] As a preferred technical solution of the injector assembly, among any two adjacent sealing surfaces, the inner diameter of the sealing surface close to the injection portion is not greater than the inner diameter of the sealing surface away from the injection portion.

[0010] As a preferred technical solution of the injector assembly, the injector bushing further includes a connecting surface, and any two adjacent sealing surfaces are connected via the connecting surface, and the connecting surface is clearance-matched with the outer surface of the nozzle body.

[0011] As a preferred technical solution of the injector assembly, the connecting surface is cylindrical.

[0012] As a preferred technical solution of the injector assembly, the number of the sealing surfaces is three or more.

[0013] The injector assembly provided by the utility model has at least the following beneficial effects:

[0014] The injector assembly includes an injector bushing and a nozzle. The injector bushing is used to be installed on the cylinder head. The injector bushing includes a plurality of sealing surfaces arranged in sequence along the center line direction of the injector bushing; the nozzle includes a nozzle body and an injection part connected to the nozzle body. The injector bushing is sleeved on the nozzle body. The plurality of sealing surfaces are all sealed and fitted with the outer surface of the nozzle body at one end close to the injection part. The injection part extends out of the nozzle body, and the injection part is provided with a first fuel injection hole. The first fuel injection hole is used to inject the first fuel into the combustion chamber. The end of the injector bushing close to the injection part of the nozzle is sealed with the nozzle body through a plurality of sealing surfaces, which can fully ensure the sealing effect and prevent high-temperature gas from entering between the nozzle and the injector bushing, thereby preventing carbon deposits from forming in the fuel injection hole of the nozzle; at the same time, the injector bushing contacts the nozzle through a plurality of sealing surfaces, and also increases the number of heat transfer paths between the injector bushing and the nozzle, which can improve the heat dissipation effect of the injector bushing on the nozzle; in addition, the sealing surface and the nozzle body are sealed by surface contact, which is also convenient for assembly.

[0015] 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 injector bushing is embedded in the cylinder head, and the injection portion extends into the combustion chamber of the engine.

[0016] As a preferred technical solution of the engine, the injector bushing is threadedly connected to the cylinder head.

[0017] As a preferred technical solution of the engine, along the centerline direction of the nozzle, the injector bushing abuts against the cylinder head, and one end of the injector bushing close to the injection portion is retracted into the cylinder head.

[0018] As an optimal technical solution for the engine, a coolant flow channel is provided in the cylinder head, and the coolant flow channel surrounds the outer circumference of the injector bushing.

[0019] The engine provided by the utility model has at least the following beneficial effects:

[0020] The engine includes the above-mentioned injector assembly, which can fully reduce the temperature of the nozzle, avoid carbon deposits in the fuel injection hole of the nozzle, improve the reliability of the nozzle, and ensure that the engine can run stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of a partial structure of an engine in an embodiment of the present utility model;

[0022] Figure 2 A cross-sectional view of a local structure of an injector bushing in an embodiment of the present utility model;

[0023] Figure 3 It is a cross-sectional view of the local structure of the nozzle in the embodiment of the present utility model.

[0024] In the picture:

[0025] 1. Injector bushing; 11. Sealing surface; 12. Connecting surface; 13. First cone surface;

[0026] 2. Nozzle; 21. Nozzle body; 211. Matching surface; 212. Second conical surface; 22. Injection portion; 221. First fuel injection hole; 222. Second fuel injection hole;

[0027] 3. Cylinder head; 31. Coolant flow channel. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] The injector nozzle is exposed to the high-temperature gas in the combustion chamber for a long time. In order to avoid carbon deposits in the fuel injection hole, the injector assembly provided in the related art has a seal between the injector bushing and the front end of the nozzle. The injector bushing and the rear end of the nozzle are sealed and fitted 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 actual effect of reducing the contact area between the nozzle and the high-temperature gas is to set a seal between the injector bushing and the front end of the nozzle. However, there is only one seal, and the sealing effect is unreliable. When the seal fails, carbon deposits are still likely to form in the fuel injection hole of the nozzle. In addition, the seal is inconvenient to operate during installation, resulting in low installation efficiency.

[0033] To this end, this embodiment provides an injector assembly to solve the above problems.

[0034] Please refer to Figures 1 to 3 The injector assembly includes an injector bushing 1 and a nozzle 2. The injector bushing 1 is used to be mounted on the cylinder head 3 and includes multiple sealing surfaces 11 spaced apart along the centerline of the injector bushing 1. The nozzle 2 includes a nozzle body 21 and an injection portion 22 connected to the nozzle body 21. The injector bushing 1 is sleeved on the nozzle body 21, and the multiple sealing surfaces 11 are all in sealing contact with the outer surface of the nozzle body 21 at one end near the injection portion 22. The injection portion 22 extends out of the nozzle body 21 and is provided with a first fuel injection hole 221. The first fuel injection hole 221 is used to inject the first fuel into the combustion chamber. With such arrangement, one end of the injector bushing 1 close to the injection portion 22 of the nozzle 2 is sealed with the nozzle body 21 through multiple sealing surfaces 11, which can fully ensure the sealing effect and prevent high-temperature gas from entering between the nozzle 2 and the injector bushing 1, thereby preventing carbon deposits from being generated in the fuel injection hole of the nozzle 2; at the same time, the injector bushing 1 contacts the nozzle 2 through multiple sealing surfaces 11, and the number of heat transfer paths between the injector bushing 1 and the nozzle 2 is increased, which can enhance the heat dissipation effect of the injector bushing 1 on the nozzle 2; in addition, the sealing surface 11 and the nozzle body 21 are sealed through surface contact, which is also convenient for assembly.

[0035] It should be noted that, in this embodiment, the injector bushing 1 is made of metal, which can effectively absorb the heat dissipated by the nozzle 2 and transfer the heat to the cylinder head 3 .

[0036] Optionally, the injection portion 22 is further provided with a second fuel injection hole 222 for injecting a second fuel into the combustion chamber. In this embodiment, the first fuel injection hole 221 is exemplified for injecting natural gas, and the second fuel injection hole 222 is exemplified for injecting diesel. This configuration enables the nozzle 2 to simultaneously inject two different fuels. In other embodiments, the first fuel injection hole 221 and the second fuel injection hole 222 of the nozzle 2 can also be used to inject the same fuel, or the injection portion 22 can be provided with only the first fuel injection hole 221 without the second fuel injection hole 222.

[0037] Optionally, the injection portion 22 is provided with a plurality of first fuel injection holes 221 and a plurality of second fuel injection holes 222, and the plurality of first fuel injection holes 221 and the plurality of second fuel injection holes 222 are uniformly distributed along the circumferential direction of the nozzle 2. Such an arrangement can ensure that the first fuel and the second fuel are uniformly injected into the burner, thereby ensuring that the first fuel and the second fuel can be fully and evenly burned in the combustion chamber.

[0038] Optionally, in this embodiment, the injector bushing 1 and the end of the nozzle body 21 away from the injection portion 22 are in line contact and sealed. When the injector bushing 1 forms a multi-pass seal with the nozzle body 21 through multiple sealing surfaces 11, the injector bushing 1 and the end of the nozzle body 21 away from the injection portion 22 only need to be in line contact and sealed to effectively prevent fuel leakage. At the same time, the line contact seal is also convenient for assembly and can reduce the processing accuracy requirements of the injector bushing 1 and the nozzle 2. Specifically, the injector bushing 1 includes a first conical surface 13, and the nozzle body 21 includes a second conical surface 212. The first conical surface 13 and the second conical surface 212 have different cone angles, and the two are in line contact and form a seal. In other embodiments, the injector bushing 1 and the end of the nozzle body 21 away from the injection portion 22 can also be in contact and sealed, or the second conical surface 212 can be replaced by a spherical surface.

[0039] Alternatively, this embodiment exemplifies a solution in which the number of sealing surfaces 11 is three. With this arrangement, the injector bushing 1 and the end of the nozzle body 21 adjacent to the injection portion 22 can form three seals, which can fully ensure a sealing effect. At the same time, it can also ensure that the injector bushing 1 and the nozzle 2 have a sufficiently large contact area to ensure heat dissipation of the nozzle 2. In other embodiments, the number of sealing surfaces 11 can also be two, four, or more.

[0040] Optionally, the sealing surface 11 is conical, and the nozzle body 21 includes multiple conical or spherical mating surfaces 211. The multiple sealing surfaces 11 are tightly fitted with the multiple mating surfaces 211. In this arrangement, the conical sealing surface 11 and the mating surfaces 211 cooperate with each other to form a seal, which can fully ensure a stable sealing effect. Of course, in other embodiments, the sealing surface 11 and the mating surface 211 can also be configured as planes, and both the sealing surface 11 and the mating surface 211 are perpendicular to the centerline of the nozzle 2.

[0041] Optionally, of any two adjacent sealing surfaces 11, the inner diameter of the sealing surface 11 closer to the injection portion 22 is no greater than the inner diameter of the sealing surface 11 farther from the injection portion 22. With this arrangement, only a force applied along the centerline of the nozzle 2 is required to ensure that the outer surface of the nozzle body 21 is in full contact with the multiple sealing surfaces 11 and form a seal.

[0042] Optionally, the injector bushing 1 further includes a connecting surface 12, connecting any two adjacent sealing surfaces 11 via the connecting surface 12. The connecting surface 12 forms a clearance fit with the outer surface of the nozzle body 21. This arrangement prevents contact between the connecting surface 12 and the nozzle body 21 when the nozzle 2 is installed into the injector bushing 1, facilitating assembly. Preferably, in addition to the multiple sealing surfaces 11 and the line contact between the first tapered surface 13 and the second tapered surface 212, the injector bushing 1 and the nozzle body 21 are also clearance-fitted, facilitating assembly and disassembly of the nozzle 2 and maintenance.

[0043] Optionally, the connecting surface 12 is cylindrical. In this way, a step is formed between the adjacent sealing surfaces 11 and the connecting surface 12, which is convenient for processing.

[0044] Please refer to Figure 1 This embodiment further provides an engine comprising a cylinder head 3 and the aforementioned injector assembly. The injector bushing 1 is embedded in the cylinder head 3, and the injection portion 22 extends into the engine's combustion chamber. Specifically, the engine further comprises a cylinder block and a piston. The piston is slidably disposed in the cylinder block. The cylinder head 3 is mounted on the cylinder block. When the piston slides to top dead center, a combustion chamber is enclosed between the top surface of the piston and the cylinder head 3. When the fuel injected from the first fuel injection hole 221 and the second fuel injection hole 222 of the injection portion 22 burns in the combustion chamber, a large amount of high-temperature gas will be generated. The injector bushing 1 forms three seals with the nozzle body 21 through three sealing surfaces 11, which can isolate the high-temperature gas from entering the gap between the nozzle 2 and the injector bushing 1, reduce the transfer of heat in the cylinder to the nozzle 2, and avoid the formation of carbon deposits in the first fuel injection hole 221 and the second fuel injection hole 222 of the nozzle 2; at the same time, the injector bushing 1 contacts the nozzle 2 through three sealing surfaces 11, forming three heat transfer paths, which is beneficial to the heat dissipation of the nozzle 2, further reducing the temperature of the nozzle 2, improving the reliability of the nozzle 2, and ensuring the stable operation of the engine. Among them, the piston moves in the cylinder body, and the position where the top surface of the piston reaches the highest point is called the top dead center. At this time, the top surface of the piston is farthest from the center of rotation of the crankshaft.

[0045] Specifically, in this embodiment, the injector bushing 1 is threadedly connected to the cylinder head 3 , which facilitates assembly and maintenance between the injector bushing 1 and the cylinder head 3 .

[0046] Optionally, the injector bushing 1 abuts against the cylinder head 3 along the centerline direction of the nozzle 2. This arrangement can ensure that the position between the injector bushing 1 and the cylinder head 3 is stable, thereby ensuring that the position of the nozzle 2 relative to the cylinder head 3 is stable after the nozzle 2 is installed in the injector bushing 1; in addition, the end of the injector bushing 1 close to the injection part 22 is retracted into the cylinder head 3, which can effectively increase the space of the combustion chamber.

[0047] Optionally, a coolant flow channel 31 is provided in the cylinder head 3, and the coolant flow channel 31 surrounds the outer circumference of the injector bushing 1. By providing the coolant flow channel 31, the temperature of the injector bushing 1 can be promptly removed by the coolant, thereby ensuring the heat dissipation effect of the injector bushing 1 on the nozzle 2.

[0048] 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) being used for being mounted on a cylinder head (3), the injector bushing (1) comprising a plurality of sealing surfaces (11) sequentially spaced apart along a centerline direction of the injector bushing (1); A nozzle (2), the nozzle (2) comprising a nozzle body (21) and an injection portion (22) connected to the nozzle body (21), the injector sleeve (1) being sleeved on the nozzle body (21), the plurality of sealing surfaces (11) being in sealing contact with the outer surface of one end of the nozzle body (21) close to the injection portion (22), the injection portion (22) extending out of the nozzle body (21), and the injection portion (22) being provided with a first fuel injection hole (221), the first fuel injection hole (221) being used for injecting a first fuel into a combustion chamber.

2. The injector assembly according to claim 1, wherein: The sealing surface (11) is conical, and the nozzle body (21) includes a plurality of conical or spherical matching surfaces (211), and the plurality of sealing surfaces (11) are tightly fitted with the plurality of matching surfaces (211).

3. The injector assembly according to claim 2, wherein: Of any two adjacent sealing surfaces (11), the inner diameter of the sealing surface (11) close to the injection portion (22) is not greater than the inner diameter of the sealing surface (11) away from the injection portion (22).

4. The injector assembly according to claim 1, wherein: The injector bushing (1) further comprises a connecting surface (12), any two adjacent sealing surfaces (11) are connected via the connecting surface (12), and the connecting surface (12) is clearance-matched with the outer surface of the nozzle body (21).

5. The injector assembly according to claim 4, characterized in that The connecting surface (12) is cylindrical.

6. The injector assembly according to any one of claims 1 to 5, characterized in that The number of the sealing surfaces (11) is three or more.

7. An engine, characterized in that: The invention comprises a cylinder head (3) and the injector assembly according to any one of claims 1 to 6, wherein the injector bushing (1) is embedded in the cylinder head (3), and the injection portion (22) extends into the combustion chamber of the engine.

8. The engine according to claim 7, characterized in that The injector bushing (1) is threadedly connected to the cylinder head (3).

9. The engine according to claim 7, characterized in that Along the centerline direction of the nozzle (2), the injector bushing (1) abuts against the cylinder head (3), and one end of the injector bushing (1) close to the injection portion (22) is retracted into the cylinder head (3).

10. The engine according to claim 7, characterized in that A coolant flow channel (31) is provided in the cylinder head (3), and the coolant flow channel (31) surrounds the outer periphery of the injector bushing (1).

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