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, a nozzle and a first sealing ring, and the ejector bushing is used for being installed in a cylinder cover; the nozzle comprises a nozzle body and a spraying end connected to the nozzle body, the nozzle body is sleeved with the ejector bushing, the ejector bushing is in sealing fit with the end, away from the spraying end, of the nozzle body, the spraying end is located outside the ejector bushing and used for stretching into the combustion chamber, and the ejector bushing, the first sealing ring and the nozzle body are sequentially nested and are arranged in the vertical direction. The two ends of the first sealing ring are attached to the nozzle body and the ejector bushing in a sealed mode respectively, high-temperature gas is prevented from entering the space between the nozzle body and the ejector bushing, the contact area between the nozzle and the high-temperature gas is reduced, the reliability of the nozzle is improved, the first sealing ring is made of materials capable of being extruded to deform, plastic deformation of the nozzle or the ejector bushing can be made up, and the service life of the nozzle is prolonged. And the sealing effect between the ejector bushing and the nozzle main body is ensured.

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 a crucial component for controlling the amount of fuel injected into an engine and plays a vital role in the proper operation of the engine. However, the injector nozzle is constantly exposed to the high-temperature gases within the combustion chamber. To prevent excessive nozzle temperatures from forming carbon deposits within the nozzle's fuel injection holes, the injector assemblies provided in related art typically utilize a tapered surface to seal the injector bushing and the front end of the nozzle. However, after the injector assembly is assembled, the nozzle or injector bushing is susceptible to plastic deformation. Repeated assembly and use of the injector assembly can easily lead to failure of the seal between the injector bushing and the nozzle front end, potentially causing high-temperature gases to enter between the injector bushing and the nozzle, resulting in elevated nozzle temperatures. Utility Model Content

[0003] The purpose of the present utility model is to provide an injector assembly to solve the problem in the related art that after the injector assembly is assembled, the nozzle or the injector bushing is prone to plastic deformation, which leads to failure of the seal between the injector bushing and the nozzle when the injector assembly is repeatedly assembled.

[0004] In one aspect, the present invention provides an injector assembly, comprising:

[0005] Injector bushing, for installation in the cylinder head;

[0006] A nozzle, comprising a nozzle body and an injection end connected to the nozzle body, wherein the injector bushing is sleeved on the nozzle body, and the injector bushing is sealingly engaged with an end of the nozzle away from the injection end, the injection end is located outside the injector bushing, and the injection end is configured to extend into the combustion chamber;

[0007] A first sealing ring, the first sealing ring is located in the injector bushing, the first sealing ring is sleeved on one end of the nozzle body close to the injection end, and along the vertical direction, the two ends of the first sealing ring are respectively sealed with the nozzle body and the injector bushing, the first sealing ring is made of heat-conductive material, and the first sealing ring can be squeezed and deformed.

[0008] As a preferred technical solution of the injector assembly, the first sealing ring and the nozzle body are clearance-fitted; or, the first sealing ring and the nozzle body are transition-fitted; or, the first sealing ring and the nozzle body are interference-fitted.

[0009] As a preferred technical solution of the injector assembly, the first sealing ring is clearance-fitted with the injector bushing.

[0010] As a preferred technical solution of the injector assembly, the inner surface of the injector bushing is provided with a first protrusion, and the outer peripheral surface of the nozzle body is provided with a second protrusion;

[0011] In the vertical direction, the second protrusion is located above the first sealing ring, the first sealing ring is located above the first protrusion, the upper end of the first sealing ring contacts and seals with the second protrusion, and the lower end of the first sealing ring contacts and seals with the first protrusion.

[0012] As a preferred technical solution for the injector assembly, the first sealing ring includes a first sealing end face located at the upper end and a second sealing end face located at the lower end, the first sealing end face contacts and seals with the second raised surface, and the second sealing end face contacts and seals with the first raised line.

[0013] As a preferred technical solution of the injector assembly, the outer diameter of the injection end is not larger than the inner diameter of the first sealing ring.

[0014] As an optimal technical solution for the injector assembly, the injector assembly further includes a second sealing ring, which is sleeved on the end of the nozzle body away from the injection end, and along the vertical direction, the two ends of the second sealing ring are respectively sealed with the nozzle body and the injector bushing, so that the injector bushing is sealed with the end of the nozzle body away from the injection end.

[0015] The beneficial effects of the utility model are:

[0016] The utility model provides an injector assembly, which includes an injector bushing, a nozzle and a first sealing ring, the injector bushing is used to be installed in a cylinder head; the nozzle includes a nozzle body and an injection end connected to the nozzle body, the injector bushing is sleeved on the nozzle body, and the injector bushing is sealed with an end of the nozzle body away from the injection end, the injection end is located outside the injector bushing, and the injection end is used to extend into a combustion chamber; the first sealing ring is located in the injector bushing, the first sealing ring is sleeved on an end of the nozzle body close to the injection end, and along the vertical direction, the two ends of the first sealing ring are sealed with the nozzle body and the injector bushing respectively, the first sealing ring is made of heat-conducting material, and the first sealing ring can be squeezed and deformed. The nozzle body and the injector bushing are sealed and fitted at both ends of the first sealing ring in the vertical direction, so as to realize the sealing of the injector bushing and the nozzle body near the injection end, avoid the high-temperature gas from entering between the nozzle body and the injector bushing, reduce the contact area between the nozzle and the high-temperature gas, and thus reduce the temperature of the nozzle, and ensure the reliability of the nozzle operation; and, even if the nozzle or the injector bushing is plastically deformed due to reassembly, since the first sealing ring can be squeezed and deformed, the first sealing ring has plasticity, which can compensate for the plastic deformation of the nozzle or the injector bushing, and thus ensure the sealing effect of the injector bushing and the nozzle body near the injection end.

[0017] 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 end extends into the combustion chamber of the engine.

[0018] As a preferred technical solution of the engine, the injector bushing is threadedly connected to the cylinder head.

[0019] As a preferred technical solution of the engine, the cylinder head is provided with a coolant flow channel surrounding the injector bushing.

[0020] The beneficial effects of the utility model are:

[0021] The utility model provides an engine, which includes the above-mentioned injector assembly, can ensure the reliability of the nozzle operation, and compensate for the plastic deformation of the nozzle or the injector bushing through a first sealing ring with plasticity, so as to ensure that the sealing effect is not affected even if the nozzle or the injector bushing is reassembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the local structure of the engine in an embodiment of the present utility model.

[0023] In the picture:

[0024] 1. Injector bushing; 11. First protrusion;

[0025] 2. Nozzle; 21. Nozzle body; 211. Second protrusion; 22. Spray end;

[0026] 3. First sealing ring; 31. First sealing end face; 32. Second sealing end face;

[0027] 4. Second sealing ring;

[0028] 5. Cylinder head; 51. Coolant flow channel. DETAILED DESCRIPTION

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] To achieve a seal between the injector bushing and the nozzle tip, the injector assembly typically mates with the nozzle tip via a tapered surface. However, after the injector assembly is assembled, the nozzle or injector bushing is susceptible to plastic deformation. Repeated assembly and use of the injector assembly can lead to failure of the seal between the injector bushing and the nozzle tip, causing high-temperature gas to enter between the injector bushing and the nozzle, resulting in high nozzle temperatures. Understandably, when the nozzle or injector bushing undergoes plastic deformation, it can be difficult to align the tapered surfaces of the nozzle and injector bushing, thus compromising the sealing effect.

[0034] In this regard, an injector assembly is provided in this embodiment to solve the above problems.

[0035] Please refer to Figure 1 The injector assembly includes an injector bushing 1, a nozzle 2 and a first sealing ring 3. The injector bushing 1 is used to be installed in the cylinder head 5; the nozzle 2 includes a nozzle body 21 and an injection end 22 connected to the nozzle body 21. The injector bushing 1 is sleeved on the nozzle body 21, and the injector bushing 1 and the end of the nozzle body 21 away from the injection end 22 are sealed. The injection end 22 is located outside the injector bushing 1 and is used to extend into the combustion chamber; the first sealing ring 3 is located in the injector bushing 1, and the first sealing ring 3 is sleeved on the end of the nozzle body 21 close to the injection end 22, and is vertically (such as Figure 1 The two ends of the first sealing ring 3 are respectively sealed with the nozzle body 21 and the injector bushing 1. The first sealing ring 3 is made of heat-conducting material and can be squeezed and deformed.

[0036] The injector assembly provided in this embodiment seals the nozzle body 21 and the injector bushing 1 at both ends along the vertical direction through the first sealing ring 3, thereby achieving a seal between the injector bushing 1 and the end of the nozzle body 21 near the injection end 22. This prevents high-temperature gas from entering between the nozzle body 21 and the injector bushing 1, reduces the contact area between the nozzle 2 and the high-temperature gas, and thus reduces the temperature of the nozzle 2, ensuring the reliability of the nozzle 2. Furthermore, even if reassembly causes plastic deformation of the nozzle 2 or the injector bushing 1, the first sealing ring 3 can be squeezed and deformed, making the first sealing ring 3 plastic, and can compensate for the plastic deformation of the nozzle 2 or the injector bushing 1, thereby ensuring the sealing effect between the injector bushing 1 and the end of the nozzle body 21 near the injection end 22.

[0037] Specifically, the first sealing ring 3 can be made of copper. In other embodiments, it can also be made of other materials such as silver.

[0038] In this embodiment, the centerline of the nozzle 2 and the centerline of the injector bushing 1 are both vertical. The injection end 22 is provided with a plurality of fuel injection holes for injecting fuel into the combustion chamber. The plurality of fuel injection holes are evenly spaced along the circumference of the nozzle 2. The plurality of fuel injection holes can all be used to inject the same fuel, such as diesel or natural gas, or they can be used to inject two different fuels, such as with some fuel injection holes used to inject a first fuel (such as natural gas) and others used to inject a second fuel (such as diesel).

[0039] Optionally, the first sealing ring 3 and the nozzle body 21 have a clearance fit, facilitating replacement of the nozzle 2 or the first sealing ring 3. In other embodiments, the first sealing ring 3 and the nozzle body 21 have an interference fit. In this case, the first sealing ring 3 and the nozzle 2 can be installed integrally, ensuring the relative positional stability between the first sealing ring 3 and the nozzle 2. Alternatively, the first sealing ring 3 and the nozzle body 21 can have a transition fit, ensuring a relatively stable positional relationship between the two and facilitating maintenance and repair of either.

[0040] Optionally, the first sealing ring 3 is clearance-fitted with the injector bushing 1 , so as to facilitate disassembly, assembly and maintenance of the injector bushing 1 .

[0041] Optionally, a first protrusion 11 is provided on the inner surface of the injector bushing 1, and a second protrusion 211 is provided on the outer circumference of the nozzle body 21. Vertically, the second protrusion 211 is located above the first sealing ring 3, which is then located above the first protrusion 11. The upper end of the first sealing ring 3 contacts and seals with the second protrusion 211, while the lower end of the first sealing ring 3 contacts and seals with the first protrusion 11. This arrangement allows the first protrusion 11 and the second protrusion 211 to vertically restrict the position of the first sealing ring 3, thereby ensuring a stable relative position of the first sealing ring 3 to the injector bushing 1 and the nozzle 2.

[0042] Optionally, the first sealing ring 3 includes a first sealing end face 31 located at the upper end, and a second sealing end face 32 located at the lower end, the first sealing end face 31 is in surface contact and sealing cooperation with the second protrusion 211, and the second sealing end face 32 is in line contact and sealing cooperation with the first protrusion 11. With such an arrangement, by making the second sealing end face 32 and the first protrusion 11 in line contact and sealing, the plastic deformation of the nozzle 2 or the injector bushing 1 can be effectively compensated. Specifically, in this embodiment, the second sealing end face 32 is a plane perpendicular to the vertical direction, the first protrusion 11 has a conical surface, the center line of the conical surface is along the vertical direction, and the first protrusion 11 cooperates with the second sealing end face 32 through the conical surface to achieve line contact sealing. In other embodiments, the second sealing end face 32 can also be a spherical surface, and the line contact sealing between the two can also be achieved by cooperating with the spherical surface and the conical surface.

[0043] Optionally, the outer diameter of the injection end 22 is not greater than the inner diameter of the first sealing ring 3. This arrangement facilitates passing the nozzle 2 through the first sealing ring 3 from top to bottom during assembly.

[0044] Optionally, the injector assembly further includes a second sealing ring 4, which is sleeved over the end of the nozzle body 21 away from the injection end 22. Vertically, the two ends of the second sealing ring 4 are in sealing contact with the nozzle body 21 and the injector bushing 1, respectively, ensuring a sealed fit between the injector bushing 1 and the end of the nozzle body 21 away from the injection end 22. The provision of the second sealing ring 4 adds a heat transfer path between the injector bushing 1 and the nozzle 2, improving heat dissipation from the nozzle 2 and preventing fuel leakage between the injector bushing 1 and the top of the nozzle body 21.

[0045] It should be noted that the injector bushing 1 is made of metal material and the second sealing ring 4 is also made of copper. Both have good heat transfer capabilities. The injector bushing 1 can simultaneously transfer heat with the nozzle 2 through the first sealing ring 3 and the second sealing ring 4, and then transfer the heat of the nozzle 2 to the cylinder head 5 to achieve cooling of the nozzle 2.

[0046] Optionally, the injector bushing 1 and the nozzle 2 are clearance-fitted with each other to facilitate assembly and maintenance of the nozzle 2 and the injector bushing 1 .

[0047] This embodiment also provides an engine comprising a cylinder head 5 and the aforementioned injector assembly. An injector bushing 1 is embedded in the cylinder head 5, with an injection end 22 extending into the engine's combustion chamber. The injection end 22 of the nozzle 2 injects fuel into the combustion chamber through a fuel injection hole. The fuel burns within the combustion chamber, generating high-temperature gas. This high-temperature gas contacts the injection end 22. The first sealing ring 3 prevents the high-temperature gas from entering between the nozzle body 21 and the injector bushing 1, thereby reducing the temperature of the nozzle 2 and ensuring its operational reliability.

[0048] In this embodiment, the engine further includes a cylinder block (not shown in the drawings) and a piston (not shown) slidably mounted within the cylinder block. A cylinder head 5 is mounted on the cylinder block. When the piston reaches top dead center, a combustion chamber is defined between the top surface of the piston and the cylinder head 5. The highest point reached by the top surface of the piston within the cylinder block is called top dead center. At this point, the top surface of the piston is farthest from the center of rotation of the crankshaft.

[0049] Optionally, the injector bushing 1 is threadedly connected to the cylinder head 5. This arrangement facilitates assembly and disassembly between the injector bushing 1 and the cylinder head 5.

[0050] Optionally, the cylinder head 5 is provided with a coolant flow channel 51 surrounding the injector bushing 1. The coolant flow channel 51 is provided to facilitate heat exchange between the coolant and the injector bushing 1, so that the injector bushing 1 can dissipate heat from the nozzle 2.

[0051] 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) for installation in a cylinder head (5); The nozzle (2) comprises a nozzle body (21) and an injection end (22) connected to the nozzle body (21); the injector sleeve (1) is sleeved on the nozzle body (21), and the injector sleeve (1) is sealed with an end of the nozzle (2) away from the injection end (22); the injection end (22) is located outside the injector sleeve (1), and the injection end (22) is used to extend into the combustion chamber; A first sealing ring (3) is located in the injector bushing (1). The first sealing ring (3) is sleeved on one end of the nozzle body (21) close to the injection end (22), and along the vertical direction, the two ends of the first sealing ring (3) are sealed and fitted with the nozzle body (21) and the injector bushing (1) respectively. The first sealing ring (3) is made of a heat-conducting material and can be squeezed and deformed.

2. The injector assembly according to claim 1, wherein: The first sealing ring (3) and the nozzle body (21) are clearance-fitted; or, the first sealing ring (3) and the nozzle body (21) are transition-fitted; or, the first sealing ring (3) and the nozzle body (21) are interference-fitted.

3. The injector assembly according to claim 1, wherein: The first sealing ring (3) is clearance-fitted with the injector bushing (1).

4. The injector assembly according to claim 1, wherein: The inner surface of the injector bushing (1) is provided with a first protrusion (11), and the outer peripheral surface of the nozzle body (21) is provided with a second protrusion (211); In the vertical direction, the second protrusion (211) is located above the first sealing ring (3), and the first sealing ring (3) is located above the first protrusion (11). The upper end of the first sealing ring (3) contacts and seals with the second protrusion (211), and the lower end of the first sealing ring (3) contacts and seals with the first protrusion (11).

5. The injector assembly according to claim 4, characterized in that The first sealing ring (3) includes a first sealing end face (31) located at the upper end and a second sealing end face (32) located at the lower end, wherein the first sealing end face (31) is in surface contact with the second protrusion (211) and is sealed, and the second sealing end face (32) is in line contact with the first protrusion (11) and is sealed.

6. The injector assembly according to claim 1, wherein: The outer diameter of the injection end (22) is no greater than the inner diameter of the first sealing ring (3).

7. The injector assembly according to any one of claims 1 to 6, characterized in that The injector assembly further comprises a second sealing ring (4), which is sleeved on an end of the nozzle body (21) away from the injection end (22), and in a vertical direction, two ends of the second sealing ring (4) are respectively sealed with the nozzle body (21) and the injector bushing (1), so that the injector bushing (1) is sealed with the end of the nozzle body (21) away from the injection end (22).

8. An engine, characterized in that: The invention comprises a cylinder head (5) and the injector assembly according to any one of claims 1 to 7, wherein the injector bushing (1) is embedded in the cylinder head (5), and the injection end (22) extends into the combustion chamber of the engine.

9. The engine according to claim 8, characterized in that The injector bushing (1) is threadedly connected to the cylinder head (5).

10. The engine according to claim 8, characterized in that The cylinder head (5) is provided with a coolant flow channel (51) surrounding the injector bushing (1).

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