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 a cylinder cover and an ejector, the cylinder cover is provided with a mounting hole, and the cylinder cover is provided with a cylinder cover bottom surface used for being matched with a cylinder body; the bottom end of the ejector penetrates through the mounting hole and is located below the bottom face of the cylinder cover. The bottom end of the ejector is provided with a first fuel injection hole and a second fuel injection hole located above the first fuel injection hole. In the direction of the center line of the injector, the distance between the center of the tail end of the first fuel injection hole and the bottom face of a cylinder cover is L1, the distance between the center of the tail end of the second fuel injection hole and the bottom face of the cylinder cover is L2, the ratio of L2 to L1 ranges from 1.7 to 1.8, and the size, protruding out of the bottom face of the cylinder cover relative to the first fuel injection hole, of the second fuel injection hole can be effectively reduced; furthermore, the contact area of the ejector and high-temperature gas in the combustion chamber is reduced, the temperature of the ejector is reduced, and carbon deposition is prevented from being easily formed in the gas spraying hole and the oil spraying hole.

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] Dual-fuel engines typically utilize HPDI (High Pressure Direct Injection) technology to improve fuel substitution rates, reaching up to 95%, resulting in superior power, fuel economy, and emissions. Dual-fuel engines are fueled by injecting a fuel gas (such as natural gas) directly into the combustion chamber via a dual-fuel injector. A pilot amount of liquid fuel (such as diesel) is then used to trigger combustion of the gaseous fuel, driving the engine.

[0003] In the prior art, dual-fuel injectors adopt a nested structure, the diameter of the injector is relatively large, and an air jet hole and an oil injection hole need to be provided at the end of the injector at the same time. The air jet hole and the oil injection hole are both located outside the cylinder head and extend into the combustion chamber. The air jet hole is located above the oil injection hole. For different types of dual-fuel injectors, the distance between the injector's air jet hole and the cylinder head is not much different. However, in the prior art, the oil injection hole of the dual-fuel injector protrudes from the cylinder head relative to the air jet hole, resulting in a larger contact area between the injector and the high-temperature gas in the combustion chamber, which easily causes the temperature of the injector to be high, and carbon deposits are easily formed in the air jet hole and the oil injection hole. Utility Model Content

[0004] The purpose of the utility model is to provide an injector assembly and an engine, so as to reduce the size of the injector's oil injection hole protruding from the cylinder head relative to the air injection hole, thereby reducing the temperature of the injector.

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

[0006] A cylinder head is provided with a mounting hole, and the cylinder head has a cylinder head bottom surface for matching with the cylinder block;

[0007] An injector is inserted into the mounting hole, and the bottom end of the injector extends out of the mounting hole and is located below the bottom surface of the cylinder head. The bottom end of the injector is provided with a first fuel injection hole for injecting a first fuel, and a second fuel injection hole for injecting a second fuel; along the centerline direction of the injector, the first fuel injection hole is located above the second fuel injection hole, the distance between the center of the end of the first fuel injection hole and the bottom surface of the cylinder head is L1, the distance between the center of the end of the second fuel injection hole and the bottom surface of the cylinder head is L2, and the ratio of L2 to L1 is between 1.7 and 1.8.

[0008] As a preferred technical solution of the injector assembly, the ratio of L2 to L1 is equal to 1.7, 1.75 or 1.8.

[0009] As an optimal technical solution of the injector assembly, the injector includes a needle valve core, a needle valve body sleeved on the needle valve core, and an injector body sleeved on the needle valve body, the first fuel injection hole is arranged on the injector body, and the second fuel injection hole is arranged on the needle valve body.

[0010] As a preferred technical solution of the injector assembly, the injector also includes a first supply oil circuit arranged between the injector body and the needle valve body, and an extended oil circuit connecting the first supply oil circuit and the first fuel injection hole, and the extended oil circuit is a first oil groove arranged on the outer peripheral surface of the needle valve body.

[0011] As a preferred technical solution of the injector assembly, the injector also includes a first supply oil circuit arranged between the injector body and the needle valve body, and an extended oil circuit connecting the first supply oil circuit and the first fuel injection hole, and the extended oil circuit is a second oil groove arranged on the inner surface of the injector body.

[0012] As a preferred technical solution of the injector assembly, the injector also includes a first supply oil circuit arranged between the injector body and the needle valve body, and an extended oil circuit connecting the first supply oil circuit and the first fuel injection hole, and the extended oil circuit is an oil hole arranged on the inner surface of the injector body.

[0013] As a preferred technical solution of the injector assembly, the injector further includes a second oil supply path provided between the needle valve body and the needle valve core, and an oil storage chamber provided in the needle valve body, the oil storage chamber being communicated with the second fuel injection hole.

[0014] As a preferred technical solution of the injector assembly, the injector assembly further includes an injector bushing, which is sleeved on the injector body and embedded in the mounting hole.

[0015] As a preferred technical solution of the injector assembly, the cylinder head is provided with a coolant flow channel surrounding the injector bushing.

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

[0017] The injector assembly includes a cylinder head and an injector, the cylinder head is provided with a mounting hole, and the cylinder head has a cylinder head bottom surface for cooperating with the cylinder block; the injector is passed through the mounting hole, and the bottom end of the injector extends out of the mounting hole and is located below the bottom surface of the cylinder head, the bottom end of the injector is provided with a first fuel injection hole for injecting a first fuel, and a second fuel injection hole for injecting a second fuel, and the first fuel injection hole is located above the second fuel injection hole; along the center line direction of the injector, the distance between the center of the end of the first fuel injection hole and the bottom surface of the cylinder head is L1, and the distance between the center of the end of the second fuel injection hole and the bottom surface of the cylinder head is L2, and the ratio of L2 to L1 is between 1.7 and 1.8. The injector assembly provided in this embodiment can effectively reduce the size of the second fuel injection hole protruding from the bottom surface of the cylinder head relative to the first fuel injection hole by setting the ratio of the distance between the second fuel injection hole and the bottom surface of the cylinder head to the distance between the first fuel injection hole and the bottom surface of the cylinder head between 1.7 and 1.8, thereby reducing the contact area between the injector and the high-temperature gas in the combustion chamber, and reducing the temperature of the injector, thereby avoiding the formation of carbon deposits in the injection hole and the oil injection hole.

[0018] On the other hand, the utility model provides an engine, comprising a cylinder block, a piston and an injector assembly according to any of the above-mentioned schemes, wherein the piston is slidably arranged on the cylinder block, and the cylinder head is covered on the cylinder block. When the piston moves to the top dead center of the cylinder block, the piston and the cylinder head form a combustion chamber, and the bottom end of the injector is located in the combustion chamber.

[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 reduce the contact area between the injector and the high-temperature gas in the combustion chamber, ensure the reliability of the injector operation, and further ensure the reliable operation of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a first structural schematic diagram of the injector assembly in an embodiment of the present utility model;

[0022] Figure 2 This is a second structural schematic diagram of the injector assembly in an embodiment of the present utility model;

[0023] Figure 3 This is a third structural schematic diagram of the injector assembly in an embodiment of the present utility model.

[0024] In the picture:

[0025] 1. Cylinder head; 11. Mounting hole; 12. Cylinder head bottom; 13. Coolant flow channel;

[0026] 2. Injector; 21. Needle valve core; 22. Needle valve body; 221. Second fuel injection hole; 23. Injector body; 231. First fuel injection hole; 24. First oil supply path; 25. Extended oil path; 26. Second oil supply path; 27. Oil storage chamber;

[0027] 3. Injector bushing. 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] In the prior art, dual-fuel injectors adopt a nested structure, the diameter of the injector is relatively large, and an air jet hole and an oil injection hole need to be provided at the end of the injector at the same time. The air jet hole and the oil injection hole are both located outside the cylinder head and extend into the combustion chamber. The air jet hole is located above the oil injection hole. For different types of dual-fuel injectors, the distance between the injector's air jet hole and the cylinder head is not much different. However, in the prior art, the oil injection hole of the dual-fuel injector protrudes from the cylinder head relative to the air jet hole, resulting in a larger contact area between the injector and the high-temperature gas in the combustion chamber, which easily causes the temperature of the injector to be high, and carbon deposits are easily formed in the air jet hole and the oil injection hole.

[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 a cylinder head 1 and an injector 2. The cylinder head 1 is provided with a mounting hole 11, and the cylinder head 1 has a cylinder head bottom surface 12 for mating with the cylinder block; the injector 2 is inserted into the mounting hole 11, and the bottom end of the injector 2 extends out of the mounting hole 11 and is located below the cylinder head bottom surface 12. The bottom end of the injector 2 is provided with a first fuel injection hole 231 for injecting a first fuel, and a second fuel injection hole 221 for injecting a second fuel. The first fuel injection hole 231 is located above the second fuel injection hole 221 and along the centerline of the injector 2; the distance between the center of the end of the first fuel injection hole 231 and the cylinder head bottom surface 12 is L1, and the distance between the center of the end of the second fuel injection hole 221 and the cylinder head bottom surface 12 is L2, and the ratio of L2 to L1 is between 1.7 and 1.8. The injector assembly provided in this embodiment can effectively reduce the size of the second fuel injection hole 221 protruding from the cylinder head bottom surface 12 relative to the first fuel injection hole 231 by setting the ratio of the distance between the second fuel injection hole 221 and the cylinder head bottom surface 12 to the distance between the first fuel injection hole 231 and the cylinder head bottom surface 12 between 1.7 and 1.8, so as to reduce the contact area between the injector and the high-temperature gas in the combustion chamber, thereby reducing the temperature of the injector and avoiding the formation of carbon deposits in the fuel injection hole.

[0035] It should be noted that the distance between the second fuel injection hole 221 and the cylinder head bottom surface 12 can be set according to industry standards and specific engine models and can be a standard value.

[0036] In this embodiment, the distance between the center of the distal end of the first fuel injection hole 231 and the cylinder head bottom surface 12 specifically refers to the distance between the center of the end of the first fuel injection hole 231 communicating with the combustion chamber and the cylinder head bottom surface 12 in the center direction of the distal end of the injector 2. The distance between the center of the distal end of the second fuel injection hole 221 and the cylinder head bottom surface 12 specifically refers to the distance between the center of the end of the second fuel injection hole 221 communicating with the combustion chamber and the cylinder head bottom surface 12 in the center direction of the distal end of the injector 2.

[0037] In this embodiment, the first fuel injection hole 231 is used to inject gaseous fuel (such as natural gas), and the second fuel injection hole 221 is used to inject liquid fuel (such as diesel). In other embodiments, the fuels injected by the first fuel injection hole 231 and the second fuel injection hole 221 can also be set according to actual needs.

[0038] Optionally, the ratio of L2 to L1 is equal to 1.7, 1.75 or 1.8. In other embodiments, the ratio of L2 to L1 can also be set to 1.71, 1.72, 1.73, 1.74, 1.76, 1.77, 1.78 or 1.79, etc.

[0039] Optionally, the injector 2 includes a needle valve core 21, a needle valve body 22, and an injector body 23. The needle valve body 22 is sleeved on the needle valve core 21, and the injector body 23 is sleeved on the needle valve body 22. The first fuel injection hole 231 is provided in the injector body 23, and the second fuel injection hole 221 is provided in the needle valve body 22. Specifically, in this embodiment, the lower end of the injector 2 is formed by the bottom end of the needle valve core 21, the bottom end of the needle valve body 22, and the bottom end of the injector body 23, and all three extend into the combustion chamber.

[0040] Alternatively, see Figure 1 The injector 2 further includes a first oil supply passage 24 disposed between the injector body 23 and the needle valve body 22, and an extended oil passage 25 connecting the first oil supply passage 24 and the first fuel injection hole 231. The extended oil passage 25 is a first oil groove disposed on the outer peripheral surface of the needle valve body 22. The needle valve body 22 is movable relative to the injector body 23 and has a first open position and a first closed position. When the needle valve body 22 is in the first open position, the first oil supply passage 24 is opened, at which point the needle valve body 22 and the injector body 23 are spaced apart. When the needle valve body 22 is in the first closed position, the first oil supply passage 24 is closed, at which point the needle valve body 22 and the injector body 23 are partially sealed together, and the first oil supply passage 24 is cut off.

[0041] As an alternative, please refer to Figure 2The injector 2 also includes a first oil supply passage 24 arranged between the injector body 23 and the needle valve body 22, and an extended oil passage 25 connecting the first oil supply passage 24 and the first fuel injection hole 231. The extended oil passage 25 is an oil hole arranged on the inner surface of the injector body 23.

[0042] As an alternative, please refer to Figure 3 The injector 2 also includes a first oil supply passage 24 arranged between the injector body 23 and the needle valve body 22, and an extended oil passage 25 connecting the first oil supply passage 24 and the first fuel injection hole 231. The extended oil passage 25 is a second oil groove arranged on the inner surface of the injector body 23.

[0043] It is understood that the first oil supply passage 24 is not limited to conveying liquid oil, and is specifically configured according to the actual situation of the first fuel. Specifically, this embodiment exemplifies a solution in which the first oil supply passage 24 is used to convey natural gas.

[0044] Optionally, the injector 2 further includes a second oil supply passage 26 disposed between the needle valve body 22 and the needle valve core 21, and an oil storage chamber 27 disposed in the needle valve body 22, the oil storage chamber 27 being in communication with the second fuel injection hole 221. The needle valve core 21 is movable relative to the needle valve body 22, having a second open position and a second closed position. When the needle valve core 21 is in the second open position, the second oil supply passage 26 is opened, with the needle valve core 21 and the needle valve body 22 spaced apart. When the needle valve core 21 is in the second closed position, the second oil supply passage 26 is closed, with the needle valve core 21 and the needle valve body 22 partially sealingly engaged, thereby cutting off the second oil supply passage 26.

[0045] In this embodiment, the second oil supply passage 26 is exemplarily provided as a solution for conveying diesel fuel. However, the second oil supply passage 26 is not limited to conveying liquid oil, and is specifically configured according to the actual situation of the second fuel.

[0046] Optionally, the injector assembly further includes an injector bushing 3, which is sleeved on the injector body 23 and embedded in the mounting hole 11. The injector bushing 3 is made of metal and is used to exchange heat with the injector 2 to transfer the high temperature of the injector 2 to the cylinder head 1, thereby reducing the temperature of the injector 2.

[0047] Optionally, the cylinder head 1 is provided with a coolant flow channel 13 surrounding the injector bushing 3. The coolant flowing in the coolant flow channel 13 can directly reduce the temperature of the cylinder head 1 and the injector bushing 3, thereby improving the cooling effect on the injector 2.

[0048] This embodiment also provides an engine, which includes a cylinder block (not shown in the drawings), a piston (not shown in the drawings) and the above-mentioned injector assembly, the piston is slidably arranged in the cylinder block, and the cylinder head 1 is covered on the cylinder block. When the piston moves to the top dead center of the cylinder block, the piston and the cylinder head 1 are arranged to form a combustion chamber, and the bottom end of the injector 2 is located in the combustion chamber. Specifically, the injector 2 injects the first fuel through the first fuel injection hole 231 and the second fuel through the second fuel injection hole 221 into the combustion chamber for combustion. Since the portion of the injector 2 protruding from the bottom surface 12 of the cylinder head and extending into the combustion chamber is relatively reduced, the temperature of the injector 2 can be reduced, and it has higher reliability, thereby improving the reliability of the engine operation. Among them, the piston moves in the cylinder block, 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 rotation center of the crankshaft.

[0049] 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: The injector assembly comprises: A cylinder head (1) is provided with a mounting hole (11), and the cylinder head (1) has a cylinder head bottom surface (12) for matching with the cylinder block; An injector (2) is provided in the mounting hole (11), and the bottom end of the injector (2) extends out of the mounting hole (11) and is located below the bottom surface (12) of the cylinder head. The bottom end of the injector (2) is provided with a first fuel injection hole (231) for injecting a first fuel, and a second fuel injection hole (221) for injecting a second fuel, wherein the first fuel injection hole (231) is located above the second fuel injection hole (221); along the center line direction of the injector (2), the distance between the center of the end of the first fuel injection hole (231) and the bottom surface (12) of the cylinder head is L1, and the distance between the center of the end of the second fuel injection hole (221) and the bottom surface (12) of the cylinder head is L2, and the ratio of L2 to L1 is between 1.7 and 1.

8.

2. The injector assembly according to claim 1, wherein: The ratio of L2 to L1 is equal to 1.7, 1.75 or 1.

8.

3. The injector assembly according to claim 1, wherein: The injector (2) comprises a needle valve core (21), a needle valve body (22) sleeved on the needle valve core (21), and an injector body (23) sleeved on the needle valve body (22); the first fuel injection hole (231) is provided in the injector body (23), and the second fuel injection hole (221) is provided in the needle valve body (22).

4. The injector assembly according to claim 3, wherein: The injector (2) further includes a first oil supply passage (24) provided between the injector body (23) and the needle valve body (22), and an extended oil passage (25) connecting the first oil supply passage (24) and the first fuel injection hole (231), wherein the extended oil passage (25) is a first oil groove provided on the outer peripheral surface of the needle valve body (22).

5. The injector assembly according to claim 3, wherein: The injector (2) further includes a first oil supply passage (24) provided between the injector body (23) and the needle valve body (22), and an extended oil passage (25) communicating with the first oil supply passage (24) and the first fuel injection hole (231), wherein the extended oil passage (25) is a second oil groove provided on the inner surface of the injector body (23).

6. The injector assembly according to claim 3, wherein: The injector (2) further includes a first oil supply passage (24) provided between the injector body (23) and the needle valve body (22), and an extended oil passage (25) communicating with the first oil supply passage (24) and the first fuel injection hole (231), wherein the extended oil passage (25) is an oil hole provided on the inner surface of the injector body (23).

7. The injector assembly according to claim 3, wherein: The injector (2) further comprises a second oil supply passage (26) arranged between the needle valve body (22) and the needle valve core (21), and an oil storage chamber (27) arranged in the needle valve body (22), wherein the oil storage chamber (27) is communicated with the second fuel injection hole (221).

8. The injector assembly according to any one of claims 3 to 7, characterized in that: The injector assembly further comprises an injector bushing (3), wherein the injector bushing (3) is sleeved on the injector body (23), and the injector bushing (3) is embedded in the mounting hole (11).

9. The injector assembly according to claim 8, wherein: The cylinder head (1) is provided with a coolant flow channel (13) surrounding the injector bushing (3).

10. An engine, characterized in that: The invention comprises a cylinder body, a piston and an injector assembly according to any one of claims 1 to 9, wherein the piston is slidably arranged on the cylinder body, and the cylinder head (1) is covered on the cylinder body. When the piston moves to the top dead center of the cylinder body, the piston and the cylinder head (1) enclose a combustion chamber, and the bottom end of the injector (2) is located in the combustion chamber.

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