Heat insulation part, ejector assembly and engine

Abstract

The utility model relates to the technical field of engines, and particularly discloses a heat insulation piece, an injector assembly and an engine, the heat insulation piece is used for covering an injection part of a nozzle, the injection part extends into a combustion chamber, and the injection part is provided with a first fuel injection hole used for injecting first fuel to the combustion chamber; the heat insulation piece comprises a heat insulation cover, the heat insulation cover is used for completely covering the outer surface of the injection part, the heat insulation cover is provided with a first communication hole and a second communication hole, one end of the first communication hole is used for being communicated with the first fuel injection hole, and the other end of the first communication hole is used for being communicated with the second fuel injection hole. The other end of the first communicating hole is communicated with a combustion chamber; one end of the second communicating hole is used for communicating with the second fuel injection hole, and the other end of the second communicating hole is used for communicating with the combustion chamber. The injection part is separated from flames in the combustion chamber through the heat insulation cover, the temperature of the injection part is reduced, carbon deposition in the fuel injection hole is avoided, and then it is guaranteed that the engine can operate normally.

Description

Technical Field

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

[0002] Some existing engines use a single fuel, while others use dual fuel. Taking dual-fuel engines as an example, dual-fuel engines typically utilize HPDI (High Pressure Direct Injection) technology to improve their fuel substitution rate, which can reach 95%, resulting in superior power, economy, and emissions. Dual-fuel engines are fueled by injecting 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 the combustion of the gas fuel, thereby driving the engine.

[0003] However, the nozzle end of the dual-fuel injector is directly exposed in the combustion chamber. Under high-temperature conditions, carbon deposits are prone to form on the nozzle's injection hole. Severe carbon deposits may clog the injection hole, affecting the normal injection of diesel and natural gas, and thus affecting the normal operation of the engine. Utility Model Content

[0004] The purpose of the utility model is to provide a heat insulation component, an injector assembly and an engine to solve the problem that the nozzle end of the injector is directly exposed to the combustion chamber and carbon deposits are easily generated in the injection hole of the nozzle under high temperature environment.

[0005] In the first aspect, the utility model provides a heat insulation member for covering an injection portion provided on a nozzle, the injection portion extending into a combustion chamber, and the injection portion is provided with a first fuel injection hole for injecting a first fuel into the combustion chamber, and a second fuel injection hole for injecting a second fuel into the combustion chamber, the heat insulation member includes a heat insulation cover, the heat insulation cover is used to completely cover the outer surface of the injection portion, the heat insulation cover is provided with a first connecting hole and a second connecting hole, one end of the first connecting hole is used to communicate with the first fuel injection hole, and the other end of the first connecting hole is used to communicate with the combustion chamber; one end of the second connecting hole is used to communicate with the second fuel injection hole, and the other end of the second connecting hole is used to communicate with the combustion chamber.

[0006] As a preferred technical solution of the heat insulation member, the nozzle further comprises a body portion for being embedded in the cylinder head, the body portion being connected to the injection portion and being located above the injection portion;

[0007] The heat insulating member further comprises a heat insulating sleeve connected to the heat insulating cover, the heat insulating sleeve being located above the heat insulating cover, the heat insulating sleeve being used to be sleeved on the main body, and the heat insulating sleeve being used to be embedded in the cylinder head.

[0008] As an optimal technical solution for the thermal insulation component, the second connecting hole is located above the first connecting hole, and the thermal insulation cover includes a first conical fitting surface, which is located between the first connecting hole and the second connecting hole, and is used to fit tightly with the outer surface of the injection portion.

[0009] As a preferred technical solution of the thermal insulation component, the thermal insulation sleeve includes a conical second fitting surface, the second fitting surface is located above the second connecting hole, and the second fitting surface is used to fit tightly with the outer surface of the main body.

[0010] The heat shield provided by the utility model has at least the following beneficial effects:

[0011] The heat insulating member includes a heat insulating cover, which is used to completely cover the outer surface of the injection portion. The heat insulating cover is provided with a first connecting hole and a second connecting hole. One end of the first connecting hole is used to communicate with the first fuel injection hole, and the other end of the first connecting hole is used to communicate with the combustion chamber; one end of the second connecting hole is used to communicate with the second fuel injection hole, and the other end of the second connecting hole is used to communicate with the combustion chamber. The first fuel can be injected into the combustion chamber through the first fuel injection hole on the injection portion and the first connecting hole on the heat insulating cover, and the second fuel can be injected into the combustion chamber through the second fuel injection hole on the injection portion and the second connecting hole on the heat insulating cover. When the fuel burns in the combustion chamber, under the protection of the heat insulating cover, the flame in the combustion chamber cannot directly contact the injection portion, thereby preventing high temperature from affecting the first fuel injection hole and the second fuel injection hole on the injection portion, thereby preventing carbon deposits from forming in the fuel injection holes, ensuring that the first fuel and the second fuel can be injected normally, and thus ensuring the normal operation of the engine.

[0012] In a second aspect, the present invention provides an injector assembly, the injector assembly comprising the thermal insulation member described in any of the above-mentioned solutions, the injector assembly further comprising a nozzle, the nozzle comprising an injection portion for extending into a combustion chamber, the injection portion being provided with a first fuel injection hole and a second fuel injection hole, the first fuel injection hole being used to inject a first fuel into the combustion chamber, the second fuel injection hole being used to inject a second fuel into the combustion chamber;

[0013] The heat shield completely covers the outer surface of the injection portion. The first communication hole is communicated with the first fuel injection hole, and the second communication hole is communicated with the second fuel injection hole.

[0014] As a preferred technical solution of the injector assembly, the center line of the first communicating hole coincides with the center line of the first fuel injection hole, and the aperture of the first communicating hole is not smaller than the aperture of the first fuel injection hole.

[0015] As a preferred technical solution of the injector assembly, the injection portion is provided with a plurality of first fuel injection holes, the heat shield is provided with a plurality of first communication holes, and the plurality of first fuel injection holes are connected to the plurality of first communication holes in a one-to-one correspondence.

[0016] As a preferred technical solution of the injector assembly, the center line of the second communicating hole coincides with the center line of the second fuel injection hole, and the aperture of the second communicating hole is not smaller than the aperture of the second fuel injection hole.

[0017] As a preferred technical solution of the injector assembly, the injection portion is provided with a plurality of second fuel injection holes, the heat shield is provided with a plurality of second communicating holes, and the plurality of second fuel injection holes are connected to the plurality of second communicating holes in a one-to-one correspondence.

[0018] The injector assembly provided by the utility model has at least the following beneficial effects:

[0019] The injector assembly includes a nozzle and the above-mentioned heat insulation component. Under the protection of the heat insulation cover, the flame in the combustion chamber cannot directly contact the injection part, thereby preventing high temperature from affecting the fuel injection hole on the injection part and preventing carbon deposits from forming in the fuel injection hole, ensuring that the first fuel and the second fuel can be injected normally, thereby ensuring that the engine can operate normally.

[0020] On the other hand, the present invention provides an engine, comprising the injector assembly of any of the above-mentioned schemes, the engine also comprising a cylinder head, the nozzle being passed through the cylinder head, and the injection portion extending into the combustion chamber of the engine, and the heat shield being located in the combustion chamber.

[0021] The engine provided by the utility model has at least the following beneficial effects:

[0022] The engine includes the above-mentioned injector assembly, and carbon deposits are not easily formed in the fuel injection holes of the nozzle, thereby ensuring the reliability of engine operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a cross-sectional view of an injector assembly in an embodiment of the present utility model;

[0024] Figure 2 It is a cross-sectional view of the local structure of the engine in an embodiment of the present utility model.

[0025] In the picture:

[0026] 1. Nozzle; 11. Injection portion; 111. First fuel injection hole; 112. Second fuel injection hole; 12. Body;

[0027] 2. Thermal insulation member; 21. Thermal insulation cover; 211. First communication hole; 212. Second communication hole; 213. First fitting surface; 22. Thermal insulation sleeve; 221. Second fitting surface; 222. Columnar portion; 223. Conical portion;

[0028] 3. Cylinder head;

[0029] 4. Piston;

[0030] 5. Combustion chamber;

[0031] 6. Bushing. 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] The nozzle end of the existing dual-fuel injector is directly exposed in the combustion chamber. Under high temperature environment, carbon deposits are prone to appear in the injection hole of the nozzle. When the carbon deposits are serious, the injection hole can be blocked, affecting the normal injection of diesel and natural gas, and thus affecting the normal operation of the engine.

[0037] In this regard, this embodiment provides a heat insulation component, an ejector assembly, and an engine to solve the above-mentioned problems.

[0038] Figure 1 is a cross-sectional view of the injector assembly. Figure 2 It is a cross-sectional view of the local structure of the engine, wherein: Figure 2 The cylinder head 3 and piston 4 are cut open, while the heat insulation 2 and nozzle 1 are not cut open. Figure 1 and Figure 2 The injector assembly includes a nozzle 1 and a heat insulation component 2.

[0039] The nozzle 1 includes an injection portion 11 for extending into the combustion chamber 5 . The injection portion 11 is provided with a first fuel injection hole 111 . The first fuel injection hole 111 is used to inject the first fuel into the combustion chamber 5 .

[0040] The heat insulating member 2 includes a heat insulating cover 21, which is provided on the injection portion 11 and completely covers the outer surface of the injection portion 11. The heat insulating cover 21 is provided with a first connecting hole 211, one end of the first connecting hole 211 is connected to the first fuel injection hole 111, and the other end of the first connecting hole 211 is used to communicate with the combustion chamber 5. In the injector assembly provided in this embodiment, the injection portion 11 of the nozzle 1 extends into the burner and the outer surface of the injection portion 11 is covered by the heat insulating cover 21. When injecting fuel, the first fuel can be injected into the combustion chamber 5 through the first fuel injection hole 111 on the injection portion 11 and the first connecting hole 211 on the heat insulating cover 21. When the fuel burns in the combustion chamber 5, under the protection of the heat insulating cover 21, the flame cannot directly contact the injection portion 11, thereby avoiding the influence of high temperature on the first fuel injection hole 111 on the injection portion 11 and avoiding the generation of carbon deposits in the first fuel injection hole 111, ensuring that the first fuel can be injected normally, and thus ensuring that the engine can operate normally.

[0041] The heat insulating member 2 can be made of heat insulating materials such as ceramics and dispersion-strengthened alloys.

[0042] Optionally, the center line of the first communication hole 211 coincides with the center line of the first fuel injection hole 111, and the aperture of the first communication hole 211 is not smaller than the aperture of the first fuel injection hole 111. This arrangement ensures that the heat shield 21 does not affect the normal injection of the first fuel.

[0043] Optionally, the injection portion 11 is provided with a plurality of first fuel injection holes 111, and the heat insulation cover 21 is provided with a plurality of first connecting holes 211. The plurality of first fuel injection holes 111 are connected to the plurality of first connecting holes 211 in a one-to-one correspondence. Such an arrangement ensures that the first fuel can be evenly injected into the combustion chamber 5 through the plurality of first fuel injection holes 111 and the corresponding first connecting holes 211, thereby ensuring that the first fuel is fully burned.

[0044] Optionally, the injection portion 11 is further provided with a second fuel injection hole 112, which is used to inject a second fuel into the combustion chamber 5. The heat shield 21 is further provided with a second connecting hole 212, one end of which is connected to the second fuel injection hole 112, and the other end of which is used to communicate with the combustion chamber 5. During fuel injection, the second fuel can be injected into the combustion chamber 5 through the second fuel injection hole 112 on the injection portion 11 and the second connecting hole 212 on the heat shield 21 for combustion. Under the protection of the heat shield 21, the second fuel injection hole 112 on the injection portion 11 can also be protected from high temperatures, preventing carbon deposits from forming in the second fuel injection hole 112, and ensuring normal injection of the second fuel.

[0045] In this embodiment, the nozzle 1 has injection holes for injecting two different fuels and is applied to a dual-fuel injector; in other embodiments, the nozzle 1 may be provided with only one injection hole for injecting one fuel and be applied to a single-fuel injector.

[0046] In this embodiment, the second fuel injection hole 112 is located above the first fuel injection hole 111, and accordingly, the second connecting hole 212 is located above the first connecting hole 211. The first fuel injection hole 111 is used to inject liquid fuel, such as diesel, and the second fuel injection hole 112 is used to inject gaseous fuel, such as natural gas. In addition, the second fuel is the main fuel, and the first fuel is the fuel that serves as an ignition.

[0047] Optionally, the center line of the second connecting hole 212 coincides with the center line of the second fuel injection hole 112, and the aperture of the second connecting hole 212 is not smaller than the aperture of the second fuel injection hole 112. This arrangement ensures that the heat shield 21 does not affect the normal injection of the second fuel.

[0048] Optionally, the injection portion 11 is provided with a plurality of second fuel injection holes 112, and the heat shield 21 is provided with a plurality of second connecting holes 212, and the plurality of second fuel injection holes 112 are connected to the plurality of second connecting holes 212 in a one-to-one correspondence. This arrangement ensures that the second fuel can be evenly injected into the combustion chamber 5 through the plurality of second fuel injection holes 112 and the corresponding second connecting holes 212, thereby ensuring sufficient combustion of the second fuel.

[0049] Optionally, the nozzle 1 further includes a body portion 12 for embedding in the cylinder head 3. The body portion 12 is connected to the injection portion 11 and positioned above the injection portion 11. The thermal insulator 2 further includes a thermal insulation sleeve 22 connected to the thermal shield 21 and positioned above the thermal shield 21. The thermal insulation sleeve 22 is sleeved over the body portion 12 and is embedded in the cylinder head 3. It is understood that the high temperatures generated by combustion can also cause the cylinder head 3 to reach a relatively high temperature. By sleeved over the outer periphery of the body portion 12 of the nozzle 1, the high temperature of the cylinder head 3 can be prevented from affecting the nozzle 1. The body portion 12 is provided with fuel passages for supplying fuel to the first fuel injection hole 111 and the second fuel injection hole 112, respectively.

[0050] Optionally, the heat shield 21 includes a conical first fitting surface 213, which is located between the first connecting hole 211 and the second connecting hole 212 and is in close contact with the outer surface of the injection portion 11. The close contact between the first fitting surface 213 and the injection portion 11 forms a seal, preventing the first fuel and the second fuel from mixing through the gap between the heat shield 21 and the nozzle 1. The portion of the outer surface of the injection portion 11 that seals closely with the first fitting surface 213 can be configured as a spherical surface or a conical surface.

[0051] Optionally, the thermal insulation sleeve 22 includes a conical second fitting surface 221, which is located above the second connecting hole 212 and is tightly fitted with the outer surface of the main body 12. By providing a tight fit between the second fitting surface 221 and the main body 12 to form a seal, the second fuel can be prevented from flowing out from between the thermal insulation cover 21 and the nozzle 1. Specifically, the thermal insulation sleeve 22 includes a cylindrical portion 222 and a conical portion 223 connected to the top of the cylindrical portion 222. The cylindrical portion 222 is connected to the top of the thermal insulation cover 21. The inner diameter of the conical portion 223 gradually decreases from top to bottom. The second fitting surface 221 is provided on the conical portion 223. The portion of the outer surface of the main body 12 that is tightly sealed with the second fitting surface 221 can be set as a spherical surface or a conical surface.

[0052] Please refer to Figure 2This embodiment also provides an engine, which includes the above-mentioned injector assembly, the engine also including a cylinder head 3, the nozzle 1 is provided through the cylinder head 3, and the injection portion 11 extends into the combustion chamber 5, and the heat shield 21 is located in the combustion chamber 5. Specifically, the engine also includes a cylinder block (not shown in the drawings), and a piston 4 slidably provided in the cylinder block. When the piston 4 is at the top dead center, the top surface of the piston 4 and the bottom surface of the cylinder head 3 enclose a combustion chamber 5. The piston 4 moves in the cylinder block, and the position where the top surface of the piston 4 reaches the highest point is called the top dead center. At this time, the top surface of the piston 4 is farthest from the rotation center of the crankshaft.

[0053] Optionally, the engine further includes a bushing 6, which is sleeved over the nozzle 1 and embedded in the cylinder head 3. The top end of the heat insulator 2 extends into the cylinder head 3 and is located between the bushing 6 and the nozzle 1. The bushing 6 is made of a heat-conductive metal material. Due to the heat insulation provided by the heat insulator 2, the heat generated by combustion in the combustion chamber 5 can be transferred through the bushing 6, thereby avoiding affecting the nozzle 1.

[0054] 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. A heat insulating member for covering an injection portion (11) of a nozzle (1), wherein the injection portion (11) extends into a combustion chamber (5), and the injection portion (11) is provided with a first fuel injection hole (111) for injecting a first fuel into the combustion chamber (5), and a second fuel injection hole (112) for injecting a second fuel into the combustion chamber (5), characterized in that: The heat insulation member includes a heat insulation cover (21), which is used to completely cover the outer surface of the injection part (11). The heat insulation cover (21) is provided with a first connecting hole (211) and a second connecting hole (212). One end of the first connecting hole (211) is used to communicate with the first fuel injection hole (111), and the other end of the first connecting hole (211) is used to communicate with the combustion chamber (5); one end of the second connecting hole (212) is used to communicate with the second fuel injection hole (112), and the other end of the second connecting hole (212) is used to communicate with the combustion chamber (5).

2. The thermal insulation member according to claim 1, wherein The nozzle (1) further comprises a main body (12) for being embedded in the cylinder head (3), the main body (12) being connected to the injection portion (11), and the main body (12) being located above the injection portion (11); The heat insulating member further comprises a heat insulating sleeve (22) connected to the heat insulating cover (21), the heat insulating sleeve (22) being located above the heat insulating cover (21), the heat insulating sleeve (22) being used to be sleeved on the main body (12), and the heat insulating sleeve (22) being used to be embedded in the cylinder head (3).

3. The thermal insulation member according to claim 2, characterized in that The second connecting hole (212) is located above the first connecting hole (211), and the heat insulation cover (21) includes a first conical fitting surface (213), the first fitting surface (213) is located between the first connecting hole (211) and the second connecting hole (212), and the first fitting surface (213) is used to closely fit with the outer surface of the injection portion (11).

4. The thermal insulation element according to claim 3, characterized in that The heat-insulating sleeve (22) comprises a conical second fitting surface (221), the second fitting surface (221) is located above the second communicating hole (212), and the second fitting surface (221) is used to fit tightly with the outer surface of the main body (12).

5. An ejector assembly, characterized in that: The heat insulating member comprises the heat insulating member according to any one of claims 1 to 4, the injector assembly further comprising a nozzle (1), the nozzle (1) comprising an injection portion (11) for extending into a combustion chamber (5), the injection portion (11) being provided with a first fuel injection hole (111) and a second fuel injection hole (112), the first fuel injection hole (111) being used for injecting a first fuel into the combustion chamber (5), and the second fuel injection hole (112) being used for injecting a second fuel into the combustion chamber (5); The heat insulation cover (21) completely covers the outer surface of the injection portion (11); the first communication hole (211) is connected to the first fuel injection hole (111); and the second communication hole (212) is connected to the second fuel injection hole (112).

6. The injector assembly according to claim 5, wherein: The center line of the first communicating hole (211) coincides with the center line of the first fuel injection hole (111), and the aperture of the first communicating hole (211) is not smaller than the aperture of the first fuel injection hole (111).

7. The injector assembly according to claim 5, wherein: The injection portion (11) is provided with a plurality of first fuel injection holes (111), and the heat shield (21) is provided with a plurality of first communication holes (211). The plurality of first fuel injection holes (111) are connected to the plurality of first communication holes (211) in a one-to-one correspondence.

8. The injector assembly according to claim 5, wherein: The center line of the second communicating hole (212) coincides with the center line of the second fuel injection hole (112), and the aperture of the second communicating hole (212) is not smaller than the aperture of the second fuel injection hole (112).

9. The injector assembly according to claim 5, wherein: The injection portion (11) is provided with a plurality of second fuel injection holes (112), and the heat shield (21) is provided with a plurality of second communication holes (212). The plurality of second fuel injection holes (112) are connected to the plurality of second communication holes (212) in a one-to-one correspondence.

10. An engine, characterized in that: The injector assembly comprises the injector assembly according to any one of claims 5 to 9, the engine further comprising a cylinder head (3), the nozzle (1) is provided through the cylinder head (3), the injection portion (11) extends into a combustion chamber (5) of the engine, and the heat shield (21) is located in the combustion chamber (5).

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