Engine and mechanical equipment

Abstract

The utility model relates to an engine and mechanical equipment in the technical field of engines. A fuel injector of the engine comprises a fuel injection nozzle; and the choke ring is arranged on the oil nozzle in a sleeving manner. The fuel injector can reduce heat transfer in an engine cylinder, so that the temperature of the fuel injector is reduced, carbon deposition is reduced, and the reliability of the fuel injector is improved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an engine and mechanical equipment. Background Art

[0002] A fuel injector is a device used to inject fuel in an internal combustion engine. It mixes compressed air and fuel and sprays them into the engine's combustion chamber in an appropriate manner for combustion. The working principle of a fuel injector is to use pressure or other means to atomize the fuel into tiny particles to ensure adequate mixing and improve combustion efficiency.

[0003] A diesel-gas dual-fuel engine is an engine system that can use diesel and other gaseous fuels such as natural gas at the same time. A diesel-gas dual-fuel engine usually includes two fuel supply systems: one is a traditional diesel fuel system, and the other is a gaseous fuel (such as natural gas) system. The engine can switch between diesel and gas as needed to achieve flexible fuel selection.

[0004] The fuel injector of a diesel-gas dual-fuel engine has a nested structure for the fuel injector nozzle. The nozzle has a large diameter and a large heating area in the cylinder, which will cause the nozzle temperature to be high, making it easy for carbon deposits to form on the injector (nozzle). Utility Model Content

[0005] In view of the problems existing in the background technology, the present application provides an engine and a mechanical device, the fuel injector of the engine can reduce the heat transfer in the engine cylinder, thereby reducing the temperature of the fuel injector, reducing the formation of carbon deposits, and improving the reliability of the fuel injector.

[0006] According to a first aspect of the utility model, a fuel injector is provided, comprising: a fuel injection nozzle; and an air blocking ring sleeved on the fuel injection nozzle.

[0007] In some embodiments of the present invention, the air blocking ring is transitionally matched with the fuel injection nozzle.

[0008] In some embodiments of the present invention, the air blocking ring is made of a material with a high thermal expansion coefficient.

[0009] In some embodiments of the present invention, the length of the air blocking ring is smaller than the length of the fuel injector.

[0010] In some embodiments of the present invention, the air blocking ring is cylindrical.

[0011] According to a second aspect of the utility model, an engine is provided, comprising a cylinder, a cylinder head and the above-mentioned fuel injector, wherein the fuel injector is mounted on the cylinder head, and the fuel injection nozzle faces the cylinder.

[0012] In some embodiments of the utility model, a mounting hole adapted to the fuel injector is provided on the cylinder head, the fuel injector is located at one end of the mounting hole close to the cylinder, the air block ring is assembled in the mounting hole, and the air block ring is interference fit with the mounting hole.

[0013] In some embodiments of the present invention, a limiting portion is formed in the mounting hole, and the limiting portion is in contact with an end of the air blocking ring away from the cylinder.

[0014] In some embodiments of the present invention, a gap is formed between the limiting portion and the fuel injection nozzle.

[0015] According to a third aspect of the utility model, a mechanical device is provided, comprising the above-mentioned engine.

[0016] An embodiment of the present application provides a fuel injector, which is assembled in the mounting hole of the cylinder head of the engine, and at the same time, an air block ring is assembled between the fuel injector and the wall of the mounting hole, so that the fuel injector faces the cylinder of the engine, and the air block ring and the mounting hole of the cylinder head adopt an interference fit, and the air block ring and the fuel injector adopt a transition fit. The air block ring is made of a material with a large thermal expansion coefficient. When the engine is running, the air block ring expands due to the heat, and the air block ring and the fuel injector form an interference fit. The high-temperature combustion gas generated by the combustion is blocked by the air block ring to a certain extent and is difficult to enter the gap, thereby reducing the heat transfer in the cylinder, thereby reducing the temperature of the fuel injector, reducing the formation of carbon deposits, and improving the reliability of the fuel injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0018] Figure 1 Schematic diagram of the overall structure of the fuel injector in the embodiment of the present application;

[0019] Figure 2 It is a schematic diagram of the structure of the fuel injector in the embodiment of the present application assembled on the cylinder head;

[0020] Figure 3 It is a structural schematic diagram showing the assembly of the air blocking ring, the fuel injector nozzle and the mounting hole.

[0021] The reference numerals in the accompanying drawings represent the following: 1. fuel injector; 2. air blocking ring; 3. fuel injector housing; 4. fuel injector seat; 5. cylinder head; 6. mounting hole; 7. limit part. DETAILED DESCRIPTION

[0022] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0023] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0024] In the description of the present application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0025] The present application embodiment discloses a fuel injector. Figure 1 As shown, the fuel injector comprises a fuel injection nozzle 1 and an air blocking ring 2 ; wherein the air blocking ring 2 is sleeved on the fuel injection nozzle 1 .

[0026] By using the fuel injector in the technical solution, the fuel injector is assembled on the cylinder head 5 of the engine, and the air blocking ring 2 is assembled in the gap between the fuel injector 1 and the cylinder head 5, so that the fuel injector 1 faces the cylinder of the engine. When the engine is running, the high-temperature combustion gas generated by the combustion is blocked by the air blocking ring 2 to a certain extent and is difficult to enter the gap, thereby reducing the heat transfer in the cylinder, reducing the temperature of the fuel injector 1, reducing the formation of carbon deposits, and improving the reliability of the fuel injector 1.

[0027] Specifically, the fuel injector in this embodiment further includes a fuel injector housing 3, a fuel injection valve (not shown) and a fuel injector seat 4; wherein the fuel injector housing 3 is the outer shell of the fuel injector, which is used to accommodate internal components such as the fuel injection valve and is connected to the fuel supply system; the fuel injection valve is responsible for controlling the injection amount and injection time of the fuel injection nozzle 1, and realizes the fuel injection by controlling the switch of the fuel injection valve; the fuel injector seat 4 is a component connecting the fuel injector and the cylinder head 5, and guides the sprayed fuel to the correct position to ensure effective combustion.

[0028] In some embodiments of the present invention, Figure 1As shown, the air blocking ring 2 and the fuel injection nozzle 1 are transitionally matched.

[0029] It should be noted that the transition fit is between the clearance fit and the interference fit. It should be understood that the inner diameter of the air block ring 2 is larger than the outer diameter of the fuel injector 1. When the air block ring 2 and the fuel injector 1 are coaxially arranged, there is a tiny gap between the air block ring 2 and the fuel injector 1.

[0030] Furthermore, the air blocking ring 2 is made of a material with a high thermal expansion coefficient.

[0031] Specifically, the high thermal expansion coefficient material can be a metal material, such as a nickel-based alloy, an aluminum alloy, stainless steel, and the like.

[0032] In this embodiment, after the air blocking ring 2 is assembled in the gap between the fuel injector 1 and the cylinder head 5, the air blocking ring 2 and the cylinder head 5 are directly interference fit, and the air blocking ring 2 and the fuel injector 1 are transition fit. When the engine is running, the air blocking ring 2 expands due to heat, so that the air blocking ring 2 and the fuel injector 1 change from a transition fit to an interference fit, thereby effectively preventing the high-temperature combustion gas from entering the gap. The design of the air blocking ring 2, while fully considering the assembly requirements of the air blocking ring 2, also takes into account the thermal expansion of the air blocking ring 2 in a high-temperature working environment to further block the high-temperature combustion gas. The structure is simple and the air blocking effect is good.

[0033] In some embodiments of the present invention, Figure 1 As shown, the length of the choke ring 2 is smaller than the length of the fuel injection nozzle 1 .

[0034] Furthermore, the length of the air blocking ring 2 is less than half the length of the fuel injection nozzle 1 .

[0035] Furthermore, the air blocking ring 2 is cylindrical.

[0036] In this embodiment, the fuel injector 1 is cylindrical, and the cylindrical air blocking ring 2 is coaxially sleeved on the fuel injector 1, and the air blocking ring 2 is located on the side of the fuel injector 1 away from the injector housing 3, so that the air blocking ring 2 can form a close fit with the fuel injector 1 and the cylinder head 5 within a certain length range, thereby improving the air blocking effect.

[0037] This embodiment also provides an engine, such as Figure 2 As shown, the engine comprises a cylinder (not shown), a cylinder head 5 and the above-mentioned fuel injector. The fuel injector is assembled on the cylinder head 5, and the fuel injection nozzle 1 faces the cylinder.

[0038] In some embodiments of the present invention, Figure 2 and Figure 3 As shown, a mounting hole 6 adapted to the fuel injector is opened on the cylinder head 5, the fuel injector nozzle 1 is located at one end of the mounting hole 6 close to the cylinder, and the air blocking ring 2 is assembled in the mounting hole 6, and the air blocking ring 2 and the mounting hole 6 are interference fit.

[0039] In this embodiment, the air blocking ring 2 is assembled in the mounting hole 6, the air blocking ring 2 and the wall of the mounting hole 6 are interference fit, and the air blocking ring 2 and the fuel injector 1 are transition fit. When the engine is running, the air blocking ring 2 expands due to heat, so that the air blocking ring 2 and the fuel injector 1 change from a transition fit to an interference fit, thereby achieving the purpose of preventing high-temperature combustion gas from entering the gap.

[0040] In some embodiments of the present invention, Figure 3 As shown, a limiting portion 7 is formed in the mounting hole 6, and the limiting portion 7 is in contact with the end of the air blocking ring 2 away from the cylinder.

[0041] It should be noted that the injector as a whole is assembled in the mounting hole 6 from the side of the cylinder head 5 away from the cylinder, and the air blocking ring 2 is assembled in the mounting hole 6 from the side of the cylinder head 5 close to the cylinder and abuts against the limiting portion 7, so that the limiting portion 7 forms an installation positioning for the air blocking ring 2 and plays a limiting role for the air blocking ring 2 when the engine is running.

[0042] Furthermore, a gap is formed between the limiting portion 7 and the fuel injector 1 , so that the limiting portion 7 can position the air blocking ring 2 while reducing the influence of the limiting portion 7 on the installation of the fuel injector in the installation hole 6 .

[0043] Furthermore, the limiting portion 7 may be formed as a circular ring-shaped entity protruding from the inner wall of the mounting hole 6 as a whole, or may be formed as a plurality of entities protruding from the inner wall of the mounting hole 6 and arranged at intervals.

[0044] This embodiment also proposes a mechanical device, which includes the above-mentioned engine.

[0045] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An engine, characterized in that: It comprises a cylinder, a cylinder head and a fuel injector, wherein the fuel injector is mounted on the cylinder head, and comprises a fuel injection nozzle and a choke ring sleeved on the fuel injection nozzle; the fuel injection nozzle faces the cylinder; The cylinder head is provided with a mounting hole adapted to the fuel injector, the fuel injector nozzle is located at one end of the mounting hole close to the cylinder, the air blocking ring is assembled in the mounting hole, and the air blocking ring is interference fit with the mounting hole; A limiting portion is formed in the mounting hole, and the limiting portion contacts an end of the air blocking ring away from the cylinder.

2. The engine according to claim 1, characterized in that A gap is formed between the limiting portion and the fuel injection nozzle.

3. The engine according to claim 1, characterized in that The air blocking ring is transitionally matched with the fuel injection nozzle.

4. The engine according to claim 3, characterized in that The air blocking ring is made of a material with a high thermal expansion coefficient.

5. The engine according to claim 1, 3 or 4, characterized in that: The length of the air blocking ring is smaller than the length of the fuel injection nozzle.

6. The engine according to claim 1, 3 or 4, characterized in that The air blocking ring is cylindrical.

7. A mechanical device, characterized in that: Comprising an engine as claimed in any one of claims 1 to 6.

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