Dual fuel injector and engine including same

Abstract

The present invention relates to a dual fuel injector and an engine including same. The engine includes a cylinder having a combustion chamber for combusting a fuel; a piston reciprocating in the combustion chamber of the cylinder; and a dual fuel injector provided on the upper side of the cylinder and injecting a first fuel and a second fuel into the combustion chamber. The dual fuel injector includes: a first nozzle tip having a plurality of injection holes for injecting the first fuel; and a second nozzle tip having a plurality of injection holes for injecting the second fuel. The first nozzle tip includes: an injection hole facing the second nozzle tip; and an injection hole not facing the second nozzle tip. The second nozzle tip includes: an injection hole facing the first nozzle tip; and an injection hole not facing the second nozzle tip. The injection hole in the first nozzle tip facing the second nozzle tip is asymmetrically formed so that the injected first fuel does not interfere with the second nozzle tip, and the injection hole in the second nozzle tip facing the first nozzle tip is asymmetrically formed so that the injected second fuel does not interfere with the first nozzle tip.

Description

Dual fuel injector and engine including same

[0001] The present invention relates to an engine, and more particularly, to an engine including a dual fuel injector used in an engine using diesel and liquid fuel.

[0002] Typically, ships are operated using diesel or dual-fuel engines for the main engine that drives the propeller to propel the ship and for multiple power generation engines that supply power to various equipment and fixtures onboard the ship.

[0003] Here, a fuel injection valve is installed in the cylinder to inject fuel at the appropriate time.

[0004] The fuel injection valve injects fuel into the cylinder. When the pressure of the fuel delivered by the fuel injection pump reaches the injection pressure that enables fuel injection, this pressure opens the needle valve of the fuel injection valve, causing the fuel to be injected through the injection hole.

[0005] Dual-fuel or dual-fuel engines have two combustion modes. For example, in diesel mode, auxiliary fuel is injected before the main fuel to improve the combustion environment in the combustion chamber, thereby improving smoke and NOx emissions and improving combustion performance.

[0006] For example, in the conventional fuel injection device illustrated in Fig. 3, an injector utilizing two needles is used to inject two types of fuel. Since two types of fuel are injected into a single injector body, interference between the sprayed fuel and each fuel nozzle tip is inevitable, which poses a problem of nozzle tip contamination and damage due to thermal load.

[0007] Embodiments of the present invention seek to provide a dual fuel injector for avoiding interference between nozzle tips when injecting two types of fuel.

[0008] According to one embodiment of the present invention, a dual fuel injector and an engine including the same comprise: a cylinder having a combustion chamber for combusting fuel; a piston reciprocating in the combustion chamber of the cylinder; and a dual fuel injector provided on an upper side of the cylinder and injecting a first fuel and a second fuel into the combustion chamber. The dual fuel injector comprises a first nozzle tip having a plurality of injection holes for injecting a first fuel; and a second nozzle tip having a plurality of injection holes for injecting a second fuel, wherein the first nozzle tip comprises an injection hole facing the second nozzle tip; and an injection hole not facing the second nozzle tip, wherein the second nozzle tip comprises an injection hole facing the first nozzle tip; And it includes an injection hole that does not face the first nozzle tip, and the injection hole of the first nozzle tip that faces the second nozzle tip is formed asymmetrically so that the injected first fuel does not interfere with the second nozzle tip, and the injection hole of the second nozzle tip that faces the first nozzle tip is formed asymmetrically so that the injected second fuel does not interfere with the first nozzle tip.

[0009] According to an embodiment, the injection hole of the first nozzle tip facing the second nozzle tip is formed asymmetrically so that the injected first fuel does not interfere with the second nozzle tip, and among the plurality of injection holes of the first nozzle tip, the injection hole facing the second nozzle tip is formed so that at least one of a horizontal injection angle, a vertical injection angle, and a hole diameter is asymmetrical with respect to the injection hole not facing the second nozzle tip.

[0010] According to an embodiment, the vertical spray angle of a spray hole facing the second nozzle tip among the plurality of spray holes of the first nozzle tip is smaller than the vertical spray angle of a spray hole not facing the second nozzle tip.

[0011] According to an embodiment, the horizontal spray angle of a spray hole facing the second nozzle tip among the plurality of spray holes of the first nozzle tip is greater than the horizontal spray angle of a spray hole not facing the second nozzle tip.

[0012] According to an embodiment, the hole diameter of the injection hole facing the second nozzle tip among the plurality of injection holes of the first nozzle tip is smaller than the hole diameter of the injection hole not facing the second nozzle tip.

[0013] In an embodiment, the injection hole of the second nozzle tip facing the first nozzle tip is formed asymmetrically so that the injected second fuel does not interfere with the first nozzle tip.

[0014] According to an embodiment, among the plurality of spray holes of the second nozzle tip, the spray hole facing the first nozzle tip is formed such that at least one of the horizontal spray angle, the vertical spray angle, and the hole diameter is asymmetrical with respect to the spray hole not facing the second nozzle tip.

[0015] According to an embodiment, the vertical spray angle of the spray hole facing the first nozzle tip among the plurality of spray holes of the second nozzle tip is smaller than the vertical spray angle of the spray hole not facing the first nozzle tip.

[0016] According to an embodiment, the horizontal spray angle of the spray hole facing the first nozzle tip among the plurality of spray holes of the second nozzle tip is greater than the horizontal spray angle of the spray hole not facing the second nozzle tip.

[0017] According to an embodiment, among the plurality of injection holes of the second nozzle tip, the hole diameter of the injection hole facing the first nozzle tip is smaller than the hole diameter of the injection hole not facing the first nozzle tip.

[0018] Embodiments of the present invention can provide a dual fuel injector that can reduce the risk of nozzle tip contamination and damage due to thermal load of the dual fuel injector.

[0019] Additionally, embodiments of the present invention can provide a dual fuel injector capable of reducing deterioration of fuel efficiency and increase in smoke due to increase in unburned fuel.

[0020] The effects that can be obtained from the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention belongs from the description below.

[0021] FIG. 1 is a perspective view of a dual fuel injector according to one embodiment of the present invention.

[0022] FIG. 2 is a front view of a dual fuel injector according to one embodiment of the present invention.

[0023] Figures 3 and 4 are drawings for explaining the fuel injection form of a conventional dual fuel injector.

[0024] FIG. 5 is a drawing for explaining a fuel injection form of a dual fuel injector according to one embodiment of the present invention.

[0025] FIGS. 6 and 7 are drawings for explaining the horizontal injection angle of a dual fuel injector according to one embodiment of the present invention.

[0026] FIGS. 8 and 9 are drawings for explaining the vertical injection angle of a dual fuel injector according to one embodiment of the present invention.

[0027] FIG. 10 is a drawing for explaining the hole diameter of a dual fuel injector according to one embodiment of the present invention.

[0028] FIG. 11 is a drawing for explaining an engine including a dual fuel injector according to one embodiment of the present invention.

[0029] Below, with reference to the attached drawings, an embodiment of the present invention is described in detail so that a person having ordinary skill in the art to which the present invention pertains can easily practice it.

[0030] However, the present invention can be implemented in various different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts irrelevant to the description have been omitted, and similar parts have been designated with similar reference numerals throughout the specification.

[0031] In this specification, duplicate descriptions of identical components are omitted.

[0032] Additionally, when a component is referred to herein as being "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may be other components present in between. Conversely, when a component is referred to herein as being "directly connected" or "directly connected" to another component, it should be understood that there are no other components present in between.

[0033] Additionally, the terms used herein are only used to describe specific embodiments and are not intended to limit the present invention.

[0034] Also, in this specification, singular expressions may include plural expressions unless the context clearly indicates otherwise.

[0035] In addition, in this specification, it should be understood that terms such as “include” or “have” are intended to specify only the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, and do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0036] Also, in this specification, the term 'and / or' includes a combination of multiple listed items or any item among multiple listed items. In this specification, 'A or B' can include 'A', 'B', or 'both A and B'.

[0037] Fig. 1 is a perspective view of a dual fuel injector according to one embodiment of the present invention. Fig. 2 is a front view of a dual fuel injector according to one embodiment of the present invention.

[0038] Referring to FIGS. 1 and 2, a first nozzle tip (10) and a second nozzle tip (20) may be formed at the tip of the dual fuel injector (100) body.

[0039] The first nozzle tip (10) and the second nozzle tip (20) are separated in the direction facing each other and are axially coupled. Injection holes may be formed along the outer periphery of each of the first nozzle tip (10) and the second nozzle tip (20). At this time, a plurality of injection holes may be formed in the first nozzle tip (10). A plurality of injection holes may be formed in the second nozzle tip (20). Accordingly, diesel may be injected from the injection holes formed on the outer periphery of the first nozzle tip (10), and liquid fuel may be injected from the injection holes formed on the outer periphery of the second nozzle tip (20). The liquid fuel may include methanol, ammonia, LPG, etc.

[0040] Figures 3 and 4 are drawings for explaining the fuel injection form of a conventional dual fuel injector.

[0041] As illustrated in Fig. 3, the first fuel can be injected from the first nozzle tip (10). At this time, when a plurality of injection holes of the first nozzle tip (10) are arranged with each being spaced apart from the same distance and the horizontal injection angle of the injection holes is the same in all holes, the first fuel injected from the injection holes can interfere with the second nozzle tip (20).

[0042] As illustrated in Fig. 4, the second fuel can be injected from the second nozzle tip (20). At this time, when a plurality of second fuel injection holes of the second nozzle tip (20) are arranged at equal distances from each other and the horizontal injection angle of the injection holes is the same for all holes, the second fuel injected from the injection holes can interfere with the first nozzle tip (10).

[0043] In this way, if interference occurs in at least one of the first nozzle tip (10) and the second nozzle tip (20), durability may be affected due to contamination of the injector and damage caused by thermal load due to nozzle tip contamination. In addition, if interference occurs in at least one of the first nozzle tip (10) and the second nozzle tip (20), performance problems such as worsening fuel efficiency and increased smoke may occur due to increased unburned fuel.

[0044] FIG. 5 is a drawing for explaining a fuel injection form of a dual fuel injector according to one embodiment of the present invention.

[0045] Referring to FIG. 5, the first nozzle tip (10) includes a plurality of injection holes for injecting the first fuel, and the second nozzle tip (20) includes a plurality of injection holes for injecting the first fuel. The number of injection holes of the first nozzle tip (10) for injecting the first fuel is configured to be 10, and the number of injection holes of the second nozzle tip (20) for injecting the second fuel is configured to be 10, but is not limited thereto. The number of injection holes of each nozzle tip may be changed depending on the design, but will be described below as a nozzle tip configured to be 10 injection holes.

[0046] The plurality of injection holes of the first nozzle tip (10) may include injection holes facing the second nozzle tip (20) and injection holes not facing the second nozzle tip (20).

[0047] The first nozzle tip (10) can be formed asymmetrically with an injection hole facing the second nozzle tip (20) and an injection hole not facing the second nozzle tip (20) to avoid interference of the injected first fuel with the second nozzle tip (20).

[0048] According to an embodiment, among the plurality of spray holes of the first nozzle tip (10), the spray hole facing the second nozzle tip (20) may be formed asymmetrically with respect to at least one of the horizontal spray angle, the vertical spray angle, and the hole diameter of the spray hole not facing the first nozzle tip (10).

[0049] The plurality of injection holes of the second nozzle tip (20) may include injection holes facing the first nozzle tip (10) and injection holes not facing the first nozzle tip (10).

[0050] The second nozzle tip (20) can be formed asymmetrically with an injection hole facing the first nozzle tip (10) and an injection hole not facing the first nozzle tip (10) to avoid interference of the injected second fuel with the first nozzle tip (10).

[0051] According to an embodiment, among the plurality of spray holes of the second nozzle tip (20), the spray hole facing the first nozzle tip (10) may be formed asymmetrically with respect to at least one of the horizontal spray angle, the vertical spray angle, and the hole diameter of the spray hole not facing the second nozzle tip (20).

[0052] Through this, the first fuel injected from the first nozzle tip (10) does not interfere (500) with the second nozzle tip (20), and the second fuel injected from the second nozzle tip (20) does not interfere (500) with the second nozzle tip (10), so that each nozzle tip can be prevented from being contaminated.

[0053] FIGS. 6 and 7 are drawings for explaining the horizontal injection angle of a dual fuel injector according to one embodiment of the present invention.

[0054] Referring to FIG. 6, the horizontal spray angle (610) of the spray hole of the first nozzle tip (10) that does not face the second nozzle tip (20) and the horizontal spray angle (620) of the spray hole that faces the second nozzle tip (20) can be formed asymmetrically.

[0055] At this time, the horizontal spray angles of each of the plurality of spray holes that do not face the second nozzle tip (20) in the first nozzle tip (10) may all be the same, and the horizontal spray angles of each of the plurality of spray holes that face the second nozzle tip (20) may all be the same.

[0056] For example, the horizontal spray angle (620) of the spray hole facing the second nozzle tip (20) may be formed to be greater than the horizontal spray angle (610) of the spray hole not facing the second nozzle tip (20).

[0057] In addition, the horizontal spray angle (630) of the spray hole of the second nozzle tip (20) that does not face the first nozzle tip (10) and the horizontal spray angle (640) of the spray hole that faces the first nozzle tip (10) can be formed asymmetrically.

[0058] At this time, the horizontal spray angles of each of the plurality of spray holes that do not face the first nozzle tip (10) in the second nozzle tip (20) may all be the same, and the horizontal spray angles of each of the plurality of spray holes that face the first nozzle tip (10) may all be the same.

[0059] For example, the horizontal spray angle (640) of the spray hole facing the first nozzle tip (10) may be formed to be greater than the horizontal spray angle (630) of the spray hole not facing the first nozzle tip (10).

[0060] Referring to Fig. 7, the horizontal spray angle (2*θH,in) according to the two spray holes facing each other of the first nozzle tip (10) and the second nozzle tip (20) can be formed asymmetrically with respect to the two spray holes facing the second nozzle tip (20) and the horizontal spray angle (2*θH,out) according to the two spray holes adjacent to each other.

[0061] FIGS. 8 and 9 are drawings for explaining the vertical injection angle of a dual fuel injector according to one embodiment of the present invention.

[0062] Referring to Fig. 8, the spray hole of the first nozzle tip (10) according to the present invention may be configured with a spray hole facing the second nozzle tip and a spray hole not facing the second nozzle tip (20). At this time, the spray hole of the second nozzle tip (20) may be configured with two spray holes facing the first nozzle tip (10) and eight spray holes not facing the second nozzle tip (20).

[0063] The spray hole of the first nozzle tip (10) may be formed asymmetrically with respect to the vertical spray angle (810) of the spray hole that does not face the second nozzle tip (20) and the vertical spray angle (820) of the spray hole that faces the second nozzle tip (20).

[0064] At this time, the vertical spray angles of each of the plurality of spray holes that do not face the second nozzle tip (20) in the first nozzle tip (10) may all be the same, and the vertical spray angles of each of the plurality of spray holes that face the second nozzle tip (20) may all be the same.

[0065] For example, the vertical spray angle (820) of the spray hole facing the second nozzle tip (20) may be formed to be smaller than the vertical spray angle (810) of the spray hole not facing the second nozzle tip (20).

[0066] In addition, the vertical spray angle (830) of the spray hole of the second nozzle tip (20) that does not face the first nozzle tip (10) and the vertical spray angle (840) of the spray hole that faces the first nozzle tip (10) can be formed asymmetrically.

[0067] At this time, the vertical spray angles of each of the plurality of spray holes that do not face the first nozzle tip (10) in the second nozzle tip (20) may all be the same, and the vertical spray angles of each of the plurality of spray holes that face the first nozzle tip (10) may all be the same.

[0068] For example, the vertical spray angle (840) of the spray hole facing the first nozzle tip (10) may be formed to be smaller than the vertical spray angle (830) of the spray hole not facing the first nozzle tip (10).

[0069] Referring to FIG. 9, the vertical spray angle (2*θV,in) according to the two spray holes facing each other of the first nozzle tip (10) and the second nozzle tip (20) can be formed asymmetrically with respect to the horizontal spray angle (2*θV,out) according to the two spray holes facing the second nozzle tip (20) and the two spray holes close to each other.

[0070] FIG. 10 is a drawing for explaining the hole diameter of a dual fuel injector according to one embodiment of the present invention.

[0071] Referring to FIG. 10, the injection hole of the first nozzle tip (10) may be formed asymmetrically with the hole diameter (1010) of the injection hole not facing the second nozzle tip (20) and the hole diameter (1020) of the injection hole facing the second nozzle tip (20).

[0072] For example, the hole diameter (1020) of the injection hole facing the second nozzle tip (20) may be formed to be smaller than the hole diameter (1010) of the injection hole not facing the second nozzle tip (20). At this time, the hole diameters of each of the plurality of injection holes not facing the second nozzle tip (20) may all be the same, and the hole diameters of each of the plurality of injection holes facing the second nozzle tip (20) may all be the same.

[0073] In addition, the injection hole of the second nozzle tip (20) may be formed asymmetrically with the hole diameter (1030) of the injection hole that does not face the first nozzle tip (10) and the hole diameter (1040) of the injection hole that faces the first nozzle tip (10).

[0074] At this time, the hole diameters of each of the plurality of injection holes that do not face the first nozzle tip (10) may all be the same, and the hole diameters of each of the plurality of injection holes that face the first nozzle tip (10) may all be the same.

[0075] For example, the hole diameter (1040) of the injection hole facing the first nozzle tip (10) may be formed to be smaller than the hole diameter (1030) of the injection hole not facing the first nozzle tip (10).

[0076] FIG. 11 is a drawing for explaining an engine including a dual fuel injector according to one embodiment of the present invention.

[0077] Referring to FIG. 11, an engine (2000) including a dual fuel injector (100) can be configured such that when air is introduced into a combustion chamber (2300) through an intake pipe (2100) and an intake valve (2200), the introduced air is compressed as a piston (2400) rises, and can be transformed into a high-temperature, high-pressure state. The piston (2400) can be connected to a crankshaft through a connecting rod (1150) having a rod shape. The piston (2400) can move upward as the crankshaft rotates.

[0078] In the engine (2000), when diesel fuel is injected into the combustion chamber through the injector (100) at a certain point, the injected fuel ignites spontaneously to create a flame, and then low / carbon-free fuel (liquid fuel, ammonia, hydrogen, etc.) can be injected into the combustion chamber through the same injector (100). At this time, the dual fuel injector (100) has two paths inside, so that two types of fuel are injected with one injector, and since the nozzle tips are positioned side by side, it is necessary to avoid interference with the nozzle tips when spraying the diesel fuel.

[0079] Thereafter, the engine (2000) can operate by combusting fuel injected from a dual fuel injector (100) and by means of a piston. Exhaust gas generated by combustion of fuel in the combustion chamber can be discharged outside the combustion chamber through an exhaust valve (2600) and an exhaust pipe (2700).

[0080] Although the present invention has been illustrated and described with respect to specific embodiments, it will be apparent to those skilled in the art that the present invention may be variously improved and modified without departing from the technical spirit of the invention as defined by the following claims.

[0081] Various embodiments for implementing the present invention have been described in detail in the previous table of contents.

[0082] The present invention is applicable to engine-related technology and thus is recognized as having industrial applicability.

Claims

1. In a dual fuel injector and an engine including the same, A cylinder having a combustion chamber for burning fuel; a piston reciprocating in the combustion chamber of the cylinder; and It comprises a dual fuel injector provided on the upper side of the cylinder and injecting first fuel and second fuel into the combustion chamber, The above dual fuel injector A first nozzle tip having a plurality of injection holes for injecting the first fuel; and A second nozzle tip having a plurality of injection holes for injecting the second fuel; Including, The above first nozzle tip A spray hole facing the second nozzle tip; and Including an injection hole that does not face the second nozzle tip, The above second nozzle tip A spray hole facing the first nozzle tip; and Including an injection hole that does not face the first nozzle tip, The injection hole of the first nozzle tip facing the second nozzle tip is formed asymmetrically so that the injected first fuel does not interfere with the second nozzle tip. The injection hole of the second nozzle tip facing the first nozzle tip is characterized in that it is formed asymmetrically so that the injected second fuel does not interfere with the first nozzle tip. Dual fuel injector and engine comprising same.

2. In paragraph 1, The injection hole facing the second nozzle tip of the first nozzle tip is formed asymmetrically so that the injected first fuel does not interfere with the second nozzle tip. It is characterized in that among the plurality of spray holes of the first nozzle tip, the spray hole facing the second nozzle tip is formed so that at least one of the horizontal spray angle, the vertical spray angle, and the hole diameter is asymmetrical with respect to the spray hole not facing the second nozzle tip. Dual fuel injector and engine comprising same.

3. In paragraph 2, The vertical spray angle of the spray hole facing the second nozzle tip among the plurality of spray holes of the first nozzle tip is smaller than the vertical spray angle of the spray hole not facing the second nozzle tip. Dual fuel injector and engine comprising same.

4. In paragraph 2, The horizontal spray angle of the spray hole facing the second nozzle tip among the plurality of spray holes of the first nozzle tip is characterized in that it is larger than the horizontal spray angle of the spray hole not facing the second nozzle tip. Dual fuel injector and engine comprising same.

5. In paragraph 2, The hole diameter of the injection hole facing the second nozzle tip among the plurality of injection holes of the first nozzle tip is smaller than the hole diameter of the injection hole not facing the second nozzle tip. Dual fuel injector and engine comprising same.

6. In paragraph 1, The injection hole of the second nozzle tip facing the first nozzle tip is formed asymmetrically so that the injected second fuel does not interfere with the first nozzle tip. It is characterized in that among the plurality of spray holes of the second nozzle tip, the spray hole facing the first nozzle tip is formed such that at least one of the horizontal spray angle, the vertical spray angle, and the hole diameter is asymmetrical with respect to the spray hole not facing the second nozzle tip. Dual fuel injector and engine comprising same.

7. In paragraph 6, The vertical spray angle of the spray hole facing the first nozzle tip among the plurality of spray holes of the second nozzle tip is smaller than the vertical spray angle of the spray hole not facing the first nozzle tip. Dual fuel injector and engine comprising same.

8. In paragraph 6, The horizontal spray angle of the spray hole facing the first nozzle tip among the plurality of spray holes of the second nozzle tip is characterized in that it is larger than the horizontal spray angle of the spray hole not facing the second nozzle tip. Dual fuel injector and engine comprising same.

9. In paragraph 6, It is characterized in that the hole diameter of the injection hole facing the first nozzle tip among the plurality of injection holes of the second nozzle tip is smaller than the hole diameter of the injection hole not facing the first nozzle tip. Dual fuel injector and engine comprising same.

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