Engine dual-fuel injection structure adopting premixing combustion chamber

Abstract

The invention relates to the field of fuel injection of dual-fuel engines, in particular to an engine dual-fuel injection structure adopting a premixing combustion chamber, which comprises a connecting seat, a first fuel injector and a second fuel injector are mounted on the connecting seat, and a spark plug is mounted on the connecting seat. And injection nozzles of the first fuel injector and the second fuel injector penetrate through the bottom surface of the connecting seat, and a fuel injection nozzle is mounted at the bottom end of the connecting seat. The advantages of low pollution, easiness in obtaining, high economical efficiency and the like of alternative fuel can be fully exerted, and emission performance, dynamic performance and economical efficiency are considered.

Description

Technical Field

[0001] The invention relates to the field of fuel injection of dual-fuel engines, and in particular to a dual-fuel injection structure of an engine using a premixed combustion chamber. Background Art

[0003] The combustion performance of most alternative fuels is not ideal, and they have disadvantages such as high ignition point, high minimum ignition energy, slow combustion speed, and low energy density. Taking ammonia fuel as an example, since ammonia has a low laminar flame speed and high ignition energy, it is often ignited with high-activity fuels, such as hydrogen with low ignition energy, high laminar combustion speed, and wide flammable limit. In view of the above problems, the present invention proposes an engine dual-fuel injection structure using a premixed combustion chamber to achieve dual-fuel injection, and uses auxiliary fuels (such as hydrogen, ethanol, gasoline, etc.) to effectively improve the combustion performance of alternative fuels, and ultimately achieve the purpose of reducing emission pollution. Summary of the invention

[0004] The purpose of the present invention is to provide an engine dual-fuel injection structure using a premixed combustion chamber to solve the above-mentioned problems. The engine dual-fuel injection structure of the premixed combustion chamber designed by the present invention can give full play to the advantages of alternative fuels such as low pollution, easy availability and high economy, while taking into account emissions, power and economy.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] An engine dual fuel injection structure using a premixed combustion chamber includes a connecting seat, on which a first fuel injector and a second fuel injector are mounted, on which a spark plug is mounted, the injection nozzles of the first fuel injector and the second fuel injector pass through the bottom surface of the connecting seat, and a burner is mounted at the bottom end of the connecting seat.

[0007] Preferably, the burner includes a cylindrical shell, which is installed on the bottom surface of the connecting seat, the bottom surface of the cylindrical shell is connected to a conical shell, the small end of the conical shell is arranged downward, the small end of the conical shell is connected to an injection column, and a plurality of injection holes are opened at the bottom end of the injection housing.

[0008] Preferably, the cone angle of the small end of the conical shell is 73.74°.

[0009] Preferably, the angle between the plurality of the combustion holes and the axis of the injection column is 67.5°, and the plurality of the combustion holes are evenly arranged at equal intervals.

[0010] Preferably, the connecting seat is provided with a first injector mounting hole, a second injector mounting hole, and a spark plug hole, the first fuel injector is mounted in the first injector mounting hole, the second fuel injector is mounted in the second injector mounting hole, and the spark plug is mounted in the spark plug hole.

[0011] Preferably, the included angle between the first fuel injector and the second fuel injector is 5 degrees, and the electrode gap of the spark plug is located in the burner nozzle.

[0012] The present invention has the following technical effects:

[0013] The use of dual injectors to achieve dual fuel injection and the introduction of a premixed combustion chamber in the structure enables precise control and premixing of the injection time of the main fuel and the auxiliary fuel, improves the mixing quality of the fuel gas, and enhances the ignition effect. At the same time, the enhancement of the gas vortex in the combustion chamber makes the combustion more complete, thereby improving the combustion performance of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] The use of dual injectors to achieve dual fuel injection and the introduction of a premixed combustion chamber in the structure enables precise control and premixing of the injection time of the main fuel and the auxiliary fuel, improves the mixing quality of the fuel gas, and enhances the ignition effect. At the same time, the enhancement of the gas vortex in the combustion chamber makes the combustion more complete, thereby improving the combustion performance of the engine.

[0016] Figure 1 Schematic diagram of the structure of the present invention

[0017] Figure 2 It is a schematic diagram of the top view of the structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the main structure of the present invention;

[0019] Figure 4 It is a left-side structural schematic diagram of the present invention;

[0020] Figure 5 It is a schematic diagram of the cross-sectional structure of the present invention;

[0021] Figure 6 It is a schematic diagram of the top view of the connecting seat of the present invention;

[0022] Figure 7 This is a schematic diagram of the main structure of the connecting seat of the present invention;

[0023] Figure 8 It is a left-side structural schematic diagram of the connecting seat of the present invention;

[0024] Fig. 9 The cross-sectional structure diagram of the connection seat and the burner nozzle of the present invention is shown in FIG.

[0025] Among them, 1, the first fuel injector; 2, the second fuel injector; 21, the injection nozzle; 3, the spark plug; 31, the electrode gap; 4, the connecting seat; 41, the first injector mounting hole; 42, the second injector mounting hole; 43, the spark plug hole; 5, the burner nozzle; 51, the burner hole. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Reference Figures 1 to 9 As shown, an engine dual fuel injection structure using a premixed combustion chamber includes a connecting seat 4, on which a first fuel injector 1 and a second fuel injector 2 are installed, a spark plug 3 is installed on the connecting seat 4, and the injection nozzles 21 of the first fuel injector 1 and the second fuel injector 2 pass through the bottom surface of the connecting seat 4, and a burner 5 is installed at the bottom end of the connecting seat 4.

[0029] A further optimized solution is that the burner 5 includes a cylindrical shell, which is installed on the bottom surface of the connecting seat 4. The bottom surface of the cylindrical shell is connected to a conical shell. The small end of the conical shell is set downward, and the small end of the conical shell is connected to an injection column. A plurality of injection holes 51 are opened at the bottom of the injection housing.

[0030] According to the further optimization scheme, the cone angle of the small end of the conical shell is 73.74°.

[0031] According to a further optimized solution, the angle between the plurality of combustion holes 51 and the axis of the injection column is 67.5°, and the plurality of combustion holes 51 are evenly arranged at equal intervals.

[0032] According to a further optimization scheme, a first injector mounting hole 41, a second injector mounting hole 42, and a spark plug hole 43 are provided on the connecting seat 4; the first fuel injector 1 is installed in the first injector mounting hole 41, the second fuel injector 2 is installed in the second injector mounting hole 42, and the spark plug 3 is installed in the spark plug hole 43.

[0033] According to a further optimized solution, the included angle between the first fuel injector 1 and the second fuel injector 2 is 5 degrees, and the electrode gap 31 of the spark plug 3 is located in the burner nozzle 5 .

[0034] The first fuel injector 1, the second fuel injector 2 and the spark plug are installed in the slot of the connecting piece in a triangular symmetric manner, and closely cooperate with the conical burner nozzle to form a premixed combustion chamber. During the operation of the engine, as the engine piston moves to the top dead center, the first fuel injector 1 and the second fuel injector 2 realize fuel injection in turn, forming a rich mixed gas in the premixed combustion chamber. In this process, the mutual interference between the two fuel injections and the gas vortex in the compression process will intensify the gas mixing in the premixed combustion chamber.

[0035] The first fuel injector 1 and the second fuel injector 2 are both electromagnetically controlled, which can achieve precise control of the fuel injection timing.

[0036] The ignition process of the combustible mixture in the burner 5 is realized by the spark plug. The high-temperature and high-pressure mixture of the initial combustion enters the engine cylinder through the six burner holes to mix with the mainstream gas and further burn. In this process, combined with the structural characteristics and working process of the low-speed engine, the rich mixture in the burner 5 is sprayed into the cylinder under the action of the pre-combustion expansion and expansion stroke gas vortex. Due to the turbulent characteristics of the injection, the ignition cores generated contain different lengths and speed scales, ensuring the ignition of the unburned mixture in the main combustion chamber of the engine. It ensures the full combustion of the combustible gas, and limits most of the unburned gas in the premixed combustion chamber, so that it can be used in the next cycle, reducing the emission pollution of the unburned gas.

[0037] like Figure 5 As shown, the burner has a 20mm throat structure, which guides the high-intensity disordered turbulence in the burner 5, reduces its turbulence level, and evenly sprays the high-pressure pre-combustion gas into the main combustion chamber through the symmetrically distributed combustion holes 51 at the end, thereby achieving full combustion of the combustible mixture.

[0038] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An engine dual fuel injection structure using a premixed combustion chamber, characterized in that: The invention comprises a connecting seat (4), a first fuel injector (1) and a second fuel injector (2) are mounted on the connecting seat (4), a spark plug (3) is mounted on the connecting seat (4), injection nozzles (21) of the first fuel injector (1) and the second fuel injector (2) pass through the bottom surface of the connecting seat (4), and a burner nozzle (5) is mounted at the bottom end of the connecting seat (4).

2. The dual fuel injection structure of an engine using a premixed combustion chamber according to claim 1, characterized in that: The burner (5) comprises a cylindrical shell, which is mounted on the bottom surface of the connecting seat (4). The bottom surface of the cylindrical shell is connected to a conical shell, the small end of the conical shell is arranged downward, the small end of the conical shell is connected to a spray column, and a plurality of spray holes (51) are opened at the bottom end of the spray house.

3. The dual fuel injection structure of an engine using a premixed combustion chamber according to claim 1, characterized in that: The cone angle of the small end of the conical shell is 73.74°.

4. The dual fuel injection structure of an engine using a premixed combustion chamber according to claim 2, characterized in that: The included angle between the plurality of the combustion holes (51) and the axis of the injection column is 67.5°, and the plurality of the combustion holes (51) are evenly arranged at equal intervals.

5. The dual fuel injection structure of an engine using a premixed combustion chamber according to claim 1, characterized in that: The connecting seat (4) is provided with a first injector mounting hole (41), a second injector mounting hole (42), and a spark plug hole (43); the first fuel injector (1) is mounted in the first injector mounting hole (41), the second fuel injector (2) is mounted in the second injector mounting hole (42), and the spark plug (3) is mounted in the spark plug hole (43).

6. The dual fuel injection structure of an engine using a premixed combustion chamber according to claim 1, characterized in that: The included angle between the first fuel injector (1) and the second fuel injector (2) is 5 degrees, and the electrode gap (31) of the spark plug (3) is located in the burner nozzle (5).

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