Dimethyl ether double-nozzle engine

Abstract

The utility model relates to a dimethyl ether double-nozzle engine, and relates to the field of engines. According to the technical scheme, an air cylinder sleeve is arranged in an air cylinder, a piston is cooperatively installed in the air cylinder sleeve, an air cylinder cover is installed at the top of the air cylinder, and a closed space defined by the air cylinder sleeve, the piston and the air cylinder cover is a combustion chamber of the air cylinder; an air inlet valve used for guiding fresh air into the combustion chamber, an exhaust valve used for exhausting waste gas in the combustion chamber, a first nozzle, a second nozzle and a dimethyl ether fuel tank used for supplying dimethyl ether to the first nozzle and the second nozzle are installed on the air cylinder cover. Wherein the first nozzle and the second nozzle are connected with the ECU. Under the condition, the engine can keep the same power target as a diesel engine, and meanwhile, the heat efficiency higher than that of the diesel engine and the emission lower than that of the diesel engine are achieved; the injection amount of dimethyl ether can be adjusted in time according to load and rotating speed requirements, and stable operation and efficient and clean combustion of the engine under all working conditions are achieved.

Description

Technical Field

[0001] This utility model relates to the field of engine technology, and in particular to a dimethyl ether dual-nozzle engine. Background Technology

[0002] Dimethyl ether (DME), as a representative alternative clean fuel, has received widespread attention and in-depth research from experts and scholars in related fields. DME has a high cetane number, excellent auto-ignition properties, and its physicochemical parameters are close to those of diesel fuel, making it very suitable for compression-ignition engines and an ideal diesel alternative.

[0003] Specifically, compared to diesel, dimethyl ether (DME) as an alternative fuel offers advantages such as strong power, superior emissions, high economy, and good reliability. During combustion, it effectively reduces emissions of HC, CO, and NOx, and produces no soot, thus significantly reducing vehicle exhaust pollution. DME engines also exhibit lower noise and vibration during operation. Furthermore, DME's physical properties are similar to LPG, allowing it to quickly form a good air-fuel mixture, shortening ignition delay and giving the engine better cold-start performance.

[0004] However, dimethyl ether has a lower calorific value of only about 66.9% of that of diesel fuel, and a liquid density of 78.5% of diesel fuel. From the perspective of calorific value conservation, to ensure stable diesel engine output power, it is necessary to increase the fuel supply per cycle. Typically, increasing the injection quantity is achieved by controlling the injection timing, pressure, and increasing the nozzle orifice and fuel line diameter to improve the injection rate. These measures are all improvements based on single direct injection engines, resulting in incomplete combustion, low combustion efficiency, and high equivalent indicated fuel consumption rate. Furthermore, existing dual direct injection systems usually contain two common rail systems (high / low pressure common rail), making the system more complex and bulky. Summary of the Invention

[0005] The purpose of this invention is to provide a dimethyl ether dual-nozzle engine to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A dimethyl ether dual-nozzle engine includes a cylinder, a cylinder liner is disposed inside the cylinder, a piston is fitted inside the cylinder liner, and a cylinder head is mounted on the top of the cylinder. The sealed space enclosed by the cylinder liner, the piston, and the cylinder head is the combustion chamber of the cylinder.

[0008] The cylinder head is equipped with an intake valve for introducing fresh air into the combustion chamber, an exhaust valve for expelling exhaust gas from the combustion chamber, a first nozzle, a second nozzle, and a dimethyl ether fuel tank for supplying dimethyl ether to the first nozzle and the second nozzle.

[0009] The first nozzle and the second nozzle are connected to the ECU.

[0010] In one possible implementation, the axis of the first nozzle coincides with the axis of the cylinder, the second nozzle is tilted and the angle between the first nozzle and the second nozzle is 20-40°, and the dimethyl ether ejected from the first nozzle and the second nozzle interferes with each other.

[0011] In one possible implementation, the dimethyl ether fuel tank delivers dimethyl ether through a dimethyl ether pipe to the first nozzle and the second nozzle via a first low-pressure dimethyl ether pump.

[0012] In one possible implementation, the dimethyl ether fuel tank delivers dimethyl ether via a first low-pressure dimethyl ether pump through a dimethyl ether pipe, and then via a second low-pressure dimethyl ether pump through a low-pressure dimethyl ether common rail pipe to the first nozzle and the second nozzle.

[0013] The second low-pressure dimethyl ether pump and the low-pressure dimethyl ether common rail are both connected to the ECU.

[0014] In one possible implementation, a dimethyl ether filter assembly is further provided between the first low-pressure dimethyl ether pump and the second low-pressure dimethyl ether pump to improve the purity of the dimethyl ether delivered to the first nozzle and the second nozzle.

[0015] In one possible implementation, the dimethyl ether filtration assembly includes a dimethyl ether coarse filter and a dimethyl ether fine filter arranged sequentially.

[0016] In one possible implementation, the low-pressure dimethyl ether common rail is supplied to the first nozzle and the second nozzle via a Y-connector.

[0017] The beneficial effects of the technical solution provided by this utility model include at least the following:

[0018] This technical solution involves installing a cylinder liner inside the cylinder, with a piston fitted inside the cylinder liner. A cylinder head is installed on top of the cylinder. The sealed space enclosed by the cylinder liner, piston, and cylinder head is the combustion chamber of the cylinder. The cylinder head is equipped with an intake valve for introducing fresh air into the combustion chamber, an exhaust valve for expelling exhaust gases from the combustion chamber, a first nozzle, a second nozzle, and a dimethyl ether fuel tank for supplying dimethyl ether to the first and second nozzles. The first and second nozzles are connected to the ECU. In this configuration, the engine can maintain the same power output as a diesel engine while achieving higher thermal efficiency and lower emissions. It can adjust the dimethyl ether injection quantity in a timely manner according to load and speed requirements, achieving stable operation and efficient clean combustion across all operating conditions. The overall structure is simple, facilitating engine weight reduction and simplification. Attached Figure Description

[0019] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0020] Figure 1 A schematic diagram of the structure of a dimethyl ether dual-nozzle engine provided in an exemplary embodiment of the present invention is shown.

[0021] In the diagram: 1. Cylinder liner; 2. Piston; 3. Dimethyl ether fuel tank; 4. First low-pressure dimethyl ether pump; 5. Dimethyl ether coarse filter; 6. Dimethyl ether fine filter; 7. Second low-pressure dimethyl ether pump; 8. Exhaust valve; 9. Cylinder head; 10. First nozzle; 11. Second nozzle; 12. Intake valve; 13. Low-pressure dimethyl ether common rail; 14. ECU; 15. Dimethyl ether pipe; 16. Dimethyl ether filter assembly; 17. Cylinder; 18. Y-connector. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings of this utility model, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This diagram illustrates the structure of a dimethyl ether dual-nozzle engine provided in an exemplary embodiment of the present invention. The dimethyl ether dual-nozzle engine includes a cylinder 17, a cylinder liner 1 disposed within the cylinder 17, a piston 2 fitted within the cylinder liner 1, and a cylinder head 9 mounted on the top of the cylinder 17. The sealed space enclosed by the cylinder liner 1, piston 2, and cylinder head 9 constitutes the combustion chamber of the cylinder 17. The cylinder head 9 is equipped with an intake valve 12 for introducing fresh air into the combustion chamber, an exhaust valve 8 for discharging exhaust gas from the combustion chamber, a first nozzle 10, a second nozzle 11, and a dimethyl ether fuel tank 3 for supplying dimethyl ether to the first nozzle 10 and the second nozzle 11. The first nozzle 10 and the second nozzle 11 are connected to an ECU 14.

[0026] In this embodiment, the cylinder liner 1, piston 2, and cylinder head 9 together form the combustion chamber, where the mixing and combustion of air and dimethyl ether take place to generate power. The intake valve 12 and exhaust valve 8 control the intake of fresh air and the exhaust of exhaust gas, respectively, to ensure the effective circulation of the combustion process. The first nozzle 10 and the second nozzle 11 are responsible for precisely injecting dimethyl ether fuel into the combustion chamber. They are connected to the ECU 14, which can achieve precise control of the injection quantity and timing, thereby optimizing combustion efficiency and performance. The dimethyl ether fuel tank 3 provides a continuous fuel supply to the nozzles.

[0027] In this embodiment, the ECU (Electronic Control Unit) refers to a control system integrated with a microprocessor. It receives and analyzes data from various engine sensors to precisely control key operations such as fuel injection and ignition in a dimethyl ether dual-nozzle engine. The ECU can dynamically adjust the fuel injection quantity and timing of the first nozzle 10 and the second nozzle 11 according to operating conditions to optimize combustion efficiency, improve performance, and reduce emissions. It is the core intelligent control device for achieving efficient and environmentally friendly engine operation.

[0028] Furthermore, the axis of the first nozzle 10 coincides with the axis of the cylinder 17, the second nozzle 11 is inclined, and the angle between the first nozzle 10 and the second nozzle 11 is 20-40°, and the dimethyl ether sprayed from the first nozzle 10 and the second nozzle 11 interferes with each other.

[0029] In the embodiments of this application, when the dimethyl ether sprayed from the first nozzle 10 and the second nozzle 11 interferes, a complex flow pattern is generated in the combustion chamber, which can further promote the full mixing of dimethyl ether and air. In addition, by precisely controlling the injection angle and timing of the two nozzles, the fuel can achieve the best dispersion state in the combustion chamber, thereby improving the overall performance and thermal efficiency of the engine, while reducing the generation of emissions.

[0030] Specifically, the dimethyl ether fuel tank 3 delivers dimethyl ether (DME) through a first low-pressure DME pump 4 via a DME pipe 15 to the first nozzle 10 and the second nozzle 11. The DME fuel tank 3, after passing through the DME pipe 15 via the first low-pressure DME pump 4, then delivers the DME through a second low-pressure DME pump 7 via a low-pressure DME common rail pipe 13 to the first nozzle 10 and the second nozzle 11. Both the second low-pressure DME pump 7 and the low-pressure DME common rail pipe 13 are connected to the ECU 14. The low-pressure DME common rail pipe 13 supplies DME to the first nozzle 10 and the second nozzle 11 via a Y-connector pipe 18.

[0031] In this embodiment, dimethyl ether is first drawn from the dimethyl ether fuel tank 3 by the first low-pressure dimethyl ether pump 4, transmitted through the dimethyl ether pipe 15, and then further pressurized by the second low-pressure dimethyl ether pump 7. Pressure equalization and stabilization are achieved through the low-pressure dimethyl ether common rail pipe 13. During this process, both the second low-pressure dimethyl ether pump 7 and the low-pressure dimethyl ether common rail pipe 13 are connected to the electronic control unit (ECU 14), enabling the ECU to monitor and adjust the fuel pressure and flow rate in real time, ensuring the accuracy and consistency of each injection. The low-pressure dimethyl ether common rail pipe 13 uses a Y-type connecting pipe 18 to evenly distribute fuel to the first nozzle 10 and the second nozzle 11, ensuring that both nozzles receive the same pressure and amount of fuel simultaneously. This design not only improves the reliability and response speed of the fuel delivery system but also effectively avoids uneven injection caused by fuel pressure fluctuations, thereby optimizing combustion efficiency and reducing the generation of harmful emissions. Furthermore, by intelligently managing the entire fuel supply process through the ECU, the fuel supply strategy can be dynamically adjusted according to the actual operating status of the engine, further improving engine performance and fuel economy.

[0032] Furthermore, a dimethyl ether filter assembly 16 is provided between the first low-pressure dimethyl ether pump 4 and the second low-pressure dimethyl ether pump 7 to improve the purity of the dimethyl ether delivered to the first nozzle 10 and the second nozzle 11. The dimethyl ether filter assembly 16 includes a dimethyl ether coarse filter 5 and a dimethyl ether fine filter 6 arranged sequentially.

[0033] In this embodiment, to ensure that the first nozzle 10 and the second nozzle 11 receive high-purity dimethyl ether fuel, thereby optimizing combustion efficiency and extending nozzle life, a dimethyl ether filter assembly 16 is specially provided between the first low-pressure dimethyl ether pump 4 and the second low-pressure dimethyl ether pump 7. This assembly includes a dimethyl ether coarse filter 5 and a dimethyl ether fine filter 6, which sequentially perform preliminary and fine filtration of the dimethyl ether from the first low-pressure dimethyl ether pump 4. The coarse filter mainly removes larger particulate impurities, while the fine filter further filters out minute contaminants, ensuring that the dimethyl ether finally delivered to the nozzles meets a high purity standard. This dual filtration mechanism not only effectively prevents nozzle clogging or wear caused by impurities but also improves the stability and efficiency during combustion, reduces unnecessary emissions, and is crucial for maintaining optimal engine performance.

[0034] Next, the working principle of a dimethyl ether dual-nozzle engine involved in the embodiments of this utility model will be explained.

[0035] First, the piston 2 in cylinder 17, together with the cylinder liner 1 and the cylinder head 9, forms a sealed combustion chamber. When the intake valve 12 opens, fresh air is introduced into the combustion chamber to prepare for fuel mixing. At the same time, dimethyl ether fuel starts from the dimethyl ether fuel tank 3, is initially pressurized by the first low-pressure dimethyl ether pump 4, and undergoes two-stage filtration through the dimethyl ether coarse filter 5 and the dimethyl ether fine filter 6 in the dimethyl ether filter assembly 16 to ensure fuel purity.

[0036] Secondly, the purified dimethyl ether is further pressurized by the second low-pressure dimethyl ether pump 7, and then enters the low-pressure dimethyl ether common rail 13, where pressure equalization is achieved to ensure a stable supply.

[0037] Next, dimethyl ether is evenly distributed to the first nozzle 10 and the second nozzle 11 through the Y-type connecting pipe 18. The two nozzles are arranged at different angles, with the first nozzle 10 coinciding with the cylinder axis and the second nozzle 11 being inclined. The included angle between the two is 20-40° to promote full mixing of the fuel.

[0038] Then, the ECU14 monitors and adjusts the fuel pressure, flow rate and injection timing in real time, and optimizes the fuel injection strategy based on the data fed back by the sensors. When the first nozzle 10 and the second nozzle 11 inject dimethyl ether into the combustion chamber, due to the different injection angles, some dimethyl ether fluid will interfere. This complex flow pattern helps dimethyl ether to mix better with air, thereby improving combustion efficiency and engine performance, while reducing emissions.

[0039] Finally, exhaust valve 8 opens, expelling the exhaust gases produced by combustion and completing a full combustion cycle. The entire process embodies the pursuit of precise control and high-efficiency operation in modern internal combustion engine technology, and also demonstrates how to use clean fuels to achieve environmental protection goals.

[0040] In summary, this technical solution involves installing a cylinder liner inside the cylinder, with a piston fitted inside the cylinder liner, and a cylinder head mounted on top of the cylinder. The sealed space enclosed by the cylinder liner, piston, and cylinder head forms the combustion chamber of the cylinder. The cylinder head is equipped with an intake valve for introducing fresh air into the combustion chamber, an exhaust valve for expelling exhaust gases from the combustion chamber, a first nozzle, a second nozzle, and a dimethyl ether fuel tank for supplying dimethyl ether to the first and second nozzles. The first and second nozzles are connected to the ECU. Under these conditions, the engine can maintain the same power output as a diesel engine while achieving higher thermal efficiency and lower emissions. It can adjust the dimethyl ether injection quantity in a timely manner according to load and speed requirements, achieving stable operation and efficient clean combustion across all operating conditions. The overall structure is simple, facilitating engine weight reduction and simplification.

[0041] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0042] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A dimethyl ether dual-nozzle engine, comprising a cylinder (17), wherein a cylinder liner (1) is disposed inside the cylinder (17), a piston (2) is fitted inside the cylinder liner (1), and a cylinder head (9) is mounted on the top of the cylinder (17), wherein the sealed space enclosed by the cylinder liner (1), the piston (2), and the cylinder head (9) is the combustion chamber of the cylinder (17), characterized in that: The cylinder head (9) is equipped with an intake valve (12) for introducing fresh air into the combustion chamber, an exhaust valve (8) for discharging exhaust gas from the combustion chamber, a first nozzle (10), a second nozzle (11), and a dimethyl ether fuel tank (3) for supplying dimethyl ether to the first nozzle (10) and the second nozzle (11). The first nozzle (10) and the second nozzle (11) are connected to the ECU (14).

2. The dimethyl ether dual-nozzle engine according to claim 1, characterized in that, The axis of the first nozzle (10) coincides with the axis of the cylinder (17), the second nozzle (11) is inclined, and the angle between the first nozzle (10) and the second nozzle (11) is 20-40°. The dimethyl ether phases ejected by the first nozzle (10) and the second nozzle (11) interfere with each other.

3. The dimethyl ether dual-nozzle engine according to claim 1, characterized in that, The dimethyl ether fuel tank (3) delivers dimethyl ether through the dimethyl ether pipe (15) to the first nozzle (10) and the second nozzle (11) via the first low-pressure dimethyl ether pump (4).

4. The dimethyl ether dual-nozzle engine according to claim 3, characterized in that, The dimethyl ether fuel tank (3) delivers dimethyl ether through the first low-pressure dimethyl ether pump (4) via the dimethyl ether pipe (15), and then through the second low-pressure dimethyl ether pump (7) via the low-pressure dimethyl ether common rail pipe (13) to the first nozzle (10) and the second nozzle (11). The second low-pressure dimethyl ether pump (7) and the low-pressure dimethyl ether common rail (13) are both connected to the ECU (14).

5. The dimethyl ether dual-nozzle engine according to claim 4, characterized in that, A dimethyl ether filter assembly (16) is also provided between the first low-pressure dimethyl ether pump (4) and the second low-pressure dimethyl ether pump (7) to improve the purity of the dimethyl ether delivered to the first nozzle (10) and the second nozzle (11).

6. The dimethyl ether dual-nozzle engine according to claim 5, characterized in that, The dimethyl ether filtration assembly (16) includes a dimethyl ether coarse filter (5) and a dimethyl ether fine filter (6) arranged in sequence.

7. The dimethyl ether dual-nozzle engine according to claim 4, characterized in that, The low-pressure dimethyl ether common rail (13) is supplied to the first nozzle (10) and the second nozzle (11) through a Y-type connecting pipe (18).

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