Multi-point injection methanol supply integrated injection air inlet pipe

Abstract

The invention discloses a multi-point injection methanol supply integrated injection air inlet pipe, belongs to the technical field of engine air inlet pipes, and solves the problems that an existing methanol engine is difficult in pipeline layout and methanol is easy to leak. The air inlet manifold comprises an air inlet manifold body, the air inlet manifold body is connected with all cylinders of the air cylinder cover through a plurality of air inlet manifolds, a methanol supply channel is integrally arranged in the air inlet manifold body, and the methanol supply channel is integrally formed on the inner wall of the air inlet manifold body. A methanol nozzle which is obliquely arranged towards the interior of the cylinder cover is mounted on each intake manifold, and a methanol supply pipe for communicating the methanol supply channel with the methanol nozzle is arranged on the intake manifold. According to the multi-point injection methanol supply integrated injection air inlet pipe, the standard requirements of a marine methanol engine are met, methanol is effectively prevented from leaking into a cabin, the arrangement of a double-wall pipe can be greatly simplified, the space is saved, and the cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of engine intake pipes, and more particularly to an integrated injection intake pipe for supplying multi-point methanol injection. Background Art

[0002] The technical approaches for methanol supply systems in methanol engines include intake manifold premixing, manifold injection, and direct-injection micro-ignition technology. Manifold mixing is currently rarely used in large marine engines due to its large wetted walls, poor low-temperature mixing of methanol, and difficulty in achieving cylinder shutoff control. While direct-injection micro-ignition technology offers good atomization and mixing of methanol and pilot oil, high combustion efficiency, and a high replacement rate, it suffers from poor nozzle reliability, making a reliable product difficult to achieve in the short term. For marine methanol engines, manifold injection, due to its flexible control and relatively high reliability, is currently considered the preferred methanol supply solution for marine methanol engines. Therefore, designing an intake manifold with an integrated structure, rational nozzle layout, and safe and reliable methanol supply is crucial.

[0003] The methanol engine intake pipe is an important carrier for the installation and fixation of the engine air pipeline and methanol nozzle. Its design structure directly affects the reliability and safety of the methanol supply system and the uniformity of methanol atomization and mixing after injection, thus affecting the stability and reliability of the methanol engine performance. Figure 1 As shown, in a conventional multi-point injection arrangement, methanol supply and air intake are separate piping systems. The air intake is supplied by drilling directly into the corresponding intake duct a of each cylinder, with methanol nozzles 1 positioned peripherally there. Methanol supply is supplied by a methanol common rail pipe b branching to each methanol nozzle 1. Considering methanol's low-flashpoint and toxic nature, and based on ship safety considerations, the Guidelines for the Use of Methanol and Ethanol Fuels in Ships require that methanol engine supply piping utilize a double-walled structure (i.e., the inner wall of the double-walled pipe supplies methanol. If a leak occurs in the inner pipe, the outer pipe can be used to collect and ventilate the leak) to prevent leakage into the engine room.

[0004] The existing multi-point injection layout of methanol engines uses a double-walled pipe structure designed between the methanol common rail pipe and the branches of each cylinder, which is relatively complex, difficult to process, and has a high risk of leakage.

[0005] Therefore, it is urgent to design a new type of multi-point injection methanol supply integrated injection intake pipe to solve the above problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the existing technology and provide an integrated injection intake pipe for multi-point methanol injection, which meets the requirements of the marine methanol engine specifications, effectively prevents methanol from leaking into the engine room, and can greatly simplify the double-wall pipe layout, save space and reduce costs.

[0007] The technical solution of the present invention is as follows: a multi-point injection methanol supply integrated injection intake pipe, including an intake manifold, the intake manifold is connected to each cylinder of the cylinder head through multiple intake manifolds, a methanol supply channel is integrated in the intake manifold, the methanol supply channel is integrally formed on the inner wall of the intake manifold, each of the intake manifolds is installed with a methanol nozzle inclined toward the cylinder head, the intake manifold is provided with a methanol supply pipe connecting the methanol supply channel with the methanol nozzle, one end of the intake manifold is detachably connected to the rear connecting pipe of the engine intercooler, one end of the methanol supply channel is detachably connected to the methanol supply pipeline in the ship's engine room, the other ends of the intake manifold and the methanol supply channel are both closed structures, and the other end of the intake manifold is provided with a temperature and pressure measuring sensor for detecting the temperature and pressure in the methanol supply channel, and the other end of the intake manifold is detachably installed with a sensor enclosure pipe surrounding the temperature and pressure measuring sensor.

[0008] As a further improvement, the air intake manifold is a segmented structure, and two adjacent sections of the air intake manifold are connected by flanges and bolts, and a sealing ring is provided between the two flanges corresponding to the two adjacent sections of the air intake manifold.

[0009] Furthermore, a positioning boss and a positioning groove are respectively provided at both ends of the methanol supply channel corresponding to each section of the intake manifold. After the two adjacent sections of the intake manifold are docked and installed, the positioning boss corresponding to one section of the intake manifold is inserted into the positioning groove corresponding to the other section of the intake manifold, and a sealing ring is provided at the docking point between the positioning boss and the positioning groove.

[0010] Furthermore, a premixing chamber is provided in the cylinder head corresponding to each intake manifold, and the premixing chamber connects the intake manifold with the valve. The methanol nozzle is located on the intake manifold near one end of the cylinder head, and the injection direction of the methanol nozzle points to the valve stem umbrella position of the valve.

[0011] Furthermore, the premixing chamber is a cavity with one end being large and the other end being small. The large end of the premixing chamber is connected to the intake manifold, and the width of the large end of the premixing chamber is greater than the width of the intake manifold. The small end of the premixing chamber extends to the location of the valve.

[0012] Furthermore, the top surface of the premixing chamber is an upwardly concave arc structure.

[0013] Furthermore, a mounting hole is integrally formed on the intake manifold, the methanol nozzle is plugged into the mounting hole, and an inner sealing ring and an outer sealing ring are installed between the methanol nozzle and the mounting hole, an oil return hole is provided between the inner sealing ring and the outer sealing ring, and the oil return hole is connected to the methanol collection tank through a pipeline.

[0014] Furthermore, a connecting end cover for closing the other end of the intake manifold is detachably installed, the temperature and pressure measuring sensor is installed on the connecting end cover, the sensor enclosing pipe is detachably installed on the connecting end cover, and a sealing cover is detachably installed on the end of the sensor enclosing pipe away from the connecting end cover, and sealing rings are provided between the connecting end cover and the intake manifold, between the sensor enclosing pipe and the connecting end cover, and between the sealing cover and the sensor enclosing pipe.

[0015] Furthermore, the intake manifold and the intake manifold are integrally formed, and the outer wall of the intake manifold is provided with a plurality of reinforcing ribs, and the intake manifold is also provided with an explosion-proof valve connection port.

[0016] Furthermore, the methanol supply pipe is a double-walled pipe structure.

[0017] Beneficial effects

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The multi-point methanol injection integrated injection intake pipe of the present invention integrates the methanol supply channel into the inner wall of the intake manifold, which is equivalent to forming a double-wall sealed structure for the methanol pipeline, meeting the requirements of marine methanol engine specifications and effectively preventing methanol leakage into the engine room. In addition, there is no need to separately arrange the methanol supply pipeline and the intake supply pipeline, which can greatly simplify the double-wall pipe layout, save space, reduce costs, and facilitate maintenance and installation.

[0020] 2. The multi-point methanol injection integrated injection intake pipe of the present invention can arrange the optimal nozzle injection angle by integrating the mounting holes for installing the methanol nozzle on the intake manifold, reduce the methanol injection wetting wall, improve the uniformity of methanol-air mixing, and enhance the overall engine performance; moreover, the double-wall structure formed by the double sealing ring sealing between the methanol nozzle and the intake manifold meets the regulatory requirements, better solves the problem of nozzle leakage, and the methanol nozzle is relatively convenient to assemble, disassemble and maintain.

[0021] 3. The multi-point methanol injection of the present invention is supplied through an integrated injection intake pipe. A temperature and pressure measuring sensor is provided at one end of the intake manifold to measure the temperature and pressure of methanol in real time, thereby ensuring the safety of fuel use. At the same time, the temperature and pressure measuring sensor is surrounded and sealed by a sensor shielding pipe to prevent methanol from leaking from the detection channel of the temperature and pressure measuring sensor, thereby further improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural diagram of the prior art;

[0023] Figure 2 It is a structural schematic diagram of the present invention;

[0024] Figure 3 It is an enlarged schematic diagram of the cross-sectional structure of a section of the air intake manifold of the present invention;

[0025] Figure 4 Schematic diagram of the installation structure of the nozzle in the present invention;

[0026] Figure 5 for Figure 4 A schematic diagram of the structure at point A in the middle;

[0027] Figure 6 It is an enlarged schematic diagram of the cross-sectional structure of the sensor shielding pipe in the present invention.

[0028] Among them: 1-methanol nozzle, 2-intake manifold, 3-intake manifold, 4-cylinder head, 5-methanol supply channel, 6-methanol supply pipe, 7-temperature and pressure measuring sensor, 8-sensor enclosure pipe, 9-sealing ring, 10-positioning boss, 11-positioning groove, 12-premixing chamber, 13-mounting hole, 14-inner sealing ring, 15-outer sealing ring, 16-oil return hole, 17-connecting end cover, 18-sealing cover, 19-reinforcement rib, 20-explosion-proof valve connection port, a-intake duct, b-methanol common rail pipe. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0030] See Figure 2-6The present invention provides a multi-point injection methanol supply integrated injection intake pipe, including an intake manifold 2, which is connected to each cylinder of a cylinder head 4 through multiple intake manifolds 3. Specifically, the intake manifold 3 and the cylinder head 4 are connected by flanges and bolts, and a sealing ring 9 is provided between the flanges to ensure the air intake sealing. A methanol supply channel 5 is integrated in the intake manifold 2. Specifically, the methanol supply channel 5 is integrally formed on the inner wall of the intake manifold 2, which is equivalent to a double-wall structure of the methanol supply pipeline, which meets the requirements of the marine methanol engine specification. Each intake manifold 3 is equipped with a methanol supply channel 5. A methanol nozzle 1 is angled within the cylinder head 4. A methanol supply pipe 6 is installed on the intake manifold 2, connecting the methanol supply channel 5 with the methanol nozzle 1. This double-walled pipe meets the specifications for marine methanol engines. One end of the intake manifold 2 is detachably connected to the engine intercooler's rear connecting pipe. Specifically, the two are connected via a flange and bolts, with a sealing ring 9 installed between the flanges to supply air to the engine. One end of the methanol supply channel 5 is detachably connected to the methanol supply pipeline within the ship's engine room. Specifically, the two are connected via a flange and bolts, with a sealing ring 9 installed between the flanges. The other ends of the intake manifold 2 and the methanol supply channel 5 are both enclosed to prevent air leakage. A temperature and pressure sensor 7 is installed on the other end of the intake manifold 2 to detect the temperature and pressure within the methanol supply channel 5. The temperature and pressure sensor 7 is installed in a hole in the intake manifold 2, with its probe extending into the methanol supply channel 5. A sensor shielding pipe 8 is detachably mounted on the other end of the intake manifold 2, enclosing the temperature and pressure sensor 7. By arranging a temperature and pressure measuring sensor 7 at one end of the intake manifold 2 to measure the temperature and pressure of methanol in real time, the safety of fuel use is ensured; at the same time, the temperature and pressure measuring sensor 7 is surrounded and sealed by a sensor shielding pipe 8 to prevent methanol from leaking from the detection channel of the temperature and pressure measuring sensor 7, thereby further improving safety.

[0031] The multi-point injection methanol supply integrated injection intake pipe of the present invention integrates the methanol supply channel 5 into the inner wall of the intake manifold 2, which is equivalent to forming a double-wall sealed structure for the methanol pipeline, meeting the requirements of the marine methanol engine specifications, effectively preventing methanol from leaking into the engine room, and eliminating the need to separately arrange the methanol supply pipeline and the intake supply pipeline, which can greatly simplify the double-wall pipe layout, save space, reduce costs, and facilitate maintenance and installation.

[0032] Preferably, the intake manifold 2 has a segmented structure, and adjacent sections of the intake manifold 2 are connected by flanges and bolts for easy disassembly and maintenance. A sealing ring 9 is provided between the two flanges corresponding to the adjacent sections of the intake manifold 2 to ensure the sealing of the connection. The segmented structure of the intake manifold 2 is convenient for manufacturing on the one hand, and eliminates some assembly errors between the intake manifold 3 and the cylinder head 4 on the other hand, and improves the installation stability of the intake manifold 2. Furthermore, each section of the intake manifold 2 has a positioning boss 10 and a positioning groove 11 at each end of the methanol supply channel 5. After the two adjacent sections of the intake manifold 2 are docked and installed, the positioning boss 10 corresponding to one section of the intake manifold 2 is inserted into the positioning groove 11 corresponding to the other section of the intake manifold 2, and a sealing ring 9 is provided at the docking point between the positioning boss 10 and the positioning groove 11, thereby achieving rapid positioning and installation of the two sections of the intake manifold 2 and ensuring the sealing of the methanol supply channel 5.

[0033] Preferably, a premixing chamber 12 is provided in the cylinder head 4 corresponding to each intake manifold 3. The premixing chamber 12 connects the intake manifold 3 to the valve. The methanol nozzle 1 is located on the intake manifold 3 near one end of the cylinder head 4, and the injection direction of the methanol nozzle 1 is directed toward the valve stem cap portion of the valve, so that after the methanol and air are mixed, they can immediately pass through the valve and enter the combustion chamber for combustion. Furthermore, the premixing chamber 12 is a cavity with one end being large and the other end being small. The large end of the premixing chamber 12 is connected to the intake manifold 3, and the width of the large end of the premixing chamber 12 is greater than the width of the intake manifold 3. The small end of the premixing chamber 12 extends to the location of the valve, increasing the volume of the premixing chamber 12. At the same time, the air can be accelerated by passing through the narrower end of the intake manifold 3 and mixed with the methanol sprayed from the methanol nozzle 1, which can effectively improve the mixing effect. Furthermore, the top surface of the premixing chamber 12 is an upwardly concave arc structure, which further increases the volume of the premixing chamber 12 and prevents the methanol sprayed from the methanol nozzle 1 from directly contacting the inner wall of the premixing chamber 12, thereby reducing the occurrence of wet walls.

[0034] Preferably, a mounting hole 13 is integrally formed on the intake manifold 3, and the methanol nozzle 1 is inserted and installed in the mounting hole 13. An inner sealing ring 14 and an outer sealing ring 15 are installed between the methanol nozzle 1 and the mounting hole 13, forming a double-wall structure. An oil return hole 16 is provided between the inner sealing ring 14 and the outer sealing ring 15. The oil return hole 16 is connected to the methanol collection tank via a pipe. If the inner sealing ring 14 fails, the outer sealing ring 15 can still ensure a seal and allow leaked methanol to return to the methanol collection tank through the oil return hole 16 and the connecting pipe.

[0035] The multi-point injection methanol supply integrated injection intake pipe of the present invention can arrange the optimal nozzle injection angle by integrating the installation hole 13 for installing the methanol nozzle on the intake manifold 3, reduce the methanol injection wetting wall, improve the methanol-air mixing uniformity, and enhance the overall engine performance; moreover, the double-wall structure formed by the double sealing ring sealing between the methanol nozzle and the intake manifold meets the specification requirements, better solves the problem of nozzle leakage, and the methanol nozzle is relatively convenient to assemble, disassemble and maintain.

[0036] Preferably, a connecting end cap 17 is detachably mounted on the other end of the intake manifold 2 to seal it, the temperature and pressure measuring sensor 7 is mounted on the connecting end cap 17, the sensor enclosure pipe 8 is detachably mounted on the connecting end cap 17, and a sealing cover 18 is detachably mounted on the end of the sensor enclosure pipe 8 away from the connecting end cap 17. Sealing rings 9 are provided between the connecting end cap 18 and the intake manifold 2, between the sensor enclosure pipe 8 and the connecting end cap 17, and between the sealing cover 18 and the sensor enclosure pipe 8. Specifically, the connecting end cap 18 and the intake manifold 2, the sensor enclosure pipe 8 and the connecting end cap 17, and the sealing cover 18 and the sensor enclosure pipe 8 are all connected by flanges and bolts, and the sealing ring 9 is located between the two flanges to achieve detachable installation. This structure can easily disassemble the sensor shielding pipe 8 from the other end of the intake manifold 2 to maintain the temperature and pressure measuring sensor 7. At the same time, it can also maintain the inside of the intake manifold 2 and the methanol supply channel 5 without removing the connection between the intake manifold 2 and other engine components, making disassembly and maintenance more convenient.

[0037] Preferably, the intake manifold 2 and the intake manifold 3 are an integrally formed structure with better structural strength, and the outer wall of the intake manifold 2 is provided with a plurality of reinforcing ribs 19 to further improve the structural strength. An explosion-proof valve connection port 20 is also provided on the intake manifold 2 to facilitate the installation of the explosion-proof valve and further improve safety of use.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention. These modifications and improvements will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A multi-point injection methanol supply integrated injection intake pipe, comprising an intake manifold (2), wherein the intake manifold (2) is connected to each cylinder of a cylinder head (4) through a plurality of intake manifolds (3), characterized in that: A methanol supply channel (5) is integrated in the intake manifold (2), and the methanol supply channel (5) is integrally formed on the inner wall of the intake manifold (2). Each intake manifold (3) is provided with a methanol nozzle (1) inclined toward the cylinder head (4). The intake manifold (2) is provided with a methanol supply pipe (6) for connecting the methanol supply channel (5) with the methanol nozzle (1). One end of the intake manifold (2) is detachably connected to the rear connecting pipe of the engine intercooler, and one end of the methanol supply channel (5) is detachably connected to the methanol supply pipeline in the ship's engine room. The other ends of the intake manifold (2) and the methanol supply channel (5) are both closed structures, and the other end of the intake manifold (2) is provided with a temperature and pressure measuring sensor (7) for detecting the temperature and pressure in the methanol supply channel (5). The other end of the intake manifold (2) is detachably provided with a sensor enclosure pipe (8) surrounding the temperature and pressure measuring sensor (7).

2. The multi-point methanol injection integrated injection intake pipe according to claim 1, characterized in that: The air intake manifold (2) is a segmented structure, and two adjacent sections of the air intake manifold (2) are connected by flanges and bolts, and a sealing ring (9) is provided between the two flanges corresponding to the two adjacent sections of the air intake manifold (2).

3. The multi-point methanol injection integrated injection intake pipe according to claim 2, characterized in that: A positioning boss (10) and a positioning groove (11) are respectively provided at both ends of the methanol supply channel (5) corresponding to each section of the intake manifold (2). After two adjacent sections of the intake manifold (2) are butt-jointed and installed, the positioning boss (10) corresponding to one section of the intake manifold (2) is inserted into the positioning groove (11) corresponding to the other section of the intake manifold (2), and a sealing ring (9) is provided at the joint between the positioning boss (10) and the positioning groove (11).

4. The multi-point injection methanol supply integrated injection intake pipe according to claim 1, characterized in that: A premixing chamber (12) is provided in the cylinder head (4) corresponding to each intake manifold (3), and the premixing chamber (12) connects the intake manifold (3) with the valve. The methanol nozzle (1) is located on the intake manifold (3) near one end of the cylinder head (4), and the injection direction of the methanol nozzle (1) points to the valve stem umbrella position of the valve.

5. The multi-point methanol injection integrated injection intake pipe according to claim 4, characterized in that: The premixing chamber (12) is a cavity with one end being large and the other end being small. The large end of the premixing chamber (12) is connected to the intake manifold (3), and the width of the large end of the premixing chamber (12) is greater than the width of the intake manifold (3). The small end of the premixing chamber (12) extends to the location of the valve.

6. The multi-point injection methanol supply integrated injection intake pipe according to claim 4, characterized in that: The top surface of the premixing chamber (12) is an upwardly concave arc structure.

7. The multi-point methanol injection integrated injection intake pipe according to claim 1, characterized in that: The intake manifold (3) is integrally formed with a mounting hole (13), the methanol nozzle (1) is plugged and installed in the mounting hole (13), and an inner sealing ring (14) and an outer sealing ring (15) are installed between the methanol nozzle (1) and the mounting hole (13), an oil return hole (16) is provided between the inner sealing ring (14) and the outer sealing ring (15), and the oil return hole (16) is connected to the methanol collection tank through a pipeline.

8. The multi-point methanol injection integrated injection intake pipe according to claim 1, characterized in that: The other end of the intake manifold (2) is detachably mounted with a connecting end cover (17) for sealing the intake manifold, the temperature and pressure measuring sensor (7) is mounted on the connecting end cover (17), the sensor enclosing pipe (8) is detachably mounted on the connecting end cover (17), and the end of the sensor enclosing pipe (8) away from the connecting end cover (17) is detachably mounted with a sealing cover (18), and sealing rings (9) are provided between the connecting end cover (18) and the intake manifold (2), between the sensor enclosing pipe (8) and the connecting end cover (17), and between the sealing cover (18) and the sensor enclosing pipe (8).

9. The multi-point methanol injection integrated injection intake pipe according to any one of claims 1 to 8, characterized in that: The intake manifold (2) and the intake manifold (3) are integrally formed structures, and the outer wall of the intake manifold (2) is provided with a plurality of reinforcing ribs (19). The intake manifold (2) is also provided with an explosion-proof valve connection port (20).

10. The multi-point methanol injection integrated injection intake pipe according to claim 9, characterized in that: The methanol supply pipe (6) is a double-walled pipe structure.

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