Methanol engine air inlet system and methanol engine
By introducing an intake heater and a fuel injector into the intake system of a methanol engine, the problems of difficult starting and low efficiency of methanol engines in low-temperature environments have been solved, achieving full atomization and combustion of methanol and reducing specific methanol consumption.
Patent Information
- Application Number
- CN202520184874.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-02-06
AI Technical Summary
Methanol engines are difficult to start in low-temperature environments, and their efficiency decreases after starting. This is mainly because the low temperature of the intake air results in poor atomization of the methanol fuel injected by the fuel injector, leading to incomplete combustion and increased methanol consumption.
A methanol engine intake system was designed, including a throttle valve, an intake connector, an intake heater, and a fuel injector. The intake heater heats the intake air and injects fuel into the intake manifold to ensure that the methanol is fully atomized and burned.
Ensuring stable operation of the methanol engine in low-temperature environments reduces specific methanol consumption and improves engine starting performance and efficiency.
Smart Images
Figure CN223578097U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to engine equipment technical field, especially a kind of methanol engine air intake system and methanol engine. BACKGROUND
[0002] Methanol as a kind of alternative fuel, in the field such as automobile and ship has extensive application prospect, methanol has high octane rating characteristics, this makes it very suitable for high compression ratio spark ignition engine. To solve the problem of mixture uniformity of port injection engine, the design of intake pipe cavity needs to be optimized, and the installation of methanol injector and the number of alcohol injector are matched according to the shape of cylinder head air duct, to achieve the purpose of improving power and reducing alcohol consumption. At the same time, because methanol has low volatility and high latent heat of vaporization, when methanol engine is started below 12℃ environment, the methanol fuel sprayed by fuel nozzle has poor atomization effect, which leads to the situation that fuel vapor is difficult to ignite or combustion is not sufficient, greatly reducing the specific alcohol consumption of methanol engine.
[0003] In view of the above, it is urgent for the skilled in the art to develop a methanol engine air intake system and methanol engine. CONTENT OF THE UTILITY MODEL
[0004] The utility model aims at providing a kind of methanol engine air intake system and methanol engine, solve the technical problem that engine is difficult to start in low temperature environment due to low temperature of inhaled air, and engine efficiency is reduced after starting.
[0005] To achieve the above-mentioned purpose, the utility model provides a kind of methanol engine air intake system, comprising:
[0006] throttle valve, inhale air and control air-fuel ratio;
[0007] intake connector, connected with throttle valve, intake connector extends intake branch pipe to both sides of throttle valve, each intake branch pipe end is connected with intake heater, each intake heater is communicated with intake manifold, and each intake heater is located at both ends of intake manifold;
[0008] fuel injector, arranged on the outer wall of intake manifold, fuel injector is communicated with the inner cavity of intake manifold and sprays fuel into the cavity of intake manifold.
[0009] Preferably, the intake manifold includes common cylinder and independent cylinder, the common cylinder is communicated with the intake heater at both ends, each independent cylinder is uniformly arranged at the end of common cylinder away from intake heater, and each independent cylinder extends to one side of common cylinder, and each independent cylinder is communicated with common cylinder.
[0010] Preferably, the fuel injector comprises a fuel rail arranged on the outer wall of the intake manifold and extending in the length direction of the intake manifold, and a plurality of fuel nozzles are evenly arranged on the fuel rail and extend into the independent cylinder and spray fuel into the independent cylinder.
[0011] Preferably, the intake joint is specifically in the shape of a herringbone, and each intake branch is clamped and fixed by a fastener between the intake joint and the intake manifold.
[0012] Preferably, the fuel nozzles extend into the independent cylinder in pairs, and each pair of fuel nozzles is symmetrically arranged on the two sides of the inner wall of the independent cylinder, and the angle between the fuel nozzles and the inner wall of the independent cylinder is 130°.
[0013] Preferably, the fuel rail is specifically two, and each fuel rail extends from the two ends of the intake manifold to the side close to the throttle valve, and the directions of the fuel transported by the two fuel rails are opposite.
[0014] Preferably, four fixing holes are arranged on the side wall of each independent cylinder, and each fixing hole extends along the edge direction of the independent cylinder.
[0015] Preferably, the independent cylinder is specifically six, and one fuel rail sprays fuel into three independent cylinders.
[0016] A methanol engine comprising the above-mentioned methanol engine intake system.
[0017] With respect to the above background technology, the methanol engine intake system provided by the utility model comprises a throttle valve, the throttle valve absorbs a certain amount of air according to a control instruction and sends the air into an intake joint, the intake joint distributes the air to each cylinder, wherein the intake joint extends in the direction of the two sides of the intake joint and is provided with intake branches, the intake heater is connected to the two ends of the intake manifold, the intake branch and the intake manifold are communicated through an air inlet, a fuel injector is arranged on the outer wall of the intake manifold, and the fuel injector sprays a certain amount of methanol into the intake manifold according to a control instruction.
[0018] When the methanol engine intake system operates in a low-temperature environment, the throttle valve absorbs low-temperature air from the outside, the cold air is transported to the two sides of the intake manifold through the intake branches, the intake heater heats the cold air in the process of entering the intake manifold, and the fuel injector sprays methanol into the intake manifold, so that the air temperature in the cavity of the intake manifold is high, the gasification of methanol is accelerated, and fuel vapor with better atomization effect is formed. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are only a part of the embodiments of the present application, and not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.
[0020] Figure 1 The structure diagram of the methanol engine intake system provided by the embodiment of the present application is provided.
[0021] Figure 2 The side view of the methanol engine intake system provided by the embodiment of the present application is provided.
[0022] Figure 3 The structure diagram of the intake manifold provided by the embodiment of the present application is provided.
[0023] Figure 4 The cross-sectional view of the intake manifold provided by the embodiment of the present application is provided.
[0024] Wherein, 1-throttle valve; 2-inlet joint; 21-inlet branch pipe; 3-inlet heater; 4-inlet manifold; 41-shared cylinder; 42-independent cylinder; 5-fuel rail; 6-fuel nozzle; 7-fastener; 8-fixing hole. DETAILED DESCRIPTION
[0025] The technical solutions of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.
[0026] In order to make the technical personnel in the technical field better understand the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.
[0027] The utility model provides a kind of methanol engine air intake system, which comprises a throttle valve 1 that absorbs a certain amount of air according to control instructions. The throttle valve 1 is connected to an air inlet connector 2, which extends to both sides of the throttle valve 1 with two air inlet branch pipes 21. The air inlet branch pipes 21 are connected to both ends of an air intake manifold 4. The air absorbed by the throttle valve 1 is transported to the inside of the air intake manifold 4 through the air inlet branch pipes 21. An air inlet heater 3 is also provided between the air inlet branch pipes 21 and the air intake manifold 4. The air passes through the air inlet heater 3 during the process of entering the air intake manifold 4 from the air inlet branch pipes 21, and the air inlet heater 3 increases the temperature of the air. A fuel injector is provided on the outer wall of the air intake manifold 4, which sprays methanol into the inner cavity of the air intake manifold 4. In one embodiment of the application, the methanol engine starts in a low-temperature environment. After receiving the start information, the throttle valve 1 absorbs the low-temperature air from the outside. The throttle valve 1 inputs the low-temperature air into the two air inlet branch pipes 21 through the air inlet connector 2. The air inlet heater 3 at the port of each air inlet branch pipe 21 heats the low-temperature air, so that the air filled into the air intake manifold 4 has a high enough temperature. After the fuel injector sprays methanol into the inner cavity of the air intake manifold 4, the methanol fully atomizes by absorbing the heat of the air, which reduces the ignition temperature of the methanol engine. The methanol can be fully combusted, which reduces the specific alcohol consumption of the methanol engine. In addition, the heated air transfers heat to the side wall of the air intake manifold 4, which reduces the viscosity of the lubricating oil on the inner wall of the air intake manifold 4, ensuring that the methanol engine can run smoothly. The methanol engine air intake system of the application enables the methanol engine to run in a low-temperature environment.
[0028] Please refer to the attached drawings in the specification Figure 1 The air intake manifold 4 has a long span, and each extends an air inlet branch pipe 21 to both sides of the air inlet connector 2, which simultaneously transports air to both ends of the air intake manifold 4, ensuring that each position of the air intake manifold 4 can perform a gas exchange stroke in time. In addition, during the gas exchange stroke, the heated air needs to pass a certain distance to fill the air intake manifold 4. The side wall of the air intake manifold 4 absorbs part of the heat of the heated air. The air inlet branch pipes 21 are arranged at both ends of the air intake manifold 4 and connected to the air heating device, which reduces the heat loss during the filling process of the heated air, ensures that the heated air can fully mix with methanol, and reduces the ignition temperature of the methanol engine in a low-temperature environment.
[0029] Please refer to the attached drawings in the specification Figure 2, the intake manifold 4 includes common cylinder 41 and independent cylinder 42, the two ends of common cylinder 41 are provided with ports, each port is communicated with each intake heater 3, a plurality of independent cylinders 42 are uniformly arranged on the side of common cylinder 41 away from the intake heater 3, in addition, the independent cylinder 42 also extends to the side of the common cylinder 41, the inner cavity of each independent cylinder 42 is communicated with the inner cavity of the common cylinder 41, the air in the intake branch pipe 21 first enters the common cylinder 41, each independent cylinder 42 then inhales air from the inner cavity of the common cylinder 41, the common cylinder 41 communicated with the intake branch pipe 21 provides a stable buffer space for the methanol engine intake system, which is used to optimize the intake process of the methanol engine, that is, the flow rate and pressure of the air gradually tend to be stable after entering the common cylinder 41, reducing the pressure fluctuation caused by the intake pulse, avoiding the large difference in the amount of inhaled air due to the different pressure and flow rate of the inhaled air in each independent cylinder 42, resulting in engine operation disorder and reducing engine efficiency, the arrangement of a plurality of independent cylinders 42 effectively avoids the intake interference between different cylinders, since the intake process of the engine is intermittent, the intake process of each cylinder cannot be consistent, each independent cylinder 42 is respectively communicated with the common cylinder 41, the intake passages of each independent cylinder 42 do not interfere with each other, which can ensure that each cylinder can stably inhale a certain amount of air, thereby improving the engine intake efficiency and avoiding engine vibration.
[0030] Please continue to refer to the description attached Figure 2 The fuel injector includes a fuel rail 5 and a plurality of fuel nozzles 6, wherein the fuel rail 5 is arranged on the outer wall of the intake manifold 4 and located at the top of each independent cylinder 42, the fuel nozzles 6 are uniformly arranged on the fuel rail 5, each fuel nozzle 6 extends from the top of the independent cylinder 42 to the inner cavity of the independent cylinder 42, in an embodiment of the present application, the independent cylinder 42 is specifically six, two fuel nozzles 6 are arranged in each independent cylinder 42, the fuel nozzles 6 are symmetrically arranged on both sides of the inner wall of each independent cylinder 42, and the fuel nozzles 6 are arranged at an angle of 130° between the inner wall of the independent cylinder 42 and the top surface of the inner cavity of the independent cylinder 42, the two fuel nozzles 6 can uniformly inject methanol to each place of the independent cylinder 42, and ensure that the heated air can be fully mixed and atomized with the methanol.
[0031] Preferably, the intake joint 2 is specifically a herringbone shape, the port at the upper end is connected with the throttle valve 1, and the other end of the intake branch pipe 21 extends to two sides to form an intake branch pipe 21, the fixed plate is arranged on the edge of the port of the intake branch pipe 21, the fastener 7 is arranged on the fixed plate, the fastener 7 penetrates through the intake heater 3 and extends into the intake manifold 4, the fixed plate is clamped and fixed with the end surface of the intake manifold 4 by screwing the fastener 7, and preferably, the sealing ring can be arranged on the edge of the upper and lower end surfaces of the intake heating device to ensure good sealing between the intake branch pipe 21, the intake heater 3 and the intake manifold 4.
[0032] Since the air intake joint 2 extends with two air intake branches 21, the air inhaled by the throttle valve 1 fills the inner cavity of the air intake manifold 4 from both ends, and the fuel rail 5 is specifically two and identical, the delivery direction of each fuel rail 5 is opposite, which ensures that the fuel injection amount of the fuel rail 5 to each independent cylinder 42 is the same, and the fuel pressure can match the air intake amount at the corresponding position, that is, the methanol mixture concentration generated in each independent cylinder is similar, which ensures that the power deviation of each independent cylinder 42 is within the allowable error range.
[0033] The application also provides a methanol engine provided with the methanol engine air intake system in the above-mentioned embodiments, and four fixing holes 8 are arranged on the side wall of each independent cylinder 42, the fixing holes 8 are arranged along the edges of the independent cylinder 42, and a fixing member is arranged in each fixing hole 8 to mount the methanol engine air intake system on the methanol engine.
[0034] In an embodiment of the application, the methanol engine is in a low-temperature environment, the methanol engine receives a starting instruction, the throttle valve 1 absorbs the external air, the throttle valve 1 divides the air into two streams through the air intake branch 21 of the air intake joint 2 and delivers the air to both ends of the air intake manifold 4, and the air intake heater 3 is clamped and fixed between the air intake manifold 4 and each air intake branch 21, that is, the low-temperature air enters the air intake manifold 4 while passing through the air intake heater 3, the air intake heater 3 increases the temperature of the low-temperature air, and then the heated air enters the shared cylinder 41, the shared air is used to buffer the flow rate and air pressure of the air, each independent cylinder 42 communicating with the shared cylinder 41 absorbs the buffered air, and at the same time, the fuel rail 5 delivers a certain amount of methanol and sprays the methanol into the inner cavity of the independent cylinder 42 through the fuel nozzle 6, the heated air and the methanol are mixed, the air transfers heat to the methanol to volatilize the methanol, the methanol vapor and the air form fuel vapor with good atomization degree, and the ignition device of the methanol engine can easily ignite the fuel to complete the starting of the methanol engine in a low-temperature environment. In addition, the methanol engine air intake system improves the atomization degree of the fuel vapor, so that the methanol can be more fully combusted, and the specific alcohol consumption of the methanol engine is reduced.
[0035] In one embodiment of the present application, the methanol engine intake manifold 4 volume is specifically 19L, and the intake manifold 4 length span is large, and six independent cylinders 42 are uniformly arranged in the intake manifold 4, in order to ensure that the air volume and air temperature of each independent cylinder 42 in unit time are the same, the air inlet joint 2 extends to both sides and has air inlet branch pipes 21, the end of the air inlet branch pipe 21 is communicated with the inner cavity of the intake manifold 4, the positions where the air inlet branch pipe 21 is communicated with the intake manifold 4 respectively correspond to two independent cylinders 42, that is, two independent cylinders 42 are distributed between the two air inlet branch pipes 21, and each independent cylinder 42 is arranged on the side of the air inlet branch pipe 21 away from the air inlet joint 2, the distance from the air inlet branch pipe 21 port to each independent cylinder 42 is similar, when the throttle valve 1 inhales a certain amount of air, the air passes through the air inlet heater 3 of the air inlet branch pipe 21 port to heat the air, the distance from the air to each independent cylinder 42 is similar, the temperature of the air inhaled by each independent cylinder 42 in the intake stroke is similar, which ensures that the methanol fuel in each independent cylinder 42 can achieve good atomization effect, so that the methanol can be fully combusted, and the engine efficiency is improved.
[0036] It should be noted that in the present specification, the relational terms such as first and second are used only to differentiate one entity from another entity, and do not necessarily require or imply that there is any such actual relationship or order between these entities.
[0037] The principle and implementation mode of the present application are described by using specific examples in the present application, and the above embodiment description is only used to help understand the method and its core idea of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the principle of the present application, the present application can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the present application.
Claims
1. A methanol engine air intake system, characterized by, include: Throttle valve (1) is used to draw in air and control the air-fuel ratio; An intake connector (2) is connected to the throttle valve (1). The intake connector (2) extends into both sides of the throttle valve (1) with intake branch pipes (21). Each intake branch pipe (21) is connected to an intake heater (3) at its end. Each intake heater (3) is connected to an intake manifold (4). Each intake heater (3) is located on both sides of the intake manifold (4). A fuel injector is disposed on the outer wall of the intake manifold (4), and the fuel injector is connected to the inner cavity of the intake manifold (4) and injects fuel into the cavity of the intake manifold (4).
2. The methanol engine intake system of claim 1, wherein, The intake manifold (4) includes a common cylinder (41) and independent cylinders (42). The two ends of the common cylinder (41) are connected to the intake heater (3). Each of the independent cylinders (42) is evenly arranged at the end of the common cylinder (41) away from the intake heater (3), and each of the independent cylinders (42) extends toward the common cylinder (41). Each of the independent cylinders (42) is connected to the common cylinder (41).
3. The methanol engine air induction system of claim 2, wherein, The fuel injector includes a fuel rail (5), which is located on the outer wall of the intake manifold (4) and is parallel to the length direction of the intake manifold (4). A plurality of fuel nozzles (6) are evenly arranged on the fuel rail (5), and each fuel nozzle (6) extends into the independent cylinder (42) and injects fuel into the independent cylinder (42).
4. The methanol engine air induction system of claim 3, wherein, The intake connector (2) is specifically shaped like a herringbone. The intake heater (3) is clamped and fixed between the end of each intake branch pipe (21) away from the intake connector (2) and the intake manifold (4) by fasteners (7).
5. The methanol engine air induction system of claim 3, wherein, The fuel nozzles (6) extend into the independent cylinder (42) in pairs. Each fuel nozzle (6) is symmetrically distributed on both sides of the inner wall of the independent cylinder (42). The fuel nozzle (6) forms an angle of 130° with the inner wall of the independent cylinder (42).
6. The methanol engine air intake system of claim 5, wherein, Specifically, there are two fuel rails (5). Each fuel rail (5) extends from both ends of the intake manifold (4) toward the side closer to the throttle valve (1), and the direction of the fuel transported by each fuel rail (5) is opposite.
7. The methanol engine air intake system of claim 6, wherein, Each of the independent cylinders (42) has four fixing holes (8) on its side wall, and each fixing hole (8) extends along the edge of the independent cylinder (42).
8. The methanol engine air intake system of claim 7, wherein, Specifically, there are six independent cylinders (42), and one fuel rail (5) injects fuel into three of the independent cylinders (42).
9. A methanol engine characterized by The methanol engine intake system includes any one of claims 1-8.