Methanol engines and vehicles

Abstract

The present application provides a methanol engine and a vehicle. The methanol engine includes a cylinder head, a cylinder block and an oil-gas separator. A cylinder head oil-gas passage is formed on the cylinder head, and an upper oil-gas passage is integrally formed on the cylinder block. The upper oil-gas passage has an upper interface and a lower interface. The cylinder head oil-gas passage is connected to the upper interface, and the oil-gas separator is installed on the cylinder block and connected to the lower interface. Under low temperature conditions, the oil and gas pre-separated by the cylinder head oil-gas passage enter the upper oil-gas passage through the upper interface, and the cylinder block uses its own heat to insulate the oil and gas in the upper oil-gas passage to prevent excessive oil and gas from condensing into liquid and entering the crankcase to affect normal lubrication. In addition, the oil-gas separator is connected to the lower interface, and the water or oil condensed at and above the lower interface will not directly enter the oil-gas separator to affect the separation efficiency.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a methanol engine and a vehicle. Background Art

[0002] Traditional fuel engines generally deal with the impact of low temperature on oil and gas separation by wrapping the oil and gas separation path. Unlike traditional engines, the methanol fuel in methanol engines has a high hydrogen content, and the content of gaseous water in the combustion products of methanol engines is much higher than that of traditional fuel engines. The corresponding gaseous water content in the oil and gas separation path is also relatively high. The traditional wrapping solution in low temperature environment cannot solve the problem of gaseous water in oil and gas being affected by the cold wall effect to generate a large amount of liquid water. The large amount of liquid water generated will enter the crankcase and affect normal separation.

[0003] Therefore, it is necessary to design a methanol engine that solves the above-mentioned technical problems. Summary of the invention

[0004] The present application provides a methanol engine and a vehicle, which can reduce the generation of liquid water and improve separation efficiency.

[0005] According to the first aspect of the embodiments of the present specification, a methanol engine is provided, comprising a cylinder block and an oil-gas separator, wherein an upper oil-gas passage is integrally formed on the cylinder block, the upper oil-gas passage has an upper interface and a lower interface, and the oil-gas separator is mounted on the cylinder block and communicated with the lower interface.

[0006] Furthermore, a lower oil and gas passage is integrally formed on the cylinder body, and the lower oil and gas passage is located below the lower interface and is communicated with the upper oil and gas passage.

[0007] Furthermore, it also includes a branch pipe and two flanges, one end of the branch pipe is connected to the lower interface through one of the flanges, and the other end is connected to the oil-gas separator through another of the flanges.

[0008] Furthermore, an oil-gas separator mounting seat is also provided on the cylinder body, the oil-gas separator mounting seat is arranged below the lower interface, and the oil-gas separator is mounted on the oil-gas separator mounting seat.

[0009] Furthermore, a sand removal port is provided on the lower oil and gas passage, and the sand removal port opens toward the outside of the cylinder body; the sand removal port is located between the lower interface and the oil and gas separator mounting seat.

[0010] Furthermore, the lower oil and gas passage extends downward to the lower part of the cylinder body and a one-way valve mounting hole is formed at the bottom, and the one-way valve mounting hole is opened downward.

[0011] Furthermore, it also includes an oil return one-way valve, and the oil return one-way valve is installed in the one-way valve installation hole.

[0012] Furthermore, it also includes a cylinder head and an exhaust manifold, wherein a cylinder head oil and gas passage is formed on the cylinder head, and the cylinder head oil and gas passage is communicated with the upper interface; the exhaust manifold is connected to the cylinder head, and the exhaust manifold and the upper oil and gas passage are located on the same side.

[0013] Furthermore, the upper interface of the upper oil and gas passage is flush with the top wall of the cylinder body and opens upward.

[0014] According to a second aspect of an embodiment of this specification, a vehicle is provided, comprising the methanol engine described in the first aspect above.

[0015] The present application has the following beneficial effects: under low temperature conditions, the oil and gas pre-separated through the cylinder head oil and gas passage enter the upper oil and gas passage through the upper interface, and the cylinder body uses its own heat to keep the oil and gas in the upper oil and gas passage warm, preventing excessive oil and gas from condensing into liquid and entering the crankcase to affect normal lubrication. In addition, the oil and gas separator is connected to the lower interface, and the water or oil condensed at and above the lower interface will not directly enter the oil and gas separator to affect the separation efficiency.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the specification and, together with the description, serve to explain the principles of the specification.

[0018] Figure 1 It is a partial structural schematic diagram of the cylinder block of the present application;

[0019] Figure 2 It is another partial structural schematic diagram of the cylinder body of the present application;

[0020] Figure 3 It is a structural schematic diagram of the cylinder block and the oil-gas separator of the present application;

[0021] Figure 4 yes Figure 1 The main view of

[0022] Figure 5 yes Figure 4 Cross-sectional view at AA in the middle.

[0023] Description of reference numerals:

[0024] 10-cylinder body; 11-upper oil and gas passage; 111-upper interface; 112-lower interface; 12-lower oil and gas passage; 121-sand removal port; 122-check valve mounting hole; 13-oil and gas separator mounting seat; 14-top wall;

[0025] 20-Oil and gas separator;

[0026] 30- branch pipe;

[0027] 40-flange;

[0028] 50-Oil return check valve. DETAILED DESCRIPTION

[0029] Here, the technical solutions in the embodiments (or "implementation methods") of the present application will be described clearly and completely in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0030] If there are terms involving directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of the present application are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance.

[0031] Next, the embodiments of this specification are described in detail.

[0032] Reference Figure 1 As shown, the present application discloses a methanol engine, including a cylinder head (not shown), a cylinder block 10 and an oil-gas separator 20. When the engine is working, part of the combustible mixture and combustion products enter the cylinder block 10 through the cylinder head oil-gas passage of the cylinder head, and enter the oil-gas separator 20 through the pipeline under the suction of the oil-gas separator 20. After separation, the engine oil returns to the oil pan, and the separated gas enters the combustion chamber to participate in combustion again.

[0033] In a conventional fuel engine, one end of the pipeline is connected to the cylinder head oil and gas passage, and the other end is connected to the oil and gas separator 20, so as to guide part of the combustible mixture and combustion products entering from the cylinder head into the oil and gas separator 20 for separation. In winter or in a low temperature environment, a wrapping solution is generally used to insulate the pipeline to prevent the combustible mixture and combustion products from being cooled and producing a large amount of liquid water, but there are certain limitations.

[0034] Furthermore, if the transmission fuel engine is replaced with a methanol engine, unlike traditional fuels, methanol has a high hydrogen content, and the content of gaseous water in the combustion products of the methanol engine is much higher than that of traditional fuel engines. At this time, the limitations of using a wrapping solution to insulate the pipeline are more obvious.

[0035] Therefore, in this embodiment, an upper oil and gas passage 11 is integrated on the outer wall of the cylinder body 10 to shorten the length of the pipeline connected to the oil and gas separator 20 to reduce the formation of liquid water in part of the combustible mixture and combustion products in winter or in a low temperature environment.

[0036] Specifically, the cylinder block 10 is integrated with an upper oil-gas passage 11, which has an upper interface 111 and a lower interface 112. The cylinder head oil-gas passage is connected to the upper interface 111 to connect part of the combustible mixture and combustion products that enter from the cylinder head. The oil-gas separator 20 is installed on the cylinder block 10 and is connected to the lower interface 112 to suck part of the combustible mixture and combustion products into the oil-gas separator 20 for separation.

[0037] When the methanol engine is running, a large amount of heat is generated, causing the temperature of the cylinder block 10 to rise, which in turn affects the temperature of the upper oil and gas passage 11 integrally formed on the cylinder block 10. The upper oil and gas passage 11 uses the heat brought by the cylinder block 10 to insulate the oil and gas, preventing excessive oil and gas from condensing into liquid and entering the crankcase to affect normal lubrication.

[0038] In traditional methanol engines, the exhaust temperature at the exhaust manifold is relatively high. In order to reduce the heat damage caused by the exhaust manifold to surrounding components, there is a certain distance between the exhaust manifold and nearby pipes. This will increase the difficulty of pipe layout and affect the overall layout of the methanol engine.

[0039] In this embodiment, the methanol engine further includes an exhaust manifold (not shown in the figure), which is connected to the cylinder head, and the exhaust manifold and the upper oil and gas passage 11 are located on the same side. The upper oil and gas passage 11 is made of metal and integrally formed on the cylinder block 10 to improve its structural stability, and is arranged at the edge of the cylinder block 10 to increase the distance from the exhaust manifold and reduce the impact of heat damage.

[0040] Reference Figure 1 , Figure 4 and Figure 5As shown, the cylinder body 10 is also integrally formed with a lower oil and gas passage 12, which is located below the lower interface 112 and communicates with the upper oil and gas passage 11. In this way, the gas intake position of the oil and gas separator 20 and the lower interface 112 are located in the middle of the cylinder body 10. Water / oil will be pre-separated between the upper interface 111 and the lower interface 112 of the upper oil and gas passage 11. When water reaches the lower interface 112, it will preferentially fall into the lower oil and gas passage 12 due to gravity, and oil and gas will preferentially be sucked into the oil and gas separator 20 from the lower interface 112 due to the pressure difference. Avoid water / oil being directly sucked into the oil and gas separator 20 at the upper interface 111 to affect the separation efficiency.

[0041] In another embodiment, the lower section oil and gas passage 12 adopts a branch pipe 30. In this way, the layout of the lower section oil and gas passage 12 can be more flexible, making the overall structure of the methanol engine more compact.

[0042] The methanol engine further includes a branch pipe 30 and two flanges 40. One end of the branch pipe 30 is connected to the lower interface 112 through a flange 40, and the other end is connected to the oil-gas separator 20 through another flange 40. By integrating the upper oil-gas passage 11 close to the exhaust manifold on the cylinder block 10, the length of the branch pipe 30 is shortened and the branch pipe 30 is less affected by heat, and the design is simpler and freer. For example, the branch pipe 30 can be made of plastic.

[0043] Compared with the traditional threaded connection, the flange 40 connection can withstand higher pressure and temperature, and is suitable for high-pressure and high-temperature pipeline systems, and the flange connection can provide more stable support. In addition, due to the large amount of condensed water in the methanol engine, the lower interface 112 will become larger, and the flange 40 connection is suitable for large-diameter pipelines, while the threaded connection is usually suitable for small-diameter pipelines.

[0044] Reference Figure 1 and Figure 3 As shown, the cylinder block 10 is also provided with an oil-gas separator mounting seat 13, which is arranged below the lower interface 112, and the oil-gas separator 20 is mounted on the oil-gas separator mounting seat 13. In this way, the oil-gas separator mounting seat 13 is arranged away from the exhaust manifold, reducing the heat damage of the exhaust manifold.

[0045] The lower oil and gas passage 12 is provided with a sand removal port 121, which opens toward the outside of the cylinder body 10. The sand removal port 121 is located between the lower interface 112 and the oil and gas separator mounting seat 13. In this way, when casting the upper oil and gas passage 11 and the lower oil and gas passage 12, support can be provided to ensure that the injection fills the entire model, prevent deformation or collapse, and ensure that the internal space and structure of the upper oil and gas passage 11 and the lower oil and gas passage 12 are intact.

[0046] Reference Figure 2 and Figure 5As shown, the lower oil and gas passage 12 extends downward to the lower part of the cylinder body 10 and is formed with a check valve mounting hole 122 at the bottom, and the check valve mounting hole 122 is opened downward. The methanol engine also includes an oil return check valve 50, which is mounted in the check valve mounting hole 122. In this way, the condensed liquid generated in the upper oil and gas passage 11 and the lower oil and gas passage 12 can be unidirectionally returned to the crankcase of the methanol engine through the oil return check valve 50.

[0047] In a conventional methanol engine, the top wall of the cylinder block 10 is connected to the pipeline by means of flanges, etc., which increases the material cost. In the present application, the upper oil and gas passage 11 is integrated on the cylinder block 10. When the cylinder block 10 and the cylinder head are installed, the upper oil and gas passage 11 can be aligned and connected with the cylinder head oil and gas passage at the same time, wherein the upper interface 111 of the upper oil and gas passage 11 is flush with the top wall 14 of the cylinder block 10 and opens upward. In this way, the mounting surfaces between the cylinder block 10 and the cylinder head can be set flush, which is convenient for installation.

[0048] The present application also discloses a vehicle, including the above-mentioned methanol engine. In a low-temperature environment, oil and gas enter the upper oil and gas passage 11 integrated on the cylinder body 10 through the cylinder head oil and gas passage on the cylinder head. The cylinder body 10 keeps the oil and gas warm through its own heat to prevent excessive oil and gas from condensing into liquid (mainly cooling water) and entering the engine.

[0049] The oil and gas insulated by the cylinder body 10 enter the oil-gas separator 20 through the shorter branch pipe 30 at the lower interface 112 for separation, and the condensed liquid generated in the pipeline of the lower section of the oil-gas passage 12 flows back into the crankcase cavity through the oil return one-way valve 50 installed at the bottom.

[0050] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without causing conflicts. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection of this application.

Claims

1. A methanol engine, characterized in that: It includes a cylinder body and an oil-gas separator, wherein an upper oil-gas passage is integrally formed on the cylinder body, the upper oil-gas passage has an upper interface and a lower interface, the oil-gas separator is mounted on the cylinder body and is connected with the lower interface; a lower oil-gas passage is also integrally formed on the cylinder body, the lower oil-gas passage is located below the lower interface and is connected with the upper oil-gas passage; the lower oil-gas passage extends downward to the lower part of the cylinder body and a one-way valve mounting hole is formed at the bottom, the one-way valve mounting hole is opened downward; it also includes an oil return one-way valve, the oil return one-way valve is mounted on the one-way valve mounting hole.

2. The methanol engine according to claim 1, characterized in that: It also includes a branch pipe and two flanges, one end of the branch pipe is connected to the lower interface through one of the flanges, and the other end is connected to the oil-gas separator through another of the flanges.

3. The methanol engine according to claim 1, characterized in that: The cylinder body is also provided with an oil-gas separator mounting seat, the oil-gas separator mounting seat is arranged below the lower interface, and the oil-gas separator is mounted on the oil-gas separator mounting seat.

4. The methanol engine according to claim 3, characterized in that: The lower oil and gas passage is provided with a sand removal port, which opens toward the outside of the cylinder body; the sand removal port is located between the lower interface and the oil and gas separator mounting seat.

5. The methanol engine according to claim 1, characterized in that: It also includes a cylinder head and an exhaust manifold. The cylinder head is formed with a cylinder head oil and gas passage, and the cylinder head oil and gas passage is connected to the upper interface; the exhaust manifold is connected to the cylinder head, and the exhaust manifold and the upper oil and gas passage are located on the same side.

6. The methanol engine according to claim 1, characterized in that: The upper interface of the upper oil and gas passage is flush with the top wall of the cylinder body and opens upward.

7. A vehicle, characterized in that: A methanol engine comprising any one of claims 1-6.

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