Methanol engine cylinder cover capable of promoting rapid and sufficient vaporization of methanol
By introducing the intake air duct heating water jacket and double-layer water jacket structure into the cylinder head of the methanol engine, the rapid vaporization and corrosion problems of methanol fuel are solved, and the combustion efficiency and reliability of the engine are improved.
Patent Information
- Application Number
- CN202510881246.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-27
- Publication Date
- 2025-08-15
AI Technical Summary
The high latent heat of vaporization of methanol fuel makes it difficult for the engine to start cold, and the liquid methanol is highly corrosive. The prior art is difficult to quickly and fully vaporize during the injection of methanol fuel, affecting the mixing uniformity and engine reliability.
A methanol engine cylinder head is designed, which includes a cylinder head water jacket and an intake passage heating water jacket. It surrounds the intake passage through a heating water jacket, provides heat to promote rapid vaporization of methanol fuel, and optimizes the flow of coolant through a double-layer water jacket structure to improve heating efficiency.
The full vaporization of methanol fuel is achieved, the combustion efficiency is improved, the fuel consumption is reduced, and the generation of corrosive substances in liquid methanol is reduced, and the engine reliability is improved.
Smart Images
Figure HDA0005472442090000011 
Figure HDA0005472442090000012 
Figure HDA0005472442090000013
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of methanol engines, in particular to a methanol engine cylinder head that promotes rapid and full vaporization of methanol. Background Art
[0002] In recent years, methanol fuel has become the first choice to replace petroleum fuel due to its abundant coal resources and mature production technology. Methanol fuel has low cost and low pollution emissions, which are its very significant advantages as an engine fuel. However, it is also subject to the high latent heat of vaporization of methanol fuel (the latent heat of vaporization of gasoline is about 310KJ / kg, while the latent heat of vaporization of methanol fuel is about 1167KJ / kg, which is about 4 times that of gasoline), which can lead to problems such as difficulty in cold starting the engine.
[0003] As a new green fuel, methanol itself has the problems of low calorific value and high latent heat of vaporization. Its characteristics bring certain challenges to the development of methanol fuel engines, mainly how to make the methanol fuel quickly and completely vaporize when injected into the airway to promote the mixing uniformity of methanol and air and reduce the strong corrosiveness of liquid methanol.
[0004] In this application, combined with the characteristics of methanol itself, the focus is on how to provide sufficient heat to it during the methanol fuel injection process to ensure that methanol is fully converted from liquid to vapor, so as to cope with and solve the vaporization problem faced when methanol is used in internal combustion engines, and promote the industrial development of methanol internal combustion engines.
[0005] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of this application. Summary of the Invention
[0006] The (main) purpose of the present invention is to provide a methanol engine cylinder head which can achieve more complete methanol vaporization and reduce the amount of formic acid-like corrosive substances produced by liquid methanol and incomplete combustion.
[0007] To this end, the present invention proposes a methanol engine cylinder head that promotes rapid and sufficient vaporization of methanol.
[0008] Preferably, the present invention may also have the following technical features:
[0009] A methanol engine cylinder head that promotes rapid and sufficient vaporization of methanol includes a cylinder head, an intake duct and a heating water jacket. The cylinder head is provided with a cylinder head water jacket and an intake duct connected to an air inlet of an intake pipe. The cylinder head also includes an intake duct heating water jacket provided on the outside of the intake duct.
[0010] Furthermore, the cylinder head is provided with a plurality of air inlet passages, and the outer side of each air inlet passage is provided with the heating water jacket.
[0011] Furthermore, the inlet of the intake passage is located on the intake side of the cylinder head, and the heating water jacket forms an opening on the intake side of the cylinder head.
[0012] Furthermore, the shape of the opening is the same as the cross-sectional shape of the heating water jacket, and the annular opening is closed by an end face flange of the air inlet pipe.
[0013] Furthermore, the heating water jacket is an annular water jacket, which surrounds the outside of the air inlet duct and surrounds the air inlet duct on all sides.
[0014] Furthermore, the heating water jacket is a C-shaped water jacket, and the heating water jacket heats a portion of the pipe body outside the air inlet duct.
[0015] Furthermore, the cylinder head water jacket is a double-layer water jacket, including an upper water jacket and a lower water jacket, and a first water hole is provided between the upper water jacket and the lower water jacket; the heating water jacket is also a double-layer water jacket, divided into an upper water jacket and a lower water jacket, and a second water hole connecting the upper water jacket and the lower water jacket is also provided.
[0016] Furthermore, the heating water jacket takes water from the cylinder head and returns the water to the cylinder cooling water jacket or downstream of the cylinder cooling water jacket.
[0017] Furthermore, the upper water jacket is provided with the water inlet connected to the upper water jacket, and the lower water jacket is provided with the water outlet connected to the lower water jacket;
[0018] Alternatively, the water inlet is arranged in the lower water jacket and the water outlet is arranged in the upper water jacket; the water inlet is connected to the lower water jacket, and the water outlet returns water to the cylinder cooling water jacket or downstream of the cylinder cooling water jacket.
[0019] Furthermore, the heating water jacket takes water from the cylinder cooling water jacket and returns the water to the front of the thermostat.
[0020] Compared to existing technologies, the present invention offers several advantages: a heated water jacket surrounds the intake duct, raising its temperature and preheating the methanol entering it. This allows for more complete methanol vaporization, resulting in higher fuel efficiency and lower fuel consumption. It also reduces the generation of corrosive formic acid-like substances from liquid methanol and incomplete combustion, improving engine reliability. Preheating the intake duct end with the heated water jacket ensures cooling of the nose bridge area and significantly enhances its heating effectiveness by allowing the heated water jacket to be selected for water intake. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic diagram of a first embodiment of the present invention.
[0022] Figure 2yes Figure 1 Coolant flow diagram.
[0023] Figure 3 yes Figure 1 Schematic diagram of the connection between the cylinder head water jacket and the heating water jacket.
[0024] Figure 4 It is a schematic diagram of a second embodiment of the present invention.
[0025] Figure 5 yes Figure 4 Coolant flow diagram.
[0026] Figure 6 2 is a schematic diagram of a third embodiment of the present invention.
[0027] Figure 7 It is a flow-pressure diagram of the cooling system of the present invention.
[0028] Figure 8 It is a schematic diagram of the arrangement of the cylinder water jacket of the present invention, and the arrow indicates the direction of coolant flow.
[0029] Figure 9 It is a schematic diagram of the cylinder cover structure of the present invention.
[0030] Figure 10 It is a partial schematic diagram of the interior of the cylinder head of the present invention.
[0031] Description of Reference Numerals
[0032] 1. Cylinder head; 11. Passage; 12. Second water hole; 14. Intake duct; 15. Second baffle; 16. Cylinder head water jacket; 17. Water jet hole; 21. Water pump upper water jacket; 22. Cylinder cooling water jacket; 3. Intake pipe; 31. Intake pipe flange surface; 4. Heating water jacket; 41. Lower water jacket; 42. Upper water jacket; 5. Cooling chip. DETAILED DESCRIPTION
[0033] The present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be emphasized that the following description is merely illustrative and is not intended to limit the scope of the present invention and its application.
[0034] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein like reference numerals refer to like parts unless otherwise specifically specified.
[0035] like Figures 1 to 10The methanol engine cylinder head shown here promotes rapid and complete methanol vaporization. The cylinder head 1 is internally provided with a cylinder head water jacket 16, an intake duct 14 connected to the air inlet of the intake pipe 3, and an intake duct heating water jacket 4 located outside the intake duct 14. The cylinder head 1 is provided with several intake ducts 14, each of which is externally provided with a heating water jacket 4. The heating water jacket 4 heats the methanol fuel within the intake ducts 14, improving its vaporization in the intake ducts 14, promoting uniform mixing of the methanol fuel and air, and reducing corrosion of the cylinder head by liquid methanol. Specifically, the inlet of the intake duct 14 is located on the intake side of the cylinder head 1.
[0036] Combine Figures 9-10 To facilitate the processing of the heating water jacket 4, an opening is formed on the air intake side of the cylinder head. Preferably, the shape of the opening is the same as the cross-sectional shape of the heating water jacket 4. When the intake pipe 3 is installed, the end flange 31 of the intake pipe 3 is used to seal the opening to prevent the liquid in the heating water jacket 4 from leaking out of the air intake side of the cylinder head. In some embodiments, the heating water jacket 4 is a double-layer water jacket structure, wherein the upper water jacket 42 and the lower water jacket 41 are separated by a second partition 15. Preferably, the end surface of the second partition 15 is spaced from the air intake side of the cylinder head, and the space forms a channel 11 connecting the upper water jacket 42 and the lower water jacket 41.
[0037] When processing the heating water jacket 4, the heating water jacket 4 is processed from the air inlet side of the cylinder head, which is easy to process. The heating water jacket 4 can also be cast when casting the cylinder head.
[0038] In some embodiments, the heating water jacket 4 is an annular water jacket that surrounds the outside of the intake duct 14 and surrounds the intake duct 14. Furthermore, the heating water jacket 4 forms an annular opening on the intake side of the cylinder head, so that the heating water jacket 4 heats the entire intake duct 14, resulting in a wider and more uniform heating area.
[0039] Alternatively, in other structural arrangements of the heating water jacket 4, the heating water jacket 4 may be a C-shaped water jacket, that is, the heating water jacket 4 only heats a portion of the pipe body outside the intake duct 14. Correspondingly, the C-shaped heating water jacket forms a C-shaped opening on the intake side of the cylinder head.
[0040] In some other embodiments, the heating water jacket 4 can also be arranged in a relative "two" shape or an L-shaped structure. The heating water jacket 4 of each intake duct 14 in the cylinder head can have a uniform structure or different structures. For example, the heating water jacket 4 of all intake ducts 14 can be annular; or the heating water jacket 4 of some intake ducts 14 can be annular, while the heating water jackets of some intake ducts 14 can be C-shaped, etc., and other combinations of structures can be used. In other words, the heating water jacket 4 proposed by the present invention is arranged on the outside of the intake duct 14. The structure or shape of the heating water jacket 4 can be diverse, as long as it can effectively heat the intake duct and promote the vaporization of methanol fuel.
[0041] A further improvement to the above solution is to further clarify the depth of the heating water jacket 4. The depth of the heating water jacket 4 refers to the distance the intake side of the heating water jacket 4 extends into the cylinder head. Preferably, to ensure the effectiveness of the heating water jacket, its depth is greater than 40 mm, preferably 80 to 150 mm.
[0042] There are also various configurations for heating the coolant within the water jacket. The cylinder head is mounted on the cylinder block, which is internally provided with a cylinder water jacket. This includes a water pump upper jacket 21 and a cylinder cooling jacket 22. These jackets are independent of each other and not directly connected. When installing the oil cooler, the oil cooler's cooling chip 5 is embedded within the water pump upper jacket 21.
[0043] One method of heating the coolant in the heating water jacket 4 is to draw water from the cylinder head and return it to the cylinder cooling water jacket 22 or downstream of the cylinder cooling water jacket. Specifically, the heating water jacket 4 is provided with a water inlet and a water outlet. The water inlet is connected to the engine cylinder head water jacket 16, and the cylinder head water jacket 16 returns water to the cylinder cooling water jacket. Preferably, the heating water jacket 4 and the cylinder head water jacket 16 are connected via a water jet 17. The heating water jacket 4 surrounds the intake duct 14, heating the intake duct 14, significantly increasing the temperature of the intake duct, rapidly preheating the methanol fuel entering the intake duct 14, and more fully vaporizing the methanol, thereby improving fuel efficiency and reducing fuel consumption. At the same time, it reduces the amount of corrosive formic acid-like substances produced by liquid methanol and incomplete combustion, thereby improving engine reliability.
[0044] Preferably, the cylinder head water jacket 16 is a double-layer water jacket, including an upper water jacket 161 and a lower water jacket 162. A first water hole is provided between the upper water jacket 161 and the lower water jacket 162. Coolant enters from the upper water jacket 161 and passes through the first water hole into the lower water jacket 162. The upper water hole of the water pump upper water jacket 21 is connected to the water inlet of the cylinder head upper water jacket 161.
[0045] Based on the design of the above-mentioned double-layer cylinder head water jacket, in some embodiments, the water inlet of the heating water jacket 4 is connected to the upper water jacket 161, and the water outlet is connected to the lower water jacket 162 or the cylinder cooling water jacket.
[0046] In other embodiments, combined Figures 1-2 The heating water jacket 4 is also a double-layer water jacket, divided into an upper water jacket 42 and a lower water jacket 41. A second water hole 12 is provided connecting the upper water jacket 42 and the lower water jacket 41. The upper water jacket 42 is provided with a water inlet connected to the upper water jacket 161, and the lower water jacket 41 is provided with a water outlet connected to the lower water jacket 162. Specifically, coolant enters from the upper water jacket 161 and is then divided into the upper water jacket 42 of the heating water jacket 4 and the lower water jacket 162 of the cylinder head. The coolant in the upper water jacket 42 flows into the lower water jacket 41 through the second water hole 12 and then enters the lower water jacket 162.
[0047] The cooling path of the cooling system of this embodiment is:
[0048] Large cycle: water pump - oil cooler - water pump upper water jacket 21 - cylinder head upper water jacket 161 - heating water jacket 4 (heating water jacket 4 returns water to cylinder head lower water jacket 162) and cylinder head lower water jacket 162 - air compressor, supercharger and cylinder cooling water jacket 22 - thermostat - radiator - water tank;
[0049] Small cycle: water pump-water pump upper water jacket 21-cylinder head upper water jacket 161-heating water jacket (heating water jacket 4 returns water to cylinder head lower water jacket 162) and cylinder head lower water jacket 162-air compressor, supercharger and cylinder block cooling water jacket 22-thermostat-oil cooler-water tank.
[0050] Or, combined Figures 4-5 The water inlet is located in the lower water jacket 41, and the water outlet is located in the upper water jacket 42. The water inlet is connected to the lower water jacket 162, and the water outlet returns water to the cylinder cooling water jacket 22 or downstream of the cylinder cooling water jacket. In this embodiment, the lower water jacket 41 of the heating water jacket draws water from the lower water jacket 162, and the coolant returns from the upper water jacket 42 to the cylinder cooling water jacket 22 or downstream of the cylinder cooling water jacket. The lower water jacket 162 cools the high-temperature area on the top surface of the combustion chamber, and the water temperature is higher than that of the upper water jacket 161. The heating water jacket 4 draws water from the lower water jacket 162 and introduces the coolant, which has cooled the high-temperature area on the top surface of the combustion chamber, into the lower water jacket 41 of the heating water jacket, thereby improving the efficiency of heating the intake duct 14.
[0051] Combine Figure 5 Another way to heat the coolant in the heating water jacket 4 is to draw water from the cylinder cooling water jacket 22 and return the water to the front of the thermostat. Preferably, the lower water jacket 41 is provided with a water inlet to draw water from the cylinder cooling water jacket 22, and the upper water jacket 42 is provided with a water outlet to return the water to the front of the thermostat.
[0052] Those skilled in the art will recognize that numerous variations to the foregoing description are possible, and that the examples and figures are intended only to describe one or more specific implementations.
[0053] Although what is considered to be exemplary embodiments of the present invention has been described and illustrated, it will be understood by those skilled in the art that various changes and substitutions may be made thereto without departing from the spirit of the present invention. In addition, many modifications may be made to adapt a particular situation to the teachings of the present invention without departing from the central concept of the invention described herein. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but rather encompasses all embodiments and their equivalents falling within the scope of the present invention.
Claims
1. A methanol engine cylinder head that promotes rapid and sufficient vaporization of methanol, comprising a cylinder head, an intake duct, and a heating water jacket. The cylinder head is provided with a cylinder head water jacket and an intake duct connected to an air inlet of an intake pipe, and is characterized by: The cylinder head further includes an intake duct heating water jacket arranged on the outer side of the intake duct.
2. The methanol engine cylinder head for promoting rapid and sufficient vaporization of methanol according to claim 1, characterized in that: The cylinder head is provided with a plurality of air inlet passages, and the outer side of each air inlet passage is provided with the heating water jacket.
3. The methanol engine cylinder head for promoting rapid and sufficient methanol vaporization according to claim 1, characterized in that: The inlet of the intake passage is located on the intake side of the cylinder head, and the heating water jacket forms an opening on the intake side of the cylinder head.
4. The methanol engine cylinder head for promoting rapid and sufficient vaporization of methanol according to claim 3, characterized in that: The shape of the opening is the same as the cross-sectional shape of the heating water jacket, and the annular opening is closed by the end face flange of the air inlet pipe.
5. The methanol engine cylinder head for promoting rapid and sufficient vaporization of methanol according to claim 3 or 4, characterized in that: The heating water jacket is an annular water jacket, which surrounds the outside of the air inlet duct and surrounds the four sides of the air inlet duct.
6. The methanol engine cylinder head for promoting rapid and sufficient methanol vaporization according to claim 3 or 4, characterized in that: The heating water jacket is a C-shaped water jacket, and the heating water jacket heats a portion of the pipe body outside the air inlet duct.
7. The methanol engine cylinder head for promoting rapid and sufficient vaporization of methanol according to claim 1, characterized in that: The cylinder head water jacket is a double-layer water jacket, including an upper water jacket and a lower water jacket, and a first water hole is provided between the upper water jacket and the lower water jacket; the heating water jacket is also a double-layer water jacket, divided into an upper water jacket and a lower water jacket, and a second water hole is provided to connect the upper water jacket and the lower water jacket.
8. The methanol engine cylinder head for promoting rapid and sufficient vaporization of methanol according to claim 7, characterized in that: The heating water jacket takes water from the cylinder head and returns the water to the cylinder block water jacket or downstream of the cylinder block water jacket.
9. The methanol engine cylinder head for promoting rapid and sufficient methanol vaporization according to claim 8, characterized in that: The upper water jacket is provided with the water inlet to communicate with the upper water jacket, and the lower water jacket is provided with the water outlet to communicate with the lower water jacket; Alternatively, the water inlet is arranged in the lower water jacket and the water outlet is arranged in the upper water jacket; the water inlet is communicated with the lower water jacket, and the water outlet returns water to the cylinder water jacket or downstream of the cylinder water jacket.
10. The methanol engine cylinder head for promoting rapid and sufficient vaporization of methanol according to claim 7, characterized in that: The heating water jacket takes water from the cylinder water jacket and returns the water to the front of the thermostat.