Rotor engine cylinder body molded line design method and elliptical rotor engine

Abstract

The invention provides a rotor engine cylinder body molded line design method and an elliptical rotor engine, and the method comprises the steps: generating a cylinder body molded line according to a preset cylinder body molded line formula based on basic structure information and a compression ratio adjustment coefficient of the rotor engine; wherein the basic structure information comprises a generated radius, an eccentric distance and a rotation angle, and the cylinder body molded line formula is constructed based on the generated radius, the eccentric distance, the rotation angle and a compression ratio adjustment coefficient. According to the rotor engine cylinder body molded line design method and the oval rotor engine, the cylinder body with the newly-designed molded line is utilized, the size of the space between the cylinder body and the rotor is changed, a larger combustion chamber space is guaranteed, it can be guaranteed that fuel oil has a sufficient space to be mixed with air, and the combustion efficiency is improved. The compression ratio of the engine can be adjusted in a large range, and the combustion efficiency is improved.

Description

Technical Field

[0001] The present application belongs to the field of engine technology, and in particular relates to a method for designing a cylinder profile of a rotary engine and an elliptical rotary engine. Background Art

[0002] With the gradual implementation of the national low-altitude economy policy, the drone industry has taken a leading role in the low-altitude economy. Its power systems are currently mainly piston engines and batteries. However, rotary engines, with their simple structure and high power output, provide more technical options for drone power selection.

[0003] At present, since the sealing problem of the triangular rotor engine still needs to be further solved, the new elliptical rotor engine swaps the cylinder profile and rotor profile of the triangular rotor to form a new rotor engine. The sealing problem is alleviated, but its combustion chamber is fixed to the cylinder, and the compression ratio is only adjusted by the size of the cylinder combustion chamber. In order to ensure combustion, its adjustable range is small. Summary of the Invention

[0004] In view of this, the present application aims to propose a method for designing the cylinder profile of a rotary engine and an elliptical rotary engine, which utilizes a cylinder with a newly designed profile to change the size of the space between the cylinder and the rotor, thereby achieving a wide range of adjustable compression ratio of the engine and improving combustion efficiency.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] In a first aspect, the present application provides a method for designing a cylinder profile of a rotary engine, comprising:

[0007] Based on the basic structural information of the rotary engine and the compression ratio adjustment coefficient, the cylinder profile is generated according to the preset cylinder profile formula;

[0008] The basic structural information includes a creation radius, an eccentricity, and a rotation angle, and the cylinder profile formula is constructed based on the creation radius, the eccentricity, the rotation angle, and the compression ratio adjustment coefficient.

[0009] Furthermore, the cylinder profile formula includes:

[0010]

[0011] Where R represents the creation radius, e represents the eccentricity, α represents the compression ratio adjustment coefficient, and θ represents the rotation angle.

[0012] Furthermore, the adjustment range of the compression ratio adjustment coefficient is ≥0.76.

[0013] Furthermore, the generated cylinder profile is connected to the elliptical rotor profile via three cusps.

[0014] In a second aspect, based on the same inventive concept, the present application further provides an elliptical rotor engine, obtained by applying the rotor engine cylinder profile design method described in the first aspect, comprising:

[0015] A main combustion chamber formed by a cylinder body and an elliptical rotor, and a plurality of cylinder combustion chambers connected to the main combustion chamber, wherein the main combustion chamber and the cylinder combustion chambers jointly adjust the compression ratio;

[0016] The elliptical rotor is provided with an air inlet and an exhaust passage.

[0017] Furthermore, in response to the engine fuel combustion mode being a compression ignition mode, a direct injection injector is provided in the cylinder combustion chamber.

[0018] Furthermore, in response to the engine fuel combustion mode being an ignition mode, a spark plug is provided in the cylinder combustion chamber, and an intake port injector is installed on the intake port.

[0019] Furthermore, in response to the engine fuel combustion mode being a pre-combustion chamber jet ignition mode, a pre-combustion chamber assembly is provided in the cylinder combustion chamber, and an intake manifold injector is installed on the intake manifold.

[0020] Furthermore, the pre-combustion chamber assembly includes an active pre-combustion chamber assembly and a passive pre-combustion chamber assembly.

[0021] Furthermore, fuels in compression ignition mode include diesel, biodiesel, aviation kerosene, and dimethyl ether;

[0022] Fuels in ignition mode include gasoline, hydrogen, methanol, and natural gas;

[0023] Fuels used in the pre-combustion chamber jet ignition method include methanol, ammonia, and natural gas.

[0024] Compared with the prior art, the rotary engine cylinder profile design method and elliptical rotary engine described in this application have the following beneficial effects:

[0025] (1) The present application utilizes a newly designed cylinder profile to change the size of the cylinder space, thereby achieving the goal of adjusting the compression ratio through the volume of the cylinder and rotor profiles and the cylinder combustion chamber. This provides a greater adjustment space than the existing elliptical rotor engine which only adjusts the compression ratio through the cylinder combustion chamber.

[0026] (2) The present application adopts a wide range of adjustable compression ratios, which ensures a larger combustion chamber space and can ensure that the fuel has sufficient space to mix with the air.

[0027] (3) This application ensures that the new elliptical rotor engine can use compression ignition, ignition, and pre-combustion chamber jet ignition to burn fuel.

[0028] (4) The cylinder profile of the present application and the elliptical rotor are sealed only through three sharp points. There is no theoretical full-fit friction between the cylinder and rotor of the existing elliptical rotor engine. In actual design and construction, only the sharp points need to be strengthened and smoothly transitioned. Compared with the traditional elliptical rotor machine method of scaling the cylinder or rotor and then sealing with a sealing gasket, the sealing effect is better and the engine durability is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0030] Figure 1 This is a schematic structural diagram of the elliptical rotor engine described in an embodiment of the present application;

[0031] Figure 2 Schematic diagram comparing the working volumes enclosed by the conventional elliptical rotor cylinder profile and the novel cylinder profile and the elliptical rotor according to an embodiment of the present application;

[0032] Figure 3 The cylinder profiles with different compression ratios are generated by controlling the compression ratio adjustment coefficient α;

[0033] Figure 4 This is the positional relationship between the cylinder and the elliptical rotor, as well as a partial enlarged view, when the compression ratio adjustment coefficient α is 0.76.

[0034] Description of reference numerals:

[0035] 1-cylinder block; 2-elliptical rotor; 3-main combustion chamber; 4-cylinder combustion chamber; 5-direct injection injector; 6-spark plug; 7-pre-combustion chamber assembly; 8-intake port injector; 9-intake port; 10-exhaust port; 11-original cylinder block; 12-volume. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0037] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] See also Figure 1 As shown, this embodiment provides a method for designing a cylinder profile of a rotary engine, comprising:

[0039] Based on the basic structural information of the rotary engine and the compression ratio adjustment coefficient, the cylinder profile is generated according to the preset cylinder profile formula;

[0040] The basic structural information includes the creation radius, eccentricity, and rotation angle. The cylinder profile formula is constructed based on the creation radius, eccentricity, rotation angle, and compression ratio adjustment coefficient.

[0041] Among them, the cylinder profile formula includes:

[0042] h x =R×cos(2θ)+3×e 2 / (2×R)×(cos(8×θ)-cos(2×θ))+α×(9×e 2 / R)×(cos(5×θ)+cosθ)

[0043] h y =R×sin(2θ)+3×e 2 / (2×R)×(sin(8×θ)-sin(2×θ))+α×(9×e 2 / R)×(sin(5×θ)-sinθ)

[0044] Where R represents the radius of creation, e represents the eccentricity, α represents the compression ratio adjustment coefficient, θ represents the rotation angle, and the horizontal and vertical coordinate values of the cylinder profile are (h x , h y ).

[0045] Specifically, Figure 2A comparison is given between the volume 12 enclosed by the new cylinder 1 and the original cylinder 11 and the elliptical rotor 2. It can be seen that the new cylinder 1 and the elliptical rotor 2 enclose a new volume 12, which has more flexible control than the combustion chamber of the original elliptical rotor 2 engine.

[0046] According to the cylinder profile design method, the compression ratio of the elliptical rotor 2 engine is adjusted by the main combustion chamber 3 formed by the cylinder 1 and the rotor and the combustion chamber of the cylinder 1. The volume 12 is adjusted by the compression ratio adjustment coefficient α, and the minimum adjustment range of α is 0.76 ( Figure 4 When α is 0.76, the cylinder 1 profile, the rotor profile and the cylinder 1 profile overlap. The maximum value can be adjusted according to actual needs.

[0047] Figure 3 The cylinder 1-shaped lines with different compression ratios generated by controlling the compression ratio adjustment coefficient α are given. In this embodiment, the cylinder 1-shaped lines 1, 1(a), and 1(b) correspond to compression ratio adjustment coefficients α of 0.8, 1, and 1.2, respectively. It can be seen that by controlling the compression ratio adjustment coefficient α, the volume 12 can be adjusted. At the same time, no matter how the compression ratio adjustment coefficient α changes, the generated cylinder 1-shaped line is connected to the elliptical rotor 2-shaped line through three sharp points 13(a), 13(b), and 13(c).

[0048] In this embodiment, the cylinder body 1 profile and the elliptical rotor 2 are sealed by only three sharp points. There is no theoretical full fit friction between the cylinder body 1 and the rotor of the existing elliptical rotor 2 engine. In actual design and construction, it is only necessary to strengthen and smooth the transition at the sharp points. Compared with the traditional elliptical rotor machine that scales the cylinder body 1 or rotor and then seals it with a sealing gasket, the sealing effect is better and the engine durability is stronger.

[0049] The present application changes the size of the space between the cylinder 1 and the rotor through the newly designed cylinder 1 profile, thereby achieving a wide range of adjustable compression ratio of the engine, ensuring that the fuel is fully atomized and can fully participate in combustion.

[0050] Based on the same inventive concept, corresponding to any of the above embodiments and methods, an embodiment of the present application further provides an elliptical rotor 2 engine, comprising:

[0051] A main combustion chamber 3 formed by the cylinder body 1 and the elliptical rotor 2, and multiple combustion chambers of the cylinder body 1 connected to the main combustion chamber 3, the main combustion chamber 3 and the combustion chamber of the cylinder body 1 jointly adjust the compression ratio;

[0052] An air inlet duct 9 and an exhaust duct 10 are provided on the elliptical rotor 2 .

[0053] Specifically, in this embodiment, the compression ratio is adjusted jointly by the main combustion chamber 3 surrounded by the cylinder 1 and the rotor and the combustion chamber of the cylinder 1, and the fuel enters the main combustion chamber 3 through injection from the intake duct 9, direct injection into the cylinder, injection from the pre-combustion chamber 7, and the elliptical rotor 2 engine fully burns the fuel through combustion methods such as compression ignition, ignition, and jet ignition in the pre-combustion chamber 7, and the combustion exhaust gas is discharged through the exhaust duct 10.

[0054] Figure 1 A schematic diagram of the various components of the elliptical rotor 2 engine is given. It should be noted that this schematic diagram is only a planar schematic diagram, which shows the relative positions of the various components of the new elliptical rotor 2 engine. If a corresponding elliptical rotor engine needs to be designed and manufactured, the rotor width B, the air port lift curve of the intake duct 9 and the exhaust duct 10, and the air port size, etc. need to be considered.

[0055] In addition, it should be noted that, in addition to this embodiment, a method without a cylinder body 1 combustion chamber can also be adopted, that is, the direct injection injector 5, spark plug 6 and pre-combustion chamber assembly 7 are directly arranged in the main combustion chamber 3, which can also meet the fuel combustion needs of the engine.

[0056] In some embodiments, in response to the engine fuel combustion mode being a compression ignition mode, a direct injection injector 5 is provided in the combustion chamber of the cylinder 1;

[0057] In response to the engine fuel combustion mode being the ignition mode, a spark plug 6 is provided in the combustion chamber of the cylinder 1 and an intake duct 9 injector 8 is installed on the intake duct 9;

[0058] In response to the engine fuel combustion mode being a pre-combustion chamber jet ignition mode, a pre-combustion chamber assembly 7 is arranged in the combustion chamber of the cylinder 1. The pre-combustion chamber assembly 7 includes an active pre-combustion chamber assembly 7 (ignition device and fuel injection device) and a passive pre-combustion chamber assembly 7 (ignition device). An intake duct 9 fuel injector 8 is installed on the intake duct 9.

[0059] Specifically, in the embodiment, the direct injection injector 5, the spark plug 6 and the pre-combustion chamber assembly 7 can be installed accordingly according to the fuel combustion mode and the engine application requirements, and the adjustable compression ratio of the cylinder body 1 is combined to ensure that the elliptical rotor engine can use compression ignition, ignition, and pre-combustion chamber jet ignition to burn the fuel.

[0060] At the same time, according to the cylinder profile design method and the elliptical rotor engine, its fuel supply methods include intake port fuel injection, cylinder combustion chamber direct fuel injection, and pre-combustion chamber fuel injection.

[0061] Specifically, fuels used in compression ignition mode include diesel, biodiesel, aviation kerosene, and dimethyl ether;

[0062] Fuels in ignition mode include gasoline, hydrogen, methanol, and natural gas;

[0063] The fuels used in the jet ignition mode of the pre-combustion chamber 7 include methanol, ammonia, and natural gas. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

[0064] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of this application.

Claims

1. A method for designing a cylinder profile of a rotary engine, characterized in that: include: Based on the basic structural information of the rotary engine and the compression ratio adjustment coefficient, the cylinder profile is generated according to the preset cylinder profile formula; The basic structural information includes a creation radius, an eccentricity, and a rotation angle, and the cylinder profile formula is constructed based on the creation radius, the eccentricity, the rotation angle, and the compression ratio adjustment coefficient.

2. The method according to claim 1, characterized in that The cylinder profile formula includes: Where R represents the creation radius, e represents the eccentricity, α represents the compression ratio adjustment coefficient, and θ represents the rotation angle.

3. The method according to claim 2, wherein: The adjustment range of the compression ratio adjustment coefficient is ≥0.

76.

4. The method according to claim 1, wherein: The generated cylinder profile is connected to the elliptical rotor profile through three cusps.

5. An elliptical rotor engine, obtained by applying the rotor engine cylinder profile design method according to any one of claims 1 to 4, characterized in that: include: A main combustion chamber formed by a cylinder body and an elliptical rotor, and a plurality of cylinder combustion chambers connected to the main combustion chamber, wherein the main combustion chamber and the cylinder combustion chambers jointly adjust the compression ratio; The elliptical rotor is provided with an air inlet and an exhaust passage.

6. An elliptical rotor engine according to claim 5, characterized in that: In response to the engine fuel combustion mode being a compression ignition mode, a direct injection injector is provided in the cylinder combustion chamber.

7. The elliptical rotor engine according to claim 5, characterized in that: In response to the engine fuel combustion mode being the ignition mode, a spark plug is arranged in the cylinder combustion chamber, and an intake port injector is installed on the intake port.

8. The elliptical rotor engine according to claim 5, characterized in that: In response to the engine fuel combustion mode being a pre-combustion chamber jet ignition mode, a pre-combustion chamber assembly is provided in the cylinder combustion chamber, and an intake port injector is installed on the intake port.

9. The elliptical rotor engine according to claim 8, characterized in that: The pre-combustion chamber assembly includes an active pre-combustion chamber assembly and a passive pre-combustion chamber assembly.

10. An elliptical rotor engine according to claim 6, 7 or 8, characterized in that: Fuels in compression ignition mode include diesel, biodiesel, aviation kerosene, and dimethyl ether; Fuels in ignition mode include gasoline, hydrogen, methanol, and natural gas; Fuels used in the pre-combustion chamber jet ignition method include methanol, ammonia, and natural gas.

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