Radial seal structure for a rotary engine

Abstract

This invention discloses a radial sealing structure for a rotary engine. A triangular groove is formed at the junction of every two arc-shaped sidewalls of the stator. A matching sealing post is installed within each triangular groove, with its two sides corresponding to the two sides of the triangular groove. The side of the sealing post facing the cavity has an arc-shaped surface that contacts the rotor and forms a sealing cavity. Cylindrical spring holes are provided on both sides. A second compression spring groove is provided at the apex of the triangular section of the sealing post. A first compression spring groove is provided at the apex of the triangular section corresponding to the second compression spring groove of the sealing post, with a compression spring located between the first and second compression spring grooves. Cylindrical spring holes are installed within the two cylindrical spring holes. This invention achieves a separation seal between adjacent combustion chambers. The arc-shaped surface of the sealing post contacts the rotor through rolling friction, reducing wear on the sealing post and improving the sealing effect, thereby extending the service life of the rotary engine.

Description

Technical Field

[0001] This invention relates to the sealing structure of an engine, and more specifically to a radial sealing structure for a rotary engine. Background Technology

[0002] Rotary engines use the rotational motion of a rotor within a cylinder to control compression and emission. Unlike traditional reciprocating piston engines, rotary engines replace linear reciprocating motion with rotary motion. Compared to reciprocating engines, rotary engines have advantages such as smaller size, lighter weight, simpler structure, and higher speed, making them well-suited for applications in drones, military individual combat systems, and hybrid vehicles.

[0003] Air leakage in rotary engines mainly occurs at the contact points between the rotor side and the cylinder head surface, and between the rotor end face and the cylinder head end face. The leakage and wear at the contact point between the rotor side and the cylinder head surface are particularly severe. Therefore, improving the sealing performance at this location is crucial for enhancing the rotary engine's sealing performance and combustion efficiency.

[0004] Chinese patent CN216278193U discloses a sealing structure for a rotary engine, which includes two straight sealing plates at the included angles where three arc segments intersect, and a columnar structure for fixing the straight sealing plates. The sealing plates, which are directly mounted on the stator, are prone to scratching the contact surface with the rotor or the cylinder head end face. While reducing these scratches, good sealing performance cannot be guaranteed.

[0005] The main shortcomings of the current radial sealing structure are: the radial sealing strip is in direct contact with the combustion chamber inside the cylinder, the working environment of the radial sealing strip is harsh, and the wear of the radial sealing strip is more serious under insufficient lubrication conditions. Summary of the Invention

[0006] The technical problem to be solved by this invention is to ensure good radial sealing performance of the rotary engine while reducing the friction and wear of the radial seal, thereby extending the service life of the rotary engine.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] A radial sealing structure for a rotary engine, comprising a rotor and a stator, wherein the stator has a three-lobed cavity formed by three arc-shaped sidewalls, and the rotor is located within the three-lobed cavity. A vertically penetrating triangular groove is formed at the junction of every two arc-shaped sidewalls of the stator. A matching sealing post is disposed within each triangular groove, with two sides of the sealing post corresponding to two sides of the triangular groove. The side of the sealing post facing the cavity has an arc-shaped surface that contacts the rotor and forms a sealing cavity. Cylindrical spring holes are provided at the two sidewalls. A second compression spring groove is provided at the apex of the triangular section of the sealing post. A first compression spring groove is provided at the apex of the triangular section of the triangular groove corresponding to the second compression spring groove of the sealing post, with a compression spring located between the first and second compression spring grooves. Cylindrical spring holes are installed within the two cylindrical spring holes.

[0009] Furthermore, the triangular groove is an equilateral triangular groove, with its two sides perpendicular to the upper and lower end faces of the stator.

[0010] Furthermore, the first compression spring groove and the second compression spring groove are rectangular, and their height midpoints are located at the midpoints of the triangular groove and the sealing post, respectively.

[0011] Furthermore, the axial direction of the two cylindrical spring holes is perpendicular to the two side surfaces.

[0012] Furthermore, the first compression spring groove and the second compression spring groove are L-shaped grooves, and hooks are provided at the upper and lower ends of their bottoms for the ends of the compression springs to be inserted.

[0013] Furthermore, the arc of the sealing column facing the arc-shaped surface inside the cavity is π / 2.

[0014] Furthermore, the compression spring is a sheet metal compression spring.

[0015] Furthermore, the contact surface between the sealing column and the cylinder profile is a rounded transition, and all sharp corners of the sealing column are rounded to prevent scratching the sidewall of the groove, thereby improving the service life of the rotary engine and enhancing sealing and lubrication performance.

[0016] The working principle of this invention is as follows:

[0017] The sealing column is installed in the triangular grooves at the top of the three stators. When the rotary engine is running, due to the preset stiffness of the spring assembly (two cylindrical springs on the sides of the sealing column and one compression spring at the top of the sealing column), the sealing column is pressed against the rotor wall under the action of the compression spring, preventing gas from flowing into adjacent combustion chambers and more effectively achieving separation and sealing between adjacent combustion chambers. Cylindrical spring holes are machined on both sides of the sealing column, and two lateral cylindrical springs are symmetrically installed in the triangular grooves. The lateral cylindrical springs push the sealing column to press against the cylinder head again, achieving a seal. When the rotary engine is working, the sealing column is squeezed against the cylinder surface under the combined action of centrifugal force, the radial elastic force of the spring assembly, and the gas pressure, ensuring that the sealing column and cylinder surface remain in close contact, thus achieving separation and sealing between adjacent combustion chambers. Because the contact surface with the rotor is an arc-shaped surface, the traditional sliding friction between the sealing plate and the rotor is changed to rolling friction between the sealing column and the rotor, improving the wear resistance of the sealing column and the service life of the rotary engine.

[0018] The beneficial effects of this invention are as follows:

[0019] In this invention, the sealing column is compressed against the cylinder profile under the combined action of centrifugal force, the radial elastic force of the outer and inner spring plates, and the combustion gas pressure. This ensures that the sealing column remains in close contact with the cylinder profile, thereby achieving a separation seal between adjacent combustion chambers. Simultaneously, the arc-shaped surface of the sealing column contacts the rotor through rolling friction, reducing wear on the sealing column and improving the sealing effect, thus extending the service life of the rotary engine. Therefore, this sealing structure ensures both excellent radial sealing performance of the rotary engine and reduces frictional wear on the sealing structure, thereby extending the service life of the rotary engine. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the disassembled structure of the rotary engine in this invention patent.

[0021] Figure 2 This is a top view of the stator and rotor after assembly in this invention patent.

[0022] Figure 3 This is a schematic diagram of the stator structure in this invention patent.

[0023] Figure 4 This is a schematic diagram of the sealing column structure in this invention patent.

[0024] Figure 5 This is a schematic diagram of the L-shaped groove and the compression spring mounting structure.

[0025] In the picture:

[0026] 1—Stator;

[0027] 2—Triangular groove; 21—First compression spring groove; 22—Cylindrical spring hole;

[0028] 5—Rotor;

[0029] 6—Sealing column, 61—Second compression spring groove, 62—Arc-shaped surface, 63—Side side, 64—Triangular apex;

[0030] 8—Compression spring;

[0031] 9—Cylindrical spring;

[0032] 10—Combustion chamber pit. Detailed Implementation

[0033] The following detailed description illustrates the specific implementation methods:

[0034] like Figures 1 to 4 As shown, a radial sealing structure of a rotary engine is provided. The rotary engine includes a rotor 5 and a stator 1. The stator 1 has a three-lobed cavity surrounded by three arc-shaped sidewalls. The rotor 5 is located in the three-lobed cavity.

[0035] A vertically penetrating triangular groove 2 is formed at the junction of every two arc-shaped sidewalls of the stator 1. A matching sealing post 6 is provided in the triangular groove 2. The two sides 63 of the sealing post 6 correspond to the two sides of the triangular groove 2. The side of the sealing post 6 facing the cavity is provided with an arc-shaped surface 62, which contacts the rotor 5 and forms a sealing cavity. Cylindrical spring holes 22 are provided at the two sides 63. A second compression spring groove 61 is provided at the triangular apex 64 of the sealing post 6. A first compression spring groove 21 is provided at the triangular apex of the triangular groove 2 corresponding to the second compression spring groove 61 of the sealing post 6. A compression spring 8 is located between the first compression spring groove 21 and the second compression spring groove 61. Cylindrical spring holes 9 are installed in the two cylindrical spring holes 22.

[0036] Furthermore, the triangular groove 2 is an equilateral triangular groove, and its two sides 63 are perpendicular to the upper and lower end faces of the stator 1.

[0037] Furthermore, the first compression spring groove 21 and the second compression spring groove 61 are rectangular, and their height midpoints are located at the midpoints of the triangular groove 2 and the sealing post 6, respectively.

[0038] Furthermore, the axial directions of the two cylindrical spring holes 22 are perpendicular to the two sides 63 of the corresponding sealing post 6.

[0039] Furthermore, the depth of the triangular groove 2 is one-third of the thickness of the rotor 5.

[0040] Furthermore, the first compression spring groove 21 and the second compression spring groove 61 are L-shaped grooves, with hooks at the upper and lower ends of their bottom for the ends of the compression spring 8 to be inserted, and their depths are both half the thickness of the sealing column.

[0041] Furthermore, the compression spring 8 is a sheet metal compression spring. The height of the sealing post 6 is not greater than the thickness of the stator 1.

[0042] Furthermore, the contact surface between the sealing column 6 and the cylinder profile is a rounded transition, and all sharp corners of the sealing column 6 are rounded to prevent scratching the side wall of the groove, improve the service life of the rotary engine, and enhance sealing and lubrication performance.

[0043] Furthermore, the arc of the arc-shaped surface of the sealing column 6 facing the cavity is π / 2.

[0044] The working method of the radial sealing structure of the present invention is as follows:

[0045] The sealing column 6 is installed in the triangular grooves 2 at the top of the three stators 1. When the rotor engine is running, due to the preset stiffness of the spring assembly (two cylindrical springs 9 located on the sides of the sealing column 6 and one compression spring 8 located at the top of the sealing column 6), the sealing column 6 is in contact with the wall of the rotor 1 under the action of the compression spring 8, to prevent gas from flowing into adjacent combustion chambers, thus more effectively achieving the separation and sealing between adjacent combustion chambers. Cylindrical spring holes 22 are machined on both sides of the sealing column 6, and two lateral cylindrical springs 9 are symmetrically installed in the triangular grooves 2. Spring 9 pushes the sealing column 6 back into contact with the cylinder head, achieving a seal. When the rotary engine is operating, the sealing column 6 is pressed against the cylinder surface under the combined action of centrifugal force, the radial elastic force of the spring assembly, and the combustion gas pressure, ensuring that the sealing column 6 remains in close contact with the cylinder surface, thus achieving a separation seal between adjacent combustion chambers. Because the contact surface with the rotor 1 is an arc-shaped surface, compared with the traditional sealing plate structure, the sliding friction between the sealing plate and the rotor is changed to rolling friction between the sealing column 6 and the rotor 1, improving the wear resistance of the sealing column and the service life of the rotary engine.

[0046] The terms used to describe position and direction in this application are illustrative based on the accompanying drawings, but may be modified as needed, and all such modifications are included within the scope of protection of this application. The accompanying drawings in this application are for illustrative purposes only and do not represent actual scale.

Claims

1. A radial sealing structure for a rotary engine, the rotary engine comprising a stator (1) and a rotor (5), the stator (1) having a three-lobed cavity surrounded by three arc-shaped sidewalls, the rotor (5) being located within the three-lobed cavity, characterized in that, The radial sealing structure includes a triangular groove (2), a sealing post (6), a compression spring (8), and a cylindrical spring (9). The triangular groove (2) is a through groove that penetrates the thickness of the stator (1) at the junction of the two arc-shaped sidewalls of the stator (1). The sealing post (6) is disposed in the triangular groove (2), and the two sides (63) of the sealing post (6) correspond to the two sides of the triangular groove (2). The side of the sealing post (6) facing the cavity is provided with an arc-shaped surface (62), and the arc-shaped surface (62) is connected to the rotating... The component (5) contacts and forms a sealed cavity; cylindrical spring holes (22) are provided on the two sides (63); a second compression spring groove (61) is provided at the triangular top (64) of the sealing column (6), and a first compression spring groove (21) is provided at the triangular top of the triangular groove (2) corresponding to the second compression spring groove (61) of the sealing column (6); a compression spring (8) is located between the first compression spring groove (21) and the second compression spring groove (61); a cylindrical spring (9) is installed in the two cylindrical spring holes (22).

2. The radial sealing structure according to claim 1, characterized in that: The first compression spring groove (21) and the second compression spring groove (61) are rectangular, and their height midpoints are located at the midpoints of the triangular groove (2) and the sealing column (6) respectively.

3. The radial sealing structure according to claim 1, characterized in that: The axial direction of the cylindrical spring hole (22) is perpendicular to the side surface (63) of the corresponding sealing post (6).

4. The radial sealing structure according to claim 1, characterized in that: The first compression spring groove (21) and the second compression spring groove (61) are L-shaped grooves, and hooks are provided at the upper and lower ends of their bottom for the ends of the compression springs (8) to be inserted.

5. The radial sealing structure according to claim 1, characterized in that: The triangular groove (2) is an equilateral triangular groove, and its two sides (63) are perpendicular to the upper and lower end faces of the stator (1).

6. The radial sealing structure according to claim 4, characterized in that: The depth of the triangular groove (2) is one-third of the stator thickness; The depth of each L-shaped groove is half the thickness of the sealing column.

7. The radial sealing structure according to claim 1, characterized in that: The arc of the sealing column (6) facing the arc surface (62) inside the cavity is π / 2.

8. The radial sealing structure according to any one of claims 1-7, characterized in that: The compression spring (8) is a sheet metal compression spring.

9. The radial sealing structure according to any one of claims 1-7, characterized in that: The height of the sealing column (6) is not greater than the thickness of the stator (1).

10. The radial sealing structure according to any one of claims 1-7, characterized in that: The sealing column (6) and the cylinder profile contact surface are rounded, and all the sharp corners of the sealing column (6) are rounded to prevent scratching the side wall of the groove, improve the service life of the rotor engine, and improve sealing and lubrication performance.

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