A non-contact radial sealing device for a cycloidal rotor engine

Abstract

This invention discloses a non-contact radial sealing device for a tree-shaped rotor engine, comprising a compression spring, a radial sealing plate, a central groove, and oil holes. The compression spring is a cylindrical helical structure, vertically mounted on the top of the radial sealing plate, providing stable clamping force to ensure the radial sealing plate is tightly attached to the sealing surface. The radial sealing plate is a downwardly curved rectangular surface with tree-shaped microgrooves and a central groove on its surface, and several oil holes are provided on the central groove and tree-shaped microgrooves to increase the liquid flow path and form a stable liquid film. The central groove on the back of the radial sealing plate is used to store and distribute liquid, and the liquid is transported to the tree-shaped microgrooves through the oil holes to form a liquid film. This device utilizes the elastic deformation of the compression spring to adapt to small displacements, absorb vibrations and eccentric movements, and forms a stable liquid film on the surface of the radial sealing plate through the dynamic pressure effect, achieving a non-contact seal between solid and liquid, effectively solving the wear and thermal effects problems in traditional sealing devices.

Description

Technical Field

[0001] This invention belongs to the field of engine radial sealing technology, and relates to a non-contact radial sealing device for a cycloidal rotor engine. Background Technology

[0002] In the development of cycloidal rotor engines (similar to elliptical rotor engines), traditional contact-type sealing devices achieve a sealing effect through direct contact (solid-to-solid contact) between the radial sealing plate and the rotor. Although contact-type seals can provide a good sealing effect in a short time, the physical contact between the radial sealing plate and the rotor leads to a series of problems, such as wear, vibration, and thermal effects, thus affecting the stability and lifespan of the seal.

[0003] Furthermore, in direct contact (solid-to-solid contact) sealing designs, the sealing plate is in direct contact with the rotor surface, relying on physical contact to achieve a sealing effect, inevitably generating friction. From the perspective of friction generation, the continuous contact and relative movement between the radial sealing plate and the rotor during operation leads to the generation of frictional forces. From the perspective of wear generation, frictional forces cause wear on the surface materials of both the radial sealing plate and the rotor. Wear accumulates over time, gradually affecting the overall sealing effect. From the perspective of wear results, wear leads to uneven sealing surfaces and increased surface roughness, thereby reducing the tightness and effectiveness of the seal and increasing the risk of leakage.

[0004] Furthermore, in direct contact (solid-to-solid) sealing designs, friction induces thermal effects. The heat generated by friction raises the temperature of the contact surfaces between the seal and the rotor; as operating time increases, heat accumulates, leading to a significant increase in localized temperature. Consequently, high temperatures degrade the material properties of the radial seal and the rotor, and prolonged exposure to high temperatures and wear can cause seal failure, rendering the seal ineffective in preventing gas or liquid leakage.

[0005] Furthermore, in direct contact (solid-to-solid contact) sealing designs, extremely high installation precision is required. Any minute installation error can lead to poor sealing. Even slight deviations during installation can result in uneven contact between the sealing plate and the rotor, potentially causing excessive localized wear and leakage. Moreover, in direct contact (solid-to-solid contact) sealing designs, rotor vibration and impact are directly transmitted to the radial sealing plate during operation, leading to unstable contact between the radial sealing plate and the rotor, and fluctuating sealing performance. In addition, frequent vibration and impact can damage the sealing plate and rotor surfaces, further exacerbating wear and sealing failure. Furthermore, the dynamic pressure effect generated by direct contact (solid-to-solid contact) is insufficient, making it difficult to achieve effective dynamic pressure sealing. Under high-speed rotation or high-pressure environments, the sealing performance is unstable. Therefore, it is necessary to consider the shortcomings of direct contact (solid-to-solid contact) and find a more efficient sealing method.

[0006] Furthermore, different groove designs have varying impacts on sealing performance. Common single-layer groove types on radial sealing plates include T-grooves, arc grooves, and V-grooves, each with its specific advantages and disadvantages. Specifically, the T-groove's sealing performance is due to its transverse and longitudinal grooves forming a T-shaped cross structure; it operates at a relatively low temperature (around 67°C) under stable conditions. The drawback of the T-groove is its poor temperature adaptability; its temperature control is relatively low under stable operation, only about 67°C. In high-temperature environments, the sealing performance of the T-groove is limited, leading to seal failure. Similarly, the arc groove's sealing performance is due to its deep groove design, suitable for thermodynamic sealing. The drawback of the arc groove is that while the deep groove design provides good sealing performance, the backflow of liquid within the groove is poor, meaning the liquid flow is not smooth enough, easily forming stagnant areas. Because of the poor backflow, liquid on the high-pressure side cannot effectively return to the low-pressure side, causing leakage from the high-pressure side before the low-pressure side, reducing sealing efficiency and leading to seal failure. Specifically, the V-groove sealing performance is due to its V-shaped design, suitable for hydrodynamic sealing, and relatively low leakage rate. The drawback of the V-groove is that its hydrodynamic effect is not as strong as other deep groove designs; that is, under hydrodynamic conditions, the V-groove cannot effectively maintain the stability of the liquid film. This insufficient hydrodynamic effect results in a lower opening force. This lower opening force may not provide sufficient sealing strength, especially in applications where the engine requires a high hydrodynamic effect. Therefore, it is necessary to improve the radial seal of cycloidal rotor engines (or elliptical rotor engines). Summary of the Invention

[0007] The purpose of this invention is to overcome the defects of existing technologies and to solve the problem of increased gap and seal failure in the sealing system of cycloidal rotor engines caused by contact sealing (solid-solid contact). A novel radial non-contact sealing device that utilizes gasoline to generate an oil film is proposed. Non-contact sealing is achieved through solid-liquid contact, ensuring the integrity of the internal radial seal of the cycloidal rotor engine (or elliptical rotor engine).

[0008] The non-contact radial sealing device for a cycloidal rotor engine (or elliptical rotor engine) described in this invention is achieved through the following technical solution:

[0009] A non-contact radial sealing device for a cycloidal rotor engine (or elliptical rotor engine) includes a compression spring 101 and a radial sealing plate 102.

[0010] The compression spring 101 is connected to the radial sealing plate 102 by mechanical fixing and is vertically installed on the top of the radial sealing plate 102. The stable clamping force provided by the compression spring 101 ensures that the radial sealing plate 102 is tightly attached to the sealing surface.

[0011] The compression spring 101 has a cylindrical spiral structure. One end of the compression spring 101 is fixed to the top of the central groove 104 on the top of the radial sealing plate 102 by welding, providing fixing capacity and withstanding large compressive and tensile forces. The compression spring 101 is evenly distributed at several fixed positions on the top of the radial sealing plate 102, corresponding to the positions of the tree-shaped microgroove 103 and the central groove 104, to ensure that the compression spring 101 fits snugly against the sealing contact surface of the radial sealing plate 102.

[0012] Furthermore, the surface of the radial sealing plate 102 is formed with several slender, branching, tree-like microgrooves 103 using high-precision integrated machining technology. These microgrooves exhibit a tree-like distribution, increasing the liquid flow path and forming a stable liquid film. A central groove 104 at the top of the radial sealing plate 102 extends across its entire width. The tree-like microgrooves 103 are distributed around the central groove 104, and their branching structure extends outwards from both sides of the central groove 104. A significant height difference is formed between the central groove 104 and the radial sealing plate 102, providing structural support and stability. The radial sealing sheet 102 has a central groove 104 formed on its back using high-precision integrated machining technology, forming an annular channel for storing and distributing liquid. An oil hole 105 is provided on the radial sealing sheet 102, penetrating the thickness of the radial sealing sheet 102 and connecting the central groove 104 on the back to the tree-shaped microgroove 103 on the surface. This allows liquid to flow from the central groove 104 into the tree-shaped microgroove 103, and allows the liquid to flow between the central groove 104 and the tree-shaped microgroove 103, forming a liquid film. The bottom of the radial sealing sheet 102 has two symmetrical arc shapes.

[0013] Specifically, the radial sealing plate 102 includes a tree-shaped microgroove 103, a central channel 104, and an oil hole 105;

[0014] The tree-like microgroove 103 is shaped like a tree branch, with multiple branches resembling the forked structure of a tree branch, spreading outwards from the center to guide liquid flow and form a liquid film. Each branch extends outwards from the center, ensuring that the liquid flow path covers the entire radial sealing sheet 102, and that the liquid is evenly distributed across the entire surface of the radial sealing sheet 102, increasing the contact area with the sealed surface. When the liquid flows in the tree-like microgroove 103, it forms a uniform liquid film covering the surface of the radial sealing sheet 102. The tree-like microgroove 103 is directly integrally formed on the surface of the radial sealing sheet 102 and is connected to the central channel 104 through the oil hole 105 to ensure smooth liquid flow.

[0015] The central channel 104 is a long, raised structure in the shape of a regular cuboid. The central channel 104 is a long, longitudinal, narrow groove on the back of the radial sealing plate 102. The sides and bottom of the central channel 104 are integrated with the radial sealing plate 102. The length of the central channel 104 is the same as the width of the radial sealing plate 102, ensuring that the central channel 104 can provide support throughout the width of the radial sealing plate 102. The central channel 104 is located in the center of the radial sealing plate 102 and extends through its entire width. Tree-like microgrooves 103 are distributed around the central channel 104, and the branching structure of the tree-like microgrooves 103 extends outwards from both sides of the central channel 104. Oil holes 105 are distributed at the bottom of the central channel 104 for flow passage. The central channel 104 and the radial sealing plate 102 form a significant height difference, which provides structural support and positioning.

[0016] The oil hole 105 is a circular hole penetrating the thickness of the radial sealing sheet 102, connecting the back and surface of the radial sealing sheet 102 to form a liquid channel from the central channel 104 to the tree-shaped microgroove 105. The diameter of the oil hole 105 is designed to prevent liquid from stagnating or clogging inside the hole. Several oil holes 105 are evenly arranged in three rows along the longitudinal direction of the central channel 104, evenly distributed from the beginning to the end of the central channel 104. Each oil hole 105 is located at the bottom centerline of the central channel 104, and each oil hole 105 is evenly spaced to ensure the uniform distribution of liquid on the entire surface of the radial sealing sheet 102. Several oil holes 105 are evenly arranged in three rows along the longitudinal direction of the central channel 104, evenly distributed from the beginning to the end of the central channel 104. One end of the oil hole 105 opens at the bottom of the central channel 104, guiding the liquid in the central channel 104 into the oil hole 105, ensuring that the liquid can smoothly enter the distribution area from the storage area.

[0017] Preferably, the radial sealing sheet 102 has a rectangular curved surface structure, and the whole presents a downward curved arc with a curvature of 0.001 to 0.005.

[0018] Preferably, the compression spring 101 is made of high-strength metal wire, and the material of the compression spring 101 includes stainless steel spring wire (such as 1Cr18Ni9, 0Cr19Ni10), chromium silicon spring steel wire (such as 55CrSiA) and nickel alloy spring wire (such as Inconel 600, Inconel 625).

[0019] Preferably, the compression spring 101 has 3 to 6 springs, a spring constant of 0.49 N / m, a compression length of 2.6 mm, a maximum compression of 2.25 mm, 5 effective coils, and a coil spacing of 0.7 mm, to ensure that the elastic deformation of the compression spring 101 can adapt to the small displacement of the radial sealing plate 102 and absorb the impact force caused by vibration and eccentric movement.

[0020] Preferably, the depth of the tree-shaped microgroove 103 is... The number of tree-shaped grooves is 8 to 12.

[0021] Preferably, the diameter of the oil hole 105 is 1 mm, and the number of holes is 8 to 12.

[0022] Additionally, the rotor mechanism of the cycloidal rotor engine (or elliptical rotor engine) consists of a three-lobed cavity formed by three arc-shaped sidewalls, located within the three-lobed cavity of the stator.

[0023] Additionally, the submechanism of the cycloidal rotor engine (similar to an elliptical rotor engine) has three arc-shaped sidewalls, which together form a three-lobed cavity.

[0024] The non-contact radial sealing device for a cycloidal rotor engine (or elliptical rotor engine) described in this invention has the following functions for each component:

[0025] The function of the compression spring 101 is to provide clamping force and absorb vibration and eccentric motion. Specifically, the compression spring 101 is vertically mounted on the top of the radial sealing plate 102, and provides continuous clamping force through its elastic deformation to ensure that the radial sealing plate 102 is tightly attached to the sealing surface and forms an initial sealing state; specifically, the compression spring 101 can adapt to the vibration and eccentric motion of the rotor during operation and maintain a stable sealing effect.

[0026] The radial sealing plate 102 functions to provide structural support and positioning, achieve liquid distribution, and provide a sealing effect. Specifically, the central top of the radial sealing plate 102 is integrally machined into a central groove 104, providing structural support and positioning to ensure the stability of the radial sealing plate 102 in the cycloidal rotor engine (or elliptical rotor engine). Specifically, the central groove 104 of the radial sealing plate 102 can store and distribute liquid, and transport the liquid to the tree-like microgroove 103 through the oil hole 105, ensuring that the liquid can be evenly distributed on the surface of the radial sealing plate 102 to form a stable liquid film. Specifically, the radial sealing plate 102 is the main sealing element, forming a liquid film through the tree-like microgroove 103 on its surface and the central groove 104 on its back, achieving a non-contact seal.

[0027] The function of the tree-like microgrooves 103 is to guide the flow of liquid and form a liquid film. Specifically, the tree-like microgrooves 103 are distributed in a tree-like pattern, increasing the liquid flow path and ensuring that the liquid can be evenly distributed on the surface of the radial sealing sheet 102. Specifically, when the liquid flows in the tree-like microgrooves 103, it forms a uniform liquid film that covers the surface of the radial sealing sheet 102, achieving a non-contact sealing effect.

[0028] The central channel 104 functions as a liquid storage, distribution, and positioning mechanism. Specifically, the central channel 104 has an elongated groove structure that extends across the entire width of the radial sealing plate 102, providing structural support and increasing the rigidity and stability of the sealing plate. Specifically, the central channel 104 and the radial sealing plate 102 form a height difference, ensuring the positioning and stability of the sealing plate 102 within the engine through integrated machining. Specifically, the central channel 104 is located on the back of the radial sealing plate 102, storing liquid to ensure an adequate liquid supply. Specifically, the central channel 104 delivers liquid to the tree-like microgroove 103 through the oil hole 105, ensuring that the liquid is evenly distributed on the surface of the radial sealing plate 102.

[0029] The function of the oil holes 105 is to provide a liquid channel that allows for uniform liquid distribution. Specifically, the oil holes 105 penetrate the thickness of the radial sealing sheet 102, connecting the central channel 104 to the tree-shaped microgroove 103. The three rows of oil holes 105 ensure that liquid can flow from the central channel 104 into the tree-shaped microgroove 103. Specifically, the oil holes 105 are arranged longitudinally and uniformly along the branching points of the central channel 104 and the tree-shaped microgroove 103, ensuring that the liquid can be evenly distributed on the surface of the radial sealing sheet 102 to form a stable liquid film.

[0030] The non-contact radial sealing device for a cycloidal rotor engine (or elliptical rotor engine) described in this invention operates as follows: Before starting the cycloidal rotor engine (or elliptical rotor engine), external pressure is applied to form a liquid film on the sealing end face. When the liquid film is formed after pre-start pressure, the external pressure is simultaneously reduced until a stable pressure is achieved to prevent liquid backflow from the oil hole 105. At this point, the liquid film is stabilized by changing from hydrostatic pressure to hydrodynamic pressure. When the rotor moves, due to the viscosity of the liquid, it also moves. Because of the presence of microgrooves, the cross-section of the liquid suddenly increases as it passes through the microgrooves, causing a sharp drop in velocity and an increase in pressure, thus forming a stable liquid film. The presence of this liquid film achieves a non-contact sealing effect.

[0031] The non-contact radial sealing device for a cycloidal rotor engine (or elliptical rotor engine) of this invention operates on the following principle: Through the synergistic action of a compression spring 101, radial sealing plate 102, tree-shaped microgrooves 103, central channel 104, and oil hole 105, the non-contact radial sealing device utilizes a liquid film to form a non-contact seal, effectively adapting to the vibration and eccentric motion of the rotor during operation, thereby achieving a highly efficient and stable sealing effect. The working process is divided into four stages: initial installation and pressurization, liquid film formation, liquid film maintenance during operation, and adaptive adjustment and solid-liquid contact sealing effect.

[0032] S1. Initial installation and pressurization: The compression spring 101 is connected to the top of the radial sealing plate 102 by welding or mechanical fixing and is installed vertically to ensure that the compression spring 101 is evenly distributed in several fixed positions of the radial sealing plate 102; then, the liquid is introduced from the outside into the central channel 104 on the back of the radial sealing plate 102 by an external pressurization system.

[0033] S2. Liquid film formation: External liquid flows into the central channel 104 on the back of the radial sealing sheet 102 through a pressurized system; then, the liquid flows from the central channel 104 through the oil hole 105 that penetrates the thickness of the radial sealing sheet 102 and flows evenly into the tree-like microgroove 103 on the surface of the radial sealing sheet 102; then, the liquid flows in the tree-like microgroove 103 and gradually forms a uniform liquid film that covers the surface of the radial sealing sheet 102, providing an initial non-contact seal.

[0034] S3. Liquid film maintenance: The compression spring 101 provides a continuous clamping force to ensure that the radial sealing plate 102 is in close contact with the sealing surface and adapts to the small displacement and vibration of the rotor during operation; when the rotor starts to rotate, the flow of liquid in the tree-shaped microgroove 103 generates a dynamic pressure effect, maintains the stability of the liquid film, ensures that the liquid film is evenly distributed on the surface of the radial sealing plate 102, and maintains the sealing effect.

[0035] S4. Adaptive adjustment and solid-liquid contact sealing: The elastic deformation of the compression spring 101 can absorb the impact force caused by the eccentric motion of the rotor during operation, ensuring stable contact between the radial sealing plate 102 and the rotor; the oil holes 105 are evenly arranged longitudinally along the central channel 104, ensuring that the liquid can be evenly distributed in the tree-like microgroove 103 to form a stable liquid film and prevent liquid stagnation or blockage; when the liquid flows in the tree-like microgroove 103, due to the dendritic distribution and branching structure of the microgroove, the liquid can be evenly distributed along the predetermined path to form a stable liquid film, preventing gas leakage and achieving efficient sealing.

[0036] The non-contact radial sealing device for a cycloidal rotor engine (or elliptical rotor engine) described in this invention has the following installation steps:

[0037] S1. Preparations before installation: Prepare high-strength metal wire compression spring 101, stainless steel or chromium silicon spring wire, nickel alloy spring wire, and radial sealing plate 102 material; prepare welding equipment, fixing clips, and installation tools.

[0038] S2. Install the compression spring 101: Depending on specific requirements, select either welding or snap-fit ​​fixing method to fix the compression spring 101. Welding involves using welding equipment to fix one end of the compression spring 101 to the top of the radial sealing plate 102, ensuring a firm weld. Snap-fit ​​fixing uses snap-fit ​​devices to fix the compression spring 101 to the top of the radial sealing plate 102, ensuring the snap-fit ​​is secure. Next, evenly distribute the compression springs 101 at several fixing positions on the top of the radial sealing plate 102, ensuring that each spring's position corresponds to the tree-shaped microgroove 103 and the central channel 104.

[0039] S3. Install radial sealing plate 102: Install radial sealing plate 102 on the part that needs to be sealed, and ensure that it is firmly installed by mechanical fixing; check the flatness of the surface of radial sealing plate 102 to ensure that it can evenly contact the sealing surface.

[0040] S4. Liquid system connection: Through an external pressurization system, liquid is introduced into the central channel 104 on the back of the radial sealing plate 102 via pipeline; ensuring that the liquid can flow evenly into the tree-shaped micro-groove 103 through the oil hole 105 to form an initial liquid film.

[0041] S5. Clamping force check: Ensure that the clamping force provided by the compression spring 101 makes the radial sealing plate 102 fit tightly against the sealing surface, and check whether the clamping length and maximum compression of the compression spring 101 meet the design requirements.

[0042] S6. Liquid film formation check: Activate the external pressurization system to ensure that the liquid forms a uniform liquid film in the tree-shaped microchannel 103.

[0043] Compared with existing technologies, the beneficial effects of this invention are as follows: The tree-shaped microgroove non-contact sealing device of this invention solves the technical problems of traditional contact sealing devices in terms of installation accuracy, vibration phenomenon, radial displacement, and wear through the adaptive adjustment, buffering effect, and stability of the liquid film. Compared with existing technologies, this invention has significant advantages in terms of ease of installation, sealing stability, and service life, achieving a highly efficient sealing effect.

[0044] Specifically, this invention reduces the impact of vibration. It employs a non-contact sealing device with tree-like microgrooves, forming a stable sealing layer between the sealing end faces through a liquid film. This avoids direct contact (solid-solid contact) between the sealing plate and the rotor, achieving a non-contact seal through solid-liquid contact. The formation and action of the liquid film achieves solid-liquid contact, avoiding the direct solid-solid contact problem present in traditional contact seals. The stable sealing layer formed by the liquid film between the sealing end faces acts as a buffer, reducing friction and wear, absorbing and mitigating vibration, reducing thermal effects, and improving the stability and service life of the sealing device.

[0045] Specifically, this invention reduces the accuracy requirements for installation. It employs a non-contact sealing device with tree-like microgrooves, forming a liquid film through external pressure. This liquid film has self-adjusting properties. During installation, even with certain installation deviations, the externally pressurized liquid film can self-adjust to fill minute gaps and achieve effective sealing. Due to the self-adjusting nature of the liquid film, the accuracy requirements for the sealing device are greatly reduced, simplifying the installation process and reducing installation costs.

[0046] Specifically, this invention reduces eccentricity failure. It employs a non-contact sealing method, where a liquid film forms a stable sealing layer between the sealing end faces, adapting to rotor radial displacement. The liquid film can adapt to the rotor's instantaneous radial displacement, maintaining a sealing effect. Even with large rotor radial displacement, the liquid film can still fill minute gaps, preventing leakage and ensuring a stable seal over a long period.

[0047] Specifically, this invention reduces leakage caused by wear. It employs a non-contact seal, and the tree-like microgroove structure optimizes liquid flow and backflow, preventing liquid stagnation on the high-pressure side and effectively returning it to the low-pressure side, thus reducing leakage. A liquid film forms between the sealing end faces, placing them in solid-liquid contact, significantly reducing wear. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 This is a schematic diagram of the structure of a non-contact radial sealing device for a cycloidal rotor engine according to the present invention;

[0050] Figure 2 This is a top view of the radial sealing sheet of a non-contact radial sealing device for a cycloidal rotor engine according to the present invention;

[0051] Figure 3 This is a schematic diagram of the interior of the radial sealing sheet of a non-contact radial sealing device for a cycloidal rotor engine according to the present invention;

[0052] Figure 4 This is a schematic diagram of the tree-shaped microgroove planar structure of a non-contact radial sealing device for a cycloidal rotor engine according to the present invention;

[0053] Figure 5 This is a schematic diagram showing the installation position of the non-contact radial sealing device for a cycloidal rotor engine according to the present invention on the entire cycloidal rotor engine.

[0054] Figure 6 This is a schematic diagram of the pressurized state before startup of the non-contact radial sealing device for a cycloidal rotor engine according to the present invention;

[0055] Figure 7 This is a schematic diagram showing the operating state of a non-contact radial sealing device for a cycloidal rotor engine according to the present invention;

[0056] Figure 8 This is a schematic diagram of the dynamic pressure effect of a non-contact radial sealing device for a cycloidal rotor engine according to the present invention.

[0057] Reference numerals in the attached drawings: Compression spring 101; Radial sealing plate 102; Tree-shaped microgroove 103; Central channel 104; Oil hole 105. Detailed Implementation

[0058] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0059] In the non-contact radial sealing device for a cycloidal rotor engine (or elliptical rotor engine) described in this invention, "liquid" refers to the specific substance used to form the liquid film, such as gasoline, the fuel for the cycloidal rotor engine; "fluid" refers to the properties and behaviors exhibited by the liquid during its flow. In the tree-like microgroove 103 (i.e., the tree-like microgroove 103 on the surface of the radial sealing plate 102), the flow of liquid generates a pressure difference due to the action of the groove walls; this phenomenon can be explained by fluid dynamics. Therefore, although "liquid" and "fluid" can be used interchangeably under certain operating conditions, clearly distinguishing between the two in the technical description helps to more accurately understand and explain the working principle of this invention.

[0060] Specifically, "fluid" is a broad term referring to any substance that can flow and does not have a fixed shape. Fluids include liquids, gases, and plasmas; fluids can exist in different states and can deform and flow under external forces. Specifically, "liquid" is a specific form of fluid, having a certain volume but no fixed shape, capable of flowing, and possessing surface tension; typical liquids, such as gasoline in engines, remain liquid at normal temperature and pressure.

[0061] Furthermore, the terms “fluid” and “liquid” are used in a broader sense when describing flow and fluid dynamics; however, the term “liquid” is used when specifically referring to a fluid in a particular form (such as gasoline in a cycloidal rotor engine).

[0062] Furthermore, in the application of the non-contact radial sealing device of the tree-shaped microgroove 103 described in this invention, "liquid" is used as both a lubricating and sealing medium. The "liquid" (such as gasoline, the fuel for a cycloidal rotor engine (or elliptical rotor engine)) flows within the tree-shaped microgroove 103, forming a liquid film to provide a sealing effect. The role of the "liquid" in the tree-shaped microgroove 103 is that the liquid (such as gasoline) enters the tree-shaped microgroove 103 through the oil hole 105, forming a liquid film; the "liquid" flows between the radial sealing plate 102 and the rotor surface, providing lubrication and sealing effects. From a hydrodynamic perspective, during relative motion, the "liquid" flows at high speed within the tree-shaped microgroove 103. Due to the action of the groove walls, the "liquid" generates a pressure difference, creating a dynamic pressure effect. Hydrodynamic principles can explain how the "liquid" generates and maintains a pressure difference within the tree-shaped microgroove 103, thereby maintaining the stability of the liquid film.

[0063] Furthermore, in the technical solutions described in this invention, when specifically describing the behavior of a "liquid," "liquid" refers to the specific substance used to form a liquid film, such as gasoline or lubricating oil (grease) in a cycloidal rotor engine (or elliptical rotor engine). For example, "the liquid enters the tree-like micro-groove through small holes to form a liquid film." In the technical solutions described in this invention, when explaining flow and dynamic effects, "fluid" refers to the dynamic characteristics exhibited by the liquid during its movement. For example, "when the liquid flows at high speed in the tree-like micro-groove, a pressure difference is generated in the fluid due to the action of the groove wall."

[0064] The purpose of this invention is to overcome the defects of existing technologies and to solve the problem of increased gaps and seal failure in the sealing system of cycloidal rotor engines (elliptical rotor engines) caused by contact sealing (solid-solid contact). This invention proposes a novel radial non-contact sealing device that utilizes gasoline to generate an oil film to ensure the integrity of the internal radial seal of the cycloidal rotor engine (elliptical rotor engine).

[0065] like Figure 1 The diagram shows a schematic of a non-contact sealing device with radial tree-like microgrooves according to the present invention, which mainly includes a compression spring 101, a radial sealing plate 102, a sealing contact surface of the radial sealing plate 102, a tree-like microgroove 103 on the surface of the radial sealing plate 102, a central groove 104 on the back of the radial sealing plate 102, and an oil hole 105 on the surface of the radial sealing plate 102.

[0066] Specifically, the functions of each component in the non-contact sealing device with radial tree-shaped microgrooves are as follows: the compression spring 101 provides clamping force to ensure tight contact with the sealing surface of the radial sealing plate 102; the radial sealing plate 102, as the main sealing element, has tree-shaped microgrooves 103 on its surface and a central channel 104 on its back, connected by an oil hole 105 to achieve the formation and maintenance of a liquid film; the tree-shaped microgrooves 103 on the surface of the radial sealing plate 102 are mainly used to form a liquid film; the central channel 104 on the back of the radial sealing plate 102 is mainly used to store and distribute liquid; the oil hole 105 between the central channel and the tree-shaped microgrooves on the surface of the radial sealing plate 102 is mainly used to allow liquid flow.

[0067] Compression spring 101

[0068] like Figure 1 As shown in the 3D diagram, the compression spring 101 is connected to the radial sealing plate 102 by welding or a fixed buckle, and is vertically installed on the top of the radial sealing plate 102. It is evenly distributed to provide a stable clamping force. The tree-shaped microgrooves 103 on the surface of the radial sealing plate 102 and the central channel 104 on the back are connected by oil holes 105 to realize the formation and maintenance of the liquid film. The elastic deformation of the compression spring 101 adapts to the vibration and eccentric movement during operation, ensuring that the contact surface between the compression spring 101 and the radial sealing plate 102 is in contact, maintaining a non-contact sealing effect.

[0069] Furthermore, the compression spring 101 is a cylindrical helical structure made of high-strength metal wire (such as stainless steel or carbon steel); the helical spacing and diameter of the compression spring 101 are precisely calculated to ensure stable mechanical properties and elasticity during compression and tension.

[0070]

[0071] The compression spring 101 is placed vertically on top of the radial sealing plate 102, and the compression spring 101 is evenly distributed at several positions on the top of the radial sealing plate 102 to ensure that the radial sealing plate 102 can be evenly stressed and avoid excessive or insufficient local stress. The position of the compression spring 101 corresponds to the position of the tree-shaped microgroove 103 and the central channel 104 of the radial sealing plate 102, providing uniform clamping force.

[0072] The compression spring 101 can be connected in a fixed or movable manner. The fixed connection is a welded connection, in which one end of the compression spring 101 is fixed to the top of the radial sealing plate 102 by welding, providing fixation and withstanding greater compressive and tensile forces. The movable connection is a fixed buckle, in which the compression spring 101 is connected to the radial sealing plate 102 by the fixed buckle, allowing for quick replacement or adjustment of the compression spring 101.

[0073] The connection relationships between the compression spring 101 and other components include the connection between the compression spring 101 and the radial sealing plate 102, the connection between the contact surfaces of the compression spring 101 and the radial sealing plate 102, the connection between the compression spring 101 and the tree-shaped microgroove 103, the connection between the compression spring 101 and the central channel 104, and the connection between the compression spring 101 and the oil hole 105. Specifically, the connection relationship between the compression spring 101 and the radial sealing plate 102 is that the compression spring 101 is fixed to the top of the radial sealing plate 102, and welding or snap-fit ​​ensures that the compression spring 101 can stably provide clamping force; the clamping force provided by the compression spring 101 ensures that the sealing plate is tightly attached to the sealing surface, forming an initial sealing state; under the clamping force of the compression spring 101, the radial sealing plate 102 maintains tight contact with the sealing contact surface, ensuring a sealing effect. Specifically, the connection relationship between the contact surfaces of the compression spring 101 and the radial sealing plate 102 is that the clamping force provided by the compression spring 101 makes the radial sealing plate 102 tightly attached to the sealing contact surface, achieving an effective seal. Specifically, the connection between the compression spring 101 and the tree-shaped microgroove 103 is such that the tree-shaped microgroove 103 is located on the surface of the radial sealing plate 102, and the compression spring 101 is installed on top of the radial sealing plate 102, ensuring that the liquid film formation of the tree-shaped microgroove 103 is not affected while providing clamping force. Specifically, the connection between the compression spring 101 and the central channel 104 is such that the radial sealing plate 102 has a central channel 104 on its back, and the central channel 104 is connected to the tree-shaped microgroove 103 on the surface of the radial sealing plate 102 through an oil hole 105; thus, the compression spring 101 is fixed to the top of the radial sealing plate 102, and the direct physical connection to the central channel 104 allows the clamping force provided by the spring to help the liquid enter the tree-shaped microgroove 103 through the oil hole 105. Specifically, the connection between the compression spring 101 and the oil hole 105 is such that the oil hole 105 connects the central groove 104 on the back of the radial sealing plate 102 and the tree-shaped microgroove 103 on the surface of the radial sealing plate 102; thus, the compression spring 101 is fixed to the top of the radial sealing plate 102, and the oil hole 105 is located inside the radial sealing plate 102, ensuring that the liquid can flow smoothly through the oil hole 105 into the tree-shaped microgroove 103 to form a liquid film, thereby achieving the stability of the liquid film.

[0074] The working principle of the compression spring 101 is to provide clamping force to adapt to vibration and eccentric motion, thereby maintaining the liquid film. Specifically, the spring has a length of 5 mm in its natural state, and by compressing it to 2.6 mm, it provides a continuous clamping force, causing the radial sealing plate 102 to adhere tightly to the sealing surface, forming an initial sealing state. Specifically, during the operation of the cycloidal rotor engine (or elliptical rotor engine), the elastic deformation of the compression spring 101 can adapt to the small displacement of the radial sealing plate 102, absorbing the impact force from vibration and eccentric motion, and maintaining a stable sealing effect. Specifically, under the action of liquid pressure, liquid enters the tree-like microgrooves 103 on the surface through the central groove 104 and oil hole 105 on the back of the radial sealing plate 102, forming a stable liquid film. The continuous clamping force provided by the compression spring 101 ensures that the liquid film is evenly distributed between the sealing end faces, maintaining a stable non-contact sealing effect.

[0075] Radial sealing plate 102

[0076] like Figure 1 As shown in the 3D diagram, the radial sealing plate 102 is fixed to the surface to be sealed by bolts or clips. The surface has tree-shaped microgrooves 103 for forming a liquid film, and the back has a central channel 104 for storing and distributing the liquid. Liquid flows from the central channel 104 into the tree-shaped microgrooves 103 through the oil hole 105, forming a liquid film. During operation of the cycloidal rotor engine (or elliptical rotor engine), the dynamic pressure effect maintains the stability of the liquid film, ensuring a non-contact sealing effect, reducing friction and leakage, and adapting to vibrations and eccentric movements during operation.

[0077] The bottom of the radial sealing sheet 102 has two symmetrical arc shapes, which are symmetrical arc rectangles with an arc curvature of 0.001 to 0.005, adapting to different radial sealing sheet 102 surfaces. The surface of the radial sealing sheet 102 is covered with slender, branched, tree-like microgrooves 103. These tree-like microgrooves 103 are distributed in a tree-like pattern to increase the liquid flow path and form a stable liquid film. The back of the radial sealing sheet 102 is designed with a central channel 104, which is used to store and distribute liquid. The radial sealing sheet 102 is provided with an oil hole 105, which connects the central channel 104 on the back and the tree-like microgrooves 103 on the surface, allowing liquid to flow from the central channel 104 into the tree-like microgrooves 103. The bottom of the radial sealing sheet 102 has two symmetrical arc shapes.

[0078] The radial sealing plate 102 is horizontally placed on the surface of the cycloidal rotor engine (or elliptical rotor engine) that needs to be sealed, ensuring tight contact with the sealing surface of the cycloidal rotor engine (or elliptical rotor engine). Further, the surface of the cycloidal rotor engine (or elliptical rotor engine) that needs to be sealed is the rotor surface or the surface of related components in the cycloidal rotor engine (or elliptical rotor engine), including the rotor surface, cylinder surface, or other related component surfaces. Specifically, the rotor surface is a smooth cylindrical or other geometric shape used for the high-precision rotational motion of the cycloidal rotor engine (or elliptical rotor engine); the rotor is a key component of the cycloidal rotor engine (or elliptical rotor engine), and its surface needs to be effectively sealed to prevent gas or liquid leakage. Specifically, the cylinder surface is a smooth cylindrical inner wall; the radial sealing plate 102 does not directly contact the cylinder inner wall surface, but it also needs to be effectively sealed to ensure that the gas or liquid inside the cylinder does not leak to the outside. Specifically, other components of the cycloidal rotor engine (or elliptical rotor engine) (such as end caps and the inner wall of the housing) need to be kept flat and smooth to ensure a sealing effect.

[0079] The radial sealing sheet 102 can be connected by bolts or snap-fit ​​connections. Bolt or snap-fit ​​connections ensure that the radial sealing sheet 102 fits tightly against the surface requiring sealing, providing an effective seal. Specifically, bolt connections use bolts to fix the edge of the sealing sheet to the radial sealing surface 102; bolt connections require pre-designed bolt holes on the radial sealing surface 102 and corresponding bolt holes on the sealing contact surface; bolt connections provide a robust fixing method suitable for high-pressure and vibration environments. Snap-fit ​​connections use snaps to fix the radial sealing sheet 102 to the sealing contact surface, ensuring correct alignment of the tree-shaped microgroove and the central channel; snap-fit ​​connections offer a flexible fixing method to adapt to different installation requirements.

[0080] The connection relationships between the radial sealing plate 102 and its components include the connection between the radial sealing plate 102 and the tree-shaped microgroove 103, the connection between the radial sealing plate 102 and the central channel 104, the connection between the radial sealing plate 102 and the oil hole 105, and the connection between the radial sealing plate 102 and the contact surface to be sealed. Specifically, the connection relationship between the radial sealing plate 102 and the tree-shaped microgroove 103 is as follows: the tree-shaped microgroove 103 is directly formed on part of the surface of the radial sealing plate 102, and the tree-shaped microgroove 103 is integrally formed with the surface of the radial sealing plate 102; the radial sealing plate 102 forms a continuous liquid film through the liquid flow in the tree-shaped microgroove 103, and the liquid is evenly distributed on the sealing surface, reducing friction and wear, and providing stable sealing performance. Specifically, the connection between the radial sealing plate 102 and the central channel 104 is as follows: the central channel 104 is directly formed on a part of the back of the radial sealing plate 102, and the central channel 104 is integrally formed with the back of the radial sealing plate 102; the central channel 104 forms an annular channel on the back of the radial sealing plate 102, which stores liquid introduced from the outside, and distributes the liquid to the tree-shaped microgroove 103 through the oil hole 105, providing a continuous liquid supply to the tree-shaped microgroove 103 and maintaining the seal. Specifically, the connection between the radial sealing plate 102 and the oil hole 105 is that the oil hole 105 is an opening designed on the radial sealing plate 102. The oil hole 105 penetrates the radial sealing plate 102 and connects the central groove 104 on the back to the tree-shaped micro groove 103 on the surface. The oil hole 105 is a channel for liquid flow. The oil hole 105 connects the central groove 104 and the tree-shaped micro groove 103, ensuring that liquid flows from the central groove 104 into the tree-shaped micro groove 103, allowing liquid to flow between the two components and form a liquid film.

[0081] The working principle of the radial sealing sheet 102 is based on the formation of an initial liquid film by external pressure and the maintenance of the stability of the liquid film by the dynamic pressure effect. Through the design of the tree-shaped microgroove 103 and the central channel 104 on the back, the liquid forms a uniform liquid film on the surface of the radial sealing sheet 102, providing a non-contact sealing effect. The dynamic pressure effect generates high-pressure and low-pressure areas during operation, which promotes the circulation of liquid, maintains the continuity and stability of the liquid film, and ensures the sealing performance and durability of the radial sealing sheet 102 under high temperature and high pressure conditions.

[0082] Example 1: Manufacturing and Installation of the Tree-Shaped Microgroove Radial Sealing Device of the Present Invention

[0083] In one specific embodiment, a tree-like microgroove 103 is formed by selecting a high-strength material and using laser engraving technology to create grooves on the surface of the radial sealing plate. A compression spring 101 is fixed to the radial sealing plate 102, ensuring that the sealing device provides appropriate clamping force when not pressurized. Finally, the sealing device is installed at the internal apex of the stator of the cycloidal rotor engine, connected to the liquid path, and undergoes preliminary testing. This embodiment ensures the manufacturing precision and secure installation of the sealing device, effectively preventing gas leakage and achieving a highly efficient seal.

[0084] The manufacturing method of the components of the tree-like microgroove radial sealing device of the present invention is as follows: the surface of the radial sealing sheet 102 is grooved by laser engraving technology to form a tree-like microgroove 103; the compression spring 101 is fixed to the radial sealing sheet 102 to provide clamping force; the stator is the fixed part of the cycloidal rotor engine (elliptical rotor engine), and the sealing device is finally fixed at the apex of the stator.

[0085] The process of manufacturing the radial sealing plate 102 is as follows: First, a high-strength, wear-resistant material is selected to make the radial sealing plate 102, such as stainless steel or a high-strength alloy. Next, based on fluid dynamics principles, the specific shape, depth, and width (groove depth of the tree-like microgroove) of the tree-like microgroove 103 are designed. Finally, high-precision laser engraving technology is used to create grooves on the surface of the radial sealing sheet 102; during the engraving process, it is ensured that the shape and size of the tree-shaped microgroove 103 accurately meet the design requirements.

[0086] The tree-shaped microgroove radial sealing device of this invention requires the fixed connection between the compression spring 101 and the radial sealing plate 102. Select a suitable material and specifications for the compression spring 101, ensuring it has sufficient clamping force and elasticity. Weld the bottom of the compression spring 101 to the back of the sealing plate 102. Ensure the weld is secure and there is no looseness between the spring and the sealing plate. If a detachable design is required, a retaining clip can be used to fix the compression spring 101 to the back of the radial sealing plate 102. Finally, check the connection between the compression spring 101 and the radial sealing plate 102 to ensure there is no looseness or deformation. Adjust the spring preload according to design requirements to ensure it provides appropriate clamping force in the unpressurized state.

[0087] The tree-shaped microgroove radial sealing device of this invention is installed as follows: First, the assembled sealing device (including the radial sealing plate 102 and the compression spring 101) is positioned at the inner apex of the engine stator. The sealing device is securely fixed to the stator using bolts or fasteners to ensure it does not loosen during engine operation. Next, the fluid path is installed by connecting the external pressurization system to the tree-shaped microgroove 103 of the radial sealing plate 102, ensuring that the fluid can smoothly enter the tree-shaped microgroove 103.

[0088] Finally, after installation, conduct an inspection to ensure all components are securely connected and without looseness. Activate the external pressurization system to conduct an initial test, observing the liquid entering the tree-like microchannel and forming an initial liquid film.

[0089] Example 2: Test of initial liquid film formation of the tree-like microgroove radial sealing device of the present invention

[0090] In one specific embodiment, the tree-shaped microgroove 103 radial sealing device needs to confirm that the liquid can smoothly enter the tree-shaped microgroove 103 and form a uniform initial liquid film, ensuring that the tiny gap between the radial sealing sheet 102 and the rotor surface is filled by the liquid film, thereby achieving a preliminary sealing effect.

[0091] The specific testing equipment includes: an external pressurization system for providing liquid pressurization and controlling liquid flow and pressure; a pressure sensor for monitoring pressure changes before and after the liquid enters the tree-shaped microchannel 103; a flow sensor for recording the flow rate of the liquid into the tree-shaped microchannel 103; a data acquisition system for recording pressure and flow data in real time; and, if necessary, a vision inspection system for observing the liquid film formation process through a high-precision camera.

[0092] The specific testing steps include: First, ensuring the sealing device is properly installed and the liquid path is correctly connected; calibrating the pressure and flow sensors to ensure accurate measurements. Next, starting the external pressurization system and gradually increasing the liquid pressure; then adjusting the pressure output of the pressurization system to allow the liquid to enter the tree-like microgroove 103 through the liquid path. During the test, initial pressure and flow data are recorded when the liquid begins to enter the tree-like microgroove 103; and the flow and distribution of the liquid in the tree-like microgroove 103 are observed using a visual inspection system to ensure uniform liquid entry into the tree-like microgroove 103, forming a continuous liquid film. Pressure and flow data are recorded in real time to monitor changes during the liquid film formation process. Once the liquid film has stabilized, pressure and flow data under stable conditions are recorded to ensure the liquid film covers the entire sealing surface and fills all minute gaps.

[0093]

[0094] Analysis of initial liquid film formation: First, in the initial stage, the external pressurization system provides a pressure of 0.5 MPa, and the liquid flow rate is 1.5 L / min. Liquid begins to enter the tree-like microgroove 103, with the flow sensor recording a flow rate of 1.5 L / min and the pressure sensor recording a pressure of 0.5 MPa. Second, during liquid film formation, as liquid enters the tree-like microgroove 103, the pressure gradually decreases to 0.48 MPa, while the flow rate remains at 1.5 L / min. The liquid film gradually forms, covering the tree-like microgroove 103. Third, in the stable liquid film state, after the liquid film gradually stabilizes, the pressure drops to 0.41 MPa, and the flow rate is 1.3 L / min. The test observed that the liquid film uniformly covers the tree-like microgroove 103, ensuring that the minute gap between the radial sealing plate 102 and the rotor surface is filled by the liquid film, achieving a preliminary sealing effect.

[0095] Experimental results: Analysis of pressure changes shows that the initial high pressure gradually decreases, indicating that the liquid gradually enters the tree-like microgroove 103 and forms a liquid film. The pressure decreases slightly in the steady state, indicating that the liquid flow tends to stabilize after the liquid film forms. Analysis of flow rate changes shows that the initial flow rate is relatively high, indicating that the liquid enters the tree-like microgroove 103 at a relatively fast speed. The flow rate decreases slightly in the steady state, indicating that the liquid flow is stable and the liquid film coverage is uniform after the liquid film forms. Observation of the liquid film shows that it uniformly covers the tree-like microgroove 103, ensuring that the tiny gaps between the radial sealing plate 102 and the rotor surface are filled by the liquid film, achieving a preliminary sealing effect.

[0096] like Figure 2 The diagram shows a top view of the radial sealing plate 102, which includes the radial sealing plate 102, a central channel 104, and oil holes 105 arranged along the central channel. The radial sealing plate 102, the central channel 104, and the oil holes 105 are interconnected to achieve liquid flow and distribution, forming a stable liquid film. The radial sealing plate 102 is placed horizontally on the surface to be sealed and secured with bolts or clips. The central channel 104 is integrally formed on the back of the sealing plate for storing and distributing liquid. The oil holes 105 penetrate the sealing plate, connecting the central channel 104 to the tree-like microgrooves 103 on the surface, ensuring that liquid flows from the central channel 104 into the tree-like microgrooves 103, forming a continuous liquid film that provides effective lubrication and sealing. The entire radial sealing plate 102 system relies on external pressure and hydrodynamic effects to maintain the uniformity and stability of the liquid film, thereby achieving a highly efficient non-contact sealing effect.

[0097] Specifically, the functions of the radial sealing plate 102 and each component in the non-contact sealing device of the radial tree-shaped microgroove 103 are as follows:

[0098] The radial sealing plate 102 is fixed to the sealing surface by bolts or clips to ensure stable installation; the radial sealing plate 102 covers the surface to be sealed and provides an effective seal by forming a liquid film. The central channel 104 is used to store liquid and distributes the liquid evenly into the tree-shaped microchannel 103 through the oil hole 105; the central channel 104 provides sufficient liquid storage capacity to ensure an uninterrupted and sufficient liquid supply.

[0099] The oil hole 105 penetrates the radial sealing plate 102, connecting the central channel 104 with the tree-shaped microgroove 103 on the surface, ensuring smooth liquid flow; then the liquid flows into the tree-shaped microgroove 103 through the oil hole 105, forming a uniform liquid film, providing lubrication and sealing.

[0100] Radial sealing plate 102

[0101] like Figure 2 As shown in the top view, the radial sealing piece 102 has a rectangular curved surface structure, and the curvature of the radial sealing piece 102 is 0.001 to 0.005; Top view ( Figure 2 The radial sealing plate 102 has a flat surface for covering areas requiring sealing; its rectangular shape can adapt to different sealing requirements, ensuring sufficient coverage area; the radial sealing plate 102 is fixed to the horizontal sealing contact surface by bolts or clips, ensuring that the radial sealing plate 102 will not move or loosen during the operation of the cycloidal rotor engine (or elliptical rotor engine); the radial sealing plate 102 is made of high-strength material and has high temperature resistance and wear resistance to ensure sealing performance under high pressure and high temperature environments.

[0102] The radial sealing plate 102 and the central channel 104 are connected in such a way that the central channel 104 and the radial sealing plate 102 are integrally formed. During the manufacturing process, the central channel 104 is directly formed on the back side of the radial sealing plate 102, forming a whole with the radial sealing plate 102. Specifically, when manufacturing the mold, the shape and position of the central channel 104 are precisely designed on the back side of the radial sealing plate 102. Through injection molding, die casting or other molding processes, the central channel 104 and the radial sealing plate 102 are formed together to ensure a tight fit and integrity between the two. If necessary, precision machining technology (such as CNC machining) is used to ensure that the size and shape of the central channel 104 are accurate.

[0103] The radial sealing plate 102 is connected to the oil hole 105 by direct drilling. After the radial sealing plate 102 is formed, the oil hole 105 is formed on the sealing plate by drilling or molding. The oil hole 105 penetrates the thickness of the radial sealing plate 102 and connects the central channel 104 and the tree-shaped micro-groove 103. Specifically, after the central channel 104 is formed, it is precisely positioned and drilled to ensure the connection between the oil hole 105 and the central channel 104. The oil hole 105 penetrates the entire thickness of the radial sealing plate 102 to ensure that liquid can flow smoothly from the central channel 104 on the back to the tree-shaped micro-groove 103 on the front. Finally, the penetration and fluid flow performance of the oil hole 105 are tested to ensure that liquid can pass smoothly through the oil hole 105.

[0104] The radial sealing plate 102 and the tree-shaped microgroove 103 are connected by being directly formed on the surface of the radial sealing plate 102, ensuring that the surface of the radial sealing plate 102 has a uniform groove structure for liquid flow and liquid film formation. Specifically, during mold manufacturing, the shape and position of the tree-shaped microgroove 103 are precisely designed on the surface of the radial sealing plate 102; through injection molding, die casting, or other molding processes, the tree-shaped microgroove 103 and the radial sealing plate 102 are formed together to ensure a tight fit and integrity between the two; if necessary, precision machining techniques (such as CNC machining) are used to ensure that the size and shape of the tree-shaped microgroove 103 are accurate.

[0105] The radial sealing plate 102 and the central channel 104 are connected in such a way that the central channel 104 and the radial sealing plate 102 are integrally formed to ensure the integrity of the structure and the reliability of the liquid flow; the central channel 104 is used to store liquid and transport the liquid to the tree-shaped micro-groove 103 through the oil hole 105.

[0106] The connection between the radial sealing plate 102 and the oil hole 105 is such that the oil hole 105 penetrates the thickness of the radial sealing plate 102, extending from the central channel 104 directly to the tree-shaped micro-groove 103, ensuring smooth liquid flow. The oil hole 105 serves as a liquid channel for liquid flow, guiding the liquid stored in the central channel 104 into the tree-shaped micro-groove 103 to form a liquid film.

[0107] The radial sealing plate 102 is connected to the tree-shaped microgroove 103 by having the tree-shaped microgroove 103 directly formed on the surface of the radial sealing plate 102, ensuring a uniform groove structure for liquid flow and film formation. Liquid flows into the tree-shaped microgroove 103 from the central channel 104 through the oil hole 105, forming a uniform liquid film on the sealing plate surface, providing lubrication and sealing.

[0108] Central groove 104 on the back of radial sealing plate 102

[0109] like Figure 2As shown in the top view, the central channel 104 is an integrally formed, longitudinally elongated groove on the back of the radial sealing plate 102, forming a whole with the radial sealing plate 102, ensuring that the central channel 104 will not separate or leak during operation; the central channel is elongated and arranged longitudinally along the radial sealing plate 102; the central channel 104 is located in the central part of the radial sealing plate 102, arranged longitudinally, and runs through the length of the radial sealing plate 102 from top to bottom, ensuring that the liquid can be evenly distributed to the entire surface of the radial sealing plate 102; the depth and width of the central channel 104 are designed to be evenly distributed, capable of storing sufficient liquid, and the liquid is evenly distributed into the tree-shaped microgroove 103 through the oil hole 105.

[0110] The connection between the central channel 104 and the radial sealing plate 102 is that the central channel 104 and the radial sealing plate 102 are manufactured through an integral molding process. That is, the central channel 104 is directly formed on the back side of the radial sealing plate 102 during the sealing plate molding process, becoming part of the overall structure of the sealing plate. Specifically, in the mold design of the radial sealing plate 102, the shape and position of the central channel 104 are precisely designed on the back side of the radial sealing plate 102; then, through injection molding, die casting or other molding processes, the central channel 104 is molded together with the sealing plate to ensure a tight fit and integrity between the two; if necessary, precision machining technology (such as CNC machining) is used to ensure that the size and shape of the central channel 104 are accurate.

[0111] The connection between the central channel 104 and the oil hole 105 is such that the oil hole 105 is located at the bottom of the central channel 104, directly penetrating the thickness of the radial sealing sheet 102. The design of the oil hole 105 allows liquid to flow from the central channel 104 into the tree-shaped micro-groove 103. Specifically, after the central channel 104 is formed, it is precisely positioned and drilled to ensure the connection between the oil hole 105 and the central channel 104. The oil hole 105 penetrates the entire thickness of the radial sealing sheet 102, ensuring that liquid can flow smoothly from the central channel 104 on the back to the tree-shaped micro-groove 103 on the front. After manufacturing, testing is conducted to test the penetration and fluid flow performance of the oil hole 105, ensuring that liquid can pass smoothly through the oil hole 105.

[0112] The central channel 104 and the tree-shaped micro-groove 103 are indirectly connected through an oil hole 105. Specifically, the central channel 104 delivers liquid to the tree-shaped micro-groove 103 via the oil hole 105, achieving a liquid flow connection between the two. The oil hole 105 penetrates the radial sealing plate 102, connecting the central channel 104 and the tree-shaped micro-groove 103. Liquid flows from the central channel 104 into the tree-shaped micro-groove 103 through small holes, forming a liquid film on the surface of the radial sealing plate 102.

[0113] The connection between the central channel 104 and the radial sealing plate 102 is such that the central channel 104 and the radial sealing plate 102 are integrally formed, creating a single structure. This ensures the stability and durability of the central channel 104 and allows liquid to flow effectively within the sealing plate. Specifically, the central channel 104 provides space for storing liquid and delivers it to the tree-like microgroove 103 through the oil hole 105. Regarding the integrity of the radial sealing plate 102, the central channel 104 is formed directly on the back of the radial sealing plate 102. As part of the radial sealing plate 102, there are no seams or connection points between the central channel 104 and the radial sealing plate 102, reducing the risk of potential leakage.

[0114] The connection between the central channel 104 and the small holes 105 is such that the oil holes 105 are located at the bottom of the central channel 104, penetrating the thickness of the radial sealing plate 102, directly connecting the central channel 104 to the tree-shaped micro-groove 103. This ensures that liquid can flow from the central channel 104 into the tree-shaped micro-groove 103, achieving effective liquid transport. Specifically, the oil holes 105 penetrate the radial sealing plate 102 from the bottom of the central channel 104, ensuring that liquid can flow from the central channel 104 into the tree-shaped micro-groove 103; the oil holes 105 are evenly arranged along the longitudinal direction of the central channel 104, ensuring uniform liquid distribution.

[0115] The connection between the central channel 104 and the tree-shaped microgroove 103 is indirect. Specifically, the central channel 104 delivers liquid to the tree-shaped microgroove 103 through the oil hole 105, achieving a liquid flow connection between the two and forming a liquid film that provides lubrication and sealing. Specifically, the liquid in the central channel 104 flows into the tree-shaped microgroove 103 through the oil hole 105, forming a liquid film on the surface of the radial sealing sheet 102.

[0116] The central channel 104 operates within the radial sealing plate 102 by storing and uniformly distributing liquid, ensuring that the liquid flows evenly into the tree-shaped microgrooves 103, thereby forming a stable liquid film on the surface of the radial sealing plate and providing effective lubrication and sealing. Specifically, in terms of liquid storage, the central channel 104 is designed as a long, narrow groove located on the back of the radial sealing plate 102, and its main function is to store externally introduced liquids (such as lubricating oil or engine fuel). Liquid is injected into the central channel 104 through an external pressurization device, filling its storage space. The design of the central channel 104 ensures that the liquid supply is always sufficient during the operation of the radial sealing plate 102, preventing any impact on the sealing effect due to insufficient liquid. Specifically, in terms of uniform liquid distribution, the central channel 104 distributes the stored liquid evenly into the tree-shaped microgrooves 103 through multiple oil holes 105, ensuring that the liquid covers the entire surface of the radial sealing plate 102. Under external pressure or gravity, liquid flows from the central channel 104 into the tree-shaped micro-groove 103 through the oil holes 105; the oil holes 105 are evenly arranged along the longitudinal direction of the central channel 104 to ensure that the liquid can flow evenly into each tree-shaped micro-groove 103 to form a continuous liquid film.

[0117] Oil holes 105 on the surface of radial sealing plate 102

[0118] like Figure 2 As shown in the top view, the oil hole 105 is a circular hole penetrating the thickness of the radial sealing plate 102, connecting the back and surface of the radial sealing plate 102 to form a liquid channel from the central channel 104 to the tree-shaped microgroove 103. The oil hole 105 is circular in shape with a moderate diameter design, ensuring smooth liquid flow and a moderate flow rate without affecting the overall structural strength of the radial sealing plate 102. This helps to ensure uniform liquid flow and prevents liquid from stagnating or clogging in the hole. Several oil holes 105 are evenly arranged in a row along the longitudinal direction of the central channel 104. The oil holes 105 are evenly distributed from the beginning to the end of the central channel 104; each oil hole 105 is located at the branching position of each tree-shaped microgroove 103 in the central channel 104, and each oil hole 105 is evenly spaced to ensure the uniform distribution of liquid on the entire radial sealing plate 102 surface, forming three rows of oil holes 105. All oil holes 105 together control the flow of engine oil, forming an effective lubricating film to achieve lubrication; several oil holes 105 are evenly arranged in three columns along the longitudinal direction of the central channel 104, and are evenly distributed from the beginning to the end of the central channel 104.

[0119] Specifically, the principle by which the oil hole 105 sprays oil for lubrication in the cycloidal rotor engine is as follows:

[0120] Firstly, regarding the high-pressure driving of oil flow: The oil hole 105 is under high pressure, ensuring that the engine oil can be forcibly ejected from the oil hole 105 and enter the lubrication system of the cycloidal rotor engine. In the high-pressure environment of the cycloidal rotor engine's lubrication system, the engine oil is pumped to the high-pressure area (such as the oil hole 105). This high-pressure state can be generated by an oil pump or other compression mechanisms; and high pressure, as the main power source driving the oil flow, ensures that the engine oil has sufficient power to be ejected through the oil hole 105. Specifically, high pressure allows the engine oil to overcome internal friction and external resistance, forcibly ejecting it from the oil hole 105. Even though the size of the oil hole 105 is small, the engine oil can still flow rapidly under the impetus of high pressure and enter the parts that need lubrication. In terms of the directional flow of oil, fluid always flows from the high-pressure area to the low-pressure area. For the oil hole 105, the high-pressure area inside the cycloidal rotor engine forces the engine oil to flow to the relatively low-pressure area; the high-pressure area and the low-pressure area are located at different positions inside the cycloidal rotor engine. From a lubrication path perspective, because the pressure inside the oil hole 105 is much higher than the pressure inside the cycloidal rotor engine, the oil will naturally spray out from the oil hole 105 and enter the parts that need lubrication, such as between the rotor and the radial seal 102. This directional flow ensures that the oil can reach and cover the key components of the cycloidal rotor engine, forming an effective oil film. From a lubrication effect perspective, driven by high pressure, the oil can form an oil film in the key parts of the cycloidal rotor engine. This oil film not only reduces direct contact between mechanical parts and reduces wear, but also helps cool and clean these parts (such as the rotor and the radial seal 102), extending the life of the cycloidal rotor engine. From an oil quantity control perspective, although the size of the oil hole 105 is small, the high pressure ensures that a sufficient amount of oil can be continuously sprayed into the interior of the cycloidal rotor engine, providing stable lubrication without causing problems due to excessive oil volume. Through the high pressure inside the oil hole 105, the engine oil can be sprayed out from the oil hole 105 and flow to the internal components of the cycloidal rotor engine with lower pressure, ensuring the normal operation of the lubrication system. The design of the oil hole 105 utilizes the principle of pressure difference to ensure that the engine oil can flow continuously and reach the areas that need lubrication, thereby providing the necessary lubrication protection.

[0121] Secondly, the size of the oil orifice 105 controls the flow rate. Regarding the relationship between high pressure and the size of the oil orifice 105, a high-pressure area exists inside the oil orifice 105. This high pressure propels the oil through the orifice. Despite the high-pressure pushing effect, the orifice size is extremely small. The size of the oil orifice 105 directly determines the amount of oil passing through it. Due to the small orifice diameter, even in the high-pressure area inside the cycloidal rotor engine, the amount of oil sprayed is still limited, preventing excessive oil from flowing into the cycloidal rotor engine and thus avoiding the negative effects of insufficient oil supply. From the perspective of avoiding over-lubrication, if the oil volume is too large, it will cause the lubricating oil film inside the cycloidal rotor engine to become too thick, thereby affecting the normal operation of the cycloidal rotor engine, such as increasing fluid resistance and reducing mechanical efficiency. Excessive oil can easily lead to oil pressure imbalance within the system, especially in complex lubrication systems. Localized excessive oil supply may affect the oil pressure stability of the entire system, leading to insufficient lubrication or oil pressure failure in other parts. For precise lubrication, the dimensions of the oil orifice 105 are precisely designed and calculated to ensure the exact amount of oil sprayed is appropriate. This amount is sufficient to form an effective oil film, providing necessary lubrication protection, but not excessive, which could affect the performance of the cycloidal rotor engine or cause other problems. Strict control over the dimensions of the oil orifice 105 ensures that all parts inside the cycloidal rotor engine receive the appropriate amount of lubricating oil, preventing overall oil pressure imbalance due to over-lubrication in any one area. Due to the precise control of the oil orifice 105's dimensions, lubricating oil can be continuously supplied at an appropriate flow rate, ensuring that key components of the cycloidal rotor engine are always in a good lubrication state. The oil film formed by the precisely controlled oil flow effectively reduces direct contact between the rotor and the radial seal 102, thereby reducing wear and extending the life of the cycloidal rotor engine. Therefore, the precisely designed dimensions of the oil orifice 105 ensure that even under high internal pressure, the amount of oil sprayed is controlled, guaranteeing that lubricating oil is provided within the appropriate flow range, avoiding problems such as over-lubrication or oil pressure imbalance caused by excessive oil supply.

[0122] Specifically, the principle behind setting multiple oil injection positions for the oil holes 105 in the central channel 104 and the tree-shaped micro-groove 103 is as follows:

[0123] Firstly, the multiple contact points of the oil holes 105 satisfy dynamic lubrication adaptability. The contact position between the rotor and the radial seal 102 is not fixed during the operation of the cycloidal rotor engine, but changes continuously with its operation. Due to the rotational and cycloidal motion characteristics of the rotor, the contact area between the radial seal 102 and the rotor moves during the operation of the cycloidal rotor engine. This dynamic change in contact position requires the lubrication system to adapt to different contact positions rather than providing lubrication at a fixed location, ensuring lubrication effectiveness throughout the entire operation. To address the changing contact points between the rotor and the radial seal 102, multiple oil holes 105 are provided in the central groove 104 and the branching areas of the tree-like microgrooves 103 on the radial seal 102, forming three rows of oil holes 105 distributed across the left, middle, and right sides of the entire radial seal 102. This ensures that regardless of the location of the contact point, there is always an oil hole 105 providing lubrication. When lubricating oil is sprayed through these oil holes 105, an oil film forms in the contact area. This oil film not only provides the necessary lubrication but also acts as non-contact lubrication, reducing direct friction between mechanical parts. In terms of lubrication coverage, since lubricating oil can be sprayed from multiple oil holes 105, covering the entire possible contact area, it ensures that all contact points of the cycloidal rotor engine receive sufficient lubrication protection at different stages of operation. The multiple oil holes 105 achieve non-contact lubrication, effectively reducing direct contact between the rotor and the radial seal 102, reducing wear, and improving engine life and efficiency. Simultaneously, the presence of the oil film also helps reduce frictional losses, improving the overall performance of the cycloidal rotor engine. By arranging multiple oil holes 105 on the radial seal 102, the lubrication system can flexibly respond to dynamic changes in the contact points between the rotor and the radial seal 102. Regardless of the contact point's location, there is always an oil hole 105 that can effectively provide lubricating oil, ensuring the formation of the oil film. The multi-point lubrication mechanism of the oil holes 105 significantly reduces failures caused by wear, extends the service life of the cycloidal rotor engine, and ensures efficient lubrication throughout operation. Therefore, the oil holes 105 inject oil into the engine under high pressure, and the oil volume is controlled by the size of the oil holes 105 to ensure adequate lubrication. The arrangement of multiple oil holes 105 ensures that a necessary oil film can be formed between the rotor and the radial seal 102 at different contact points, achieving continuous and effective lubrication and avoiding direct contact and wear between mechanical parts.

[0124] Secondly, the principle of setting multiple oil injection positions for the oil holes 105 in the central channel 104 and the tree-shaped microgroove 103 is mainly to cope with the dynamic changes in the contact points between the rotor and the radial sealing plate 102, ensuring that the lubricating oil can form an effective oil film at different contact positions, thereby achieving non-contact lubrication. From the perspective of the real-time changing contact points, in the cycloidal rotor engine, the contact points between the rotor and the radial sealing plate 102 are dynamic, and therefore the changes in contact points are determined by the rotation of the rotor and the cycloidal motion characteristics. As the cycloidal rotor engine operates, the contact points will move to different positions on the radial sealing plate 102, for example, from the middle (i.e., one row of oil holes 105 in the central channel) to the left or right side (i.e., the two rows of oil holes 105 in the tree-shaped microgroove 103). From the perspective of the lubrication requirements of the cycloidal rotor engine, because the contact points are constantly changing, the lubrication system must be able to flexibly adapt to these changes, ensuring that lubricating oil can be provided in a timely manner regardless of the position of the contact point. Setting multiple oil holes 105 can meet the lubrication requirements. If the lubricating oil cannot cover all the contact points, it will cause some areas inside the cycloidal rotor engine to lack lubrication, thus preventing the formation of the necessary oil film.

[0125] From the limitations of single-point lubrication, if the lubrication system only has one oil injection hole in the middle of the radial seal 102, when the contact point is biased to the left or right (i.e., the tree-shaped microgroove 103 does not have two rows of oil holes 105), the lubricating oil cannot effectively reach these areas that are off-center (i.e., the row of oil holes 105 in the central groove). In this case, the contact area on the left or right (i.e., the tree-shaped microgroove 103 does not have two rows of oil holes 105) cannot form a sufficient oil film, resulting in insufficient local lubrication. From the perspective of wear and friction risks, the area where no oil film is formed will directly lead to mechanical contact between the rotor and the radial seal 102, increasing the risk of friction and wear. In the long run, this local friction may cause excessive wear of the radial seal 102 and the rotor, ultimately affecting the engine's lifespan and performance. Therefore, in a cycloidal rotor engine, the lubrication system must be able to adapt to dynamic changes in contact position. If only one oil injection point is provided in the middle of the radial sealing plate 102 (e.g., a single row of oil holes 105 in the central channel), the lubrication system cannot adequately cover all contact points, resulting in insufficient lubrication in the left and right side areas (i.e., the tree-shaped microgroove 103 does not have two rows of oil holes 105), thereby increasing the risk of friction and wear. Therefore, to ensure that all contact points are adequately lubricated, the lubrication system needs to provide oil injection holes in multiple locations. That is, the tree-shaped microgroove 103 of this invention does not have two rows of oil holes 105, but has a single row of oil holes 105 in the central channel, so that an oil film can be formed at different contact points to protect the critical components of the cycloidal rotor engine.

[0126] The multi-point oil injection design, by setting multiple oil injection positions (i.e., oil holes 105) in the central channel 104 and the tree-shaped microgroove 103, ensures that the lubricating oil can cover all possible contact points, avoiding lubrication blind spots. The oil film formed by the lubricating oil in the contact area achieves non-contact lubrication, reducing mechanical friction and wear, lowering frictional resistance, and thus improving the operating efficiency and service life of the cycloidal rotor engine. To achieve coverage of all contact points through multi-point oil injection, multiple oil injection positions are set in the central channel 104 and the tree-shaped microgroove 103. The multi-point layout of these oil injection holes 105 ensures that no matter where the contact point between the rotor and the radial seal 102 is located, there is always an oil injection hole 105 that can directly supply lubricating oil to that contact point. Through this multi-point oil injection hole 105 design, the coverage of the lubrication system is significantly expanded, avoiding lubrication blind spots. Compared to the design of a single oil injection hole 105, the layout of the multi-point oil injection hole 105 effectively avoids the situation where lubricating oil cannot be obtained at certain contact points, and ensures that the lubricating oil can be evenly distributed in all possible contact areas (i.e., three rows of oil holes 105 are distributed on the central groove 104 of the radial sealing plate 102 and the tree-shaped microgroove 103), thereby achieving comprehensive lubrication protection.

[0127] Regarding oil film formation, when lubricating oil is sprayed through these oil injection holes 105, a thin oil film forms in the contact area between the rotor and the radial seal 102. This oil film provides lubrication and effectively isolates the mechanical components, keeping the rotor and radial seal 102 in a non-contact state. From the perspective of non-contact lubrication, direct contact between the rotor and radial seal 102 is avoided by forming an oil film, reducing mechanical friction. The multi-point oil injection holes 105 achieve non-contact lubrication, thereby reducing wear and extending the service life of the cycloidal rotor engine. Non-contact lubrication also reduces frictional resistance during the operation of the cycloidal rotor engine, reduces energy loss, and improves the overall efficiency of the cycloidal rotor engine. The cycloidal rotor engine can operate more easily, improving fuel efficiency and reducing stress on mechanical components.

[0128] Third, the multi-point oil injection holes 105 ensure effective lubrication of the system through adaptability and stability. By distributing three rows of oil holes 105 on the central groove 104 and the tree-shaped microgrooves 103 of the radial sealing plate, the lubrication system can automatically adapt to changes in contact points, reducing its dependence on the relative position of the rotor and the radial sealing plate 102. This means that the lubrication system can maintain reliability and stability under various operating conditions, and will not suffer from insufficient lubrication or failure due to movement of contact points.

[0129] By ensuring uniform lubricant distribution, the multi-point oil injection holes 105 effectively prevent excessive lubricant in some areas and insufficient lubricant in others. Through the positional design of the multiple oil injection holes 105, the lubricant can be evenly distributed throughout the entire contact area. This uniform lubrication distribution ensures that all contact points receive the appropriate amount of lubricant, avoiding wear caused by poor local lubrication. Over-lubrication leads to an excessively thick oil film, increasing fluid resistance and even easily causing lubricant overflow and leakage. The multi-point oil injection hole 105 design, by precisely controlling the oil supply of each injection hole 105, prevents over-lubrication in certain areas, ensuring that the lubricant is at the appropriate level in all areas.

[0130] Specifically, the connection relationship between the oil hole 105 and each component is as follows:

[0131] The oil hole 105 is connected to the radial sealing plate 102 by extending the thickness of the radial sealing plate 102 through the oil hole 105, either by direct drilling or by mold forming. Specifically, during the manufacturing of the radial sealing plate 102, the oil hole 105 is formed on the sealing plate by drilling or mold forming. The position of the oil hole 105 is arranged evenly in a row along the longitudinal direction of the central channel 104 according to the design requirements of the radial sealing plate 102. At the same time, an oil hole 105 is provided on each tree-shaped microgroove 103. The small holes 104 spray out machine oil to form an oil film, ensuring lubrication between the rotor and the radial sealing plate 102.

[0132] The oil hole 105 is connected to the central channel 104 in such a way that one end of the oil hole 105 opens into the bottom of the central channel 104, guiding the liquid in the central channel 104 into the middle row of oil holes 105. Specifically, when manufacturing the radial sealing sheet 102, the central channel 104 is formed, and oil holes 105 are opened at the bottom of the central channel 104; through the design of the oil holes 105, the liquid flows from the central channel 104 into the oil holes 105, ensuring that the liquid can smoothly enter the distribution area from the storage area.

[0133] The oil hole 105 is connected to the tree-shaped microgroove 103 by having one end of the oil hole 105 open to the bottom of the tree-shaped microgroove 103, allowing liquid to be introduced into the tree-shaped microgroove 103 on both sides from the two rows of oil holes 105. Specifically, while forming the tree-shaped microgroove 103 on the surface of the radial sealing plate 102, it is ensured that the connection points of the oil hole 105 and the tree-shaped microgroove 103 are precisely aligned. That is, an oil hole 105 is set at each branch fork of the tree-shaped microgroove 103, which, together with the oil hole 105 of the central channel 104, controls the flow of engine oil, forming an effective lubricating film to achieve lubrication. Furthermore, liquid flows from the central channel 104 into the tree-shaped microgroove 103 through the oil hole 105, forming a liquid film covering the surface of the sealing plate.

[0134] The connection between the oil hole 105 and the radial sealing plate 102 is such that the oil hole 105 penetrates the entire thickness of the radial sealing plate 102, extending from the central groove 104 on the back side to the tree-shaped microgroove 103 on the surface; the oil hole 105 and the radial sealing plate 102 are tightly connected by integral molding or post-processing to ensure smooth liquid flow and structural stability.

[0135] The connection between the oil hole 105 and the central channel 104 is such that the oil hole 105 opens directly into the bottom of the central channel 104, allowing liquid to smoothly enter the oil hole 105 from the central channel 104; the oil hole 105 serves as a flow channel, guiding the liquid stored in the central channel 104 to the surface of the radial sealing sheet 102.

[0136] The connection relationship of the tree-shaped microgroove 103 is such that the oil hole 105 opens at the bottom of the tree-shaped microgroove 103, ensuring that liquid can flow into the tree-shaped microgroove 103 from the oil hole 105; through the oil hole 105, liquid flows into the tree-shaped microgroove 103 from the central channel 104, forming a uniform liquid film that covers the surface of the radial sealing sheet 102, providing lubrication and sealing.

[0137] The working principle of the oil holes 105 in the radial sealing plate 102 is to guide liquid flow and assist in liquid distribution. Specifically, the oil holes 105 connect the central channel 104 and the tree-shaped micro-grooves 103 on the radial sealing plate 102, ensuring that liquid can smoothly flow from the central channel 104 into the tree-shaped micro-grooves 103, thereby forming a stable liquid film. Specifically, in terms of liquid guidance, the oil holes 105 act as channels for liquid flow, guiding the liquid stored in the central channel 104 to the tree-shaped micro-grooves 103; under the action of external pressure or gravity, the liquid is pushed into the central channel 104, and then flows through the oil holes 105 into the tree-shaped micro-grooves 103, forming a continuous liquid film. Specifically, in terms of assisting in liquid distribution, the oil holes 105 are evenly arranged along the longitudinal direction of the central channel 104, ensuring that the liquid can be evenly distributed into each tree-shaped micro-groove 103. The uniform arrangement of the oil holes 105 ensures that each tree-shaped microgroove 103 receives sufficient liquid; consequently, the liquid flow rate and volume through the oil holes 105 are designed to meet the requirements for forming a liquid film in the tree-shaped microgroove 103. Finally, the liquid flows from the oil holes 105 into the tree-shaped microgroove 103, filling each branch of the tree-shaped microgroove 103. The liquid flows within the tree-shaped microgroove 103, forming and maintaining a liquid film, reducing direct contact between the radial sealing plate 102 and the sealed surface, and providing lubrication and sealing.

[0138] Example 3: The tree-shaped microgroove radial sealing device of the present invention achieves non-contact sealing.

[0139] In one specific embodiment, the equipment required for the non-contact sealing of the tree-shaped microgroove radial sealing device includes: a radial sealing plate 102 with tree-shaped microgrooves 103 on its surface and a central channel 104 on its back for storing and distributing liquid; a compression spring 101 fixed to the radial sealing plate 102 to provide clamping force; a stator serving as a fixed part of a cycloidal rotor engine (or elliptical rotor engine) to fix the radial sealing device at its internal apex; an external pressurizing device for providing liquid pressurization and controlling liquid flow and pressure; and an external pipeline for connecting the external pressurizing device to the central channel 104 of the radial sealing plate 102.

[0140] The process of achieving non-contact sealing through external piping and external pressurization involves pressing liquid into the central channel 104 of the sealing disc 102 via the external piping. The liquid then enters the tree-shaped microgroove 103 through the oil hole 105, forming a uniform liquid film. The initial liquid film is formed by external pressurization, and the rotation of the rotor generates a dynamic pressure effect, maintaining the stability of the liquid film. Data recording and analysis verified the formation and stability of the liquid film, ensuring the effectiveness of the sealing disc's design and manufacturing process, and achieving a highly efficient non-contact sealing effect.

[0141] Furthermore, the tree-shaped microgroove radial sealing device needs to be installed. First, position the assembled sealing device (including the radial sealing plate 102 and compression spring 101) at the inner apex of the engine stator; securely fix the sealing device to the stator using bolts or fasteners, ensuring that the sealing device does not loosen during engine operation. Next, connect the external piping. The external piping connects to the external pressurization device and the central groove 104 of the radial sealing plate 102; ensure the external piping connection is secure and leak-free. After installation, inspect to ensure all components are securely connected and without loosening.

[0142] Furthermore, the external pressurization system was activated to conduct preliminary tests and observe the liquid entering the central channel 104 and flowing into the tree-shaped micro-channel 103 through the oil hole 105.

[0143] In one specific embodiment, an external pressurization system is activated, pressurizing liquid into the central channel 104 of the radial sealing plate 102 via an external pipeline. The liquid enters the central channel 104 through the pipeline and is stored in the central channel 104 on the back side of the radial sealing plate 102. The liquid flows into the tree-shaped microgroove 103 through the oil hole 105 between the central channel 104 and the tree-shaped microgroove 103. Furthermore, the pressure provided by the external pressurization system pushes the liquid into the tree-shaped microgroove 103, forming an initial liquid film. As the liquid continues to flow in, the liquid film is evenly distributed within the tree-shaped microgroove 103, forming a stable liquid film and achieving a non-contact sealing effect.

[0144]

[0145] Analysis of liquid film formation: First, in the initial stage, the external pressurization system provides a pressure of 0.5 MPa and a liquid flow rate of 2.0 L / min; the liquid begins to enter the central channel 104 and enters the tree-shaped microgroove 103 through small holes. Second, during the liquid film formation process, as the liquid enters the tree-shaped microgroove 103, the pressure gradually decreases to 0.48 MPa, while the flow rate remains at 2.0 L / min; subsequently, the liquid film gradually forms, covering the tree-shaped microgroove 103. Third, in the stable state of the liquid film, after the liquid film gradually stabilizes, the pressure drops to 0.45 MPa Pa, and the flow rate is 1.6 L / min; the test observed that the liquid film uniformly covers the tree-shaped microgroove 103, ensuring that the tiny gap between the sealing plate 102 and the rotor surface is filled by the liquid film, achieving a non-contact sealing effect.

[0146] Experimental results: First, from the pressure change analysis, the initial high pressure gradually decreased, indicating that the liquid gradually entered the central channel 104 and the tree-shaped micro-groove 103, forming a liquid film; the pressure in the steady state decreased slightly, indicating that the liquid flow tended to stabilize after the liquid film was formed. Second, from the flow rate change analysis, the initial flow rate was relatively high, indicating that the liquid entered the central channel 104 and the tree-shaped micro-groove 103 at a relatively fast speed; the flow rate in the steady state decreased slightly, indicating that the liquid flow was stable and the liquid film coverage was uniform after the liquid film was formed. Third, from the liquid film observation, the visual inspection system showed that the liquid film uniformly covered the tree-shaped micro-groove 103, ensuring that the tiny gaps between the radial sealing plate 102 and the rotor surface were filled by the liquid film, achieving a non-contact sealing effect. With the external pressurization system, the liquid can smoothly enter the tree-shaped micro-groove 103 and form a stable liquid film. The initial liquid film can uniformly cover the tiny gaps between the sealing end faces, achieving effective sealing. Fourth, in terms of liquid film adaptability, under different radial displacement amplitudes, the liquid film can adaptively adjust, fill tiny gaps, and maintain a stable sealing effect. Static and dynamic displacement tests show that the liquid film can adapt to the instantaneous radial displacement of the rotor. Even with large displacements, the liquid film can still fill tiny gaps and maintain a sealing effect. Analysis of experimental data demonstrates that solid-liquid contact can maintain a stable sealing effect under different displacement and speed conditions. Fifth, regarding leakage prevention, even with large rotor radial displacements (e.g., 200μm and 300μm), the liquid film remains stable, preventing leakage and proving its superiority in adapting to rotor radial displacement. Sixth, in terms of reducing wear, the presence of the liquid film avoids direct contact between the sealing plate and the rotor. The stable liquid layer formed between the sealing end faces effectively prevents gas leakage, reduces friction and wear, and extends the service life of the sealing device.

[0147] like Figure 3As shown in the schematic diagram of the interior of the radial sealing strip 102, the internal structure of the radial sealing strip 102 is shown, including the shape of the radial sealing strip 102, the central channel 104 of the radial sealing strip 102, the internal layered layout of the radial sealing strip 102 (with built-in tree-like microgrooves 103), and the surface texture of the radial sealing strip 102, which reflects that the radial sealing strip 102 takes into account sealing performance, structural strength and adaptability during the design and manufacturing process.

[0148] Furthermore, such as Figure 3 As shown, the radial sealing plate 102 is generally curved; the right end of the radial sealing plate 102 is slightly upturned, and the left end is smoothly transitioned; there is a tall rectangular block (rectangular elongated protrusion) in the center of the radial sealing plate 102, which runs through the entire width of the radial sealing plate 102, and there is an elongated opening at the top of the rectangular block for mounting or fixing; the interior of the radial sealing plate 102 shows multiple parallel layered structures, with intervals between each layered structure, presenting a mesh layout, involving channels for fluid or gas, to enhance the sealing effect.

[0149] Furthermore, such as Figure 3 As shown, the radial sealing sheet 102 has fine lines on its surface. These lines are arranged in parallel and distributed along the curvature of the sealing sheet. The dotted lines in the figure indicate that the radial sealing sheet 102 has a built-in layered layout during the processing, forming a tree-like microgroove 103, which can enhance friction and sealing effect.

[0150] Furthermore, such as Figure 3 As shown, from a side view perspective, the radial sealing plate 102 has a curved arc, which can adapt to the mounting surface or sealing surface of the cycloidal rotor engine (or elliptical rotor engine), facilitating a close fit of the radial sealing plate 102 on the mounting surface and maintaining good sealing performance. The top of the rectangular block (rectangular elongated groove) is higher than the rest of the radial sealing plate 102, forming a significant height difference with the body of the radial sealing plate 102. This height difference between the rectangular block (rectangular elongated groove) and the radial sealing plate 102 provides a fixing or support point, ensuring that the radial sealing plate 102 is firmly positioned during installation, while also helping to enhance the sealing effect, enabling the radial sealing plate 102 to better resist external pressure or stress.

[0151] Radial sealing sheet 102 and related components

[0152] As mentioned above, the radial sealing sheet 102 has an arc-shaped flat plate structure with slender tree-shaped microgrooves 103 on the surface and a central channel 104 on the back. The radial sealing sheet 102 is made of high-strength material and has the characteristics of high temperature resistance and wear resistance.

[0153] Specifically, the central channel 104 is integrally formed on the back of the radial sealing sheet 102, and is a longitudinally elongated groove located in the center of the radial sealing sheet 102. The central channel 104 is a groove of moderate depth and width, used to store liquid. The tree-shaped microgroove 103 is integrally formed on the back of the sealing sheet in a tree-like shape, directly formed on the surface of the radial sealing sheet 102, covering the entire surface of the radial sealing sheet 102, and is evenly distributed on the surface of the radial sealing sheet 102. It is a structure that can guide the flow of liquid and form a liquid film. The oil hole 105 is not clearly shown in Figure 3, but the oil hole 105 should be located at the bottom of the central channel 104, penetrating the thickness of the radial sealing sheet 102, and connecting the central channel 104 and the tree-shaped microgroove 103.

[0154] Furthermore, such as Figure 3 As shown in the side view, the connection methods of the radial sealing plate 102 and its various components are illustrated: the radial sealing plate 102 is connected to the central channel 104 by an integrated manufacturing process through mold forming; the radial sealing plate 102 is connected to the tree-shaped microgroove 103 by an integrated molding process through precision machining or mold forming technology; and the central channel 104 is connected to the oil hole 105 by a through-hole structure formed through drilling or mold forming processes.

[0155] Furthermore, such as Figure 3 As shown in the side view, the connection relationship between the radial sealing plate 102 and its various components is illustrated: the radial sealing plate 102 is connected to the central channel 104 by the central channel 104 being integrally formed on the back of the radial sealing plate 102, ensuring the integrity and stability of the structure; the radial sealing plate 102 is connected to the tree-shaped microgroove 103 by the tree-shaped microgroove 103 being directly formed on the surface of the radial sealing plate 102; the central channel 104 is connected to the oil hole 105 by the oil hole 105 penetrating the radial sealing plate 102, connecting the central channel 104 to the tree-shaped microgroove 103.

[0156] As described above, the radial sealing plate 102 and its related components function as follows: the radial sealing plate 102, as the main sealing element, covers the surface that needs to be sealed, providing structural support and sealing function; the central channel 104 is used to store liquid and distribute the liquid evenly into the tree-shaped microgroove 103 through the oil hole 105; the tree-shaped microgroove 103 is used to guide the liquid flow, forming a uniform liquid film, providing lubrication and sealing effects; the oil hole 105 is used to connect the central channel 104 and the tree-shaped microgroove 103 to achieve uniform distribution and flow of liquid.

[0157] As mentioned above, in terms of assembly (installation) principle, the non-contact sealing device of the radial tree-shaped microgroove described in this invention has a radial sealing plate 102 fixed to the surface to be sealed by bolts or clips; a central channel 104 integrally formed on the back of the radial sealing plate 102, connected to the tree-shaped microgroove 103 through an oil hole 105; the tree-shaped microgroove 103 is directly formed on the surface of the radial sealing plate 102, connecting the oil hole 105 and the central channel 104 to ensure liquid flow; the oil hole 105 is integrally formed on the surface of the radial sealing plate 102, penetrating the thickness of the radial sealing plate 102, ensuring that liquid flows from the central channel 104 into the tree-shaped microgroove 103 to form a liquid film.

[0158] The radial sealing sheet 102 has tree-shaped microgrooves 103 on its surface.

[0159] The tree-like microgroove 103 is shaped like a tree branch with multiple branches, similar to the forked structure of a tree branch, spreading outward from the center. It can guide the flow of liquid and form a liquid film. Each branch extends outward from the center, ensuring that the path of liquid flow covers the entire radial sealing sheet 102, and that the liquid can be evenly distributed on the entire surface of the radial sealing sheet 102, increasing the contact area with the sealed surface, thereby improving the sealing surface area of ​​the radial sealing sheet 102.

[0160] The tree-shaped microgroove 103 functions to guide liquid flow and provide lubrication and sealing effects. Specifically, the tree-shaped microgroove 103 is designed in a tree-like shape, which can effectively guide the liquid flow on the surface of the radial sealing plate 102. When the liquid flows in the tree-shaped microgroove 103, it forms a uniform liquid film that covers the surface of the radial sealing plate 102. In turn, the liquid film reduces the direct contact between the radial sealing plate 102 and the sealed surface, provides lubrication, and reduces friction and wear. At the same time, the liquid film prevents gas or liquid leakage, providing an effective sealing effect.

[0161] Furthermore, the connection between the tree-shaped microgroove 103 and the radial sealing plate 102 is as follows: when designing the radial sealing plate 102, the shape and position of the tree-shaped microgroove 103 are precisely designed on the surface of the radial sealing plate 102; through injection molding, die casting, or other molding processes, the tree-shaped microgroove 103 and the radial sealing plate 102 are molded together to ensure a tight fit and integrity between the two; if necessary, precision machining techniques (such as CNC machining) are used to ensure the accuracy of the size and shape of the tree-shaped microgroove 103. Ultimately, the fine groove structure designed on the tree-shaped microgroove 103 prevents fluid or gas leakage and improves the sealing effect.

[0162] Furthermore, the connection between the tree-shaped microgroove 103 and the central channel 104 is achieved through a liquid flow connection via an oil hole 105, while there is no direct physical connection between the tree-shaped microgroove 103 and the central channel 104. Specifically, a hole is drilled at the bottom of the central channel 104 to ensure the precise positioning of the oil hole 105, penetrating the radial sealing plate 102; through the oil hole 105, liquid flows from the central channel 104 into the tree-shaped microgroove 103.

[0163] Furthermore, the connection between the tree-shaped microgroove 103 and the oil hole 105 is such that the oil hole 105 penetrates the thickness of the radial sealing sheet 102, directly connecting the central channel 104 to the tree-shaped microgroove 103. Specifically, during the manufacturing of the radial sealing sheet 102, the oil hole 105 is formed on the radial sealing sheet 102 through mold forming or precision machining technology; the oil hole 105 serves as a channel for liquid flow, ensuring that liquid flows from the central channel 104 into the tree-shaped microgroove 103.

[0164] Furthermore, the connection relationship of the various components of the tree-shaped microgroove 103 and its radial sealing plate 102 is as follows: the tree-shaped microgroove 103 is connected to the central channel 104 through an oil hole 105; the oil hole 105 ensures that liquid flows from the central channel 104 into the tree-shaped microgroove 103, forming a uniform liquid film. Specifically, the connection relationship between the tree-shaped microgroove 103 and the radial sealing plate 102 is that the tree-shaped microgroove 103 is directly engraved on the surface of the radial sealing plate 102; these tree-shaped microgrooves 103 exhibit a regular distribution relative to the radial sealing plate 102. Specifically, the connection relationship between the tree-shaped microgroove 103 and the central channel 104 is indirect; the tree-shaped microgroove 103 is indirectly connected to the central channel 104 through an oil hole 105; the oil hole 105 acts as a connecting channel, allowing liquid to flow from the central channel 104 into the tree-shaped microgroove 103. Specifically, the tree-shaped microgroove 103 is directly connected to the central channel 104. The oil hole 105 directly penetrates the radial sealing plate 102, connecting the central channel 104 to the tree-shaped microgroove 103 to ensure smooth liquid flow.

[0165] Furthermore, the working principle of the tree-shaped microgroove 103 in the radial sealing plate 102 is to guide the liquid flow and form a uniform liquid film on the surface of the sealing plate, thereby providing lubrication and sealing effects. Specifically, in terms of liquid flow and distribution, the liquid flows into the tree-shaped microgroove 103 from the central channel 104 through the oil hole 105; due to the multi-branch structure of the tree-shaped microgroove 103, the liquid can be evenly distributed on the surface of the sealing plate, forming a continuous liquid film. Specifically, in terms of liquid film formation, when the liquid flows in the tree-shaped microgroove 103, the liquid flows into the tree-shaped microgroove 103 through the oil hole 105, filling each branch of the tree-shaped microgroove 103; when the liquid flows in the tree-shaped microgroove 103, it forms and maintains a liquid film, reducing the direct contact between the sealing plate and the sealed surface, and providing lubrication and sealing effects. Specifically, from the perspective of dynamic pressure effect, when the cycloidal rotor engine (or elliptical rotor engine) starts running, the relative motion between the rotor surface and the radial sealing plate generates a dynamic pressure effect; the flow of liquid in the tree-like microgroove 103 generates a dynamic pressure effect, which promotes the liquid to flow more effectively in the tree-like microgroove 103, forming and maintaining a liquid film, further enhancing the stability of the liquid film and the sealing effect.

[0166] Central groove 104 on the back of the radial sealing sheet 102 surface

[0167] The central channel 104 is presented as a long, raised structure, with a regular cuboid shape. The top of the central channel 104 has a long, narrow slot for installing other fixing components. The sides and bottom of the rectangular block are tightly connected to the radial sealing plate 102, providing necessary support and fixation. The length of the central channel 104 is the same as the width of the radial sealing plate 102, ensuring that the central channel 104 can provide support throughout the width of the radial sealing plate 102.

[0168] The central channel 104 is located in the center of the radial sealing plate 102 and extends through the entire width of the radial sealing plate 102; the tree-shaped microgrooves are distributed around the rectangular block, and the branch structure of the tree-shaped microgrooves extends outward from both sides of the rectangular block; the central channel 104 and the radial sealing plate 102 form a significant height difference, which helps to provide structural support and positioning functions.

[0169] The central channel 104 functions to provide structural support and positioning, ensuring the sealing plate is securely fixed in the proper position during installation; and to provide additional mechanical strength, enabling the sealing plate to withstand mechanical stresses during operation. Specifically, the radial sealing plate 102 is subjected to various mechanical stresses and external pressures during operation, and the central channel 104, through its robust structure, effectively disperses and bears these stresses, ensuring the stability of the radial sealing plate 102. Specifically, during installation, the central channel 104 can serve as a reference point or fixing point, ensuring that the radial sealing plate 102 can be accurately installed in the designated position on the equipment. Specifically, the radial sealing plate 102 needs to effectively prevent fluid or gas leakage during operation, and the structural design of the central channel 104 increases the contact area with the sealing surface and makes the fluid path longer, increasing the difficulty of leakage and effectively preventing fluid or gas from leaking from the joint (gap). Specifically, the central channel 104 provides a secure fixing point for the radial sealing plate 102, which is usually fixed to the equipment by bolts, rivets or welding, ensuring that the radial sealing plate 102 will not loosen or fall off due to vibration or mechanical stress during the operation of the cycloidal rotor engine (or elliptical rotor engine).

[0170] Furthermore, the connection between the central ditch 104 and the radial sealing sheet 102 is integrally formed.

[0171] Furthermore, the connection relationship between the central channel 104, the radial sealing plate 102, and the various components is as follows: the radial sealing plate 102 serves as the overall basic structure, including the central channel 104, the tree-shaped microgrooves 103, and the oil holes 105; the central channel 104 is located at the top center of the radial sealing plate 102, providing support and positioning for the entire radial sealing plate 102, and the tree-shaped microgrooves 103 are distributed around it; the tree-shaped microgrooves 103 are distributed around the central channel 104, extending to both sides of the radial sealing plate 102, increasing the contact area and sealing effect of the radial sealing plate 102;

[0172] Oil holes 105 are distributed in the middle of the central channel 104 to serve as flow channels, guide the flow of fluid or gas, and enhance the sealing effect.

[0173] Specifically, the connection between the central channel 104 and the tree-shaped microgroove 103 is that the tree-shaped microgroove 103 is distributed around the central channel 104, and the branch structure of the tree-shaped microgroove 103 extends outward from both sides of the central channel 104. Since the tree-shaped microgroove 103 is integrally formed on the surface of the radial sealing sheet 102 and is closely adjacent to the central channel 104, the tree-shaped microgroove 103 increases the contact area of ​​the radial sealing sheet 102 and enhances the sealing performance through a complex fluid path to prevent leakage.

[0174] Specifically, the connection between the central channel 104 and the oil hole 105 is that the oil hole 105 is distributed in the middle of the central channel 104 for flow passage; the small hole is formed on the central channel 104 and the radial sealing plate 102 by machining or molding, serving as a flow passage to guide fluid or gas and further enhance the sealing effect.

[0175] Furthermore, the central channel 104 in the radial sealing plate 102 works by providing structural support and positioning functions, guiding fluid flow, and enhancing the sealing effect. Specifically, in terms of fluid guidance, the central channel 104 can guide the flow of fluid or gas, avoiding pressure buildup; furthermore, through structures such as channels, it guides and controls the flow path of the fluid, reducing the impact of fluid or gas on the sealing plate, and further improving the sealing performance. Specifically, in terms of enhancing the sealing effect, the presence of the central channel 104 increases the complexity of the contact surface between the sealing plate and the equipment, extending the path of fluid or gas leakage, effectively reducing leakage, and enhancing the sealing performance. Specifically, in terms of structural support, the central channel 104 provides mechanical strength through its robust structure, dispersing and bearing the mechanical stress generated during equipment operation. Specifically, in terms of positioning structure, the rectangular block serves as the central positioning structure of the radial sealing plate 102, allowing the radial sealing plate 102 to be precisely aligned with the designated position on the equipment during installation; especially during installation, the protruding part of the central channel 104 and its pre-set fixing holes or grooves ensure that the radial sealing plate 102 can be accurately and firmly fixed to the equipment. Specifically, in terms of fixed installation, the central ditch 104 is fixed to the sealing plate body and equipment by bolts, rivets or welding to form a firm mechanical connection, ensuring that the radial sealing plate 102 will not loosen or fall off during equipment operation.

[0176] like Figure 4 The diagram shows a planar structure of the tree-shaped microgroove 103, illustrating its detailed structure and connections. The tree-shaped microgroove 103 is connected to the central channel 104 via oil holes 105, ensuring that liquid flows from the central channel 104 into the tree-shaped microgroove 103, forming a uniform liquid film that provides lubrication and sealing. The tree-like design of the microgroove 103 ensures that the liquid is evenly distributed on the surface of the sealing sheet, providing stable sealing performance and lubrication.

[0177] The radial sealing sheet 102 has tree-shaped microgrooves 103 on its surface.

[0178] like Figure 4As shown in the figure, the planar structure of the tree-shaped microgroove 103 is illustrated. Each tree-shaped microgroove 103 is formed by combining several V-shaped and T-shaped elements to create a head shape (i.e., tree-like) in a unified direction. Each tree-like shape has a circular hole in its center, thus forming the tree-shaped microgroove 103. Several tree-shaped microgrooves 103 form a branching structure arranged integrally on the plane of the radial sealing sheet. The tree-shaped microgrooves 103... Figure 4 The components are arranged horizontally, with each row having a tree-shaped head. The heads of adjacent rows are slightly offset to create an interlaced effect. Each tree-shaped component has a circular hole in the center, which is aligned vertically to form a regular column. The tail of each tree-shaped microgroove 103 is connected to the head of the tree-shaped microgroove 103 to form a continuous structure. The position of the circular hole is fixed to maintain the stability of the head of each tree-shaped microgroove 103.

[0179] Specifically, the tree-shaped microgroove has a depth of 103. Specifically, the optimized groove depth of 5–7 μm allows for the formation of a stable liquid film after the liquid enters the groove. The shallower groove depth ensures that the liquid quickly fills the tree-like microgroove 103, forming the initial liquid film. Within the groove depth range of 5–7 μm, the tree-like microgroove 103 maintains the stability of the liquid film through hydrodynamic pressure effects, preventing film rupture or localized excessive thickness or thinning. The 5–7 μm depth design of the tree-like microgroove 103 enhances the hydrodynamic pressure effect, generating stable dynamic pressure as the rotor rotates, thereby maintaining a uniform distribution of the liquid film and ensuring a moderate increase in pressure as the liquid flows through the tree-like microgroove, thus enhancing the sealing effect.

[0180] Furthermore, regarding liquid distribution and flow control, the tank depth and flow rate need to be matched. A tank depth of 5–7 μm ensures that the liquid is rapidly and evenly distributed after entering the tree-like micro-groove, forming a uniform liquid film and avoiding localized areas of excessive or insufficient liquid. A tank depth of 5–7 μm also helps control the liquid flow rate, preventing the liquid from flowing too fast or too slow within the tree-like micro-groove and ensuring the stability of the liquid film. From a pressure balance perspective, a tank depth of 5–7 μm ensures uniform pressure distribution within the tree-like micro-groove, preventing localized excessively high or low pressure and enhancing the sealing effect.

[0181] Furthermore, in order to mimic the hydrodynamic characteristics of tree branch distribution in nature, the tree-shaped microgroove 103 is built into the curved surface of the radial sealing sheet 102. The tree-shaped microgroove 103 has different depths and layers in its microstructure, which helps to achieve uniform distribution and conduction of fluid, so as to achieve better sealing and fluid control effects.

[0182] Furthermore, the varying depths of the tree-shaped microgrooves 103 create different liquid flow channels. Deeper microgrooves 103 are used for the main liquid flow, while shallower ones refine the liquid distribution. Deeper microgrooves 103 can hold more liquid, providing the main fluid channel; shallower microgrooves 103 refine the liquid distribution, ensuring uniform coverage of the entire radial sealing sheet 102 surface. Specifically, deeper microgrooves 103 can hold more liquid, providing the main liquid flow path. Due to their greater depth, deeper microgrooves 103 can guide most of the liquid to flow rapidly, forming a stable mainstream, ensuring the continuity and stability of the liquid flow, reducing the possibility of liquid loss during flow, and helping to quickly cover the main area of ​​the sealing surface, providing sufficient liquid volume to form a basic liquid film. Specifically, the shallower tree-shaped microgrooves 103 can hold less liquid, which is used to refine the liquid distribution; the shallower depth reduces the liquid flow rate, thereby uniformly covering the surface of the radial sealing sheet 102, ensuring that the liquid can be evenly distributed over a larger surface area, avoiding situations where there is too much or too little liquid in certain areas; the shallower tree-shaped microgrooves 103 can be evenly distributed over a larger surface area, forming a uniform liquid film, ensuring that the entire surface of the radial sealing sheet 102 is adequately covered by liquid, reducing friction and wear.

[0183] Furthermore, in terms of hierarchical structure, the tree-like microgrooves 103 resemble the branches of a tree, expanding layer by layer from the center outwards; each layer of tree-like microgrooves 103 is a fluid distribution area. The deeper tree-like microgrooves 103 near the center primarily guide liquid flow, forming the main liquid flow channels; the shallower sections further from the center are used to evenly distribute and refine the liquid distribution, ensuring uniform liquid coverage across the entire sealing surface. Specifically, the deeper tree-like microgrooves 103 near the center have a larger volume, capable of holding more liquid, ensuring the continuity and stability of liquid flow; and the central location can quickly guide liquid flow, forming the main liquid flow channels. Conversely, the shallower tree-like microgrooves 103 further from the center refine the liquid distribution, ensuring uniform liquid coverage across the entire radial sealing plate 102 surface; the shallower sections further from the center reduce the liquid flow velocity, increasing flow resistance, thereby evenly distributing the liquid over a larger surface area.

[0184] Furthermore, from a fluid dynamics perspective, since the deeper tree-shaped microchannel 103 has a greater depth and volume, it can hold more liquid. Under the same fluid pressure, the deeper channel can conduct a larger amount of liquid, thereby increasing the liquid flow rate. According to Bernoulli's principle, under a constant pressure difference, a wider flow channel will lead to an increase in liquid velocity. Therefore, the deeper channel ensures the width of the liquid flow channel, provides less flow resistance, and enables the liquid to flow at a higher speed.

[0185] Furthermore, from the perspective of liquid formation, the deeper tree-shaped microchannels 103 serve as the main liquid flow channels, guiding the main flow direction of the liquid. Within the deeper tree-shaped microchannels 103, the liquid flow path resembles the trunk of a tree branch, providing a stable liquid flow channel and reducing flow resistance. From the perspective of the flow path, within the deeper tree-shaped microchannels 103, the liquid flows under force, its flow path guided by the deep channels, flowing along the main flow path and expanding from the central region to the outer region. The design of the flow path (tree-shaped microchannels 103) directly affects the liquid's velocity and flow rate.

[0186] Furthermore, from a fluid dynamics perspective, the shallower, tree-like microgrooves 103, with their smaller depth and width, act as narrow flow channels, refining the liquid distribution and ensuring uniform liquid coverage across the entire radial sealing plate 102 surface. According to the continuity equation in fluid mechanics, the fluid velocity decreases as it flows through a narrow channel. The narrow design of the shallower, tree-like microgrooves 103 increases the frictional resistance between the liquid and the channel walls. According to the Darcy-Wiesbach equation, flow resistance is related to pipe length, liquid viscosity, and flow velocity; therefore, the narrower channel of the shallower, tree-like microgrooves 103 increases friction, thus increasing flow resistance. Furthermore, the smaller diameter and higher friction factor of the shallower, tree-like microgrooves 103 further increase flow resistance, resulting in smoother liquid flow.

[0187] Furthermore, regarding the uniform distribution of liquid, the shallower, tree-like microgrooves 103, similar to the branching ends of tree branches, reduce the liquid velocity and increase flow resistance, thereby promoting uniform liquid distribution across the entire radial sealing plate 102 surface. Especially when fluid flows in narrow, shallow grooves, the reduced velocity and increased resistance result in smoother flow, contributing to the formation of a uniform liquid film across the entire surface. From the perspective of flow path, according to Bernoulli's principle, the lower liquid velocity and reduced pressure loss in branched paths help maintain uniform liquid flow. According to the Darcy-Wiesbach equation, increased flow resistance leads to a decrease in velocity, ensuring uniform liquid distribution along each branch path. Therefore, the branching structure of the shallow grooves guides the liquid along multiple paths, dispersing flow resistance and preventing excessive liquid accumulation in any one area. Consequently, the liquid flow in each branch is relatively independent, dispersing the pressure and velocity of the liquid flow and ensuring uniform flow.

[0188]

[0189] Verification of the flow distribution of the tree-shaped microgroove 103: The tree-shaped microgroove 103 has significant advantages. Specifically, through its shallow and deep groove design, the tree-shaped microgroove 103 can adapt to laminar, turbulent, and transitional flow regimes, ensuring sealing performance under different operating conditions. Specifically, the tree-shaped microgroove 103 provides effective sealing, forming a stable liquid film in laminar flow, achieving rapid and uniform distribution in turbulent flow, and combining stability and uniformity in transitional flow. Specifically, the tree-shaped microgroove 103 can extend service life, reduce wear and energy consumption in laminar flow, improve heat and mass transfer efficiency in turbulent flow, and optimize overall performance in transitional flow.

[0190] Verification conclusions of the tree-shaped microgroove 103 and radial sealing effect: The design of the tree-shaped microgroove 103 allows the liquid to exhibit different flow states in different areas by varying the groove depth and flow path length.

[0191] like Figure 5 The diagram shows the installation of the radial sealing device of the present invention in a cycloidal rotor engine. The compression spring 101 provides the initial clamping force, ensuring close contact between the sealing plate 102 and the rotor surface. After startup, the liquid film and the action of the compression spring 101 ensure the stability of the sealing effect. The liquid film formed by external pressure, the clamping force of the spring, and the hydrodynamic effect work together to maintain the sealing contact between the sealing plate and the rotor, providing excellent sealing performance.

[0192] Specifically, such as Figure 5 The diagram shows the installation of the radial sealing device of the present invention in a cycloidal rotor engine. The components and their functions are as follows: The stator is fixed to the top of the radial sealing device, supporting the compression spring 101 and providing structural support and stability. The compression spring 101 is installed between the stator and the radial sealing plate 102, providing clamping force; in the unpressurized state, the compression spring 101 provides preload force, causing the radial sealing plate 102 to adhere to the rotor surface. The radial sealing plate 102 is installed on the rotor surface to seal the gas chambers; as the main sealing element, the radial sealing plate 102 prevents gas leakage. The rotor, as a rotating component, is located below the radial sealing plate 102, and the sealing effect is generated through the rotational movement of the rotor. Gas chambers a and b are located on both sides of the rotor, serving as a sealed environment to prevent gas leakage.

[0193] Specifically, such as Figure 5As shown in the schematic diagram, the radial sealing device of the present invention is installed in a cycloidal rotor engine. The connection method of each component is as follows: the stator is fixed to the top of the radial sealing device by fixing bolts or welding, supporting the compression spring 101; one end of the compression spring 101 is connected to the stator, and the other end is connected to the radial sealing plate 102, which is fixed by mechanical fitting or snap-fit; the radial sealing plate 102 is fixed to the rotor surface by slots, bolts or welding; the rotor is directly connected to the main body of the cycloidal rotor engine (or elliptical rotor engine) through bearings or other rotating connecting parts, located below the radial sealing plate 102, and can rotate freely; air chambers a and b are located on both sides of the rotor, forming a sealed environment through the sealing cooperation between the rotor and the radial sealing plate 102.

[0194] Furthermore, such as Figure 5 The diagram shows the installation of the radial sealing device of the present invention in a cycloidal rotor engine. The transmission mechanism of each component includes the transmission relationship between the stator and the compression spring 101, the transmission relationship between the compression spring 101 and the radial sealing plate 102, the transmission relationship between the radial sealing plate 102 and the rotor, and the transmission relationship between the rotor and air chambers a and b. Specifically, the transmission relationship between the stator and the compression spring 101 is that the stator provides structural support and fixes one end of the compression spring 101 by bolts or welding; the stator transmits its stability to the compression spring 101, so that the spring provides preload in the unpressurized state. Specifically, the transmission relationship between the compression spring 101 and the radial sealing plate 102 is that the compression spring 101 connects to the radial sealing plate 102 by mechanical fitting or snap-fit ​​and provides clamping force, so that the radial sealing plate 102 is tightly attached to the rotor surface; in the unpressurized state, the preload of the compression spring 101 ensures that the radial sealing plate 102 is in close contact with the rotor surface, preventing gas leakage. Specifically, the transmission relationship between the radial sealing plate 102 and the rotor is that the radial sealing plate 102 is fixed to the rotor surface by means of a slot, bolt, or welding, ensuring that the radial sealing plate 102 remains stable during rotor rotation; the rotational motion of the rotor is transmitted to the sealing surface through the radial sealing plate 102, forming a dynamic pressure effect and enhancing the sealing effect. Specifically, the transmission relationship between the rotor and air chambers a and b is that the rotational motion of the rotor and the sealing effect of the radial sealing plate 102 ensure that there is no gas leakage between air chambers a and b; furthermore, the rotation of the rotor transmits the working process (intake, compression, combustion, exhaust) to air chambers a and b, ensuring the normal operation of the cycloidal rotor engine (similar to an elliptical rotor engine).

[0195] air chamber a and air chamber b

[0196] In a cycloidal rotor engine (or elliptical rotor engine), chamber a and chamber b represent two distinct chambers within the engine, referring to two different working spaces or combustion chambers. Chamber a and chamber b are separated from the stator by seals (such as radial sealing strip 102) to prevent gas leakage.

[0197] Specifically, in a cycloidal rotor engine (or elliptical rotor engine), chamber a and chamber b are two independent working chambers, functioning to complete the cyclic process of intake, compression, combustion, and exhaust. Chamber a is one working chamber in the cycloidal rotor engine (or elliptical rotor engine) cycle. Chamber a is located on one side of the rotor, forming a sealed working space with the stator interior. At different operating stages, chamber a is in any of the following states: intake, compression, combustion, or exhaust. Chamber b is another working chamber, independent of chamber a. Chamber b is located on the other side of the rotor, forming another sealed working space with the stator interior; it performs a working cycle that is staggered from that of chamber a.

[0198] Based on the working principle of a cycloidal rotor engine (or elliptical rotor engine), within one cycle, chamber a undergoes the processes of intake, compression, combustion, and exhaust. These processes occur sequentially as the rotor rotates. Similar to chamber a, chamber b, located on the other side of the rotor, undergoes the same cyclic process, but at slightly different times to ensure smooth operation of the cycloidal rotor engine. Specifically, during the intake phase, chambers a and b draw in air and fuel mixtures respectively as the rotor rotates; during the compression phase, the rotor continues to rotate, and the volumes of chambers a and b gradually decrease, compressing the gas mixture; during the combustion phase, when the gas mixture is compressed to a certain extent, the spark plug ignites, combustion occurs, and energy is released to drive the rotor's rotation; during the exhaust phase, the combusted exhaust gases are expelled from the chambers, completing one cycle.

[0199] Example 4: The entire process of the tree-shaped microgroove radial sealing device of the present invention from the unpressurized state before startup to the operating state.

[0200] In one specific embodiment, during the preparation stage before starting the cycloidal rotor engine (or elliptical rotor engine), the stator is fixed on top of the radial sealing device to ensure the structural support and stability of the device; the compression spring 101 is installed between the stator and the radial sealing plate 102 to provide preload force, so that the radial sealing plate 102 is tightly attached to the rotor surface, forming a preliminary sealing effect.

[0201] Furthermore, the external pressurization system is activated, and pressure is applied to the sealing end face via a pressure pump, causing the lubricant to flow into the tree-shaped microgrooves 103 on the sealing plate 102. The lubricant flows into the tree-shaped microgrooves 103 through the oil holes 105, and is evenly distributed on the surface of the radial sealing plate 102, forming a continuous liquid film, further enhancing the sealing effect.

[0202] During the startup phase of the cycloidal rotor engine (or elliptical rotor engine), after pressurization to form a liquid film, the radial sealing device is activated and the rotor begins to rotate; the preload provided by the compression spring 101 ensures close contact between the radial sealing plate 102 and the rotor surface, preventing initial leakage.

[0203] During the operation of the cycloidal rotor engine (or elliptical rotor engine), the rotational motion of the rotor generates a dynamic pressure effect, which, together with the clamping force of the compression spring 101, maintains the stability of the liquid film and the sealing effect. The compression spring 101 can adapt to the vibration and eccentric motion of the rotor, maintaining the sealing contact between the radial sealing plate 102 and the rotor. At this time, air chambers a and b are located on both sides of the rotor, forming a sealed environment through the sealing cooperation between the radial sealing plate 102 and the rotor, preventing gas leakage and ensuring the normal operation of the cycloidal rotor engine (or elliptical rotor engine).

[0204] (1) Normal startup and operation

[0205] In one specific embodiment, during the start-up phase of the cycloidal rotor engine (or elliptical rotor engine), after external pressure is applied to form a liquid film, the device starts up and the rotor begins to rotate; the radial sealing plate 102 is in close contact with the rotor surface through the preload of the compression spring 101, thus initially forming a seal.

[0206] During the operation of the cycloidal rotor engine (or elliptical rotor engine), the dynamic pressure effect and the clamping force of the compression spring 101 work together to maintain the stability of the liquid film and the sealing effect. Furthermore, the lubricant is evenly distributed on the surface of the radial sealing plate 102 through the tree-like microgrooves 103, ensuring the existence of a continuous liquid film; the compression spring 101 can adapt to the vibration and eccentric movement of the rotor, maintaining the sealing contact between the radial sealing plate 102 and the rotor.

[0207] (2) High temperature and high pressure environment

[0208] In one specific embodiment, under high temperature and high pressure conditions, the pressurization process before starting the cycloidal rotor engine (or elliptical rotor engine) is the same: lubricating fluid is injected into the tree-shaped microgroove through a pressure pump; then, after the liquid film is formed, the device is started and the rotor rotates.

[0209] During the operation of a cycloidal rotor engine (or elliptical rotor engine), under high temperature and high pressure conditions, the lubricant must ensure that it does not evaporate or decompose. The materials of the radial seal 102 and the compression spring 101 must ensure that their elasticity and sealing performance are not affected. The liquid film can effectively reduce friction and wear, and extend the service life of the sealing system.

[0210] (3) Frequent start-stop operation

[0211] In one specific embodiment, before each start-up and shutdown, the external pressurization system is activated to ensure that the lubricant flows into the tree-shaped microgroove 103 to form a liquid film; during the rotor start-up and shutdown process, the radial sealing plate 102 is always kept in contact with the rotor surface by the preload of the compression spring 101.

[0212] Under frequent start-stop conditions, the elasticity and durability of the compression spring 101 can adapt to frequent compression and release; the liquid film can be formed quickly during each start-stop process to ensure the sealing effect; the lubricant has good fluidity and stability to cope with frequent operational changes.

[0213] (4) Vibration and eccentric motion

[0214] In one specific embodiment, the pressurization process before startup is the same to ensure the formation of a liquid film; during rotor startup, the radial sealing plate 102 is in close contact with the rotor surface by the preload of the compression spring 101.

[0215] Under conditions of vibration and eccentric motion, the compression spring 101 can adapt to these dynamic changes and maintain contact between the sealing plate and the rotor. With the help of the tree-shaped microgrooves, the liquid film is evenly distributed and exists stably, ensuring the sealing effect; the entire sealing system can withstand a certain degree of vibration and eccentric motion, ensuring the normal operation of the equipment.

[0216] like Figure 6 The diagram illustrates the operation of the radial sealing device of the present invention under pre-start pressurization, demonstrating the formation of a liquid film through external pressurization before startup. The stator provides structural support, the compression spring 101 provides clamping force, and the radial sealing plate 102 adheres to the rotor surface to form an initial seal. External pressurization causes liquid to flow into the tree-like microgrooves 103, forming a uniform liquid film. During the startup process of the cycloidal rotor engine (or elliptical rotor engine), the rotational motion of the rotor generates a dynamic pressure effect, gradually replacing the static pressure effect of the external pressurization, maintaining the stability of the liquid film, and ensuring the sealing effect.

[0217] Furthermore, such as Figure 6The diagram shows the operation of the radial sealing device of the present invention before pressurization. The operation of each component is as follows: Before the cycloidal rotor engine (or elliptical rotor engine) starts, pressure is applied to the sealing end face through an external system, and liquid enters the tree-like microgroove 103 through the liquid path; the liquid is evenly distributed on the surface of the radial sealing plate 102 through the oil hole 105, forming a continuous liquid film. Specifically, before external pressurization, the compression spring 101 provides an initial preload, causing the radial sealing plate 102 to adhere to the rotor surface; the compression spring 101 can adapt to the vibration and eccentric movement of the rotor, maintaining the sealing contact between the radial sealing plate 102 and the rotor. Specifically, after the external pressurization forms a liquid film, the cycloidal rotor engine (or elliptical rotor engine) starts, and the rotor begins to rotate; during operation, the external pressure is gradually reduced, and the liquid film changes from hydrostatic pressure to hydrodynamic pressure for stabilization, ensuring the sealing effect.

[0218] Furthermore, regarding the transformation of the liquid film, the transformation of the liquid film in the radial sealing device undergoes two main stages: the initial formation stage (static pressure maintenance) and the operation stage (dynamic pressure maintenance). In the initial stage, a statically maintained liquid film is formed by external pressurization, ensuring close contact between the radial sealing plate 102 and the rotor surface. After the cycloidal rotor engine (quasi-elliptical rotor engine) starts, the rotation of the rotor generates a dynamic pressure effect, and the liquid film gradually changes from static pressure maintenance to dynamic pressure maintenance, ensuring the stability of the sealing effect.

[0219] Specifically, according to Bernoulli's equation, hydrostatic pressure, through externally applied pressure, causes liquid to flow into the tree-like microgroove 103, forming a liquid film. The pressure of the liquid film depends on the height of the liquid and the external pressure. According to the continuity equation, under hydrostatic pressure, the flow of liquid in the oil hole 105 and the tree-like microgroove 103 follows the continuity equation, that is, the inflow of liquid equals the outflow of liquid, maintaining a uniform distribution of the liquid film. Therefore, in the initial liquid film formation stage (hydrostatic pressure maintenance), pressure is applied by the external system, and the external pressure causes the liquid to be uniformly distributed on the surface of the radial sealing plate 102 through the oil hole 105. The stability of the liquid film is maintained by hydrostatic pressure, ensuring close contact between the radial sealing plate 102 and the rotor surface. The liquid film is mainly maintained by hydrostatic pressure, ensuring a good seal between the radial sealing plate 102 and the rotor surface. The hydrostatic pressure, through the pressure difference, keeps the liquid in the tree-like microgroove 103, forming a uniform liquid film and preventing gas leakage.

[0220] Specifically, according to Bernoulli's equation, as flow velocity increases, pressure decreases, and the dynamic pressure effect intensifies. The dynamic pressure effect generated by the rotor rotation causes the liquid to flow in the tree-like microgroove 103, forming a stable liquid film. According to fluid dynamics, during rotor rotation, the dynamic pressure effect of the liquid keeps the liquid film stable, preventing liquid backflow and ensuring a sealing effect. Therefore, in the operating phase (dynamic pressure maintenance) of the cycloidal rotor engine (elliptical rotor engine), the rotor begins to rotate, and the rotation of the rotor generates dynamic pressure, redistributing the liquid in the tree-like microgroove 103 to form a new pressure balance. The liquid film gradually changes from static pressure maintenance to dynamic pressure maintenance. As the external pressure gradually decreases, the dynamic pressure effect, through the rotor's rotational speed and fluid dynamic characteristics, maintains the uniformity and stability of the liquid film by the liquid dynamic pressure, providing a continuous and stable sealing effect.

[0221] Example 7: Formation and maintenance of a liquid film to prevent backflow of liquid from the orifice

[0222] In one specific embodiment, before the cycloidal rotor engine (or elliptical rotor engine) is started, pressure is applied to the sealing end face via an external pressurization system; liquid enters the tree-like microgroove 103 through the liquid path and oil hole 105, forming a uniform initial liquid film on the surface of the radial sealing plate 102. Furthermore, the static pressure of the external pressurization keeps the liquid within the tree-like microgroove 103, ensuring close contact between the sealing plate 102 and the rotor surface, forming a preliminary seal.

[0223] After ensuring the initial liquid film is formed, start the engine and the rotor begins to rotate. The rotation of the rotor generates a dynamic pressure effect, which further stabilizes the liquid film. As the cycloidal rotor engine (or elliptical rotor engine) starts and the rotor rotates, gradually reduce the external pressure to prevent the liquid from relying on external static pressure to maintain its position. During the process of reducing the external pressure, monitor the stability and pressure of the liquid film to prevent liquid from flowing back from the oil hole 105.

[0224] Furthermore, the dynamic pressure effect generated by the rotor rotation causes the liquid to form a stable liquid film in the tree-shaped microgroove 103; the dynamic pressure effect enhances the stability of the liquid film, ensuring that the liquid will not flow back from the oil hole 105. Adjusting the external pressure to a certain stable pressure balances the pressure of the liquid at the oil hole 105 with the liquid pressure in the tree-shaped microgroove 103, preventing liquid backflow.

[0225] (1) Specific measures to prevent liquid backflow

[0226] In one specific embodiment, the external pressurization first needs to be monitored and adjusted. During the startup process of the cycloidal rotor engine (or elliptical rotor engine), the liquid film pressure is monitored in real time by sensors to ensure that the external pressurization is gradually reduced to a stable pressure, preventing liquid backflow. Then, the pressure output of the external pressurization system is adjusted to maintain the liquid pressure at the oil hole 105 consistent with the pressure in the tree-like microgroove 103.

[0227] Next, the rotational dynamic pressure effect of the rotor is used to maintain the flow of liquid in the tree-shaped micro-groove 103 and prevent backflow of liquid in a static state. The dynamic pressure effect generates a pressure difference through the high-speed flow of liquid in the tree-shaped micro-groove 103, which makes the liquid flow continuously inward and prevents backflow.

[0228] (2) Verify that the radial sealing plate 102 of the cycloidal rotor engine (elliptical rotor engine) can effectively prevent liquid backflow from the small hole.

[0229] In one specific embodiment, to verify the effectiveness of preventing liquid backflow from oil hole 105, experimental preparation is first performed. Specifically, a cycloidal rotor engine (or elliptical rotor engine) test apparatus is prepared, including: a stator, rotor, compression spring 101, radial sealing plate 102, air chamber a, and air chamber b; an external pressurization system requires a controllable pressure source for applying and adjusting liquid pressure during the test; pressure sensors and flow sensors are prepared, the pressure sensor is used to monitor the liquid film pressure in real time, and the flow sensor is used to monitor the liquid flow; a data acquisition system is also required to record the data from the pressure and flow sensors. The liquid is a liquid suitable for cycloidal rotor engines (or elliptical rotor engines) (such as lubricating oil or specific working fluids, gasoline, etc.).

[0230] In this specific embodiment, initial preparations are first made by installing a cycloidal rotor engine (or elliptical rotor engine) test device to ensure that the stator, rotor, compression spring 101, radial seal 102, and air chambers a and b are correctly connected; an external pressurization system is connected to ensure that liquid pressure can be applied to and adjusted on the radial seal; and pressure and flow sensors are installed and connected to a data acquisition system.

[0231] In this specific embodiment, the phenomenon of initial liquid film formation (static pressure maintenance) is then monitored. Pressure is applied to the radial sealing sheet 102 through an external pressurization system, causing the liquid to enter the tree-shaped microgroove 103 through the oil hole 105 to form an initial liquid film. Then, the data acquisition system is activated to record the pressure and flow data during the initial liquid film formation process.

[0232] In this specific embodiment, the dynamic pressure maintenance is continuously monitored. After ensuring the initial liquid film is stable, the cycloidal rotor engine (similar to an elliptical rotor engine) is started to make the rotor begin to rotate; the pressure output of the external pressurization system is gradually reduced to simulate the situation where the external pressure gradually decreases during actual operation; then, the liquid film pressure and flow data are continuously monitored to ensure that the pressure gradually decreases to a stable pressure.

[0233] Throughout the entire specific embodiment, the dynamic pressure effect generated during rotor rotation is observed to ensure that the liquid film changes from static pressure maintenance to dynamic pressure maintenance; pressure and flow data during the dynamic pressure maintenance phase are recorded, with particular attention paid to the pressure change and liquid flow direction at oil hole 105.

[0234] Finally, backflow prevention verification was performed throughout the entire implementation process. Pressure and flow data recorded by the data acquisition system were analyzed to verify whether the liquid pressure at the orifice matched the pressure in the tree-like microchannel during the dynamic pressure maintenance phase. Flow sensor data was used to verify whether backflow occurred, ensuring the liquid flow direction remained continuously inward.

[0235]

[0236]

[0237] Experimental verification during the initial liquid film formation stage (static pressure maintenance): From the pressure data, the pressure P1 applied by the external pressurization system is 0.5MPa, the pressure P2 at oil hole 105 is 0.48MPa, and the pressure P3 in the tree-like microchannel 103 is 0.475MPa; From the flow data, the liquid flow rate F1 entering the tree-like microchannel 103 and the flow rate F2 at oil hole 105 are both 1.5L / min.

[0238] Test verification during the dynamic pressure maintenance phase: From the pressure data, as the external pressure gradually decreases, P1 gradually drops to 0 Pa, and P2 and P3 also decrease accordingly, but remain in equilibrium; From the flow data, F1 and F2 gradually decrease, but remain consistent, indicating that the liquid flow direction is continuously inward and there is no backflow phenomenon.

[0239] Conclusion on static pressure maintenance: Liquid enters the tree-shaped microgroove 103 through external pressure, forming a uniform liquid film. Static pressure maintains the stability of the liquid film, ensuring close contact between the sealing plate and the rotor surface.

[0240] Conclusion on dynamic pressure maintenance: The rotor rotation generates a dynamic pressure effect, which maintains the stability of the liquid film. The dynamic pressure effect is achieved by creating a pressure difference through the high-speed flow of liquid in the tree-like microchannel 103, causing the liquid to flow continuously inward and preventing backflow.

[0241] Final Conclusion: By comparing the pressure and flow data during the initial liquid film formation stage and the dynamic pressure maintenance stage, it can be verified that the radial sealing plate of the cycloidal rotor engine (or elliptical rotor engine) effectively prevents liquid backflow. The data shows that during the dynamic pressure maintenance stage, the liquid pressure at the oil hole 105 remains balanced with the pressure in the tree-like microgroove 103, and the flow data are consistent, ensuring that the liquid flow direction is continuously inward without backflow. This embodiment verifies that the design of the radial sealing plate 102 can provide a stable sealing effect during the operation of the cycloidal rotor engine (or elliptical rotor engine), preventing liquid backflow and improving sealing efficiency.

[0242] like Figure 7 The diagram illustrates the operation of the radial sealing device of this invention. It shows that the spring plate 101 provides the initial preload, causing the radial sealing plate 102 to adhere tightly to the rotor surface, forming a preliminary sealing effect. An external pressurization system injects lubricant into the tree-like microgrooves on the radial sealing plate 102 via a liquid path. As the rotor moves, the liquid moves along with it due to viscosity. When the liquid passes through the tree-like microgrooves 103, the cross-section of the microgrooves suddenly increases, causing a sharp drop in liquid velocity and an increase in pressure, forming a stable liquid film. This liquid film forms an effective sealing layer between the sealing plate and the rotor, preventing liquid or gas from leaking from chamber a to chamber b, achieving a highly efficient sealing effect. This design utilizes the principles of fluid mechanics, optimizing the liquid flow state and pressure distribution to ensure the stability and reliability of the sealing system during operation.

[0243] As mentioned above, such as Figure 6 The diagram shows the radial sealing device of the present invention in operation before pressurization. The positions of each component are as follows: The stator is located at the top of the radial sealing device, connecting and supporting the compression spring 101, providing structural support and stability. The compression spring 101 is placed vertically between the stator and the radial sealing plate 102, so that the radial sealing plate 102 is in contact with the rotor surface; the compression spring 101 provides preload in the unpressurized state. The radial sealing plate 102, as the main sealing element, is in contact with the rotor surface to prevent gas leakage. The rotor, as a rotating component, is located below the radial sealing plate 102 and performs horizontal rotation to produce a sealing effect. Gas chambers a and b are located on both sides of the rotor, forming a sealed environment to prevent gas leakage. The liquid path is used for liquid flow, and the liquid enters the tree-like microgroove 103 through the liquid path to form a liquid film. The external pressurization system is connected to the top of the compression spring 101 to apply pressure, which causes the liquid to enter the tree-like microgroove 103, injecting liquid to form an initial liquid film.

[0244] Furthermore, one aspect of the operation of a cycloidal rotor engine (or elliptical rotor engine) is that liquid viscosity leads to follow-the-rotation. Specifically, the frictional force between molecules within the liquid causes interaction between molecules when the liquid flows, affecting its flow characteristics. When the rotor moves, liquid molecules close to the rotor surface are driven by the rotor due to the viscous effect, exhibiting a tendency to move with the rotor. At this time, a boundary layer is formed on the rotor surface, and the liquid molecules in the boundary layer move along with the rotor due to its motion. As the viscous effect is transmitted, the liquid as a whole exhibits the characteristic of following the rotor's movement.

[0245] Furthermore, one of the operational scenarios of the cycloidal rotor engine (or elliptical rotor engine) is the change in cross-section of the tree-like microchannel 103 and the sudden drop in liquid velocity. The tree-like microchannel 103 is designed with a smaller cross-section in some areas and a larger cross-section in others. From the liquid flow path, when the liquid enters the small cross-section area, it flows at a higher velocity, resulting in higher dynamic pressure energy and lower static pressure energy. When the liquid enters the large cross-section area, the velocity drops sharply, and the dynamic pressure energy is converted into static pressure energy, leading to a rapid increase in pressure. Due to the decrease in velocity, a stable liquid film forms in the large cross-section area. Furthermore, when the liquid moves from a smaller cross-section area to a larger cross-section area, the cross-sectional area of ​​the liquid flow channel increases rapidly over a short distance; the liquid experiences a change in cross-section from small to large almost instantaneously. Due to the sudden increase in cross-section, the velocity drops sharply, causing the fluid's dynamic pressure energy to be rapidly converted into static pressure energy, resulting in an increase in pressure. Bernoulli's equation can explain this energy conversion in the fluid. Furthermore, the liquid has a higher velocity when flowing through the smaller cross-section area. When the liquid enters the larger cross-section area, the channel widens, and the velocity drops rapidly. This sudden drop in velocity is instantaneous, occurring within a short period. According to Bernoulli's equation, as the flow velocity decreases, the dynamic pressure energy decreases while the static pressure energy increases. The result is a rapid increase in pressure. This is due to the combined effect of the continuity equation and Bernoulli's equation in fluid mechanics; the sudden drop in velocity leads to an increase in pressure, thereby forming a stable liquid film over a larger cross-sectional area, providing a seal.

[0246] Furthermore, one aspect of operating a cycloidal rotor engine (or elliptical rotor engine) is the formation of a stable liquid film that fills minute gaps. These minute gaps are extremely small voids existing between the radial sealing plate 102 and the rotor surface; these voids form between the sealing components due to manufacturing tolerances, surface roughness, or thermal expansion; the gaps are very fine, with a scale below micrometers. In actual operation, it is impossible for a cycloidal rotor engine (or elliptical rotor engine) to be completely gap-free, and these minute voids need to be addressed. If these minute gaps are not filled, fluid leakage will occur, reducing the sealing effect. The formation of a liquid film effectively solves the gap sealing problem. Specifically, a thin layer of liquid, i.e., a liquid film, is formed between the rotor and the radial sealing plate 102. The liquid film is formed by the flow of liquid and static pressure, covering the entire contact surface of the radial sealing plate 102. The thickness of the liquid film is typically on the micrometer scale, sufficient to fill the minute gaps. Under the maintenance of rotor rotation and dynamic pressure effects, the liquid film can maintain a uniform distribution and thickness, and has the ability to resist disturbances.

[0247] Furthermore, the principle of liquid film filling minute gaps is based on the effects of liquid flow and hydrostatic and dynamic pressure. In the initial stage, external pressurization utilizes hydrostatic pressure to force liquid into the minute gaps between the radial sealing plate 102 and the rotor surface, forming an initial liquid film. After the cycloidal rotor engine (or elliptical rotor engine) starts, the rotor's rotation generates a dynamic pressure effect, maintaining the stability and uniformity of the liquid film, ensuring that the liquid film continuously fills the minute gaps, preventing gas leakage, and ensuring a highly efficient sealing effect.

[0248] Specifically, in the initial stage of a cycloidal rotor engine (or elliptical rotor engine), an external pressurization system forces liquid into the tiny gaps between the sealing plate and the rotor surface. This process utilizes externally applied hydrostatic pressure, which is the pressure of a liquid in a stagnant state. The hydrostatic pressure provided by the external pressurization system forces the liquid into all the tiny gaps, forming a liquid film. Under the action of hydrostatic pressure, the liquid flows and fills all the tiny gaps between the sealing plate and the rotor surface. This is because the hydrostatic pressure propels the liquid into these minute voids. The liquid film fills all the tiny gaps, forming a continuous liquid barrier that prevents gas from leaking through these gaps. This ensures a sealing effect in the initial stage.

[0249] Specifically, when the cycloidal rotor engine (or elliptical rotor engine) is started, the rotor begins to rotate. The rotating rotor drives the fluid to move, and due to the viscosity of the fluid, it moves along with the rotor. Dynamic pressure is the pressure generated by the fluid motion. The faster the rotor rotates, the greater the dynamic pressure generated. Dynamic pressure maintains the stability of the liquid film. The high-speed rotation of the rotor generates dynamic pressure, maintaining the stability and uniformity of the liquid film. Dynamic pressure ensures that the liquid film persists in the tiny gaps, preventing fluid loss. The dynamic pressure effect causes the liquid to form a stable liquid film between the rotor and the radial sealing plate 102. This liquid film, due to the action of dynamic pressure, maintains uniform distribution and continuity, preventing liquid from flowing out of the tiny gaps. While maintaining the liquid film, the dynamic pressure effect also ensures that the liquid film continuously fills all the tiny gaps, further preventing gas leakage and ensuring a sealing effect.

[0250] like Figure 8 The diagram shown illustrates the dynamic pressure effect of the radial sealing device of this invention, demonstrating its practical application. Liquid enters the tree-shaped microgroove 103 via a liquid path. The rotation of the rotor drives the liquid flow, creating a dynamic pressure effect. This effect causes the liquid to form a stable liquid film within the tree-shaped microgroove 103, filling the tiny gaps between the radial sealing plate 102 and the rotor surface, preventing gas leakage and achieving a highly efficient seal. This process is achieved through the combined effect of the rotor's rotation and the design of the tree-shaped microgroove 103, ensuring the sealing effect of the radial sealing device during operation.

[0251] Specifically, such as Figure 8 As shown, the liquid path is the channel through which liquid enters the surface of the radial sealing plate 102 from the external pressurization system; the liquid path penetrates the radial sealing plate 102, and through the liquid path, the liquid enters the tree-like microgroove 103. The rotor is located below the radial sealing plate 102 and rotates in the direction shown by the arrow in the figure (clockwise rotation); the rotor, as the rotating component of the cycloidal rotor engine (similar to an elliptical rotor engine), generates a dynamic pressure effect through rotational motion. Furthermore, the flow direction of the liquid in the tree-like microgroove is represented by multiple arrows, showing how the liquid flows through the tree-like microgroove 103 when the rotor rotates; the arrows indicate the path of liquid flow, showing how the liquid flows and distributes in the tree-like microgroove 103 when the rotor rotates.

[0252] Furthermore, the radial tree-like microgroove non-contact sealing device for a cycloidal rotor engine (or elliptical rotor engine) of the present invention introduces liquid (gasoline) into the central channel 104 under external pressure, relying on external pressure and dynamic pressure effect to achieve and maintain a liquid film. The specific operation is as follows: In the initial stage of operation of the cycloidal rotor engine (or elliptical rotor engine), pressure is applied by an external pressurizing device to form a liquid film. Initially, liquid (such as gasoline for the cycloidal rotor engine (or elliptical rotor engine)) is injected into the central channel 104 on the back of the radial sealing plate 102 by an external pressurizing device (such as a pump); under external pressure, the liquid flows through the oil hole 105 into the tree-like microgroove 103 on the surface of the radial sealing plate 102; as the liquid continuously flows into the tree-like microgroove 103, a uniform liquid film is formed on the surface of the radial sealing plate 102. This liquid film provides an initial non-contact sealing effect, preventing direct contact between the sealing end faces.

[0253] Specifically, when the cycloidal rotor engine (or elliptical rotor engine) reaches a stable operating stage, the pressure of the external pressurization device is adjusted to ensure that a stable liquid film forms in the tree-like microgrooves 103, achieving the initial sealing requirements. Subsequently, the liquid is evenly distributed in the tree-like microgrooves 103 through the oil holes 105, forming a continuous liquid film that covers the entire contact area between the radial sealing plate 102 and the sealed surface (i.e., the contact surface of the radial sealing plate 102), specifically the contact surface on the radial sealing plate 102 with the tree-like microgrooves 103. This contact surface area with the tree-like microgrooves 103 is crucial for the formation and maintenance of the fluid film, ensuring the stability of the sealing performance.

[0254] Furthermore, when the cycloidal rotor engine (or elliptical rotor engine) starts operating, the rotor surface rotates or moves relative to the radial sealing plate 102 at a certain speed. This relative motion causes shear forces and hydrodynamic effects to be generated in the liquid film between the radial sealing plate 102 and the rotor surface. Consequently, due to the relative motion, the fluid flows within the tree-like microgrooves 103 of the radial sealing plate 102, generating a dynamic pressure effect. The dynamic pressure effect is the pressure change caused by changes in flow velocity during fluid movement. Specifically, in the non-contact sealing device of the radial tree-like microgrooves 103, when the fluid flows at high speed within the narrow tree-like microgrooves 103, high-pressure and low-pressure zones are formed within the tree-like microgrooves 103 due to changes in the geometry of the tree-like microgrooves 103 and the effect of Bernoulli's principle. Specifically, according to Bernoulli's principle, during fluid flow, the fluid pressure decreases where the flow velocity increases and increases where the flow velocity decreases. Specifically, the continuity equation for fluid flow describes the mass conservation of fluid in a pipe or channel, meaning that the product of the flow velocity and the cross-sectional area is constant when the fluid flows through different cross-sectional areas. When fluid flows through a narrow, tree-shaped microchannel 103, changes in the cross-sectional area of ​​the microchannel 103 lead to changes in flow velocity and pressure. Specifically, the mechanism for forming high-pressure and low-pressure zones is that the geometry of the tree-shaped microchannel 103 causes changes in flow velocity as the fluid flows through different sections; the narrow sections of the microchannel 103 force the fluid to accelerate, while the wider sections cause the flow velocity to decrease. With changes in flow velocity and pressure, in the narrow sections of the tree-shaped microchannel 103, the fluid is compressed, and the flow velocity increases; according to Bernoulli's principle, the increased flow velocity leads to a decrease in pressure, but because the fluid in the narrow section is subjected to more wall compression, a relatively high-pressure zone (the narrow section of the tree-shaped microchannel 103) is formed. In the wide section of the tree-shaped microchannel 103, the fluid velocity slows down, and the fluid has more space to expand; the reduced velocity leads to increased pressure, but because the fluid flows more smoothly here, there is not much wall compression, forming a relatively low-pressure zone (the narrow section of the tree-shaped microchannel 103).

[0255] Furthermore, the pressure difference created by the dynamic pressure effect in the liquid film helps maintain a uniform liquid film on the sealing surface, preventing localized ruptures or leaks. The pressure difference drives the liquid to flow within the tree-like microgrooves 103, maintaining the continuity and stability of the liquid film. Fluid in the high-pressure zone, due to its higher pressure, flows towards the low-pressure zone, while fluid in the low-pressure zone, due to its lower pressure, is replenished by the surrounding high-pressure fluid, forming a recirculation flow path. This recirculation flow occurs because the fluid in the tree-like microgrooves 103 forms closed or partially closed circulation paths due to the pressure difference and geometry, causing the fluid to continuously circulate within these paths. The formation of high-pressure and low-pressure zones leads to recirculation flow in the tree-like microgrooves 103, and this dynamic balance allows the liquid film to exist stably on the surface of the radial sealing plate 102. The design of the tree-like microgrooves 103 causes the fluid to encounter different resistances and velocity variations in the flow path, promoting the formation of recirculation flow. This recirculation flow helps form a uniform and continuous liquid film in the tree-like microgrooves 103, covering the entire sealing surface. The recirculation flow ensures that the liquid does not accumulate or run out in the tree-like microchannel 103, but continues to flow and redistribute, maintaining the stability of the liquid film.

[0256] Furthermore, through recirculation, the hydrodynamic effect endows the liquid film with a self-regulating function, enabling it to adapt to various changes (such as vibration and eccentric motion) on the surface of the radial seal 102, maintaining consistent sealing performance. The liquid film reduces direct contact between the radial seal 102 and the rotor surface, lowering friction and wear while preventing gas or liquid leakage. Recirculation reduces the risk of fluid leakage and enhances seal reliability. During continuous operation of the cycloidal rotor engine (or elliptical rotor engine), the hydrodynamic effect continuously maintains the presence of the liquid film, ensuring the effectiveness of the non-contact seal.

Claims

1. A non-contact radial sealing device for a cycloidal rotor engine, the rotor engine comprising a rotor and a stator, the stator comprising three arc-shaped sidewalls, characterized in that, The non-contact radial sealing device includes a compression spring (101) and a radial sealing plate (102); The compression spring (101) is mechanically fixed to the top of the central channel (104) of the radial sealing plate (102) and is vertically installed on the top of the radial sealing plate (102). The stable clamping force provided by the compression spring (101) ensures that the radial sealing plate (102) is in close contact with the sealing surface. The radial sealing plate (102) has several slender, branching tree-like microgrooves (103) formed on its surface using high-precision integrated machining technology. The tree-like microgrooves (103) are distributed in a tree-like pattern, increasing the liquid flow path and forming a stable liquid film. The central groove (104) at the top of the radial sealing plate (102) extends through the entire width of the radial sealing plate (102). The tree-like microgrooves (103) are distributed around the central groove (104), and the branching structure of the tree-like microgrooves (103) extends outward from both sides of the central groove (104). The central groove (104) and the radial sealing plate (102) form a significant height difference, providing structural support and positioning. The radial sealing sheet (102) has a central channel (104) formed on its back using high-precision integrated machining technology, forming an annular channel for storing and distributing liquid. The radial sealing sheet (102) has three rows of oil holes (105) with openings on its surface. The oil holes (105) penetrate the thickness of the radial sealing sheet (102) and connect the central channel (104) on the back with the tree-shaped microgroove (103) on the surface, allowing liquid to flow from the central channel (104) into the tree-shaped microgroove (103). Liquid is allowed to flow between the central channel (104) and the tree-shaped microgroove (103) to form a liquid film. The bottom of the radial sealing sheet (102) has two symmetrical arc shapes. The central channel (104) is a long, raised structure in the shape of a regular cuboid. The central channel (104) is a long, longitudinal, narrow groove on the back of the radial sealing plate (102), arranged along the longitudinal direction of the radial sealing plate (102). The central channel (104) is located in the central part of the radial sealing plate (102), extending through its length and arranged longitudinally, allowing liquid to be evenly distributed across the entire surface of the radial sealing plate (102) from top to bottom. The sides and bottom of the central channel (104) are integral with the radial sealing plate (102). The length of the central channel (104) is the same as the width of the radial sealing plate (102), ensuring that the central channel (104) can... Support is provided across the entire width of the radial sealing strip (102); a central channel (104) is located in the center of the radial sealing strip (102) and extends across the entire width of the radial sealing strip (102); tree-shaped microgrooves (103) are distributed around the central channel (104), and the branching structure of the tree-shaped microgrooves (103) extends outward from both sides of the central channel (104); oil holes (105) are distributed at the bottom of the central channel (104) for flow passage, and the central channel (104) delivers liquid to the tree-shaped microgrooves (103) through the oil holes (105), together with the tree-shaped microgrooves (103) to provide an effective seal; the central channel (104) and the radial sealing strip (102) form a significant height difference, which provides structural support and positioning.

2. The non-contact radial sealing device for a cycloidal rotor engine according to claim 1, characterized in that, The compression spring (101) is a cylindrical spiral structure; one end of the compression spring (101) is fixed to the top of the central groove (104) of the radial sealing plate (102) by welding, providing fixing capacity and withstanding large compression and tension forces; the compression spring (101) corresponds to the tree-shaped microgroove (103) and the central groove (104) of the radial sealing plate (102), and is evenly distributed at several fixed positions on the top of the radial sealing plate (102), ensuring that the sealing contact surface of the compression spring (101) and the radial sealing plate (102) fits together.

3. The non-contact radial sealing device for a cycloidal rotor engine according to claim 1, characterized in that, The tree-like microgroove (103) is shaped like a tree branch with multiple branches that spread outward from the center, guiding liquid flow and forming a liquid film. Each branch extends outward from the center, ensuring that the liquid flow path covers the entire radial sealing sheet (102) and that the liquid is evenly distributed on the surface of the radial sealing sheet (102), increasing the contact area with the sealed surface. When the liquid flows in the tree-like microgroove (103), it forms a uniform liquid film that covers the surface of the radial sealing sheet (102). The tree-like microgroove (103) is directly integrally formed on the surface of the radial sealing sheet (102) and connected to the central channel (104) through the oil hole (105), ensuring smooth liquid flow.

4. The non-contact radial sealing device for a cycloidal rotor engine according to claim 1, characterized in that, The oil hole (105) is a circular hole penetrating the thickness of the radial sealing plate (102), connecting the back and surface of the radial sealing plate (102) to form a liquid channel from the central channel (104) to the tree-shaped microgroove (103). The oil hole (105) corresponds to the branching structure of the tree-shaped microgroove (103), and one oil hole (105) is provided on each branching structure of the tree-shaped microgroove (103). The liquid creates a lubricating effect in the oil hole (105); several oil holes (105) are evenly arranged in three rows along the longitudinal direction of the central channel (104), and are evenly distributed from the beginning to the end of the central channel (104); each oil hole (105) is located at the bottom center line of the central channel (104), and each oil hole (105) is evenly spaced to ensure that the liquid is evenly distributed on the entire radial sealing plate (102) surface; several oil holes (105) are evenly arranged in three rows along the longitudinal direction of the central channel (104), and are evenly distributed from the beginning to the end of the central channel (104); one end of the oil hole (105) opens at the bottom of the central channel (104), guiding the liquid in the central channel (104) into the oil hole (105), ensuring that the liquid can smoothly enter the distribution area from the storage area.

5. The non-contact radial sealing device for a cycloidal rotor engine according to claim 1, characterized in that, The radial sealing sheet (102) has a rectangular curved surface structure and presents an overall downward curved arc with a curvature of 0.001 to 0.

005.

6. The non-contact radial sealing device for a cycloidal rotor engine according to claim 1, characterized in that, The compression spring (101) has 3 to 6 springs, a spring constant of 0.49 N / m, a compression length of 2.6 mm, a maximum compression of 2.25 mm, 5 effective coils, and a coil spacing of 0.7 mm. This ensures that the elastic deformation of the compression spring (101) can adapt to the small displacement of the radial sealing plate (102) and absorb the impact force caused by vibration and eccentric movement.

7. A non-contact radial sealing device for a cycloidal rotor engine according to claim 1 or 3, characterized in that, The depth of the tree-shaped microgroove (103) and the number of tree-shaped grooves are 8 to 12.

8. A non-contact radial sealing device for a cycloidal rotor engine according to claim 1 or 5, characterized in that, The diameter of the oil hole (105) is 1 mm, and the number of oil holes (105) is 8 to 12.

9. The non-contact radial sealing device for a cycloidal rotor engine according to claim 2, characterized in that, The compression spring (101) is made of high-strength metal wire, and the spring material includes stainless steel spring wire, chromium silicon spring steel wire and nickel alloy spring wire.

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