Wrapping type radial sealing fin with elastic compensation

Abstract

The utility model belongs to the technical field of sealing devices of internal combustion engines, and particularly relates to a wrapping type radial sealing fin with elastic compensation, which comprises a U-shaped sealing fin body, and an elastic sealing structure with elasticity is arranged on the portion, in contact with an end face sealing ring, of the sealing fin body. The elastic sealing structure can be elastically bent in the rotating direction of the rotor. The problem that a wrapping type radial sealing piece of the cycloid rotor engine is prone to deformation and failure is solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of internal combustion engine sealing devices, specifically relating to a wrap-around radial sealing sheet with elastic compensation. Background Technology

[0002] With advancements in engine technology, the demand for higher power density is increasing. Rotary engines, with their high power density, have become the primary power source for range-extended electric vehicles and small drones. Compared to triangular rotor engines, cycloidal rotor engines swap the rotor and cylinder block, offering advantages such as higher power density, a higher compression ratio (easier to adjust), easier lubrication, and more even heating. The core issues of cycloidal rotor engines remain sealing and friction. They maintain a tight seal along the radial edge of the rotor, which is crucial for ensuring cylinder pressure in the combustion chamber. Better sealing improves fuel efficiency, increases power output, provides a better combustion environment, and results in more environmentally friendly emissions.

[0003] During rotor installation, the end-face sealing ring cannot be fully compressed by the spring, resulting in a leakage area on the rotor end face and end cover surface. This area significantly affects the engine cylinder pressure, necessitating a wrap-around radial seal to seal this area. However, in actual use, because this wrap-around area contacts the end-face sealing ring, which is prone to deformation under stress, the wrap-around radial seal fails to provide a proper seal. Utility Model Content

[0004] The present invention aims to provide a wrap-around radial seal with elastic compensation to solve the problem that the wrap-around radial seal of cycloidal rotor engines is prone to deformation and failure.

[0005] To achieve the above objectives, the present invention provides a wrap-around radial sealing sheet with elastic compensation, comprising a sealing sheet body, the sealing sheet body being U-shaped, and an elastic sealing structure being provided on the portion of the sealing sheet body that contacts the end face sealing ring, the elastic sealing structure being capable of elastic bending along the rotor rotation direction.

[0006] The working principle and beneficial effects of this solution are as follows:

[0007] During the rotation of the rotor in a rotary engine, the enclosed arc-shaped position remains in tangential contact with the end face sealing ring. At this point, the radial sealing sheet is subjected to force, and the elastic sealing structure shifts in the direction of this force. This shift imparts elastic potential energy (i.e., elastic force) to the elastic sealing structure, resulting in better tangential contact. Compared to a monolithic structure at this position, the shift of the elastic sealing structure reduces the force on the end face sealing ring (the monolithic structure lacks elasticity, and during rotation, the eccentric rotation of the rotor generates a reaction force on the end face sealing ring). This reduces the force on the end face sealing ring while ensuring a seal, thus solving the problem of easy deformation and failure of the enclosed radial sealing sheet, and ensuring the protection of the end face sealing ring.

[0008] For rotary engines, the rotor rotation is an eccentric rotation, requiring high precision in the profile of the end face sealing ring. External pressure can easily deform the ring, leading to jamming and failure. This solution uses an elastic sealing method at the contact point between the sealing sheet and the end face sealing ring (i.e., the wrapping area). This ensures a good seal without placing excessive pressure on the end face sealing ring.

[0009] For existing rotary engines that use traditional encapsulated radial seals, only minor modifications to the engine structure are needed. Simply make openings at the radial seal positions of the front and rear end covers to accommodate the protruding portion, and the original radial seals can be replaced with the seals in this solution, making this solution easy to promote.

[0010] Optionally, the resilient sealing structure is integrally or detachably connected to the sealing sheet body.

[0011] Optionally, the resilient sealing structure includes a plurality of sealing units arranged in parallel to each other.

[0012] Optionally, the sealing monomer is in the form of a sheet, strip, or filament.

[0013] Optionally, gaps are provided between the sealing units in their natural extended state. These gaps between the sealing units can increase heat dissipation from the radial sealing sheet and reduce weight compared to a monolithic, resilient sealing structure.

[0014] Optionally, the sealing unit includes a brush-type sealing unit, which has a bent portion at the end away from the sealing sheet body, and all bent portions of the sealing units bend to the same side. This allows the sealing unit to better fit the end face sealing ring, thereby enhancing the sealing effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a wrap-around radial sealing sheet with elastic compensation according to an embodiment of the present invention;

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the brush-type sealing unit;

[0017] Figure 3 This is a schematic diagram of the installation of the radial sealing sheet and the end face sealing ring in an embodiment of this utility model. Detailed Implementation

[0018] The following detailed description illustrates the specific implementation method:

[0019] The markings in the accompanying drawings include: 1. sealing sheet body, 2. elastic sealing structure, 3. sealing unit, 4. bending part, 5. end face sealing ring, and 6. rotor.

[0020] Example

[0021] This embodiment is basically as follows: Figure 1 , Figure 2 , Figure 3 As shown: A wrap-around radial sealing sheet with elastic compensation includes a sealing sheet body 1, which is U-shaped. The portion of the sealing sheet body 1 that contacts the end face sealing ring 5 is provided with an elastic sealing structure 2, which can be made of wear-resistant spring steel. The elastic sealing structure 2 is integrally designed with the sealing sheet body 1, and the entire wrap-around radial sealing sheet is H-shaped. In other embodiments, the elastic sealing structure 2 can be detachably connected to the sealing sheet body 1. Specifically, a groove is formed on the sealing sheet body 1, and the elastic sealing mechanism is embedded in a base. The base is inserted into the groove, thereby achieving a detachable connection. Compared to the integral design, the detachable structure makes it easier to replace the elastic sealing structure 2.

[0022] In this embodiment, the sealing unit 3 is sheet-shaped, and there are gaps between the sealing units 3 in their naturally extended state. Specifically, the sealing unit 3 includes a brush-type sealing unit 3, and the brush-type sealing unit 3 has a bent portion 4 at the end away from the sealing sheet body 1. All the bent portions 4 of the sealing units 3 are bent to the same side in the rotation direction of the rotor 6.

[0023] In this embodiment, during the rotation of the rotor 6 of the rotor 6 engine, the elastic sealing structure 2 is in a wrapped arc-shaped position, and its brush-type sealing unit 3 is always in tangential contact with the end face sealing ring 5. At this time, the radial sealing sheet will be subjected to force, and all brush-type sealing units 3 will be offset in the direction of this force. The offset will give the elastic sealing structure 2 elastic potential energy. The offset of the elastic sealing structure 2 can reduce the force on the end face sealing ring 5, thereby reducing the force on the end face sealing ring 5 while sealing, thus solving the problem that the wrapped radial sealing sheet is prone to deformation and failure, and ensuring that it plays a role in protecting the end face sealing ring 5.

[0024] The above are merely embodiments of this utility model. This utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solution are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are able to access all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims. The specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A wrap-around radial sealing sheet with elastic compensation, characterized in that: It includes a sealing sheet body, which is U-shaped. The part of the sealing sheet body that contacts the end face sealing ring is provided with an elastic sealing structure. The elastic sealing structure can bend elastically along the rotor rotation direction.

2. The wrap-around radial sealing sheet with elastic compensation according to claim 1, characterized in that: The elastic sealing structure is integrated with or detachably connected to the sealing sheet body.

3. A wrap-around radial sealing sheet with elastic compensation according to claim 2, characterized in that: The elastic sealing structure consists of several sealing units arranged in parallel to each other.

4. A wrap-around radial sealing sheet with elastic compensation according to claim 3, characterized in that: The sealing monomer is in the form of flakes, strips, or filaments.

5. A wrap-around radial sealing sheet with elastic compensation according to claim 4, characterized in that: There is a gap between the sealing units in their natural extended state.

6. A wrap-around radial sealing sheet with elastic compensation according to claim 5, characterized in that: The sealing unit includes a brush-type sealing unit, which has a bent portion at the end away from the sealing sheet body, and all the bent portions of the sealing units bend to the same side.

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