Sealing structure of a rotary engine and method of operation thereof, rotary engine

Abstract

The present application belongs to the technical field of engine equipment, and particularly relates to a sealing structure of a rotor engine, a working method of the sealing structure and the rotor engine. The sealing structure comprises: an end cover arranged at the end of a rotor; two arc-shaped sealing strips slidingly arranged in the end cover; a radial pushing assembly arranged at the side of the sealing strip away from a cylinder; and a spring sheet arranged between the sealing strip and the radial pushing assembly. During operation, centrifugal force generated by the rotation of the rotor applies an initial supporting force to the middle part of the sealing strip by the radial pushing assembly; high-pressure gas in the cylinder chamber enters a back pressure chamber to drive the sealing strip to further radially displace to abut against the inner wall of the cylinder. The radial pushing assembly pushes the middle part of the sealing strip by a wedge-shaped pushing block to balance the forces at both ends, thereby solving the problem of eccentric wear and leakage.

Description

Technical Field

[0001] This invention belongs to the field of engine equipment technology, specifically relating to the sealing structure of an engine, and more particularly to a sealing structure and working method of a rotary engine, and a rotary engine. Background Technology

[0002] Traditional rotary engines rely on end face seals at the apex of the triangular rotor to divide the cylinder into three chambers. These seals are typically preloaded by a single, curved spring plate mounted on the back to maintain a dynamic seal with the cylinder wall.

[0003] However, due to the eccentric rotation of the rotor within the cylinder cavity, the sealing strip is subjected to asymmetrical forces due to the coupling of centrifugal force, combustion gas pressure, and inertial force. A single spring plate, with its limited stiffness, is ill-suited to this complex operating condition. Furthermore, under prolonged high-frequency alternating loads, the spring plate is prone to stiffness degradation and fatigue relaxation, leading to uneven support forces at both ends of the sealing strip and consequently, differences in frictional force. This not only causes uneven wear of the sealing strip but also results in high-pressure combustion gas leakage, severely limiting engine life.

[0004] Therefore, how to solve the problem of seal failure caused by uneven force on both ends of the sealing strip when the rotor rotates eccentrically in the cylinder cavity is a technical problem that urgently needs to be solved by those skilled in the art.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0006] This disclosure provides at least one sealing structure and its working method for a rotary engine, and a rotary engine.

[0007] In a first aspect, embodiments of this disclosure provide a sealing structure for a rotary engine, comprising: End caps are located at the ends of the rotor; A sealing strip, the two ends of which are slidably disposed inside the end cover, and the side of the sealing strip facing the cylinder is arc-shaped; A radial pushing assembly is provided on the side of the sealing strip away from the cylinder, and a back pressure chamber is provided inside the radial pushing assembly, which is connected to the chamber of the cylinder; A spring sheet, disposed between the sealing strip and the radial push assembly, is used to provide a preload force to the sealing strip toward the inner wall of the cylinder; Wherein, under the centrifugal force generated by the rotation of the rotor, the radial pushing assembly is adapted to apply an outward initial support force to the center of the sealing strip; and, The high-pressure gas in the cylinder chamber enters the back pressure chamber, and the gas pressure in the back pressure chamber drives the sealing strip to produce a further radial displacement, causing the sealing strip to move outward and abut against the inner wall of the cylinder.

[0008] In one alternative embodiment, the radial jacking assembly includes a jacking rod with a wedge-shaped jacking block disposed at the center of the jacking rod; The sealing strip has a receiving cavity in the middle region that is adapted to the wedge-shaped top block. The wedge-shaped top block is at least partially received in the receiving cavity, and the wedge-shaped working surface of the wedge-shaped top block abuts against or is adjacent to the bottom surface of the receiving cavity.

[0009] In one optional embodiment, the interior of the wedge-shaped top block is hollow to form a back pressure cavity, and a first air hole is provided on the side of the wedge-shaped top block away from the cylinder. A corresponding through hole is provided on the spring plate, and the first air hole passes through the through hole and communicates with the back pressure cavity.

[0010] In one optional embodiment, a second air hole is provided on the end sidewall of the sealing strip, and the second air hole extends along the length of the sealing strip to the chamber where the radial push assembly is located, so that the back pressure chamber is connected to the chamber of the cylinder.

[0011] In one optional embodiment, a groove is provided inside the end cap, and both ends of the sealing strip are slidably disposed within the groove; The two ends of the push rod of the radial push assembly extend into the slide groove, and the side of the push rod facing away from the cylinder abuts against the bottom of the slide groove.

[0012] In one optional embodiment, the spring sheet is arc-shaped, with its two ends abutting against the two ends of the sealing strip, and the arc-shaped support surface of the spring sheet abutting against the push rod of the radial push assembly.

[0013] In one alternative embodiment, when the rotor is stationary or rotating at low speed, the spring plate provides a preload force to the sealing strip toward the inner wall of the cylinder, causing the arcuate surface of the sealing strip to abut against the inner wall of the cylinder to maintain the initial seal.

[0014] In one alternative embodiment, when the rotor rotates at high speed, the push rod and the wedge-shaped top block in the middle are subjected to the combined action of centrifugal force and high-pressure gas. The wedge-shaped top block is adapted to push the middle of the sealing strip, causing the sealing strip to move towards the inner wall of the cylinder, so as to balance the force on both ends of the sealing strip.

[0015] Secondly, the present disclosure also provides a method for operating a sealing structure of a rotary engine, including: when the rotor is in a stationary or low-speed rotating state, a spring sheet disposed between the sealing strip and the radial push assembly provides a pre-tightening force to the sealing strip toward the inner wall of the cylinder, so that the arc-shaped surface of the sealing strip abuts against the inner wall of the cylinder to maintain the initial seal; When the rotor rotates at high speed, the radial pushing assembly applies an outward initial support force to the center of the sealing strip under the action of the centrifugal force generated by the rotor rotation; The high-pressure gas in the cylinder chamber enters the back pressure chamber inside the radial push assembly through the second air hole. The gas pressure in the back pressure chamber drives the wedge-shaped top block to push the middle of the sealing strip, so as to balance the force on both ends of the sealing strip and drive the sealing strip to translate towards the inner wall of the cylinder.

[0016] Thirdly, embodiments of this disclosure also provide a rotary engine, comprising: Rotor; Cylinder, the enclosing chamber that forms the working chamber of the cylinder; and, The aforementioned rotary engine sealing structure is located at the end of the rotor, and the sealing strip is arc-shaped on the side facing the cylinder working chamber and slides against the inner wall of the cylinder working chamber.

[0017] The beneficial effects of this invention are that the sealing structure and working method of this rotary engine, by introducing a radial jacking assembly, provides a basic preload force to maintain the initial seal when the rotor is stationary or at low speed; when the rotor rotates at high speed in the cylinder cavity, the centrifugal force and the high-pressure gas in the cylinder act together on the radial jacking assembly, using gas pressure and centrifugal force to drive the sealing strip to generate further radial displacement; wherein, the radial jacking assembly acts on the middle of the sealing strip, balancing the support force at both ends of the sealing strip, eliminating uneven wear caused by uneven force, and improving the reliability of the seal and the service life of the engine.

[0018] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and drawings.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 A perspective view of a rotary engine provided in an embodiment of this disclosure; Figure 2 for Figure 1 Structural diagram of the sealing structure of the rotary engine in section A; Figure 3 for Figure 1 A perspective view of the sealing structure of the rotary engine in section A; Figure 4 for Figure 1 A three-dimensional view of the sealing structure of the rotary engine in section A from another perspective.

[0022] In the picture: 100. End cap; 110. Slide groove; 200, sealing strip; 210, receiving cavity; 220, second vent; 300, Radial jacking assembly; 310, Jacking rod; 320, Wedge-shaped jacking block; 321, Back pressure chamber; 322, First vent; 400. Spring sheet; 500, Rotor; 600, cylinder; 610, chamber. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0025] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0026] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0027] Research revealed the following drawbacks of existing technology: Due to the eccentric rotation of the rotor within the cylinder cavity, the sealing strip is subjected to asymmetrical stress due to the coupling effects of centrifugal force, combustion gas pressure, and inertial force. The single-piece spring plate, with its limited stiffness, is ill-suited to this complex operating condition. Furthermore, under prolonged high-frequency alternating loads, the spring plate is prone to stiffness degradation and fatigue relaxation, leading to uneven support forces at both ends of the sealing strip and consequently, differences in frictional force. This not only causes uneven wear of the sealing strip but also results in high-pressure combustion gas leakage, severely limiting engine life.

[0028] Based on the above research, this disclosure provides a sealing structure and working method for a rotary engine. By setting a radial pushing assembly with a back pressure cavity on the back of the sealing strip, the inherent high-pressure gas of the rotary engine is used as a power source to transform the passive support of the traditional spring sheet into an active load equalization driven by the back pressure cavity, so that the sealing strip can be translated with the middle as the fulcrum. This overcomes the aging defects of the spring sheet and eliminates the force difference between the two ends of the sealing strip.

[0029] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0032] See Figure 2 This disclosure provides a sealing structure for a rotary engine, including: an end cover 100, which is fixedly disposed at the end of a rotor 500 and serves as a supporting frame for the sealing structure. A groove 110 is formed on the inner sidewall of the end cover 100. Both ends of a sealing strip 200 are slidably disposed within the groove 110 of the end cover 100, and the side of the sealing strip 200 facing the cylinder 600 is machined into an arc shape, with the arc-shaped surface directly contacting the inner wall of the cylinder 600 to achieve a seal. A radial push assembly 300 is disposed on the side of the sealing strip 200 away from the cylinder 600. The radial push assembly 300 includes a push rod 310, both ends of which extend into the groove 110 of the end cover 100, and the side of the push rod away from the cylinder 600 maintains abutment against the bottom of the groove 110. A spring plate 400 is disposed between the sealing strip 200 and the radial push assembly 300; specifically, the spring plate 400 is arc-shaped, with its two ends abutting against the two ends of the sealing strip 200, while its arc-shaped support surface abuts against the push rod 310 of the radial push assembly 300. Under normal conditions, the spring plate 400 uses its own elasticity to continuously provide an initial preload force toward the inner wall of the cylinder 600 to the sealing strip 200.

[0033] See also Figure 2 and Figure 4 In some embodiments, a wedge-shaped top block 320 is provided in the middle of the push rod 310. Correspondingly, a receiving cavity 210 adapted to the wedge-shaped top block 320 is opened in the middle region of the sealing strip 200. The wedge-shaped top block 320 is at least partially received in the receiving cavity 210, and the wedge-shaped working surface of the wedge-shaped top block 320 abuts against or is adjacent to the bottom surface of the receiving cavity 210. By setting the matching structure between the wedge-shaped top block 320 and the receiving cavity 210, when the radial pushing assembly 300 moves outward under the action of centrifugal force or gas pressure, the wedge-shaped working surface of the wedge-shaped top block 320 will act on the bottom surface of the receiving cavity 210, converting the radial thrust into an outward lifting force on the middle of the sealing strip 200, thereby causing the sealing strip 200 to translate with the middle as the fulcrum, so that both ends of the sealing strip 200 abut against the inner wall of the cylinder 600 evenly, which can effectively improve the problem of uneven force at both ends.

[0034] See Figure 2 and 3In some embodiments, the wedge-shaped top block 320 is hollow to form a back pressure cavity 321, and a first air hole 322 is provided on the side of the wedge-shaped top block 320 away from the cylinder 600. A corresponding through hole is provided on the spring plate 400, and the first air hole 322 passes through the through hole of the spring plate 400 and communicates with the back pressure cavity 321. Further, a second air hole 220 is provided on the end sidewall of the sealing strip 200. The second air hole 220 extends along the length of the sealing strip 200 to the chamber 610 where the radial push assembly 300 is located (the area where the back pressure cavity 321 is located), so that the back pressure cavity 321 communicates with the chamber 610 of the cylinder 600. The high-pressure gas in the chamber 610 of the cylinder 600 can enter the chamber 610 where the radial push assembly 300 is located through the second air hole 220, and then enter the back pressure cavity 321 through the first air hole 322 (airflow path as shown). Figure 3 As indicated by the middle arrow, a stable gas pressure is formed in the back pressure chamber 321. This gas pressure acts on the wedge-shaped top block 320, forcing it to move towards the inner wall of the cylinder 600. Since the working surface of the tip of the wedge-shaped top block 320 is embedded in the receiving cavity 210 in the middle of the sealing strip 200, the movement of the wedge-shaped top block 320 directly supports the bottom of the receiving cavity 210. Through the inclined surface cooperation, the thrust is converted into a radial support force on the sealing strip 200, thereby driving the sealing strip 200 to produce a further radial displacement, making it tightly fit against the inner wall of the cylinder 600, providing additional radial driving force for the sealing strip 200. Moreover, the gas pressure automatically changes with the engine operating conditions, realizing adaptive adjustment of the sealing force, while also sharing the load of the spring plate 400 and delaying the fatigue relaxation of the spring plate 400.

[0035] See Figure 2 In some embodiments, both ends of the push rod 310 extend into the groove 110, and the side of the push rod 310 facing away from the cylinder 600 abuts against the bottom of the groove 110. When the wedge-shaped push block 320 moves under the gas pressure of the back pressure chamber 321, the reaction force it generates is transmitted to the bottom of the groove 110 through the push rod 310. That is to say, the groove 110 not only constrains the sealing strip 200, but also serves as a reaction force receiving seat for the radial push assembly 300. The spring plate 400 is arc-shaped, with its two ends abutting against the root of the sealing strip 200 (i.e., the area where the inclined surface of the second air hole 220 is located intersects with the inner surface of the sealing strip 200). The arc-shaped support surface of the spring plate 400 abuts against the push rod 310. When the rotor 500 is stationary or rotating at a low speed (below the preset speed threshold, such as 2000 rpm), the centrifugal force is small, and the push rod 310 remains stable under the axial limit at the bottom of the slide groove 110. The two ends of the spring plate 400 abut against the root of the sealing strip 200, transmitting the elastic restoring force to the sealing strip 200, providing a pre-tightening force towards the inner wall of the cylinder 600 to the sealing strip 200, so that the arc-shaped surface of the sealing strip 200 abuts against the inner wall of the cylinder 600 to maintain the initial seal.

[0036] See Figure 3 and Figure 4 In some embodiments, when the rotor 500 rotates at high speed (above a preset speed threshold, such as above 3000 rpm), the high-speed rotation of the rotor 500 generates a significant centrifugal force. This centrifugal force is transmitted to the wedge-shaped top block 320 through the top rod 310, so that the second air hole 220 on the side wall of the wedge-shaped top block 320 is connected to the chamber 610 of the cylinder 600. At the same time, the high-pressure gas in the chamber 610 of the cylinder 600 is continuously injected into the back pressure chamber 321 through the second air hole 220 and the first air hole 322, forming a strong gas pressure in the back pressure chamber 321. Under the combined drive of the centrifugal force and the high-pressure gas, the wedge-shaped top block 320 moves towards the inner wall of the cylinder 600, and its wedge-shaped working surface abuts against and pushes the bottom surface of the middle receiving cavity 210 of the sealing strip 200. Due to the special geometry of the wedge-shaped top block 320, its movement stroke is converted into a radial thrust on the sealing strip 200. Under the pushing action of the wedge-shaped top block 320, the sealing strip 200 undergoes translation with its center as the fulcrum. Specifically, the lifting force of the wedge-shaped top block 320 on the center of the sealing strip 200 forces both ends of the sealing strip 200 to adhere to the inner wall of the cylinder 600, balancing the force distribution at both ends of the sealing strip 200 and eliminating the local friction overheating phenomenon caused by uneven force distribution, thereby solving the problem of uneven wear of the sealing strip 200 mentioned in the background art.

[0037] See Figure 3 and Figure 4 Some embodiments also provide a method for operating the sealing structure of the rotor 500 engine, including: when the rotor 500 is stationary or rotating at low speed, the spring sheet 400 disposed between the sealing strip 200 and the radial push assembly 300 provides a preload force to the sealing strip 200 toward the inner wall of the cylinder 600, so that the arc-shaped surface of the sealing strip 200 abuts against the inner wall of the cylinder 600 to maintain the initial seal; when the rotor 500 rotates at high speed, the radial push assembly 300 applies an outward initial support force to the middle of the sealing strip 200 under the action of the centrifugal force generated by the rotation of the rotor 500; the high-pressure gas in the chamber 610 of the cylinder 600 enters the back pressure chamber 321 inside the radial push assembly 300 through the second air hole 220, and uses the gas pressure in the back pressure chamber 321 to drive the wedge-shaped top block 320 to push the middle of the sealing strip 200 to balance the force on both ends of the sealing strip 200 and drive the sealing strip 200 to translate toward the inner wall of the cylinder 600.

[0038] See Figure 1 and Figure 2Some embodiments also provide a rotor 500 engine, including a triangular rotor 500 rotatably housed within a cylinder 600, forming three variable-volume working chambers 610. A sealing structure, serving as a core barrier to prevent high-pressure combustion gas leakage, is integrated into the apex end face of the rotor 500. Specifically, an end cap 100 is fixedly mounted on the end of the rotor 500 and rotates with it. A sealing strip 200 is slidably disposed on the end cap 100 via grooves 110 at both ends, and the arcuate surface of the outer end of the sealing strip 200 always maintains close contact with the inner wall of the cylinder 600. During engine operation, as the rotor 500 rotates eccentrically, the sealing strip 200 not only bears the normal support force of the inner wall of the cylinder 600 but also receives dynamic radial preload through the radial push assembly 300 and spring plate 400 on its back.

[0039] In summary, the sealing structure and operating method of this rotary engine, through the introduction of the radial jacking assembly 300, provides a basic preload force to maintain the initial seal when the rotor 500 is stationary or at low speed. When the rotor 500 rotates at high speed, centrifugal force and high-pressure gas from the cylinder 600 act together on the radial jacking assembly 300, using gas pressure and centrifugal force to drive the sealing strip 200 to generate further radial displacement. The radial jacking assembly 300 acts on the middle of the sealing strip 200, balancing the support force at both ends of the sealing strip 200, eliminating the problem of uneven wear caused by uneven force, and improving the reliability of the seal and the service life of the engine.

[0040] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0041] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0042] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0043] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A sealing structure for a rotary engine, characterized in that, include: An end cap (100) is disposed at the end of the rotor (500); A sealing strip (200) has its two ends slidably disposed inside the end cap (100), and the side of the sealing strip (200) facing the cylinder (600) is arc-shaped; A radial push assembly (300) is provided on the side of the sealing strip (200) away from the cylinder (600), and a back pressure chamber (321) is provided inside the radial push assembly (300), which is connected to the chamber (610) of the cylinder (600). A spring sheet (400) is disposed between the sealing strip (200) and the radial push assembly (300) for providing a preload force to the sealing strip (200) toward the inner wall of the cylinder (600); Wherein, under the centrifugal force generated by the rotation of the rotor (500), the radial pushing assembly (300) is adapted to apply an outward initial support force to the center of the sealing strip (200); and, The high-pressure gas in the cylinder (600) chamber (610) enters the back pressure chamber (321), and the gas pressure in the back pressure chamber (321) drives the sealing strip (200) to generate further radial displacement, so that the sealing strip (200) moves outward and abuts against the inner wall of the cylinder (600).

2. The sealing structure as described in claim 1, characterized in that, The radial jacking assembly (300) includes a jacking rod (310), and a wedge-shaped jacking block (320) is provided in the middle of the jacking rod (310). The central region of the sealing strip (200) has a receiving cavity (210) adapted to the wedge-shaped top block (320), the wedge-shaped top block (320) is at least partially housed in the receiving cavity (210), and the wedge-shaped working surface of the wedge-shaped top block (320) abuts against or is adjacent to the bottom surface of the receiving cavity (210).

3. The sealing structure as described in claim 2, characterized in that, The interior of the wedge-shaped top block (320) is hollow to form a back pressure cavity (321), and a first air hole (322) is opened on the side of the wedge-shaped top block (320) away from the cylinder (600). A corresponding through hole is provided on the spring plate (400), and the first air hole (322) passes through the through hole and communicates with the back pressure cavity (321).

4. The sealing structure as described in claim 1, characterized in that, The end sidewall of the sealing strip (200) is provided with a second air hole (220), which extends along the length of the sealing strip (200) to the chamber (610) where the radial push assembly (300) is located, so that the back pressure chamber (321) is connected to the chamber (610) of the cylinder (600).

5. The sealing structure as described in claim 1, characterized in that, The end cap (100) has a groove (110) inside, and the two ends of the sealing strip (200) are slidably disposed in the groove (110); The two ends of the push rod (310) of the radial push assembly (300) extend into the slide groove (110), and the side of the push rod (310) facing away from the cylinder (600) abuts against the bottom of the slide groove (110).

6. The sealing structure as described in claim 1, characterized in that, The spring sheet (400) is arc-shaped, and its two ends abut against the two ends of the sealing strip (200). The arc-shaped support surface of the spring sheet (400) abuts against the push rod (310) of the radial push assembly (300).

7. The sealing structure as described in claim 6, characterized in that, When the rotor (500) is stationary or rotating at low speed, the spring plate (400) provides a preload force to the sealing strip (200) toward the inner wall of the cylinder (600), so that the arc-shaped surface of the sealing strip (200) abuts against the inner wall of the cylinder (600) to maintain the initial seal.

8. The sealing structure as described in claim 7, characterized in that, When the rotor (500) rotates at high speed, the push rod (310) and the wedge-shaped top block (320) in the middle are subjected to the combined action of centrifugal force and high-pressure gas. The wedge-shaped top block (320) is adapted to push the middle of the sealing strip (200) so that the sealing strip (200) moves towards the inner wall of the cylinder (600) to balance the forces on both ends of the sealing strip (200).

9. A method for operating a sealing structure of a rotary (500) engine, characterized in that, include: When the rotor (500) is stationary or rotating at low speed, the spring sheet (400) located between the sealing strip (200) and the radial push assembly (300) provides a preload force to the sealing strip (200) toward the inner wall of the cylinder (600), so that the arc-shaped surface of the sealing strip (200) abuts against the inner wall of the cylinder (600) to maintain the initial seal; When the rotor (500) rotates at high speed, the radial push assembly (300) applies an outward initial support force to the middle of the sealing strip (200) under the action of the centrifugal force generated by the rotation of the rotor (500); The high-pressure gas in the cylinder (600) chamber (610) enters the back pressure chamber (321) inside the radial push assembly (300) through the second air hole (220). The gas pressure in the back pressure chamber (321) drives the wedge-shaped top block (320) to push the middle part of the sealing strip (200) to balance the force on both ends of the sealing strip (200) and drive the sealing strip (200) to translate towards the inner wall of the cylinder (600).

10. A rotary (500) engine, characterized in that, include: Rotor (500); Cylinder (600), and a working chamber (610) enclosing the cylinder (600); and, The sealing structure of the rotary engine as described in any one of claims 1 to 8, wherein the sealing structure is disposed at the end of the rotor (500), and the sealing strip (200) is arc-shaped on the side facing the working chamber of the cylinder (600) and slides against the inner wall of the working chamber of the cylinder (600).

Images