A flame blocking structure, a flame blocking method, and an engine

Abstract

The application discloses a flame blocking structure, a flame blocking method and an engine, which comprise a cylinder liner, a cylinder head, a cylinder head gasket and a flame blocking ring. The cylinder head gasket is located between the cylinder liner and the cylinder head, and the flame blocking ring is located between a combustion chamber and the cylinder head gasket. The bottom end of the flame blocking ring is fixed to the top surface of the cylinder liner, the top end of the flame blocking ring abuts against the bottom surface of the cylinder head, and the flame blocking ring has elastic deformation at least partially in the axial direction. The flame blocking ring is arranged between the cylinder liner and the cylinder head as a separate component, can better assist the cylinder head gasket to realize the sealing between the cylinder head and the cylinder liner, can play a blocking and weakening role in the axial and radial directions on the high-temperature and high-pressure explosion shock gas generated in the combustion chamber when the engine is in the explosion pressure working condition or explosion, thereby avoiding the impact on the cylinder head gasket, and realizing the stable sealing effect. In addition, the elastic deformation of the flame blocking ring makes the axial force from the cylinder head be compressed, avoids the transmission of excessive pressure to the cylinder liner and causes damage, and realizes the protection of the cylinder liner.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of engine flame barrier structure, and particularly relates to a flame barrier structure, a flame barrier method and an engine. BACKGROUND

[0002] The cylinder head gasket is a key component for sealing the combustion chamber of an engine, and the flame barrier structure plays an important role in assisting the sealing of the cylinder head gasket.

[0003] In the prior art, a flame barrier platform is usually formed by protruding at the top of the cylinder sleeve to reduce the pulse impact and temperature rise of high-temperature and high-pressure combustion gas on the cylinder head gasket. However, there is a gap between the existing flame barrier platform and the cylinder head. When the engine is under the condition of explosion pressure or knocking, the impact of high-temperature and high-pressure combustion gas in the combustion chamber will directly impact the cylinder head gasket through the gap between the flame barrier platform and the cylinder head, which will not only cause the impact deformation or ablation of the cylinder head gasket, so that the cylinder head gasket cannot continue to realize good sealing effect, but also may cause the collision between the deformed cylinder sleeve flame barrier platform and the cylinder head due to high temperature, resulting in the fracture of the cylinder sleeve and affecting the stability of the engine operation. SUMMARY

[0004] The application provides a flame barrier structure, a flame barrier method and an engine, which realize the close contact sealing between the flame barrier structure and the cylinder head under different working conditions of the engine, assist in improving the sealing operation reliability of the cylinder head gasket, and avoid the fracture failure of the cylinder sleeve caused by the load transmitted by the cylinder head.

[0005] The technical scheme adopted by the application is as follows:

[0006] A flame barrier structure, comprising a cylinder sleeve, a cylinder head, a cylinder head gasket and a flame barrier ring, the cylinder head gasket is located between the cylinder sleeve and the cylinder head, the flame barrier ring is located between the combustion chamber and the cylinder head gasket, the bottom end of the flame barrier ring is fixed to the top surface of the cylinder sleeve, the top end of the flame barrier ring abuts against the bottom surface of the cylinder head, and the flame barrier ring has elastic deformation at least partially along the axial direction.

[0007] The flame barrier ring comprises an assembly ring, a thermal engine ring and an explosion pressure ring, and at least one of the assembly ring, the thermal engine ring and the explosion pressure ring abuts against the bottom surface of the cylinder head during the deformation process of the bottom surface of the cylinder head.

[0008] The assembly ring, the thermal engine ring and the explosion pressure ring are each provided with a sealing section abutting against the cylinder head and a buffer section located between the sealing section and the cylinder sleeve, and the width of each buffer section is greater than the width of the corresponding sealing section, so that gaps are formed between the sealing sections.

[0009] The flame barrier ring is provided with a gas passage communicating with the outside, and the gas flows along the gas passage to the inside or outside of the flame barrier ring.

[0010] The buffer segments are provided with gas passage gaps therebetween, and each buffer segment is provided with a through hole in the circumferential direction, and adjacent through holes communicate with adjacent gas passage gaps, so that the flame barrier ring forms the gas passage communicating with the inside and outside.

[0011] The blast pressure ring, the thermal ring and the assembly ring are arranged in sequence from the inside to the outside of the center axis of the flame barrier ring.

[0012] A flame barrier method applied to the flame barrier ring, comprising the following steps of designing the top surface profile of the flame barrier ring:

[0013] Step one: simulating the circumferential deformation of the contact area between the cylinder head bottom surface and the flame barrier ring under three working conditions of engine assembly, engine applying heat load and high pressure in the engine combustion chamber;

[0014] Step two: designing the top surface profile of the assembly ring, the thermal ring and the blast pressure ring according to the circumferential deformation under the three working conditions in step one, wherein the assembly ring is adapted to the circumferential deformation of the cylinder head bottom surface under the engine assembly condition, the thermal ring is adapted to the circumferential deformation of the cylinder head bottom surface under the engine applying heat load condition, and the blast pressure ring is adapted to the circumferential deformation of the cylinder head bottom surface under the high pressure in the engine combustion chamber condition.

[0015] The cylinder head comprises a first deformation state when the engine is not running, a second deformation state when the engine is running stably and a third deformation state when the engine is in the burst pressure condition, in the first deformation state, the assembly ring abuts against the bottom surface of the cylinder head, in the second deformation state, the thermal ring abuts against the bottom surface of the cylinder head, and in the third deformation state, the blast pressure ring abuts against the bottom surface of the cylinder head.

[0016] An engine comprising a cylinder sleeve, the top part of the cylinder sleeve is provided with an assembly groove, and the assembly groove is provided with the flame barrier ring.

[0017] The top part of the cylinder sleeve is concave to form the assembly groove, and the bottom part of the flame barrier ring is provided with a mounting pad fixed in the assembly groove.

[0018] Due to the adoption of the above technical solutions, the application has the following beneficial effects:

[0019] (1) This solution sets a flame arrester ring instead of a flame arrester stand. The flame arrester ring is set as a separate component between the cylinder liner and the cylinder head. On the one hand, the bottom of the flame arrester ring is fixed to the cylinder liner, and the top abuts the bottom surface of the cylinder head. Compared with the setting structure of the flame arrester stand, there is no gap between the flame arrester ring and the bottom surface of the cylinder head, which can better assist the cylinder head gasket to achieve sealing between the cylinder head and the cylinder liner; on the other hand, the flame arrester ring is located on the inner side of the cylinder head gasket. When the engine is in explosive pressure working condition or detonation, it plays a blocking and weakening role in the axial and radial directions of the high-temperature and high-pressure explosion gas generated in the combustion chamber, thereby avoiding the impact of the high-temperature and high-pressure explosion gas on the cylinder head gasket, protecting the cylinder head gasket and achieving a stable sealing effect.

[0020] In addition, since the flame arrester ring is located between the cylinder liner and the cylinder head, and at least part of the flame arrester ring has elastic deformation in the vertical direction, when the engine is in an explosive pressure condition or detonation, the elastic deformation of the flame arrester ring prevents the top of the cylinder liner from being deformed by high temperature and impacting the cylinder head, thereby avoiding collision damage between the cylinder liner and the cylinder head. During installation, the elastic deformation of the flame arrester ring causes itself to be compressed by the axial force from the cylinder head, thereby avoiding the transmission of excessive pressure to the cylinder liner and causing damage, thereby protecting the cylinder liner.

[0021] (2) Under different working conditions of the engine, the bottom surface of the cylinder head will deform to different degrees and in different directions, resulting in changes in the gap between the cylinder head and the cylinder liner. The flame arrester ring is provided in three forms: an assembly ring, a thermal engine ring and an explosion pressure ring. The bottom surface of the cylinder head under different working conditions can be abutted against the flame arrester ring. When the bottom surface of the cylinder head undergoes different deformations under different working conditions, the flame arrester ring can be matched and abutted with it, thereby achieving sealing between the cylinder head and the cylinder liner under different working conditions, effectively preventing high-temperature and high-pressure gas from impacting the cylinder head gasket, and assisting the cylinder head gasket to achieve a good sealing effect.

[0022] (3) This solution achieves the abutment between the top surface of the flame arrester ring and the bottom surface of the cylinder head by providing a sealing section. By providing a buffer section, the buffer section serves as the elastic deformation part of the flame arrester ring. On the one hand, when the flame arrester ring is fixed to the cylinder liner, the buffer section produces a small compression deformation, thereby preventing the transmission of large pressure to the inner side of the cylinder liner and causing damage to the cylinder liner. On the other hand, during the engine explosion pressure condition or detonation, the buffer section is compressed and deformed, thereby preventing collision damage between the cylinder liner and the cylinder head. The width of the buffer section is set to be larger than the width of the corresponding sealing section, thereby forming a gap between adjacent sealing sections, providing a certain abutment deformation space for the sealing section.

[0023] (4) This solution balances the internal and external air pressures of the flame arrester ring by setting up an air passage to further ensure the stable sealing effect of the flame arrester ring.

[0024] (5) By setting the over-gas gap between the buffer sections, the gas flow path is formed inside the flame-retaining ring, the through hole is set staggeredly in the buffer pad, the gas flow paths are communicated through the through hole, the staggered through hole makes the gas flow in the flame-retaining ring, the impact force of the high-temperature and high-pressure gas is weakened, the pressure of the high-temperature and high-pressure gas is reduced after passing through the flame-retaining ring, and thus the impact of the high-pressure gas in the combustion chamber on the cylinder head gasket outside the flame-retaining ring is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0025] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The illustrative embodiments of the present application and their description serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0026] Figure 1 It is a structural schematic diagram of the flame-retaining ring in an embodiment of the present application;

[0027] Figure 2 It is an assembly sectional view of the flame-retaining ring in an embodiment of the present application;

[0028] Figure 3 It is a structural schematic diagram of the flame-retaining ring in another embodiment of the present application;

[0029] Figure 4 It is a sectional view schematic diagram of the through hole in an embodiment of the present application;

[0030] Figure 5 It is a simulation data diagram of the lofting design in an embodiment of the present application.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 1-cylinder liner, 11-assembly groove, 2-flame-retaining ring, 21-assembly ring, 22-thermal ring, 23-explosion pressure ring, 24-sealing section, 25-through hole, 26-mounting pad, 27-buffer section, 3-cylinder head, 4-cylinder head gasket. DETAILED DESCRIPTION

[0033] In order to more clearly explain the overall concept of the present application, the following will be described in detail in an exemplary manner with reference to the drawings.

[0034] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and therefore the scope of protection of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features in each embodiment can be combined with each other without conflict.

[0035] In addition, in the description of the present application, it needs to be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0036] In the present application, unless specifically defined and limited otherwise, the terms "mount", "connect", "connect", "fix", and the like should be broadly understood, for example, can be fixed connection, or detachable connection, or integrated; can be mechanical connection, or electrical connection, or communication; can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0037] In the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0038] The present application provides a flame blocking structure, as shown in Figures 1 to 5 The present application provides a flame blocking structure, as shown in

[0039] The present scheme sets a flame barrier ring 2 instead of a flame barrier platform. The flame barrier ring 2 is arranged between the cylinder liner 1 and the cylinder cover 3 as a separate component. On the one hand, the bottom of the flame barrier ring 2 is fixed to the cylinder liner 1, and the top abuts the bottom surface of the cylinder cover 3. Compared with the setting structure of the flame barrier platform, there is no gap between the flame barrier ring 2 and the bottom surface of the cylinder cover 3, which can better assist the cylinder cover gasket 4 to realize the sealing between the cylinder cover 3 and the cylinder liner 1. On the other hand, the flame barrier ring 2 is located inside the cylinder cover gasket 4. When the engine is in the explosion pressure working condition or explosion, the high-temperature and high-pressure explosion gas generated in the combustion chamber plays a blocking and weakening role in the axial and radial directions, thereby avoiding the impact of the generated high-temperature and high-pressure explosion gas on the cylinder cover gasket 4, protecting the cylinder cover gasket 4 and realizing the stable sealing effect.

[0040] In addition, since the flame barrier ring 2 is located between the cylinder liner 1 and the cylinder cover 3, and the flame barrier ring 2 at least partially has elastic deformation in the vertical direction, when the engine is in the explosion pressure working condition or explosion, the elastic deformation of the flame barrier ring 2 avoids the impact of the high-temperature deformation of the top of the cylinder liner 1 on the cylinder cover 3, avoids the collision damage between the cylinder liner 1 and the cylinder cover 3, and the elastic deformation of the flame barrier ring 2 is compressed when installed to bear the axial force from the cylinder cover 3, avoiding the transmission of excessive pressure to the cylinder liner 1 and causing damage, thereby protecting the cylinder liner 1 and buffering the cylinder liner 1 and the cylinder cover 3.

[0041] In a preferred embodiment, as shown in Figures 1 to 4 The flame barrier ring 2 includes an assembly ring 21, a thermal ring 22 and an explosion ring 23, and at least one of the assembly ring 21, the thermal ring 22 and the explosion ring 23 abuts the bottom surface of the cylinder cover 3 during the deformation of the bottom surface of the cylinder cover 3.

[0042] Under different working conditions of the engine, the bottom surface of the cylinder cover 3 will deform in different degrees and directions, causing the gap between the cylinder cover 3 and the cylinder liner 1 to change. The flame barrier ring 2 is provided with three forms of assembly ring 21, thermal ring 22 and explosion ring 23, so that the bottom surface of the cylinder cover 3 under different working conditions can abut against the flame barrier ring 2, and the flame barrier ring 2 can abut against the bottom surface of the cylinder cover 3 when the bottom surface of the cylinder cover 3 deforms in different ways under different working conditions. Therefore, the sealing between the cylinder cover 3 and the cylinder liner 1 can be realized under different working conditions, the high-temperature and high-pressure gas impact on the cylinder cover gasket 4 can be effectively avoided, and the cylinder cover gasket 4 can realize good sealing effect.

[0043] Further, as shown in Figure 3 The assembly ring 21, the thermal ring 22 and the explosion ring 23 are each provided with a sealing section 24 abutting against the cylinder cover 3 and a buffer section 27 located between the sealing section 24 and the cylinder liner 1. The width of each buffer section 27 is greater than the width of the corresponding sealing section 24, so that gaps are formed between the sealing sections 24.

[0044] The abutment between the top surface of the flame barrier ring 2 and the bottom surface of the cylinder cover 3 is achieved by setting the sealing section 24, and the buffer section 27 is set as the elastic deformation part of the flame barrier ring 2. On the one hand, when the flame barrier ring 2 is fixed to the cylinder sleeve 1, the buffer section 27 is compressed and deformed to bear the axial force from the cylinder cover 3, thereby avoiding the transmission of excessive pressure to the cylinder sleeve 1 and causing damage. On the other hand, when the engine is under the explosion pressure condition or explosion, the buffer section 27 is deformed under pressure to avoid collision damage between the cylinder sleeve 1 and the cylinder cover 3. The width of the buffer section 27 is greater than the width of the corresponding sealing section 24, so that a gap is formed between the adjacent sealing sections 24 to provide a certain abutment deformation space for the sealing section 24.

[0045] In one embodiment, the flame barrier ring 2 is provided with a gas passage communicating with the outside, and the gas flow passes through the gas passage to the inside or outside of the flame barrier ring 2. By setting the gas passage, the internal and external air pressures of the flame barrier ring 2 are balanced to further ensure the stable sealing effect of the flame barrier ring 2.

[0046] As a preferred embodiment of this embodiment, as shown in Figure 3 、 Figure 4 Each buffer section 27 is provided with a gas passage gap, and each buffer section 27 is provided with a through hole 25 in the circumferential direction, and the adjacent through holes 25 communicate with the adjacent gas passage gaps, so that the flame barrier ring 2 forms a gas passage communicating with the inside and outside.

[0047] By setting the gas passage gap between the buffer sections 27, a gas flow passage is formed inside the flame barrier ring 2, and the through hole 25 is arranged in the buffer pad, and the through hole 25 communicates each gas flow passage, and the staggered through hole 25 makes the gas flow in the flame barrier ring 2 in a detour, reduces the impact force of the high temperature and high pressure gas, and reduces the gas pressure after the high temperature and high pressure gas passes through the flame barrier ring 2, thereby avoiding the impact of the high pressure gas in the combustion chamber on the cylinder cover gasket 4 outside the flame barrier ring 2.

[0048] Preferably, the explosion pressure ring 23, the thermal machine ring 22 and the assembly ring 21 are arranged from the center axis of the flame barrier ring 2 to the outside in sequence.

[0049] The explosion pressure ring 23 is arranged at the innermost side, and the innermost side of the flame barrier ring 2 realizes the close cooperation with the cylinder cover 3 under the explosion pressure condition of the engine, and the thermal machine ring 22 and the assembly ring 21 located outside the explosion pressure ring 23 are not in close cooperation with the cylinder cover 3, but still abut with the cylinder cover 3 locally, further realizing the blocking effect of the high temperature and high pressure gas, and increasing two blocking lines of the high temperature and high pressure gas outside the explosion pressure ring 23, which is beneficial to improve the protection effect of the cylinder cover gasket 4.

[0050] A flame barrier method is applied to the flame barrier ring 2 as above, comprising the following steps:

[0051] Step one: simulate the circumferential deformation of the contact area between the bottom surface of the cylinder head 3 and the flame barrier ring 2 under three working conditions of engine assembly, engine applying heat load and high pressure in the engine combustion chamber;

[0052] Step two: design the top surface profile of the assembly ring 21, the heat ring 22 and the explosion pressure ring 23 according to the circumferential deformation under the three working conditions in step one, wherein the assembly ring 21 corresponds to the circumferential deformation of the bottom surface of the cylinder head 3 under the engine assembly working condition, the heat ring 22 corresponds to the circumferential deformation of the bottom surface of the cylinder head 3 under the engine applying heat load working condition, and the explosion pressure ring 23 corresponds to the circumferential deformation of the bottom surface of the cylinder head 3 under the high pressure in the engine combustion chamber working condition.

[0053] As shown in Figure 5 The horizontal coordinate is the circumferential angle corresponding position, and the vertical coordinate is the deformation variable. The circumferential deformation variable under the three working conditions is obtained by simulation, and the profile of the flame barrier ring 2 is designed according to the circumferential deformation variable.

[0054] According to this method, the top surfaces of the three layers of the flame barrier ring 2 are designed with different profiles. The profiles are designed according to the circumferential deformation of the contact area between the bottom surface of the cylinder head 3 and the layers of the flame barrier ring 2 under the assembly working condition, the heat load applying working condition (i.e. the heat engine working condition) and the high pressure in the engine combustion chamber working condition (i.e. the explosion pressure working condition), so as to realize the close fit of the flame barrier ring 2 and the bottom surface of the cylinder head 3 under different working conditions.

[0055] Further, the cylinder head 3 includes a first deformation state when the engine is not running, a second deformation state when the engine is running stably, and a third deformation state when the engine is under the explosion pressure working condition. In the first deformation state, the assembly ring 21 is in abutment with the bottom surface of the cylinder head 3, in the second deformation state, the heat ring 22 is in abutment with the bottom surface of the cylinder head 3, and in the third deformation state, the explosion pressure ring 23 is in abutment with the bottom surface of the cylinder head 3.

[0056] Specifically, when the engine is assembled, the elastic structure at the bottom end of the flame barrier ring 2 is fixed on the top surface of the cylinder liner 1, and the part with elastic deformation is slightly compressed to avoid transmitting large pressure to the inside of the cylinder liner 1. After the engine is assembled, the top surface of the assembly ring 21 located at the outermost side of the flame barrier ring 2 is in contact with the bottom surface of the cylinder head 3. Through the preliminary deformation of the top surface profile of the assembly ring 21 and the bottom surface of the cylinder head 3, the close fit of the two is realized, and the initial sealing state is achieved.

[0057] As the engine runs, the engine operating temperature gradually rises and tends to be stable, the deformation of the bottom surface of the cylinder head 3 changes, and it separates from the assembly ring 21 and realizes close fit with the heat ring 22, thereby re-achieving a new sealing state.

[0058] During engine explosion conditions, cylinder head 3 is impacted by the high-pressure gases within the combustion chamber, causing it to deform upward. The bottom surface of cylinder head 3 partially engages with heat ring 22, but separates in other areas, achieving a tight fit with explosion ring 23 and achieving a new sealing state under explosion conditions. This sealing state cycles repeatedly during engine operation, maintaining an effective seal with cylinder head 3 under various operating conditions and assisting cylinder head gasket 4 in sealing the gases within the combustion chamber.

[0059] The three-layer flame-blocking ring 2 is designed with different profiles, which can block the passage of high-temperature and high-pressure combustion gases in the combustion chamber, block the contact between high-temperature and high-pressure combustion gases and the cylinder head gasket 4, avoid the impact of high-pressure combustion gases on the cylinder head gasket 4, and avoid the heat load of high-temperature combustion gases being transferred to the cylinder head gasket 4 to cause damage such as ablation, thereby improving the sealing reliability of the cylinder head gasket 4.

[0060] An engine, such as Figure 2 As shown, it includes a cylinder liner 1, a mounting groove 11 is provided on the top of the cylinder liner 1, and the flame-blocking ring 2 as described above is provided in the mounting groove 11.

[0061] The buffer section 27 at the bottom end of the flame arrester ring 2 is secured within the assembly groove 11 defined in the top surface of the cylinder liner 1. During securement, the buffer section 27 undergoes slight compression deformation, preventing the transmission of significant pressure to the interior of the cylinder liner 1. Securing the flame arrester ring 2 via the assembly groove 11 provides circumferential protection for the flame arrester ring 2, reduces airflow into the flame arrester ring 2, mitigates the impact and heat loss of high-temperature, high-pressure gas on the flame arrester ring 2, and ultimately protects the flame arrester ring 2 for long-term, effective flame blocking.

[0062] Furthermore, the top of the cylinder liner 1 is recessed to form an assembly groove 11, and a mounting pad 26 is provided at the bottom of the flame arrester ring 2, fixed to the assembly groove 11. The mounting pad 26 centrally secures the bottoms of the assembly ring 21, the heat engine ring 22, and the explosion pressure ring 23, facilitating the fixed installation of the flame arrester ring 2 and contributing to the overall stability of the flame arrester ring 2. It also disperses the force on the bottom of the flame arrester ring 2 and provides a certain degree of protection for the assembly ring 21, the heat engine ring 22, and the explosion pressure ring 23, preventing wear and tear on their bottoms, thereby facilitating the long-term stability of the flame arrester ring 2.

[0063] Anything not described in this application can be achieved by adopting or drawing on existing technologies.

[0064] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0065] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included within the scope of the claims of the present application.

Claims

1. A flame barrier structure, characterized by, The application relates to a flame barrier ring (2) which comprises a cylinder liner (1), a cylinder cover (3), a cylinder cover gasket (4) and the flame barrier ring (2), the cylinder cover gasket (4) being arranged between the cylinder liner (1) and the cylinder cover (3), the flame barrier ring (2) being arranged between a combustion chamber and the cylinder cover gasket (4), the bottom end of the flame barrier ring (2) being fixed to the top surface of the cylinder liner (1), the top end of the flame barrier ring (2) abutting the bottom surface of the cylinder cover (3), and the flame barrier ring (2) being elastically deformed at least partially in the axial direction. The flame barrier ring (2) comprises an assembly ring (21), a thermal ring (22) and an explosion ring (23), and at least one of the assembly ring (21), the thermal ring (22) and the explosion ring (23) abuts the bottom surface of the cylinder cover (3) during the deformation of the bottom surface of the cylinder cover (3). The assembly ring (21), the thermal ring (22) and the explosion ring (23) are each provided with a sealing section (24) abutting the cylinder cover (3) and a buffer section (27) between the sealing section (24) and the cylinder liner (1), and the width of each buffer section (27) is greater than the width of the corresponding sealing section (24), so that gaps are formed between the sealing sections (24).

2. The flame-blocking structure according to claim 1, characterized by, The flame barrier ring (2) is provided with a gas passage which is in communication with the outside, and gas flows through the gas passage to the inside or outside of the flame barrier ring (2).

3. The flame-damping structure of claim 2, wherein The buffer sections (27) are provided with through holes (25) which are arranged in a circumferential direction and are offset from each other, and adjacent through holes (25) are in communication with adjacent gas passage gaps, so that the flame barrier ring (2) forms the gas passage which is in communication with the inside and outside.

4. The flame-dam structure of claim 1, wherein The explosion ring (23), the thermal ring (22) and the assembly ring (21) are arranged in the flame barrier ring (2) from the inside to the outside along the central axis of the flame barrier ring (2).

5. A method of flame blocking, characterized by The application is applied to the flame barrier ring (2) and comprises the following steps of designing the top surface profile of the flame barrier ring (2). Step one: simulating the circumferential deformation of the contact area between the bottom surface of the cylinder cover (3) and the flame barrier ring (2) under three working conditions of engine assembly, engine heat load and high pressure in the engine combustion chamber; Step two: designing the top surface profile of the assembly ring (21), the thermal ring (22) and the explosion ring (23) according to the circumferential deformation under the three working conditions in step one, wherein the assembly ring (21) is adapted to the circumferential deformation of the bottom surface of the cylinder cover (3) under the engine assembly condition, the thermal ring (22) is adapted to the circumferential deformation of the bottom surface of the cylinder cover (3) under the engine heat load condition, and the explosion ring (23) is adapted to the circumferential deformation of the bottom surface of the cylinder cover (3) under the high pressure in the engine combustion chamber condition.

6. The method of claim 5, wherein, The cylinder cover (3) comprises a first deformation state when the engine is not running, a second deformation state when the engine is running stably, and a third deformation state when the engine is in a burst pressure working condition, in the first deformation state, the assembly ring (21) abuts against the bottom surface of the cylinder cover (3), in the second deformation state, the thermal engine ring (22) abuts against the bottom surface of the cylinder cover (3), in the third deformation state, the burst pressure ring (23) abuts against the bottom surface of the cylinder cover (3).

7. An engine characterized by, The cylinder cover (3) comprises a first deformation state when the engine is not running, a second deformation state when the engine is running stably, and a third deformation state when the engine is in a burst pressure working condition, in the first deformation state, the assembly ring (21) abuts against the bottom surface of the cylinder cover (3), in the second deformation state, the thermal engine ring (22) abuts against the bottom surface of the cylinder cover (3), in the third deformation state, the burst pressure ring (23) abuts against the bottom surface of the cylinder cover (3).

8. The engine of claim 7, wherein The cylinder cover (3) comprises a first deformation state when the engine is not running, a second deformation state when the engine is running stably, and a third deformation state when the engine is in a burst pressure working condition, in the first deformation state, the assembly ring (21) abuts against the bottom surface of the cylinder cover (3), in the second deformation state, the thermal engine ring (22) abuts against the bottom surface of the cylinder cover (3), in the third deformation state, the burst pressure ring (23) abuts against the bottom surface of the cylinder cover (3).

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