Flame blocking structure, flame blocking method and engine

Abstract

The flame blocking structure comprises an air cylinder sleeve, an air cylinder cover, an air cylinder cover gasket and a flame blocking ring, the air cylinder cover gasket is located between the air cylinder sleeve and the air cylinder cover, the flame blocking ring is located between a combustion chamber and the air cylinder cover gasket, the bottom end of the flame blocking ring is fixed to the top face of the air cylinder sleeve, and the top end of the flame blocking ring abuts against the bottom face of the air cylinder cover. At least part of the flame blocking ring has elastic deformation in the axial direction. The flame blocking ring is arranged between the air cylinder sleeve and the air cylinder cover as an independent component and can better assist the air cylinder cover gasket to achieve sealing between the air cylinder cover and the air cylinder sleeve. When the engine is under the detonation pressure working condition or detonation, high-temperature and high-pressure detonation gas generated in a combustion chamber is blocked and weakened in the axial direction and the radial direction, so that impact on a cylinder cover gasket is avoided, and the stable sealing effect of the cylinder cover gasket is achieved. In addition, axial force borne by the flame blocking ring from the air cylinder cover is compressed through elastic deformation of the flame blocking ring, damage caused by too large pressure transmitted to the air cylinder sleeve is avoided, and the air cylinder sleeve is protected.

Description

Technical Field

[0001] The present application belongs to the field of engine flame blocking structures, and specifically relates to a flame blocking structure, a flame blocking method and an engine. Background Art

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

[0003] In the prior art, a flame damper is usually formed by a protrusion on the top of the cylinder liner to reduce the pulse impact and temperature increase of the high-temperature and high-pressure combustion gas on the cylinder head gasket. However, there is a gap between the existing flame damper and the cylinder head. When the engine is in explosion pressure condition or detonation, the impact of high-temperature and high-pressure combustion gas is generated in the combustion chamber, so that the engine detonation pressure will directly impact the cylinder head gasket through the gap between the flame damper and the cylinder head, which will not only cause the cylinder head gasket to deform or burn due to impact, and fail to achieve a good sealing effect of the cylinder head gasket, but also the flame damper of the cylinder liner deformed due to high temperature may collide with the cylinder head, causing the cylinder liner to break, affecting the stability of the engine operation. Summary of the invention

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

[0005] The technical solution adopted in this application is:

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

[0007] The flame-blocking ring comprises an assembly ring, a heat-engine ring and a burst ring, and during the deformation of the bottom surface of the cylinder head, at least one of the assembly ring, the heat-engine ring and the burst ring abuts against the bottom surface of the cylinder head.

[0008] The assembly ring, the heat engine ring and the explosion ring are all provided with a sealing section abutting the cylinder head and a buffer section between the sealing section and the cylinder liner, and the width of each buffer section is greater than the width of the corresponding sealing section so that a gap is formed between each sealing section.

[0009] The flame-blocking ring is provided with an air passage communicating with the outside, and the air flow flows along the air passage to the inside or outside of the flame-blocking ring.

[0010] A gas gap is provided between each of the buffer sections, and each of the buffer sections is provided with through holes staggered along the circumferential direction, and adjacent through holes are connected to adjacent gas gaps, so that the flame retaining ring forms the gas passage communicating inside and outside.

[0011] The explosion pressure ring, the heat engine ring and the assembly ring are arranged in sequence from the inside to the outside starting from the central axis of the flame-blocking ring.

[0012] A flame blocking method, applied to the flame blocking ring as described above, comprises: designing a top surface profile of the flame blocking ring, specifically comprising the following steps:

[0013] Step 1: simulating the circumferential deformation of the contact area between the bottom surface of the cylinder head and the flame stop ring corresponding to each cylinder under three working conditions: engine assembly, engine thermal load and high pressure in the engine combustion chamber;

[0014] Step 2: According to the circumferential deformation under the three working conditions in the step 1, the top surface profiles of the assembly ring, the thermal engine ring and the explosion ring are respectively designed, wherein the assembly ring corresponds to the circumferential deformation of the bottom surface of the cylinder head under the engine assembly condition, the thermal engine ring corresponds to the circumferential deformation of the bottom surface of the cylinder head under the condition of thermal load applied by the engine, and the explosion ring corresponds to the circumferential deformation of the bottom surface of the cylinder head under the high pressure condition in the combustion chamber of the engine.

[0015] The cylinder head 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 explosion pressure conditions. In the first deformation state, the assembly ring abuts against the bottom surface of the cylinder head, in the second deformation state, the heat engine ring abuts against the bottom surface of the cylinder head, and in the third deformation state, the explosion pressure ring abuts against the bottom surface of the cylinder head.

[0016] An engine comprises a cylinder liner, wherein a mounting groove is arranged on the top of the cylinder liner, and the flame blocking ring as described above is arranged in the mounting groove.

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

[0018] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0019] (1) In this scheme, a flame arrester ring is provided instead of a flame arrester stand. The flame arrester ring is provided 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 of the flame arrester stand abuts against the bottom surface of the cylinder head. Compared with the arrangement 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 the 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 the explosion pressure condition or detonation, the flame arrester ring has a blocking and weakening effect on the high-temperature and high-pressure explosion gas generated in the combustion chamber in both the axial and radial directions, thereby avoiding the impact of the high-temperature and high-pressure explosion gas on the cylinder head gasket, protecting the cylinder head gasket so that it can achieve 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 preventing 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 preventing excessive pressure from being transmitted 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, so that 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 setting a sealing section. By setting 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 to avoid transmitting a large pressure to the inner side of the cylinder liner to cause damage to the cylinder liner. On the other hand, when the engine is in explosive pressure or detonation condition, it is deformed under pressure to avoid 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, so that a gap is formed 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-blocking ring by setting up an air passage, so as to further ensure the stable sealing effect of the flame-blocking ring.

[0024] (5) An air gap is provided between the buffer sections to form an air flow passage inside the flame stop ring. Through holes are provided in a staggered manner on the buffer pad to connect the various air flow passages. The staggered through holes allow the gas to flow in a circuitous manner inside the flame stop ring, thereby reducing the impact force of the high-temperature and high-pressure gas. After the high-temperature and high-pressure gas passes through the flame stop ring, the gas pressure is reduced, thereby preventing the high-pressure gas in the combustion chamber from impacting the cylinder head gasket outside the flame stop ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used 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 schematic diagram of the structure of a flame baffle ring in one embodiment of the present invention;

[0027] Figure 2 It is an assembly cross-sectional view of a flame baffle ring in one embodiment of the present invention;

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

[0029] Figure 4 A schematic cross-sectional view of a through hole in one embodiment of the present invention;

[0030] Figure 5 This is a simulation data diagram of the mold line design in one embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1-cylinder liner, 11-assembly groove, 2-flame baffle ring, 21-assembly ring, 22-heat engine 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 illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope 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 may be combined with each other without conflict.

[0035] In addition, in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying 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 specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to 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 this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0038] The present application provides a flame blocking structure, such as Figures 1 to 5 As shown, it includes a cylinder liner 1, a cylinder head 3, a cylinder head gasket 4 and a flame stop ring 2. The cylinder head gasket 4 is located between the cylinder liner 1 and the cylinder head 3, and the flame stop ring 2 is located between the combustion chamber and the cylinder head gasket 4. The bottom end of the flame stop ring 2 is fixed to the top surface of the cylinder liner 1, and the top end of the flame stop ring 2 abuts against the bottom surface of the cylinder head 3. The flame stop ring 2 has elastic deformation at least partially along the axial direction.

[0039] In this solution, a flame baffle ring 2 is provided to replace the flame baffle table. The flame baffle ring 2 is provided as a separate component between the cylinder liner 1 and the cylinder head 3. On the one hand, the bottom of the flame baffle ring 2 is fixed to the cylinder liner 1, and the top abuts against the bottom surface of the cylinder head 3. Compared with the setting structure of the flame baffle table, there is no gap between the flame baffle ring 2 and the bottom surface of the cylinder head 3, which can better assist the cylinder head gasket 4 to achieve the sealing between the cylinder head 3 and the cylinder liner 1; on the other hand, the flame baffle ring 2 is located on the inner side of the cylinder head gasket 4. When the engine is in an explosive pressure condition or detonation, the flame baffle ring 2 has a blocking and weakening effect on the high-temperature and high-pressure explosion gas generated in the combustion chamber in both the axial and radial directions, thereby avoiding the impact of the high-temperature and high-pressure explosion gas on the cylinder head gasket 4, protecting the cylinder head gasket 4 so that it can achieve a stable sealing effect.

[0040] In addition, since the flame stop ring 2 is located between the cylinder liner 1 and the cylinder head 3, and the flame stop ring 2 has elastic deformation in the vertical direction at least in part, when the engine is in an explosive pressure condition or detonation, the elastic deformation of the flame stop ring 2 prevents the top of the cylinder liner 1 from being deformed by high temperature and impacting the cylinder head 3, thereby preventing collision damage between the cylinder liner 1 and the cylinder head 3. Moreover, the elastic deformation of the flame stop ring 2 causes itself to be compressed by the axial force from the cylinder head 3 during installation, thereby preventing excessive pressure from being transmitted to the cylinder liner 1 and causing damage, thereby protecting the cylinder liner 1 and providing buffer protection for the cylinder liner 1 and the cylinder head 3.

[0041] In a preferred embodiment, Figures 1 to 4 As shown, the flame-blocking ring 2 includes an assembly ring 21 , a heat engine ring 22 and a burst ring 23 , and during the deformation of the bottom surface of the cylinder head 3 , at least one of the assembly ring 21 , the heat engine ring 22 and the burst ring 23 abuts against the bottom surface of the cylinder head 3 .

[0042] Under different working conditions of the engine, the bottom surface of the cylinder head 3 will deform to different degrees and in different directions, resulting in changes in the gap between the cylinder head 3 and the cylinder liner 1. The flame stop ring 2 is provided with three forms of an assembly ring 21, a thermal engine ring 22 and an explosion pressure ring 23, so that the bottom surface of the cylinder head 3 under different working conditions can be abutted with the flame stop ring 2, so that when the bottom surface of the cylinder head 3 undergoes different deformations under different working conditions, the flame stop ring 2 can be matched and abutted therewith, thereby achieving sealing between the cylinder head 3 and the cylinder liner 1 under different working conditions, effectively preventing high-temperature and high-pressure gases from impacting the cylinder head gasket 4, and assisting the cylinder head gasket 4 to achieve a good sealing effect.

[0043] Furthermore, if Figure 3 As shown, the assembly ring 21, the heat engine ring 22 and the explosion pressure ring 23 are all provided with a sealing section 24 abutting against the cylinder head 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 a gap is formed between each sealing section 24.

[0044] The top surface of the flame arrester ring 2 and the bottom surface of the cylinder head 3 are abutted by providing the sealing section 24. The buffer section 27 is provided as the elastic deformation part of the flame arrester ring 2. On the one hand, when the flame arrester ring 2 is fixed to the cylinder liner 1, the buffer section 27 is compressed and deformed to bear the axial force from the cylinder head 3, thereby avoiding the transmission of excessive pressure to the cylinder liner 1 and causing damage. On the other hand, when the engine is in explosive pressure or detonation condition, it is deformed under pressure to avoid collision damage between the cylinder liner 1 and the cylinder head 3. The width of the buffer section 27 is set to be greater than the width of the corresponding sealing section 24, so that a gap is formed between adjacent sealing sections 24, providing a certain abutment deformation space for the sealing section 24.

[0045] In one embodiment, the flame arresting ring 2 is provided with an air passage connected to the outside, and the air flows along the air passage to the inside or outside of the flame arresting ring 2. By providing the air passage, the internal and external air pressures of the flame arresting ring 2 are balanced to further ensure the stable sealing effect of the flame arresting ring 2.

[0046] As a preferred implementation of this embodiment, Figure 3 , Figure 4 As shown, a gas gap is provided between each buffer segment 27, and each buffer segment 27 is provided with a through hole 25 staggered along the circumferential direction, and adjacent through holes 25 are connected to adjacent gas gaps, so that the flame retaining ring 2 forms a gas passage communicating inside and outside.

[0047] By arranging a gas gap between the buffer sections 27, an air flow passage is formed inside the flame stop ring 2, and through holes 25 are staggered in the buffer pad to connect the various air flow passages. The staggered through holes 25 allow the gas to flow in a circuitous manner inside the flame stop ring 2, thereby reducing the impact force of the high-temperature and high-pressure gas and reducing the gas pressure after the high-temperature and high-pressure gas passes through the flame stop ring 2, thereby preventing the high-pressure gas in the combustion chamber from impacting the cylinder head gasket 4 outside the flame stop ring 2.

[0048] Preferably, the explosion pressure ring 23 , the heat engine ring 22 and the assembly ring 21 are arranged in sequence from the inside to the outside on the central axis of the flame shield ring 2 .

[0049] The explosion ring 23 is arranged at the innermost side, and the innermost side of the flame-blocking ring 2 is tightly matched with the cylinder head 3 under the explosion condition of the engine. At the same time, although the heat engine ring 22 and the assembly ring 21 located on the outer side of the explosion ring 23 are not in a tightly matched state with the cylinder head 3, they are still partially in contact with the cylinder head 3, further realizing the blocking effect of high-temperature and high-pressure gas, and adding two blocking defense lines for high-temperature and high-pressure gas on the outer side of the explosion ring 23 is beneficial to improving the protection effect of the cylinder head gasket 4.

[0050] A flame blocking method, applied to the flame blocking ring 2 as above, comprises: designing a top surface profile of the flame blocking ring 2, specifically comprising the following steps:

[0051] Step 1: Simulate the circumferential deformation of the contact area between the bottom surface of the cylinder head 3 and the flame stop ring 2 of each cylinder under three working conditions: engine assembly, engine thermal load and high pressure in the engine combustion chamber;

[0052] Step 2: According to the circumferential deformation under the three working conditions in step 1, the top surface profiles of the assembly ring 21, the thermal engine ring 22 and the explosion pressure ring 23 are designed respectively, 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 thermal engine ring 22 corresponds to the circumferential deformation of the bottom surface of the cylinder head 3 under the working condition of thermal load applied by the engine, and the explosion pressure ring 23 corresponds to the circumferential deformation of the bottom surface of the cylinder head 3 under the high pressure working condition in the combustion chamber of the engine.

[0053] like Figure 5 As shown in the figure, the horizontal axis is the corresponding position of the circular angle, and the vertical axis is the deformation amount. The corresponding circumferential deformation amounts under three working conditions are obtained through simulation, and the flame baffle ring 2 profile is designed according to the circumferential deformation amount.

[0054] According to this method, different profiles are designed for the top surfaces of the three layers of the flame stop ring 2, and the profiles are designed with complementary curves according to the circumferential deformation of the bottom surface of the cylinder head 3 corresponding to each cylinder and the contact area of ​​each layer of the flame stop ring 2 under the assembly condition, the condition of applying thermal load (i.e., the thermal engine condition), and the high pressure condition in the combustion chamber (i.e., the explosion pressure condition), so as to achieve a tight fit between the flame stop ring 2 and the bottom surface of the cylinder head 3 under different working conditions.

[0055] Furthermore, 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 explosion pressure conditions. In the first deformation state, the assembly ring 21 abuts against the bottom surface of the cylinder head 3, in the second deformation state, the thermal engine ring 22 abuts against the bottom surface of the cylinder head 3, and in the third deformation state, the explosion pressure ring 23 abuts against 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 baffle ring 2 is fixed to the top surface of the cylinder liner 1, and the elastically deformable portion is subjected to a small compression deformation to avoid transmitting a large pressure to the inside of the cylinder liner 1 and causing damage. After the engine is assembled, the top surface of the outermost assembly ring 21 of the flame baffle ring 2 contacts the bottom surface of the cylinder head 3, and the top surface profile of the assembly ring 21 cooperates with the initial deformation of the bottom surface of the cylinder head 3 to achieve a close fit between the two after assembly and achieve an initial sealing state.

[0057] As the engine runs, the engine operating temperature gradually increases and tends to be stable, the bottom surface of the cylinder head 3 deforms and changes, and it separates from the assembly ring 21 and fits closely with the heat engine ring 22 to achieve a new sealing state.

[0058] When the engine is under explosion pressure condition, the cylinder head 3 is impacted by the high-pressure gas in the combustion chamber and deforms upward. The bottom surface of the cylinder head 3 partially cooperates with the heat engine ring 22, and some areas are separated, so as to achieve a close fit with the explosion pressure ring 23, and realize a new sealing state under explosion pressure condition. When the engine is working, the above sealing state reciprocates, thereby maintaining an effective seal with the cylinder head 3 under various working conditions, and assisting the cylinder head gasket 4 to seal the gas in the combustion chamber.

[0059] The three-layer flame-blocking ring 2 is designed with different profiles to block the passage of high-temperature and high-pressure combustion gases in the combustion chamber, block the contact between the high-temperature and high-pressure combustion gases and the cylinder head gasket 4, avoid the impact of the high-pressure combustion gases on the cylinder head gasket 4, and avoid the heat load of the 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 comprises a cylinder liner 1, a mounting groove 11 is arranged on the top of the cylinder liner 1, and a flame blocking ring 2 as above is arranged in the mounting groove 11.

[0061] The buffer section 27 at the bottom end of the flame arrester ring 2 is fixed in the assembly groove 11 provided on the top surface of the cylinder liner 1. The buffer section 27 generates a slight compression deformation when fixed to avoid transmitting a large pressure to the inner side of the cylinder liner 1. The flame arrester ring 2 is installed and fixed by means of the assembly groove 11, which is conducive to the circumferential protection of the flame arrester ring 2, reduces the airflow flowing to the flame arrester ring 2, reduces the impact and heat loss of the high-temperature and high-pressure gas on the flame arrester ring 2, and protects the flame arrester ring 2 to achieve a long-term and effective flame arresting effect.

[0062] Furthermore, the top of the cylinder liner 1 is concave to form an assembly groove 11, and a mounting pad 26 fixed to the assembly groove 11 is provided at the bottom of the flame arrester ring 2. The bottoms of the assembly ring 21, the heat engine ring 22 and the explosion pressure ring 23 are centrally fixed by the mounting pad 26, which is convenient for fixing and installing the flame arrester ring 2, and is beneficial to the overall stability of the flame arrester ring 2, dispersing the force on the bottom of the flame arrester ring 2, and having a certain protective effect on the assembly ring 21, the heat engine ring 22 and the explosion pressure ring 23, avoiding wear and tear on the bottom thereof, and is beneficial to achieving the long-term use 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 referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0065] The above is only 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 principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A flame barrier structure, characterized in that: The invention comprises a cylinder liner (1), a cylinder head (3), a cylinder head gasket (4) and a flame stop ring (2); the cylinder head gasket (4) is located between the cylinder liner (1) and the cylinder head (3); the flame stop ring (2) is located between the combustion chamber and the cylinder head gasket (4); the bottom end of the flame stop ring (2) is fixed to the top surface of the cylinder liner (1); the top end of the flame stop ring (2) abuts against the bottom surface of the cylinder head (3); and the flame stop ring (2) has elastic deformation at least partially along the axial direction.

2. The flame barrier structure according to claim 1, characterized in that: The flame-blocking ring (2) comprises an assembly ring (21), a heat engine ring (22) and a burst ring (23), and during the deformation of the bottom surface of the cylinder head (3), at least one of the assembly ring (21), the heat engine ring (22) and the burst ring (23) abuts against the bottom surface of the cylinder head (3).

3. The flame barrier structure according to claim 2, characterized in that: The assembly ring (21), the heat engine ring (22) and the explosion pressure ring (23) are all provided with a sealing section (24) abutting against the cylinder head (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 a gap is formed between each sealing section (24).

4. The flame barrier structure according to claim 3, characterized in that: The flame-blocking ring (2) is provided with an air passage communicating with the outside, and air flows along the air passage to the inside or outside of the flame-blocking ring (2).

5. The flame barrier structure according to claim 4, characterized in that: An air gap is provided between each of the buffer sections (27), and each of the buffer sections (27) is provided with a through hole (25) staggered along the circumferential direction, and adjacent through holes (25) are connected to adjacent air gaps, so that the flame retaining ring (2) forms an air passage that is connected inside and outside.

6. The flame barrier structure according to claim 2, characterized in that: The explosion pressure ring (23), the heat engine ring (22) and the assembly ring (21) are arranged in sequence from the inside to the outside starting from the central axis of the flame-blocking ring (2).

7. A flame blocking method, characterized in that: The flame barrier ring (2) as claimed in claim 2 comprises: designing the top surface profile of the flame barrier ring (2), specifically comprising the following steps: Step 1: simulating the circumferential deformation of the contact area between the bottom surface of the cylinder head (3) and the flame stop ring (2) corresponding to each cylinder under three working conditions: engine assembly, engine thermal load, and high pressure in the engine combustion chamber; Step 2: According to the circumferential deformation under the three working conditions in step 1, the top surface profiles of the assembly ring (21), the heat engine ring (22) and the explosion ring (23) are respectively designed, 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 engine ring (22) corresponds to the circumferential deformation of the bottom surface of the cylinder head (3) under the working condition of thermal load applied by the engine, and the explosion ring (23) corresponds to the circumferential deformation of the bottom surface of the cylinder head (3) under the high pressure working condition in the combustion chamber of the engine.

8. The flame blocking method according to claim 7, characterized in that: The cylinder head (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 under explosion pressure conditions. In the first deformation state, the assembly ring (21) abuts against the bottom surface of the cylinder head (3), in the second deformation state, the heat engine ring (22) abuts against the bottom surface of the cylinder head (3), and in the third deformation state, the explosion pressure ring (23) abuts against the bottom surface of the cylinder head (3).

9. An engine, characterized in that: It comprises a cylinder liner (1), wherein a mounting groove (11) is provided at the top of the cylinder liner (1), and a flame-blocking ring (2) as claimed in claim 1 is provided in the mounting groove (11).

10. The engine according to claim 9, characterized in that The top of the cylinder sleeve (1) is concave to form the assembly groove (11), and the bottom of the flame baffle ring (2) is provided with a mounting pad (26) fixed to the assembly groove (11).

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