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CN-121993313-A - Engine cylinder cover sealing structure based on combination of hard seal and elastic seal

CN121993313ACN 121993313 ACN121993313 ACN 121993313ACN-121993313-A

Abstract

The invention discloses an engine cylinder cover sealing structure based on a combination of hard sealing and elastic sealing, and relates to the technical field of engine sealing. The engine sealing structure has the technical key points that as the mechanical seal (main seal) formed by two sealing joint surfaces and the flexible seal (auxiliary seal) formed by the O-shaped ring made of flexible materials are adopted, the main sealing structure and the auxiliary sealing structure are formed, and a double barrier is formed between the cylinder cover and the cylinder body, so that slight leakage occurs in the main seal, and the auxiliary seal can be effectively intercepted, the technical problems that the sealing effect is unstable and single seal is easy to fail easily when the existing engine sealing structure is used are effectively solved, the effective sealing between the cylinder body and the cylinder cover is further realized, and the operation safety and the robustness of an engine are greatly improved while the sealing effect is improved.

Inventors

  • ZHANG CHANGLING

Assignees

  • 广西玉柴机器股份有限公司

Dates

Publication Date
20260508
Application Date
20260129

Claims (10)

  1. 1. An engine cylinder cover sealing structure based on a combination of hard sealing and elastic sealing is arranged between a cylinder cover (11) and a cylinder body (2) of an engine, and is characterized in that the sealing structure comprises: The first sealing component is arranged on the cylinder cover (11) and is flexible to seal, and the first sealing component is extruded and sealed through the cylinder cover (11) and the cylinder body (2); The second sealing component is arranged at the joint of the cylinder cover (11) and the cylinder body (2) and is hard-sealed, and the second sealing component is sealed by mutually attaching the cylinder cover (11) and the cylinder body (2).
  2. 2. The engine cylinder cover sealing structure based on the combination of hard sealing and elastic sealing, as claimed in claim 1, is characterized in that the first sealing component is an O-shaped ring (4) made of flexible materials and arranged on the inner wall of the cylinder cover (11), and when the cylinder body (2) is in butt joint with the cylinder cover (11), the O-shaped ring (4) is in surface joint with a butt joint pipe (13) on the cylinder body (2).
  3. 3. The engine cylinder cover sealing structure based on the combination of hard sealing and elastic sealing is characterized in that the second sealing assembly is a sealing joint surface (3) arranged on the end face of a butt joint pipe (13) and the inner wall of a cylinder cover (11), asymmetric annular lines are arranged on the sealing joint surface (3), and when the cylinder body (2) is connected with the cylinder cover (11), the asymmetric annular lines at the corresponding positions of the butt joint pipe (13) and the cylinder cover (11) are mutually attached.
  4. 4. The engine cylinder cover sealing structure based on the combination of hard sealing and elastic sealing as set forth in claim 3, further comprising: The third sealing assembly is arranged between the butt joint pipe (13) and the cylinder cover (11), is provided with two groups and is respectively arranged on the butt joint pipe (13) and the cylinder cover (11); The third sealing component comprises a hot melting medium (53) and a heating piece, the hot melting medium (53) is wrapped on the heating piece and is respectively connected with the butt joint pipe (13) and the cylinder cover (11), when the butt joint pipe (13) and the cylinder cover (11) are in butt joint, the hot melting medium (53) is heated to be melted through the heating piece, and the two groups of melted sealing components are fused.
  5. 5. The engine cylinder cover sealing structure based on the combination of hard sealing and elastic sealing as claimed in claim 4, wherein annular embedded grooves are formed in the outer wall of the butt joint pipe (13) and the inner wall of the cylinder cover (11) and are used for providing a containing space for a hot melting medium (53) and a heating element, and the two embedded grooves correspond to each other when the butt joint pipe (13) and the cylinder cover (11) are in butt joint.
  6. 6. The engine cylinder cover sealing structure based on the combination of hard sealing and elastic sealing according to claim 5, wherein inner walls of the two embedded grooves are respectively provided with lining strips (54) which are divided into an upper row and a lower row, the two rows of lining strips (54) respectively extend in opposite directions outwards, and a hot melt medium (53) is fixed through the two rows of lining strips (54).
  7. 7. The engine cylinder cover sealing structure based on the combination of hard sealing and elastic sealing as claimed in claim 4, wherein the heating element comprises annular heating wires, the heating wires are divided into two groups, one group is a first heating wire (51) arranged on the inner wall of the cylinder cover (11), the other group is a second heating wire (52) arranged on the outer wall of the butt joint pipe (13), and the hot melting medium (53) can be heated to a molten state through the heating wires.
  8. 8. The engine cylinder cover sealing structure based on the combination of hard sealing and elastic sealing as claimed in claim 7, wherein a first copper sheet (55) is embedded on the outer wall of the butt joint pipe (13), a second copper sheet (56) is embedded on the inner wall of the cylinder cover (11), and the first copper sheet (55) and the second heating wire (52) and the second copper sheet (56) and the first heating wire (51) are connected through a lead (57); When the butt joint pipe (13) is in butt joint with the cylinder cover (11), a first copper sheet (55) on the outer wall of the butt joint pipe (13) is attached to a second copper sheet (56) on the inner wall of the cylinder cover (11).
  9. 9. The engine cylinder cover sealing structure based on the combination of hard sealing and elastic sealing as claimed in claim 8, wherein one conducting strip (6) is arranged on each side of the cylinder cover (11), the conducting strips (6) are connected with the first heating wire (51) through conducting wires (57), and when the two conducting strips (6) are electrified, current can enter the first heating wire (51) and the second copper wire (56) through the conducting strips (6), and then is transmitted to the first copper sheet (55) through the second copper sheet (56), and is transmitted to the second heating wire (52) through the first copper sheet (55).
  10. 10. A method for detecting tightness of a sealing structure of an engine cylinder cover, which is used for detecting the sealing structure according to any one of claims 1 to 8, and is characterized by comprising the following steps: Step 1, fastening a cylinder cover and a cylinder body of the assembled sealing structure according to preset torque of a cylinder cover material, and then placing an assembly body in a temperature control test box for preheating and keeping constant temperature, so as to eliminate assembly stress, wherein the simulation temperature, the duration and the cooling rate of a high-temperature working condition are matched with the actual temperature change rule of an engine; Step 2, filling preset pressure detection media adapting to the characteristics of different sealing areas into the cylinder body, arranging a leakage monitoring device in each key sealing area, and constructing a multi-dimensional full-coverage differential monitoring system; Step 3, maintaining the stability of preset pressure, adapting the pressure stabilizing time length and the sampling frequency according to the pressure level of the detection medium, collecting data such as pressure, trace signals, temperature and the like in real time, removing interference signals by adopting a filtering algorithm, constructing a three-dimensional monitoring data set, and recording leakage quantity information and corresponding environmental parameters; Step 4, heating the hot-melt sealing assembly by supplying power to enable the hot-melt medium to be fully melted and filled in the sealing gap, simulating the actual high-temperature working condition of the engine in the heating process, keeping the temperature and the pressure at constant temperature, and then cooling to the normal temperature at a preset rate; Step 5, repeating the detection flow of the steps 2 to 3, wherein the secondary detection conditions are consistent, adopting a multi-physical field coupling algorithm to analyze the leakage characteristic changes of each sealing assembly before and after hot melting and solidification and after high and low temperature circulation, distinguishing different leakage types, positioning the fault sealing assembly and the specific leakage position, and simultaneously analyzing the influence rule of the working condition on the sealing performance; and 6, comprehensively judging the tightness according to the multi-dimensional tightness qualification judging index, and giving a targeted rectifying and modifying scheme aiming at the unqualified condition.

Description

Engine cylinder cover sealing structure based on combination of hard seal and elastic seal Technical Field The invention relates to the technical field of engine sealing, in particular to an engine cylinder cover sealing structure based on combination of hard sealing and elastic sealing. Background The engine is a machine capable of converting other forms of energy into mechanical energy, wherein the engine is a reciprocating piston type engine, the engine is suitable for a power generation device and can also refer to the whole machine comprising the power generation device, the engine body of the engine is a framework for forming the engine and is a mounting basis for each mechanism and each system of the engine, a sealing device of the engine is generally divided into radial sealing and axial sealing, the sealing structure is generally sealed by adopting a method of mounting an O-shaped ring in a groove, and the radial O-shaped ring and the axial O-shaped ring are separated; At present, the Chinese patent with the prior patent application number of CN202422266379.2 discloses a sealing structure used between a cylinder body and a cylinder cover of an air compressor, which comprises a cylinder body, a cylinder cover, a bolt and an O-shaped ring, wherein the lower end of the cylinder cover is inserted into a groove of the cylinder body, the cylinder cover and the cylinder body are fastened through the bolt, a chamfer A with a triangular section is arranged at an inner hole orifice of the cylinder body, the O-shaped ring is embedded on the chamfer A, the inner diameter of the O-shaped ring is smaller than the outer diameter of the lower end insertion end of the cylinder cover, and the outer diameter of the O-shaped ring extends to the outside of the orifice of the inner hole of the cylinder body; however, in the implementation process of the technical scheme, at least the following technical problems are found: The sealing effect is unstable and is easy to cause single sealing faults, in the prior art, a single cylinder gasket seal or a single O-shaped ring seal is adopted, under the extreme working conditions of high pressurization and high heat load, the single sealing structure has inherent defects, namely, once the sealing fails, serious faults such as engine power reduction, cooling liquid or engine oil pollution are directly caused, safety redundancy is lacking, especially for commercial vehicles, engineering machinery and special engines with extremely high reliability requirements, the existing sealing structure is particularly obvious, secondly, the existing sealing structure is divided into two types, firstly, the existing sealing structure is flexible sealing, namely, the sealing structure is made of flexible materials, the sealing structure is arranged between a cylinder body and a cylinder cover, deformation is caused by mutual extrusion between the sealing structure and the cylinder body, so that a gap between the cylinder body and the cylinder cover is blocked, the sealing effect is achieved, secondly, the sealing structure is a flow blocking structure is arranged at the joint of the cylinder cover and the cylinder body, the sealing effect is realized, and the sealing effect is not easy to be discharged from the gap between the cylinder body, firstly, the sealing effect is lost, the sealing structure is easy to fill the gap between the cylinder body and the cylinder cover, and the sealing structure is easy to fill the gap between the cylinder cover, and the sealing structure is not easy to complete, and the sealing effect is also flexible sealing structure is easy to fill through the gap between the cylinder body and the cylinder cover through the gap due to the sealing structure, the sealing effect of the engine cylinder cover sealing structure can be gradually deteriorated, and therefore, the engine cylinder cover sealing structure based on the combination of hard sealing and elastic sealing is provided. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides an engine cylinder cover sealing structure based on the combination of hard sealing and elastic sealing, which solves the technical problems that the sealing effect is unstable and single sealing is easy to cause faults when the existing engine sealing structure is used. (II) technical scheme In order to achieve the above purpose, the invention is realized by the following technical scheme: an engine cylinder cover sealing structure based on hard seal and elastic seal combination is arranged between a cylinder cover and a cylinder body of an engine, and the sealing structure comprises: the first sealing component is arranged on the cylinder cover and is flexible to seal, and the first sealing component is extruded by the cylinder cover and the cylinder body to seal; the second seal assembly is arranged at the joint of the cylinder cover and the cylinder body and is hard