Round-corner oil-containing groove mechanical sealing structure

Abstract

The invention belongs to the technical field of aero-engine sealing, and particularly relates to a fillet oil-containing groove mechanical sealing structure which comprises a static ring and a fillet oil-containing groove moving ring which are coaxially matched, fillet oil-containing grooves which are evenly distributed in the circumferential direction are formed in the ring face of the fillet oil-containing groove moving ring, and the outer ends of the fillet oil-containing grooves are fillets. The fillet oil containing grooves are located in the circumferential range of the contact ring face of the static ring and are evenly distributed at equal intervals. An oil-containing groove structure of a traditional mechanical sealing moving ring is improved, a sharp corner at the outer end of the oil-containing groove is changed into a large round corner, under the condition that the oil film development capacity of the round-corner oil-containing groove is guaranteed, the lubricating oil congestion phenomenon is reduced, low-pressure area distribution in a fluid area is reduced, the leakage rate of mechanical sealing is reduced, and then the sealing capacity of sealing is improved. The method has high engineering application value, and a new thought is provided for the design of a new mechanical seal structure.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation engine sealing, and in particular relates to a rounded oil-containing groove mechanical sealing structure. Background Art

[0002] As the core power system of aircraft, aircraft engines operate in extremely harsh environments, including high temperature, high pressure, high-speed rotation and vibration. Sealing technology plays a vital role in aircraft engines and is directly related to engine performance, efficiency and life. In early aircraft engines, sealing technology mainly used packing seals and labyrinth seals. Although these methods have simple structures, they are difficult to meet the demanding requirements of high speed, high temperature and high pressure due to limited sealing performance and durability.

[0003] In order to further improve sealing efficiency and reduce fuel leakage and maintenance costs, mechanical seals have begun to enter the research and development of aircraft engines. Mechanical seals, also known as end face seals, are a shaft sealing device for rotating machinery. The end face perpendicular to the rotating shaft is kept in contact and slides relatively under the action of fluid pressure and compensation mechanism, realizing the function of preventing fluid leakage. As an efficient dynamic sealing form, it has gradually become the mainstream choice for sealing key parts of aircraft engines due to its superior sealing performance.

[0004] Existing end face sealing structure such as Figure 1-3 As shown, Figure 1 This is a schematic diagram of the assembly of a traditional mechanical seal structure, in which the mechanical seal dynamic ring structure and the static ring structure are coaxially matched, and the static ring 1 is pressed against the wall of the dynamic ring 2 with an oil groove by a wave spring. The inner hole radius of the dynamic ring is R , the inner radius of the contact surface between the static ring and the dynamic ring of the mechanical seal is R 1 , the outer radius of the contact ring R 2 . Figure 2 Schematic diagram of the dynamic ring structure in a traditional mechanical seal. A series of sharp-angle oil-containing grooves 21 of equal spacing and size are evenly distributed within the circumferential range of the contact surface between the static ring and the dynamic ring, wherein the lower edge radius of the sharp-angle oil-containing groove is r 1 , the upper edge radius of the sharp-angle oil-containing groove is r 2 , the outer radius of the moving ring is r 3 The angles between the two sides of the sharp oil-containing groove and the y-axis are θ 1 and θ 2 , the distance between the lower edge and the y-axis is d 1 , the straight-line distance of the arc at its lower edge isd 2 ,in d 2 =2* d 1 . Figure 3 This is the AA cross-section of the traditional mechanical seal dynamic ring structure. The depth of the oil groove of the dynamic ring is h。 The above-mentioned sharp-angle oil-containing groove has a design defect that the oil film development in the fluid area is unstable, so that the distribution of low-pressure areas in the fluid domain cannot be reduced, resulting in poor sealing effect. Summary of the invention

[0005] In order to solve the problem of poor sealing effect of sharp-angle oil-containing grooves, the present invention provides a mechanical seal structure with rounded-angle oil-containing grooves. The oil-containing groove is designed as a rounded structure to stabilize the development of the oil film in the fluid area, reduce the distribution of low-pressure areas in the fluid domain, and thus improve the sealing ability of the seal.

[0006] The technical solution adopted by the present invention is: a mechanical seal structure with rounded oil grooves, including a coaxially matched static ring and a dynamic ring with rounded oil grooves, the annular surface of the dynamic ring with rounded oil grooves is provided with rounded oil grooves evenly distributed around the circumference, and the outer ends of the rounded oil grooves are rounded.

[0007] Furthermore, the fillet oil-containing grooves are located within the circumferential range of the contact ring surface with the stationary ring and are evenly distributed at equal distances.

[0008] Furthermore, the inner diameter of the rounded oil groove dynamic ring R The inner radius of the contact surface between the stationary ring and the rounded oil grooved dynamic ring is 60.12 mm. R 1 The outer radius of the contact ring is 73.2 mm. R 2 84.2mm; the radius of the lower edge of the rounded oil groove r 1 The upper edge radius of the fillet oil groove is 70.7 mm. r 2 The outer ring radius of the rounded oil groove dynamic ring is 77 mm. r 3 The angle between the two sides of the fillet oil groove and the y-axis is 84.3 mm. θ 1 61.8°, θ 2 is 69.2°, and the distance between the lower edge of the fillet oil groove and the y-axis d 1 1.55 mm, the arc straight line distance of the lower edge of the fillet oil groove d 2 The depth of the oil groove in the fillet is 3.1 mm. hThe fillet radius of the outer end of the fillet oil groove is 0.005 mm. Φ is 0.8 mm; the number of fillet oil grooves is 35.

[0009] Beneficial effects of the present invention: A mechanical seal structure with rounded oil groove. The traditional mechanical seal dynamic ring oil groove structure is improved by changing the outer end sharp corner of the oil groove into a large rounded corner. While ensuring its oil film development ability, the lubricating oil congestion phenomenon is reduced, the distribution of low-pressure areas in the fluid domain is reduced, and the leakage of the mechanical seal is reduced, thereby improving the sealing ability of the seal. It has high engineering application value and provides new ideas for the design of new mechanical seal structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the assembly of the dynamic and static rings of a traditional mechanical seal in the background technology; Figure 2 It is a structural schematic diagram of a traditional mechanical seal dynamic ring structure in the background technology; Figure 3 yes Figure 2 AA surface cross-section diagram; Figure 4 This is a schematic diagram of the assembly of the dynamic and static rings of a mechanical seal structure with rounded corners and oil grooves. Figure 5 It is a structural schematic diagram of the dynamic ring structure in the rounded oil groove mechanical seal structure.

[0011] In the figure, 1-static ring, 2-dynamic ring, 21-pointed oil groove, 3-rounded oil groove dynamic ring, 31-rounded oil groove. DETAILED DESCRIPTION Example

[0012] Reference Figure 4 and Figure 5 A mechanical seal structure with rounded oil grooves comprises a coaxially matched stationary ring 1 and a rotating ring 3 with rounded oil grooves. The rotating ring 3 with rounded oil grooves is provided with rounded oil grooves 31 evenly distributed around the circumference on its annular surface, and the outer ends of the rounded oil grooves 31 are rounded.

[0013] The mechanical seal dynamic ring structure with rounded oil groove is used in conjunction with the stationary ring structure, and the installation method is the same as that of the traditional mechanical seal dynamic ring structure. The basic structural parameters of the oil groove are the same as those of the traditional mechanical seal dynamic ring structure. On the basis of the traditional mechanical seal dynamic ring structure, the sharp corners of the oil groove in the dynamic and static ring joint area are changed to rounded corners. The rounded oil groove is located on the contact ring surface with the stationary ring, and the inner hole radius of the rounded oil groove dynamic ring is R The inner radius of the contact surface between the stationary ring and the rounded oil grooved dynamic ring is 60.12 mm. R 1 The outer radius of the contact ring is 73.2 mm. R2 84.2mm; the radius of the lower edge of the rounded oil groove r 1 The upper edge radius of the fillet oil groove is 70.7mm r 2 The outer ring radius of the rounded oil groove dynamic ring is 77 mm. r 3 The angle between the two sides of the fillet oil groove and the y-axis is 84.3 mm. θ 1 61.8°, θ 2 is 69.2°, and the distance between the lower edge of the fillet oil groove and the y-axis d 1 1.55mm, the arc straight line distance of the lower edge of the fillet oil groove d 2 The depth of the oil groove in the fillet is 3.1 mm. h The fillet radius of the outer end of the fillet oil groove is 0.005 mm. Φ The diameter of the rounded oil groove is 0.8 mm, and the number of rounded oil grooves is 35. The traditional mechanical seal dynamic ring structure is replaced with a rounded oil groove dynamic ring structure to stabilize the oil film development in the fluid area, reduce the distribution of low-pressure areas in the fluid domain, and thus improve the sealing ability of the seal. Example

[0014] For Example 1 and the traditional mechanical seal structure, ANSYS Fluent software was used to simulate and analyze the traditional sharp-angle oil groove mechanical seal structure and the rounded-angle oil groove mechanical seal structure. The inlet pressure was set to 111325 Pa, the outlet pressure was set to 101325 Pa, the rotor speed was set to 20900 r / min, and the current simulation temperature was set to 420 K. The following results were obtained: For the traditional mechanical seal structure, the calculated leakage volume m 1 =0.2397 g / s. For the mechanical seal structure with rounded oil groove, the calculated leakage volume m 2 =0.1358 g / s, compared with the traditional mechanical seal, the leakage is reduced by 43.35%. The traditional mechanical seal has a dynamic ring oil groove structure, and by adding a rounded structure to the oil groove in the dynamic and static ring joint area, the lubricating oil congestion phenomenon is reduced while ensuring its oil film development ability, thereby reducing the leakage of the seal. Reducing the distribution of low-pressure areas improves the sealing ability of the mechanical seal.

[0015] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A mechanical seal structure with rounded corners and oil grooves, comprising a coaxially matched stationary ring and a dynamic ring with rounded corners and oil grooves, characterized in that: The annular surface of the rounded oil-containing groove dynamic ring 3 is provided with rounded oil-containing grooves evenly distributed around the circumference, and the outer ends of the rounded oil-containing grooves are rounded.

2. The rounded oil-containing groove mechanical seal structure according to claim 1 is characterized in that: The fillet oil-containing groove is located on the contact ring surface with the stationary ring.

3. The rounded oil-containing groove mechanical seal structure according to claim 1, characterized in that: The inner diameter of the filleted oil groove dynamic ring R The inner radius of the contact surface between the stationary ring and the rounded oil grooved dynamic ring is 60.12 mm. R 1 is 73.2mm, and its outer radius of the contact ring surface R 2 is 84.2mm; the radius of the lower edge of the fillet oil groove r 1 is 70.7 mm, the radius of the upper edge of the fillet oil groove r 2 is 77 mm, the outer ring radius of the rounded oil groove dynamic ring r 3 is 84.3mm, the angle between the two sides of the fillet oil groove and the y-axis θ 1 is 61.8°, θ 2 is 69.2°, the distance between the lower edge of the fillet oil groove and the y-axis d 1 is 1.55 mm, the arc straight line distance of the lower edge of the fillet oil groove d 2 is 3.1 mm, the depth of the oil groove in the rounded corner h The fillet radius of the outer end of the fillet oil groove is 0.005 mm. Φ is 0.8mm; the number of rounded oil grooves is 35.

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