Sealing slip ring, sealing assembly and sealing structure

Abstract

The invention discloses a sealing slip ring, a sealing assembly and a sealing structure. The cross section of the sealing slip ring (5) is a square cross section, a U-shaped groove (1) is dug in the inner side of the square cross section, guide chamfers (2) are arranged at the two ends of the outer side of the square cross section, and the whole sealing slip ring (5) is of a concave thin-wall circular ring structure based on the structure of the U-shaped groove (1) in the square cross section. The service life of the sealing piece is prolonged, and the machining cost is reduced.

Description

Technical Field

[0001] The invention belongs to the field of aviation application technology, and in particular relates to a sealing slip ring, a sealing component and a sealing structure. Background Art

[0002] The existing sealing structures are basically in the form of a single sealing ring, a sealing ring plus a retaining ring, a Glyd ring (sealing ring plus a wear-resistant ring), etc., each of which has its own disadvantages. For example, the sealing ring is easily squeezed out under high pressure. The sealing ring plus a retaining ring improves the problem of easy squeezing out but does not solve the problems of high friction and easy rolling. The Glyd ring solves the above problems better, but it is difficult to install and has poor compensation. Summary of the invention

[0003] The purpose of the present invention is to provide a sealing slide ring, a sealing assembly and a sealing structure. The present invention prolongs the service life of the sealing component and reduces the processing cost.

[0004] The technical solution of the present invention is: a sealing slip ring, the cross-section of the sealing slip ring is a square cross-section, a U-shaped groove is dug on the inner side of the square cross-section, and guide chamfers are provided at both ends of the outer side of the square cross-section. Based on the U-shaped groove structure on the square cross-section, the sealing slip ring as a whole presents a concave thin-walled circular ring structure.

[0005] In the aforementioned sealing slip ring, the thickness T1 of the bottom of the U-shaped groove is 0.15-0.25 mm, the thickness T2 of the U-shaped wall of the U-shaped groove is 0.4-0.5 mm, and the guide chamfer is 0.5x15°.

[0006] In the aforementioned sealing slip ring, the notch of the U-shaped groove is provided with a process chamfer.

[0007] In the aforementioned sealing slip ring, the process chamfer is 0.2x30°.

[0008] The aforementioned sealing slip ring is made of fluoroplastic.

[0009] A sealing assembly using the above-mentioned sealing sliding ring comprises an O-type sealing ring, wherein the O-type cross section of the O-type sealing ring matches with the U-shaped groove on the cross section of the sealing sliding ring.

[0010] In the aforementioned sealing assembly, the height H of the U-shaped groove is greater than or equal to the radius of the O-ring.

[0011] A sealing structure based on the aforementioned sealing assembly comprises a sealing installation groove and a sealing cylindrical surface; the sealing assembly is installed in the sealing installation groove; the O-ring and the sealing slip ring of the sealing cylindrical surface sealing assembly are confined in the sealing installation groove, and the outer side of the square cross-section of the sealing slip ring abuts against the sealing cylindrical surface; the U-shaped arm of the U-shaped groove and the sealing installation groove slide in radial cooperation along the sealing cylindrical surface.

[0012] In the aforementioned sealing structure, the single-side clearance between the sealing sliding ring and the sealing installation groove is 0 to 0.05 mm.

[0013] The advantages of the present invention are as follows: the sealing slip ring, sealing assembly and sealing structure of the present invention can automatically provide guidance when the sealing cylindrical surface is installed into the sealing slip ring without the need for special tools, thereby ensuring that the sealing slip ring will not be cut by the sealing cylindrical surface; it can protect the O-type sealing ring from being squeezed out and damaged under high pressure; the rolling friction of the O-type sealing ring is converted into the sliding friction of the sealing slip ring, thereby extending the service life of the seal; and after the sealing slip ring is worn, a certain sealing compensation can be performed; the sealing slip ring is economical, practical and easy to process.

[0014] A certain type of brake device uses fuel medium to overcome the spring force to release the brake state. Its working pressure is 0.4MPa. It works in a low temperature environment for a long time and adopts a double-pass seal ring structure. In actual use, the working pressure of the brake device cannot overcome the spring force and the friction of the seal ring, resulting in the inability to release the brake; under low temperature conditions, due to the glassification of the seal ring rubber, it is easy to fail to seal and leak; in addition, the reciprocating motion also makes the seal ring easy to roll, resulting in seal failure and affecting the life of the seal ring. In order to solve the above problems, the seal ring rubber was replaced, retaining rings and Glyd rings (seal rings plus wear-resistant rings) were added on both sides of the seal ring. The problem has improved but has not been fundamentally solved. Later, the traditional seal slip ring structure was adopted to solve the problems of high friction, low temperature leakage and seal ring rolling. However, the diameter of the traditional seal slip ring is about 6% larger than the diameter of the seal groove. Before installation, special tools are required to spend several hours to reduce the slip ring to the appropriate size, and the success rate is only 10% during assembly. In addition, the seal ring is easily squeezed out and damaged under high pressure. The sealing slip ring, sealing assembly and sealing structure of the present invention convert the rolling friction of the sealing ring into the sliding friction of the sealing slip ring, thereby reducing the friction force of the sealing ring, eliminating the problems of sealing ring tumbling and low-temperature leakage, and the sealing ring does not need to be replaced within the calendar life, and the service life is extended by more than two times; the appropriate thickness of the sealing slip ring not only further increases the service life, but also can automatically compensate for the gap caused by the wear of the slip ring together with the sealing ring to ensure the sealing performance; the U-shaped arm of the sealing slip ring protects the sealing ring from being squeezed out under high pressure; the specially arranged chamfer on the sealing slip ring not only retains the traditional slip ring motion support but also provides an automatic guiding function, thereby improving the installation success rate, and no special tools are required, and the installation can be 100% successful. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the existing sealing structure.

[0016] Figure 2 is a schematic structural diagram of Embodiment 1 of the present invention;

[0017] Figure 3 is a schematic diagram of the structure before installation of Embodiment 1 of the present invention;

[0018] Figure 4 It is a schematic diagram of the structure of embodiment 2 of the present invention.

[0019] Among them, 1-U-shaped groove, 2-guide chamfer, 3-process chamfer, 4-O-type sealing ring, 5-sealing sliding ring, 6-sealing installation groove, 7-sealing cylindrical surface. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0021] The features and illustrative embodiments of various aspects of the present invention will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention. The present invention is by no means limited to any specific settings and methods proposed below, but covers any improvements, replacements and modifications of structures, methods, devices without departing from the spirit of the present invention. In the accompanying drawings and the following description, known structures and technologies are not shown to avoid unnecessary ambiguity in the present invention.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other, and the embodiments can refer to and quote each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] Example 1. Figure 2 , Figure 3 , Figure 4 As shown, a sealing slip ring, a sealing assembly and a sealing structure, the cross section of the sealing slip ring 5 is a square cross section, a U-shaped groove 1 is dug inside the square cross section, and guide chamfers 2 are provided at both ends of the outer side of the square cross section. Based on the structure of the U-shaped groove 1 on the square cross section, the sealing slip ring 5 is a concave thin-walled circular ring structure as a whole. When the sealing cylindrical surface 7 is installed into the sealing slip ring 5, the guide chamfer 2 provides guidance to ensure that the sealing slip ring 5 will not be cut by the sealing cylindrical surface 7.

[0024] The bottom thickness T1 of the U-shaped groove 1 is 0.15-0.25 mm, the U-shaped wall thickness T2 of the U-shaped groove 1 is 0.4-0.5 mm, and the guide chamfer 2 is 0.5x15°.

[0025] The notch of the U-shaped groove 1 is provided with a process chamfer 3 .

[0026] The process chamfer 3 is 0.2 x 30°. This structure facilitates the processing of the U-shaped groove 1.

[0027] The sealing slide ring 5 is made of fluoroplastic.

[0028] The sealing assembly of the sealing slide ring includes an O-shaped sealing ring 4, and the O-shaped section of the O-shaped sealing ring 4 matches the U-shaped groove 1 on the section of the sealing slide ring 5. The U-shaped groove 1 can ensure that the sealing slide ring 5 and the O-shaped sealing ring 4 are in reliable contact, have a certain compression margin, and will not damage the O-shaped sealing ring 4.

[0029] The height H of the U-shaped groove 1 of the sealing component is greater than or equal to the radius of the O-type sealing ring 4. This structure can protect the O-type sealing ring 4 from being squeezed out and damaged under high pressure.

[0030] The sealing structure includes a sealing installation groove 6 and a sealing cylindrical surface 7; the sealing assembly is installed in the sealing installation groove 6; the sealing cylindrical surface 7 restricts the O-ring 4 and the sealing slip ring 5 of the sealing assembly in the sealing installation groove 6, and the outer side of the square cross section of the sealing slip ring 5 abuts against the sealing cylindrical surface 7; the U-shaped arm of the U-shaped groove 1 and the sealing installation groove 6 slide radially along the sealing cylindrical surface 7. The sealing cylindrical surface 7 can reciprocate or rotate relative to the sealing installation groove 6; under the elastic force of the O-ring 4, the outer side of the sealing slip ring 5 is always in close contact with the sealing cylindrical surface 7, realizing a combined seal, and converting the rolling friction of the O-ring 4 into sliding friction, and after the sealing slip ring 5 is worn, a certain sealing compensation can be performed.

[0031] The single-side clearance between the sealing slip ring 5 and the sealing installation groove 6 is 0-0.05 mm. This structure can ensure that the sealing slip ring 5 can be easily installed into the sealing installation groove 6 and can be reliably fixed in the sealing installation groove 6.

[0032] Embodiment 2. The following is another embodiment of the present invention.

[0033] like Figure 4 , this embodiment is a sealing structure of a sealing ring groove on a shaft.

[0034] Embodiment 3. A sealing slip ring, a sealing assembly and a sealing structure, see Figure 1-Figure 4The cross section of the sealing slip ring 5 is a square cross section, a U-shaped groove 1 is dug inside the square cross section, and guide chamfers 2 are provided at both ends of the outer side of the square cross section. Based on the structure of the U-shaped groove 1 on the square cross section, the sealing slip ring 5 is a concave thin-walled circular ring structure as a whole. When the sealing cylindrical surface 7 is installed into the sealing slip ring, the guide chamfer 2 provides guidance to ensure that the sealing slip ring will not be cut by the sealing cylindrical surface 7.

[0035] The bottom thickness T1 of the aforementioned U-shaped groove 1 is 0.15-0.25 mm, the U-shaped wall thickness T2 of the U-shaped groove 1 is 0.4-0.5 mm, and the guide chamfer 2 is 0.5x15°. The bottom thickness T1 can ensure the sealing life and can also use the elastic force of the O-shaped sealing ring to fit the sealing slide ring tightly with the sealing surface; the U-shaped arm thickness T2 can ensure that the O-shaped sealing ring is reliably fixed in the sealing installation groove and also provide a certain protection for the O-shaped sealing ring, so that the O-shaped sealing ring will not be squeezed out and damaged under high pressure, and the appropriate thickness also reduces the weight of the sealing slide ring and reduces the processing difficulty; the guide chamfer is a relatively small and long chamfer in order to have a longer lead, so that when the sealing cylindrical surface is installed into the sealing slide ring without the need for a closing tool, the sealing cylindrical surface can be guided to pass through the sealing slide ring smoothly, and the sealing cylindrical surface will not cut the sealing slide ring.

[0036] The notch of the aforementioned U-shaped groove 1 is provided with a process chamfer 3 .

[0037] The aforementioned process chamfer 3 is 0.2×30°. This structure facilitates the processing of the U-shaped groove 1 .

[0038] The aforementioned sealing slip ring 5 is made of fluoroplastics, which are economical, easy to process, and have good temperature resistance, aging resistance, wear resistance, and chemical stability.

[0039] A sealing assembly using the aforementioned sealing slide ring includes an O-type sealing ring 4, the O-shaped cross section of the O-type sealing ring 4 matches the U-shaped groove 1 on the cross section of the sealing slide ring 5. The U-shaped groove 1 can ensure that the sealing slide ring 5 and the O-type sealing ring 4 are in reliable contact, have a certain compression margin, and will not damage the O-type sealing ring 4.

[0040] The groove height H of the aforementioned U-shaped groove 1 is greater than or equal to the radius of the O-type sealing ring 4. This structure can protect the O-type sealing ring 4 from being squeezed out and damaged under high pressure.

[0041] A sealing structure based on the aforementioned sealing assembly comprises a sealing installation groove 6 and a sealing cylindrical surface 7; the sealing assembly is installed in the sealing installation groove 6; the O-ring 4 and the sealing slip ring 5 of the sealing cylindrical surface 7 sealing assembly are confined in the sealing installation groove 6, and the outer side of the square cross section of the sealing slip ring 5 abuts against the sealing cylindrical surface 7; the U-shaped arm of the U-shaped groove 1 and the sealing installation groove 6 slide radially along the sealing cylindrical surface 7. The sealing cylindrical surface 7 can reciprocate or rotate back and forth relative to the sealing installation groove 6; under the elastic force of the O-ring 4, the outer side of the sealing slip ring 5 is always in close contact with the sealing cylindrical surface 7, realizing a combined seal, and converting the rolling friction of the O-ring 4 into sliding friction, and after the sealing slip ring 5 is worn, a certain sealing compensation can be performed.

[0042] The single-side clearance between the aforementioned sealing slip ring 5 and the sealing installation groove 6 is 0-0.05 mm. This structure can ensure that the sealing slip ring 5 can be easily installed into the sealing installation groove 6 and can be reliably fixed in the sealing installation groove 6.

Claims

1. A sealing slip ring, characterized in that: The cross section of the sealing sliding ring (5) is a square cross section, a U-shaped groove (1) is dug on the inner side of the square cross section, and guide chamfers (2) are provided at both ends of the outer side of the square cross section. Based on the structure of the U-shaped groove (1) on the square cross section, the sealing sliding ring (5) as a whole presents a concave thin-walled circular ring structure.

2. The sealing slip ring according to claim 1, characterized in that: The bottom thickness T1 of the U-shaped groove (1) is 0.15-0.25 mm, the U-shaped wall thickness T2 of the U-shaped groove (1) is 0.4-0.5 mm, and the guide chamfer (2) is 0.5x15°.

3. The sealing slip ring according to claim 1, characterized in that: The notch of the U-shaped groove (1) is provided with a process chamfer (3).

4. The sealing slip ring according to claim 3, characterized in that: The process chamfer (3) is 0.2x30°.

5. The sealing slip ring according to claim 1, characterized in that: The sealing slide ring (5) is made of fluoroplastics.

6. A sealing assembly using the sealing slide ring according to any one of claims 1 to 5, characterized in that: It comprises an O-type sealing ring (4), the O-type cross section of the O-type sealing ring (4) matches with a U-shaped groove (1) on the cross section of a sealing sliding ring (5).

7. The sealing assembly according to claim 6, characterized in that: The groove height H of the U-shaped groove (1) is greater than or equal to the radius of the O-shaped sealing ring (4).

8. A sealing structure based on the sealing assembly according to claim 6 or 7, characterized in that: It comprises a sealing installation groove (6) and a sealing cylindrical surface (7); the sealing assembly is installed in the sealing installation groove (6); the O-ring (4) and the sealing slide ring (5) of the sealing cylindrical surface (7) sealing assembly are restricted in the sealing installation groove (6), and the outer side of the square cross section of the sealing slide ring (5) abuts against the sealing cylindrical surface (7); the U-shaped arm of the U-shaped groove (1) and the sealing installation groove (6) are radially slidably matched along the sealing cylindrical surface (7).

9. The sealing structure according to claim 8, characterized in that: The single-side clearance between the sealing sliding ring (5) and the sealing installation groove (6) is 0 to 0.05 mm.

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