Labyrinth piston ring

Abstract

The utility model relates to the technical field of labyrinth piston ring discloses a kind of labyrinth piston ring, including piston ring body, the piston ring body opening one end inner wall is equipped with movable slot, the movable slot inner wall is fixedly connected with auxiliary sealing strip, the piston ring body other end opening is fixedly connected with protruding block, the protruding block inner wall is fixedly connected with main sealing strip, the protruding block is T block, the movable slot is T slot compatible with it, the sealing end face of main sealing strip is convex surface. In the utility model, by setting sealing strip with protruding block in the main piston ring body opening both sides, creatively combine static labyrinth seal with dynamic contact seal, under the sliding contact of main sealing strip and auxiliary sealing strip, it can self-adapting compensation wear and thermal deformation, fundamentally solve the leakage problem at opening, realize the efficient sealing of complete and lasting throughout the piston ring circumferential.

Description

Technical Field

[0001] This utility model relates to the field of labyrinth piston ring technology, and in particular to a labyrinth piston ring. Background Technology

[0002] Labyrinth piston rings are mainly used in reciprocating engines, steam turbines and other equipment. Through a special meshing tooth structure, they form a tortuous sealing channel, which, combined with an oil film, achieves a composite seal. This can significantly reduce gas and lubricating oil leakage, thereby improving the energy conversion efficiency of the equipment, saving fuel and lubricating oil, reducing exhaust pollution, enhancing power and extending service life, and achieving the goals of energy saving, environmental protection and efficiency improvement.

[0003] While existing labyrinth piston rings create a tortuous sealing path through a static meshing tooth structure, the essential ring opening always presents radial and circumferential gaps, becoming a major bottleneck for high-pressure fuel gas and lubricating oil leakage. Traditional solutions such as beveled openings, stepped openings, or multi-ring misalignment installations can only extend the leakage path to a limited extent, failing to achieve dynamic, adaptive, and tight sealing. Under harsh operating conditions of high temperature and high pressure, the gap at the opening is prone to widening due to wear and thermal deformation, leading to a sharp decline in sealing performance and resulting in problems such as reduced equipment efficiency, increased energy consumption, and increased emissions. In response to this technical problem, this application proposes a labyrinth piston ring. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a labyrinth piston ring. By setting sealing strips with protruding blocks on both sides of the opening of the main piston ring body, it creatively combines static labyrinth sealing with dynamic contact sealing. Under the sliding contact between the main sealing strip and the secondary sealing strip, it can adaptively compensate for wear and thermal deformation, fundamentally solving the leakage problem at the opening and achieving a complete and durable high-efficiency seal throughout the entire circumference of the piston ring.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A labyrinth piston ring includes a piston ring body. A movable groove is formed on the inner wall of one open end of the piston ring body. A secondary sealing strip is fixedly connected to the inner wall of the movable groove. A protrusion is fixedly connected to the other open end of the piston ring body. A main sealing strip is fixedly connected to the inner wall of the protrusion.

[0006] Furthermore, the protrusion is a T-shaped block, and the movable groove is a T-shaped groove adapted to it.

[0007] Furthermore, the sealing end face of the main sealing strip is a convex curved surface, and the sealing end face of the secondary sealing strip is a complementary concave curved surface.

[0008] Furthermore, a wear-resistant coating is provided on the contact area between the main sealing strip and the secondary sealing strip.

[0009] This utility model has the following beneficial effects: In this invention, by setting sealing strips with protruding blocks on both sides of the opening of the main piston ring body, static labyrinth sealing and dynamic contact sealing are creatively combined. Under the sliding contact between the main sealing strip and the secondary sealing strip, wear and thermal deformation can be adaptively compensated, fundamentally solving the leakage problem at the opening and achieving a complete and durable high-efficiency seal that runs through the entire circumference of the piston ring. Attached Figure Description

[0010] Figure 1 This is a perspective view of a labyrinth piston ring proposed in this utility model; Figure 2 This is a cross-sectional view of the piston ring body of a labyrinth piston ring proposed in this utility model.

[0011] Legend: 1. Piston ring body; 2. Protrusion block; 3. Main sealing strip; 4. Movable groove; 5. Secondary sealing strip. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] Reference Figure 1 and Figure 2 As shown, one embodiment of this utility model is provided: a labyrinth piston ring, including a piston ring body 1. A movable groove 4 is provided on the inner wall of one open end of the piston ring body 1. A secondary sealing strip 5 is fixedly connected to the inner wall of the movable groove 4. A protrusion 2 is fixedly connected to the other open end of the piston ring body 1. A main sealing strip 3 is fixedly connected to the inner wall of the protrusion 2. The protrusion 2 is a T-shaped block. The movable groove 4 is a T-shaped groove adapted to it. The sealing end face of the main sealing strip 3 is a convex curved surface. The sealing end face of the secondary sealing strip 5 is a complementary concave curved surface. A wear-resistant coating is provided on the contact part between the main sealing strip 3 and the secondary sealing strip 5.

[0014] Specifically, the main sealing strip 3 and the secondary sealing strip 5 are preferably made of materials with self-lubricating, high-temperature resistance and excellent wear resistance, such as polytetrafluoroethylene, polyimide or special engineering plastics, to ensure low friction and long service life of the dynamic sealing surface. By setting sealing strips with protrusions 2 on both sides of the opening of the main piston ring body 1, the static labyrinth seal and the dynamic contact seal are creatively combined. Under the sliding contact of the main sealing strip 3 and the secondary sealing strip 5, wear and thermal deformation can be adaptively compensated, which fundamentally solves the leakage problem at the opening and achieves a complete and durable high-efficiency seal that runs through the entire circumference of the piston ring.

[0015] Working principle: When in use, when high-pressure gas enters the gap on the back of the piston ring, it acts on the tail end of the main sealing strip 3, pushing it to slide radially outward in the movable groove 4 by means of the protrusion 2. This causes the front end of the main sealing strip 3 to be tightly pressed against the end face of the fixed secondary sealing strip 5, thus forming a dynamic sealing pair at the weakest opening of the traditional labyrinth ring, which is controlled by the medium pressure in real time. The clamping force of this sealing pair automatically increases with the increase of the operating pressure, ensuring absolute sealing under extreme operating conditions. When the pressure decreases, the sealing strip can return to its original position to avoid excessive friction and wear. It not only uses the labyrinth structure to throttle the gas passing through multiple times, but more importantly, it actively blocks the main leakage path through the movable component. At the same time, it can automatically compensate for the wear of the sealing surface during long-term operation, thus comprehensively solving the problems of gas leakage, oil consumption and sealing durability at the opening of the traditional piston ring.

[0016] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A labyrinth piston ring, characterized in that, The piston ring body (1) includes a piston ring body (1), with a movable groove (4) on the inner wall of one open end of the piston ring body (1), and a secondary sealing strip (5) fixedly connected to the inner wall of the movable groove (4). A protrusion (2) is fixedly connected to the other open end of the piston ring body (1), and a main sealing strip (3) is fixedly connected to the inner wall of the protrusion (2).

2. The labyrinth piston ring according to claim 1, characterized in that: The protrusion (2) is a T-shaped block, and the movable groove (4) is a T-shaped groove adapted to it.

3. A labyrinth piston ring according to claim 1, characterized in that: The sealing end face of the main sealing strip (3) is a convex curved surface, and the sealing end face of the secondary sealing strip (5) is a complementary concave curved surface.

4. A labyrinth piston ring according to claim 1, characterized in that: A wear-resistant coating is provided on the contact area between the main sealing strip (3) and the secondary sealing strip (5).

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