Labyrinth type sealing turbocharger

Abstract

The utility model discloses a labyrinth type sealing turbocharger which comprises a connecting body, a rotating shaft is connected in the connecting body in a rotating mode, a circular groove is formed in the end face of the connecting body, a sealing sleeve is arranged on the rotating shaft located in the circular groove, and a disc is arranged on the outer curved surface of the sealing sleeve. A sealing ring is installed in the circular groove through a clamping assembly, the inner curved surface of the sealing ring is bent downwards to form an inner ring, the outer edge of the upper side face of the disc is bent upwards to form a surrounding ring, the surrounding ring surrounds the inner ring, an inserting ring is arranged on the disc, and the surrounding ring, the inserting ring, the disc and the inner ring on the sealing ring form axial sealing. Radial sealing is formed among the circular ring, the bottom face of the disc and the shaft sleeve, axial sealing and the radial sealing are combined to form a labyrinth structure, the upper sealing ring and the lower sealing ring are matched, oil leakage can be effectively avoided, and the sealing effect of the sealing ring is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of turbochargers, in particular to a turbocharger with a labyrinth seal. Background Art

[0002] A turbocharger is a device installed in a vehicle that drives a turbine to rotate through engine exhaust gas, and then drives an impeller in a coaxial compressor to rotate, and compresses air to increase the intake air volume of the engine.

[0003] The rotating shaft in the turbocharger is installed through bearings, and the bearings need to be lubricated. Currently, the sealing solution for one end of the bearing (in the direction close to the impeller) is generally to set a sealing ring and then set two sealing rings in the sealing ring for sealing. This solution has a poor sealing effect, making the turbocharger prone to oil leakage and reducing its service life. Therefore, it needs to be improved. Content of the Utility Model

[0004] In view of the deficiencies of the prior art, the utility model provides a turbocharger with a labyrinth seal to solve the problems mentioned in the above background art.

[0005] The utility model provides the following technical solutions: A turbocharger with a labyrinth seal includes a compressor housing, a turbine housing, and a connecting body. A rotating shaft that extends into the compressor housing and the turbine housing respectively is rotatably connected in the connecting body through bearings. Impellers and turbines are respectively installed at both ends of the rotating shaft. A circular groove is provided in the end face of the connecting body close to the impeller. An oil inlet hole and an oil outlet hole are also provided in the connecting body. A sealing sleeve is provided on the rotating shaft located in the circular groove, and a disc is provided on the outer curved surface of the sealing sleeve.

[0006] A sealing ring is installed in the circular groove through a clamping assembly. The inner curved surface of the sealing ring is bent downward to form an inner ring. The inner ring is attached to a first sealing ring installed in the sealing sleeve, and the lower side surface of the inner ring is close to the disc.

[0007] The outer edge of the upper side surface of the disc is bent upward to form an enclosing ring. The enclosing ring encloses the inner ring, and there is a gap between the enclosing ring and the inner ring.

[0008] Preferably, a ring groove is provided in the lower side surface of the inner ring, and an insertion ring inserted into the ring groove is also provided on the upper side surface of the disc. There is a gap between the insertion ring and the ring groove.

[0009] Preferably, the height of the upper side surface of the disc inside the insertion ring is higher than the height of the upper side surface of the disc between the insertion ring and the enclosing ring.

[0010] Preferably, two first sealing rings are arranged in an up-and-down distribution.

[0011] Preferably, the clamping assembly includes a clamping groove provided in the circular groove surface. A snap ring is installed in the clamping groove, and the snap ring presses on the upper side of the sealing ring. An outer ring is integrally formed on the lower side surface of the sealing ring. A supporting ring is also integrally formed on the curved surface of the circular groove, and the supporting ring presses on the lower side of the outer ring.

[0012] Preferably, an installation groove is provided at the outer edge of the lower side surface of the outer ring, and a second sealing ring is installed in the installation groove, and the second sealing ring is attached to the supporting ring.

[0013] Preferably, a tray is integrally formed on the upper side surface of the sealing ring. The side surface of the tray close to the impeller is concave inward at its axis to form a bowl shape.

[0014] Preferably, two bushings are also provided between the bearing and the sealing sleeve and are distributed vertically. An air sealing cover is provided on the step of the lower bushing, and an oil baffle is provided on the air sealing cover. A circular ring that extends upward and then horizontally is integrally formed on the inner side of the oil baffle. The circular ring is inserted between the disc and the step of the upper bushing. There are gaps between the circular ring and the disc, and between the circular ring and the step of the upper bushing respectively.

[0015] The utility model provides a turbocharger with a labyrinth seal, which has the following beneficial effects:

[0016] A disc is provided on the sealing sleeve of the utility model, and surrounding rings and inserting rings distributed inside and outside are provided on the disc. The surrounding rings, inserting rings and the disc form an axial seal with the inner ring on the sealing ring. The circular ring in the utility model forms a radial seal with the bottom surface of the disc and the bushing. The axial seal and the radial seal are combined in a labyrinth structure, and together with the upper and lower double sealing rings, it can effectively avoid oil leakage and improve the sealing effect of the utility model;

[0017] A tray closer to the impeller is provided on the sealing ring of the utility model, so that a pressure chamber is formed between the impeller and the tray when the impeller rotates, further reducing the risk of oil leakage and improving the service life of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram inside the utility model;

[0019] Figure 2 is Figure 1 the enlarged schematic diagram at A in

[0020] Figure 3 is Figure 2 the enlarged schematic diagram at B in

[0021] In the figure:

[0022] 11. Compressor housing; 12. Turbine housing; 13. Connecting body; 14. Rotating shaft; 15. Impeller; 16. Turbine; 17. Circular groove; 18. Sealing sleeve; 19. Disc; 20. Sealing ring; 21. Inner ring; 22. First sealing ring; 23. Enclosing ring; 24. Insert ring; 25. Snap ring; 26. Outer ring; 27. Supporting ring; 28. Second sealing ring; 29. Tray; 30. Bearing. Specific embodiments

[0023] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "radial", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Refer to Figures 1 - 3, according to an embodiment of a turbocharger with a labyrinth seal of the present utility model, it includes a compressor housing 11, a turbine housing 12 and a connecting body 13. A rotating shaft 14 that extends into the compressor housing 11 and the turbine housing 12 respectively is rotatably connected in the connecting body 13 through a bearing 30. Impellers 15 and turbines 16 are respectively installed at both ends of the rotating shaft 14. A circular groove 17 is provided in the end face of the connecting body 13 close to the impeller 15.

[0028] An oil inlet hole and an oil outlet hole acting on the bearing 30 are also provided in the connecting body 13. In order to achieve sealing and avoid oil leakage, a sealing sleeve 18 is provided on the rotating shaft 14 located in the circular groove 17. A disc 19 is arranged on the outer curved surface of the sealing sleeve 18. A sealing ring 20 is installed in the circular groove 17 through a clamping assembly. The inner curved surface of the sealing ring 20 is bent downward to form an inner ring 21. The inner ring 21 is attached to a first sealing ring 22 installed in the sealing sleeve 18.

[0029] In this embodiment, two first sealing rings 22 are arranged in an up-and-down distribution, and the lower side surface of the inner ring 21 is close to the disc 19 to form a labyrinth structure, improve the sealing effect and avoid oil leakage.

[0030] In the second embodiment of the turbocharger with a labyrinth seal, in order to further improve the sealing effect, the outer edge of the upper side surface of the disc 19 is bent upward to form a surrounding ring 23. The surrounding ring 23 surrounds the inner ring 21. A first gap is formed between the inner curved surface of the surrounding ring 23 and the outer curved surface of the inner ring 21. In addition, a ring groove is provided in the lower side surface of the inner ring 21, and an inserting ring 24 inserted into the ring groove is also provided on the upper side surface of the disc 19. A second gap is formed between the inserting ring 24 and the ring groove. Both the first gap and the second gap are between 0.1 - 0.25 mm. In addition, the height of the upper side surface of the disc 19 inside the inserting ring 24 is higher than the height of the upper side surface of the disc 19 between the inserting ring 24 and the surrounding ring 23. An axial labyrinth structure is formed among the inserting ring 24, the surrounding ring 23 and the inner ring 21. Through experiments, it can effectively reduce oil leakage and enhance the sealing effect.

[0031] In this embodiment, the clamping assembly includes a clamping groove provided in the curved surface of the circular groove 17. A snap ring 25 is installed in the clamping groove, and the snap ring 25 presses on the upper side of the sealing ring 20. An outer ring 26 is integrally formed on the lower side surface of the sealing ring 20. A supporting ring 27 is also integrally formed on the curved surface of the circular groove 17. The supporting ring 27 presses on the lower side of the outer ring 26, that is, the sealing ring 20 is locked in the up-and-down position by the snap ring 25 and the supporting ring 27 to prevent contact between the inner ring 21 and the inserting ring 24 and the disc 19.

[0032] In order to improve the sealing effect at the outer edge of the sealing ring 20, an installation groove is provided at the outer edge of the lower side surface of the outer ring 26, and a second sealing ring 28 is installed in the installation groove, and the second sealing ring 28 is attached to the supporting ring 27.

[0033] In addition, a tray 29 is integrally formed on the upper side surface of the sealing ring 20. The side surface of the tray 29 close to the impeller 15 is concave at its axis to form a bowl shape, and the tray 29 is close to the impeller 15. When the impeller 15 rotates, a pressure chamber will be formed between the impeller 15 and the upper side surface of the tray 29, avoiding oil leakage and improving the sealing effect at the first sealing ring 22.

[0034] In this embodiment, both of the first sealing rings 22 are ceramic sealing rings to improve the service life of the labyrinth-sealed turbocharger.

[0035] In order to further improve the labyrinth path and the sealing effect, in the third embodiment of the labyrinth-sealed turbocharger, two bushings 31 are further provided between the bearing 30 and the sealing sleeve 18 and are distributed vertically. An air sealing cover 32 is provided on the step of the lower bushing 31. The functions of the air sealing cover 32 and the oil baffle plate installed thereon are the prior art and will not be described in detail here. An annular ring 41 is integrally formed on the inner side of the oil baffle plate and extends upward and then horizontally between the disc 19 and the step of the upper bushing 31. There is a third gap between the annular ring 41 and the disc 19, and a fourth gap between the annular ring 41 and the step of the upper bushing 31. Both the third gap and the fourth gap are also between 0.1 - 0.25 mm.

[0036] In this third embodiment, an axial seal is formed between the surrounding ring 23 and the inserted ring 24 and the inner ring, and a radial seal is formed between the annular ring 41 and the bottom surface of the disc 19 and the bushing 31. The axial seal and the radial seal together constitute a labyrinth structure to improve the sealing performance.

[0037] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A labyrinth-sealed turbocharger, comprising a compressor housing (11), a turbine housing (12) and a connecting body (13), characterized in that: A rotating shaft (14) is rotatably connected inside the connecting body (13) through a bearing (30) and extends into the compressor housing (11) and the turbine housing (12) respectively. Impellers (15) and turbines (16) are respectively installed at both ends of the rotating shaft (14). A circular groove (17) is provided in the end face of the connecting body (13) close to the impeller (15). An oil inlet hole and an oil outlet hole are also provided in the connecting body (13). A sealing sleeve (18) is provided on the rotating shaft (14) located in the circular groove (17), and a disc (19) is arranged on the outer curved surface of the sealing sleeve (18). A sealing ring (20) is installed in the circular groove (17) through a clamping assembly. The inner curved surface of the sealing ring (20) is bent downward to form an inner ring (21). The inner ring (21) is attached to a first sealing ring (22) installed inside the sealing sleeve (18), and the lower side surface of the inner ring (21) is close to the disc (19). An enclosing ring (23) is bent upward at the outer edge of the upper side surface of the disc (19). The enclosing ring (23) encloses the inner ring (21), and there is a gap between the enclosing ring (23) and the inner ring (21).

2. The turbocharger with a labyrinth seal according to claim 1, wherein: A ring groove is provided in the lower side surface of the inner ring (21), and an inserting ring (24) inserted into the ring groove is also provided on the upper side surface of the disc (19). There is a gap between the inserting ring (24) and the ring groove.

3. The turbocharger with labyrinth seal according to claim 2, wherein: The height of the upper side surface of the disc (19) inside the inserting ring (24) is higher than the height of the upper side surface of the disc (19) between the inserting ring (24) and the enclosing ring (23).

4. A turbocharger with a labyrinth seal according to claim 1, characterized in that: Two first sealing rings (22) are arranged in an up-and-down distribution.

5. A turbocharger with a labyrinth seal according to claim 1, characterized in that: The clamping assembly includes a clamping groove provided in the curved surface of the circular groove (17). A circlip (25) is installed in the clamping groove, and the circlip (25) presses on the upper side of the sealing ring (20). An outer ring (26) is integrally formed on the lower side surface of the sealing ring (20). A supporting ring (27) is also integrally formed on the curved surface of the circular groove (17), and the supporting ring (27) presses on the lower side of the outer ring (26).

6. The turbocharger with a labyrinth seal according to claim 5, characterized in that: An installation groove is provided at the outer edge of the lower side surface of the outer ring (26), and a second sealing ring (28) is installed in the installation groove. The second sealing ring (28) is attached to the supporting ring (27).

7. A turbocharger with a labyrinth seal according to claim 1, characterized in that: A tray (29) is integrally formed on the upper side surface of the sealing ring (20). The side surface of the tray (29) close to the impeller (15) is concave inward at its axis to form a bowl shape.

8. A turbocharger with a labyrinth seal according to claim 1, characterized in that: Two shaft sleeves (31) are also provided between the bearing (30) and the sealing sleeve (18) in an up-and-down distribution. An air sealing cover (32) is provided on the step of the lower shaft sleeve (31), and an oil baffle is provided on the air sealing cover (32). A circular ring (41) that extends upward and then horizontally is integrally formed on the inner side of the oil baffle. The circular ring (41) is inserted between the disc (19) and the step of the upper shaft sleeve (31). There are gaps between the circular ring (41) and the disc (19), and between the circular ring (41) and the step of the upper shaft sleeve (31) respectively.

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