High-rotating-speed labyrinth contact type air seal

Abstract

The utility model discloses a high-rotating-speed labyrinth contact type air seal which is used for sealing the low-pressure side and the high-pressure side of a pivoting assembly, and the pivoting assembly comprises a box body, a transmission shaft and a rotating piece. Vent holes communicated with an inner cavity of the box body are formed in the outer wall of the box body, the transmission shaft is rotationally installed in the box body, and the rotating piece is fixed to the end, extending out of the box body, of the rotating shaft; in the pivoting assembly, the two sides of the vent hole are the low-pressure side and the high-pressure side respectively; wherein one side provided with the rotating piece is a low-voltage side, and the other side is a high-voltage side; an axial sealing assembly is arranged between the box body and the transmission shaft, a radial sealing assembly is arranged between the box body and the rotating piece, and the axial sealing assembly and the radial sealing assembly are both arranged on the low-pressure side of the pivoting assembly. According to the scheme, the axial sealing assembly is used for sealing the pivoting assembly in the axial direction, the axial sealing assembly is used for sealing the rotating part and the transmission shaft in the radial direction, then the sealing effect of the air seal is better, and the efficiency of the whole machine is improved.

Description

Technical Field

[0001] The utility model relates to the field of high-speed sealing structures, in particular to a high-speed labyrinth contact type air seal. Background Art

[0002] When a gearbox equipped with an impeller runs at high speed, a high-pressure environment will be formed inside the box, while a high-speed rotation of the impeller side will form a low-pressure environment; the vents on the gearbox are connected to the atmospheric pressure, which in turn creates various pressure differences on the pivot assembly, causing the lubricating oil on the gearbox side to leak and the atmospheric pressure gas to run to the impeller side.

[0003] The prior art with publication number CN217582569U discloses an integrated air seal and oil seal structure for a centrifugal fan, wherein the integrated air seal and oil seal structure comprises an oil seal portion and an air seal portion, wherein an O-ring retaining groove is provided on the outer wall of the oil seal portion, an oil seal groove is provided on the inner wall of the oil seal portion, an oil unloading groove is provided on the main shaft, an air seal groove is provided on the inner wall of the air seal portion, an air discharge groove is provided in the middle part of the air seal groove, the left end face of the oil seal portion cooperates with the right outer ring of the bearing, an inner cavity of the fan is provided on the outside of the air seal portion, a bearing pressure cover is provided on the left side of the bearing seat and the bearing, an O-ring retaining groove is provided on one side of the bearing pressure cover, an oil unloading groove is provided on the main shaft, an oil passage connecting groove is provided on the bottom of the oil seal portion, and an oil passage connecting groove is provided on the bottom of the bearing pressure cover.

[0004] The structure in the prior art can only perform sealing in the axial direction of the main shaft, and the gas seal portion and the main shaft are only matched through end faces, thereby resulting in poor airtightness of the gas seal and oil seal assembly. Utility Model Content

[0005] In order to solve the problem of poor air tightness on the high-pressure side and the low-pressure side of the pivot assembly in the prior art under high-speed operation, the purpose of the present utility model is to provide a high-speed labyrinth contact air seal, which has a better sealing effect.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a high-speed labyrinth contact air seal is used to seal the low-pressure side and the high-pressure side of the pivot assembly, and the pivot assembly includes a housing, a transmission shaft and a rotating part; a vent hole connected to its inner cavity is provided on the outer wall of the housing, the transmission shaft is rotatably installed in the housing, and the rotating part is fixed to the end of the rotating shaft extending out of the housing; in the pivot assembly, the two sides of the vent hole are respectively the low-pressure side and the high-pressure side; the side where the rotating part is installed is the low-pressure side, and the other side is the high-pressure side; an axial sealing assembly is provided between the housing and the transmission shaft, and a radial sealing assembly is provided between the housing and the rotating part, and both the axial sealing assembly and the radial sealing assembly are provided on the low-pressure side of the pivot assembly.

[0007] Preferably, the axial sealing assembly includes an air sealing ring and an axial air seal; the air sealing ring is sleeved on the transmission shaft, the air sealing ring is tightly fitted with the transmission shaft, the axial air sealing sleeve is arranged on the air sealing ring, the axial air seal is fixedly connected to the box body, and a labyrinth sealing structure is arranged between the axial air seal and the air sealing ring.

[0008] Preferably, the labyrinth sealing structure includes a first sealing portion, a second sealing portion and a third sealing portion arranged on the axial air seal, and the first sealing portion, the second sealing portion and the third sealing portion all protrude from the inner wall of the axial air seal; the second sealing portion is located between the two first sealing portions, and the first sealing portion cooperates with the outer wall of the air seal ring; a plurality of axially arranged first grooves are provided on the outer wall of the air seal ring, and the plurality of second sealing portions correspond one-to-one to the plurality of first grooves, and the second sealing portions extend into the first grooves; the plurality of third sealing portions correspond one-to-one to the plurality of second sealing portions, and the plurality of second sealing portions and the plurality of third sealing portions are alternately arranged, and the third sealing portion cooperates with the outer wall of the air seal ring.

[0009] Preferably, the third sealing portion includes third sealing teeth, fourth sealing teeth and fifth sealing teeth, which are arranged in sequence and axially, and have different heights.

[0010] Preferably, the fourth sealing teeth, the fifth sealing teeth and the third sealing teeth are arranged in sequence from the low-pressure side to the high-pressure side.

[0011] Preferably, the fourth sealing tooth and the fifth sealing tooth are clearance-fitted, and the fifth sealing tooth and the third sealing tooth are tight-fitted.

[0012] Preferably, the height of the fourth sealing tooth is lower than that of the third sealing tooth, and the height of the third sealing tooth is lower than that of the fifth sealing tooth.

[0013] Preferably, the end surface of the rotating part facing the transmission shaft is a radial sealing surface, a third groove is provided on the radial sealing surface, one end of the air sealing ring extends into the third groove, and the air sealing ring cooperates with the third groove to form a sealing structure.

[0014] Preferably, the radial sealing assembly includes a radial air seal, which is fixed on the axial air seal. The radial air seal is provided with a sixth sealing tooth and a seventh sealing tooth, which are alternately arranged. The sixth sealing tooth cooperates with the radial sealing surface of the rotating part to form a sealing structure. A fourth groove is also provided on the radial sealing surface. One end of the seventh sealing tooth extends into the fourth groove. The seventh sealing tooth cooperates with the inner wall of the fourth groove to form a sealing gap.

[0015] Preferably, the length of the sixth sealing tooth is shorter than that of the seventh sealing tooth.

[0016] The beneficial effects of the technical solution of the present invention are: the axial direction of the pivot assembly is sealed by the axial sealing assembly, and the radial direction of the rotating part and the transmission shaft are sealed by the axial sealing assembly, thereby making the air sealing effect better and improving the efficiency of the whole machine; the above-mentioned sealing structure is simpler to manufacture, easy to install and replace, which not only reduces maintenance costs, but also has a wider and safer application environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of a high-speed labyrinth contact gas seal;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 Schematic diagram of the connection structure of the gas seal ring, radial gas seal and axial gas seal;

[0020] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0021] Figure 5 Schematic diagram of the structure of the gas sealing ring;

[0022] Figure 6 It is a structural diagram of the axial gas seal;

[0023] Figure 7 Schematic diagram of the structure of the impeller and transmission shaft.

[0024] Reference numerals: 1, rotating member; 11, radial sealing surface; 12, third groove; 13, fourth groove;

[0025] 2. Transmission shaft; 21. First mounting portion; 22. Second mounting portion; 23. Third mounting portion; 24. First positioning portion; 25. Second positioning portion;

[0026] 3. Box body; 31. Vent hole; 32. First latching protrusion; 33. Second latching protrusion; 34. Third latching protrusion; 35. Oil inlet;

[0027] 4. Sliding bearing; 41. Lubricating oil channel;

[0028] 5. Air sealing ring; 51. First groove; 52. Fifth groove;

[0029] 6. Axial air seal; 61. First sealing portion; 62. Second groove; 63. First clamping portion; 64. Second sealing portion; 65. Third sealing portion; 651. Third sealing tooth; 652. First sealing member; 6521. Second clamping portion; 6522. Fourth sealing tooth; 653. Second sealing member; 6531. Fifth sealing tooth; 66. Step through hole;

[0030] 7. Oil seal;

[0031] 8. Radial air seal; 81. Sixth sealing tooth; 82. Seventh sealing tooth; 83. Fourth sealing portion;

[0032] 9. Bolt; 10. Sealing ring. DETAILED DESCRIPTION

[0033] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like to indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more, unless expressly limited otherwise.

[0036] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0037] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature. Example

[0038] like Figures 1 to 7 The illustrated high-speed labyrinth contact gas seal is used to seal the low-pressure and high-pressure sides of a pivot assembly. The pivot assembly comprises a housing 3, a drive shaft 2, and a rotating member 1. A vent 31 communicating with the housing's interior is provided on the outer wall of the housing 3. The drive shaft 2 is rotatably mounted within the housing 3, and the rotating member 1 is fixed to the end of the rotating shaft extending out of the housing 3.

[0039] In the pivot assembly, the two sides of the vent hole 31 are respectively the low-pressure side and the high-pressure side; the side where the rotating member 1 is installed is the low-pressure side, and the other side is the high-pressure side;

[0040] An axial sealing assembly is provided between the housing 3 and the transmission shaft 2 , and a radial sealing assembly is provided between the housing 3 and the rotating member 1 . Both the axial sealing assembly and the radial sealing assembly are provided on the low-pressure side of the pivot assembly.

[0041] The high-speed operation of the pivot assembly will form a high-pressure environment in the casing, and the high-speed rotation of the impeller side will form a low-pressure environment; the vents on the casing are connected to the atmospheric pressure, which in turn forms various pressure differences on the pivot assembly, thereby causing the lubricating oil on the gearbox side to leak; the atmospheric pressure gas is at risk of running to the impeller side; the above scheme is adopted to seal the axial direction of the pivot assembly through the axial sealing assembly, and to seal the radial direction of the rotating part 1 and the transmission shaft 2 through the axial sealing assembly, thereby making the air seal effect better and improving the efficiency of the whole machine; the above sealing structure is simpler to manufacture, easy to install and replace, which not only reduces maintenance costs, but also has a wider and safer application environment.

[0042] In this embodiment, Figure 1 and Figure 2 As shown, the axial sealing assembly includes an air seal ring 5 and an axial air seal 6; the air seal ring 5 is sleeved on the transmission shaft 2, and the air seal ring 5 is tightly fitted with the transmission shaft 2. The axial air seal 6 is sleeved on the air seal ring 5, and the axial air seal 6 is fixedly connected to the box body 3. A labyrinth sealing structure is provided between the axial air seal 6 and the air seal ring 5.

[0043] More preferably, Figure 2 As shown, a first clamping groove is provided on the outer wall of the axial gas seal 6 , and a first clamping protrusion 32 is protruded on the inner wall of the box body 3 , and the first clamping protrusion 32 is embedded in the first clamping groove.

[0044] In this embodiment, Figure 3 and Figure 4 As shown, the labyrinth seal structure includes a first sealing portion 61, a second sealing portion 64 and a third sealing portion provided on the axial gas seal 6, and the first sealing portion 61, the second sealing portion 64 and the third sealing portion 65 all protrude from the inner wall of the axial gas seal 6;

[0045] The second sealing portion 64 is located between the two first sealing portions 61, and the first sealing portion 61 cooperates with the outer wall of the air sealing ring 5; a plurality of axially arranged first grooves 51 are provided on the outer wall of the air sealing ring 5, and the plurality of second sealing portions 64 correspond one-to-one to the plurality of first grooves 51, and the second sealing portions 64 extend into the first grooves 51; a plurality of third sealing portions 65 correspond one-to-one to the plurality of second sealing portions 64, and the plurality of second sealing portions 64 and the plurality of third sealing portions 65 are alternately arranged, and the third sealing portions 65 cooperate with the outer wall of the air sealing ring 5.

[0046] Further preferably, the first sealing portion 61 includes at least two first sealing teeth protruding from the inner wall of the axial gas seal 6 .

[0047] Further preferably, the second sealing portion 64 includes at least one second sealing tooth protruding from the inner wall of the axial gas seal 6 .

[0048] To further enhance the sealing performance of the air seal structure, in this embodiment, the third sealing portion 65 includes a third sealing tooth 651, a fourth sealing tooth 6522, and a fifth sealing tooth 6531. The fourth sealing tooth 6522, the fifth sealing tooth 6531, and the third sealing tooth 651 are sequentially arranged and axially disposed. The third sealing tooth 651, the fourth sealing tooth 6522, and the fifth sealing tooth 6531 have different heights. This arrangement effectively changes the sealing path in the air seal, further enhancing the sealing performance of the air seal structure.

[0049] Further preferably, the fourth sealing teeth 6522 , the fifth sealing teeth 6531 and the third sealing teeth 651 are sequentially arranged from the low-pressure side to the high-pressure side.

[0050] Further preferably, the fourth sealing teeth 6522 and the fifth sealing teeth 6531 are clearance-fitted, and the fifth sealing teeth 6531 and the third sealing teeth 651 are tight-fitted.

[0051] Further preferably, the height of the fourth sealing tooth 6522 is lower than that of the third sealing tooth 651 , and the height of the third sealing tooth 651 is lower than that of the fifth sealing tooth 6531 .

[0052] More preferably, Figure 4 As shown, the fourth sealing tooth 6522 is provided on the first sealing member 652, and the fifth sealing tooth 6531 is provided on the second sealing member 653. Both the first sealing member 652 and the second sealing member 653 are engaged with the axial gas seal 6. Specifically, a second groove 62 is provided on the inner wall of the axial gas seal 6, a first engaging portion 63 protrudes from the inner wall of the second groove 62, a second engaging portion 6521 protrudes from the first sealing member 652, and the second sealing member 653 is bent to form a fifth sealing tooth 6531 and a locking portion. The second engaging portion 6521 and the locking portion are located within the second groove 62, and the second engaging portion 6521 is located between the first engaging portion 63 and the positioning portion. The positioning portion and the fifth sealing tooth 6531 respectively abut against the inner wall of the second groove 62 opposite to each other, thereby fixing the first sealing member 652 to the axial gas seal 6.

[0053] Further preferably, the second sealing teeth are provided on the first clamping portion 63 .

[0054] In this embodiment, Figure 4 As shown, in the cross section of the first sealing tooth, the end surface of the first sealing tooth facing away from the rotating member 1 is a straight surface, and the end surface of the first sealing tooth facing the rotating member 1 includes a first inclined surface, a first curved surface and a first straight surface arranged in sequence from the inside to the outside; in the cross section of the second sealing tooth, the end surface of the first sealing tooth facing away from the rotating member 1 is vertical, and the end surface of the second sealing tooth facing the rotating member 1 includes a second inclined surface, a second curved surface and a second straight surface arranged in sequence from the inside to the outside; in the cross section of the third sealing tooth 651, the end surface of the third sealing tooth facing away from the rotating member 1 is vertical, and the end surface of the third sealing tooth facing the rotating member 1 includes a third inclined surface, a third curved surface and a third straight surface arranged in sequence from the inside to the outside; in the cross section of the fourth sealing tooth 6522, the end surface of the fourth sealing tooth facing away from the rotating member 1 includes a fourth inclined surface, a fourth curved surface and a fourth straight surface arranged in sequence from the inside to the outside, and the end surface of the fourth sealing tooth facing the rotating member 1 is vertical; the cross section of the fifth sealing tooth 6531 is rectangular. Such an arrangement can change the air passage of the labyrinth sealing structure, thereby improving the air tightness of the labyrinth sealing structure.

[0055] In this embodiment, Figure 2 、 Figure 3 、 Figure 5 and Figure 7 As shown, the end surface of the rotating member 1 facing the transmission shaft 2 is a radial sealing surface 11, which is provided with a third groove 12. One end of the gas sealing ring 5 extends into the third groove 12, and the gas sealing ring 5 cooperates with the third groove 12 to form a sealing structure. This arrangement can seal between the transmission shaft 2 and the rotating member 1, further improving the sealing performance of the pivot assembly.

[0056] In this embodiment, Figure 4 and Figure 6As shown, the radial seal assembly includes a radial gas seal 8, which is fixed to the axial gas seal 6. Sixth and seventh sealing teeth 81, 82 are provided on the radial gas seal 8. The sixth and seventh sealing teeth 81, 82 are arranged alternately. The sixth sealing teeth 81 cooperate with the radial sealing surface 11 of the rotating member 1 to form a sealing structure. The radial sealing surface 11 is also provided with a fourth groove 13. One end of the seventh sealing tooth 82 extends into the fourth groove 13. The seventh sealing tooth 82 cooperates with the inner wall of the fourth groove 13 to form a sealing gap. This arrangement can further improve the sealing performance of the pivot assembly.

[0057] More preferably, Figure 6 As shown, a fifth inclined surface is provided on the end of the sixth sealing tooth 81 that cooperates with the rotating member 1, and the fifth inclined surface is provided on the end surface of the sixth sealing tooth 81 facing away from the transmission shaft 2; a sixth inclined surface is provided on the end of the seventh sealing tooth 82 that cooperates with the rotating member 1, and the sixth inclined surface is provided on the end surface of the seventh sealing tooth 82 facing away from the transmission shaft 2.

[0058] More preferably, Figure 6 As shown, the length of the sixth sealing tooth 81 is shorter than that of the seventh sealing tooth 82 .

[0059] More preferably, Figure 2 As shown, there is at least one fourth groove 13, and at least one seventh sealing tooth 82 is disposed in each fourth groove 13; at least one seventh sealing tooth 82 extends into the third groove. With this arrangement, the radial gas seal 8 can seal the portion between the gas seal ring 5 and the rotating member 1, thereby further improving the airtightness of the sealing structure.

[0060] In order to fix the radial gas seal 8 on the axial gas seal 6, in this embodiment, as shown in FIG. Figure 2 and Figure 6 As shown, a threaded hole 64 is provided on the end face of the radial gas seal 8 facing away from the rotating member 1, and a stepped through hole 66 is provided on the end face of the axial gas seal 6 facing away from the rotating member 1. The threaded portion of the bolt 9 passes through the stepped through hole 66 and is threadedly connected with the threaded hole 64 of the radial gas seal 8. The head of the bolt 9 is restricted in the stepped through hole 66 by the stepped surface in the stepped through hole 66.

[0061] In order to facilitate the positioning between the radial gas seal 8 and the axial gas seal 6, in this embodiment, as shown in FIG. Figure 3 As shown, a second groove is provided on the end surface of the axial gas seal 6 facing the rotating member 1 , and a radial gas seal 8 is provided in the second groove. A sealing ring 10 is provided between the second groove and the radial gas seal 8 .

[0062] Further preferably, a first sealing groove is provided on the inner wall of the second slot, and a sealing ring is provided in the first sealing groove.

[0063] Further preferably, the second slot is communicated with the inner cavity of the axial gas seal 6, such as Figure 5 As shown, a fifth groove 52 is provided on the outer wall of the gas sealing ring 5. Figure 6 As shown, a fourth sealing portion 83 is protruded from the inner wall of the radial gas seal 8 , and the fourth sealing portion 83 cooperates with the inner wall of the fifth groove 52 to form a sealing structure.

[0064] In this embodiment, Figure 2 and Figure 3 As shown, an oil seal 7 is provided between the transmission shaft 2 and the housing 3, and the oil seal 7 is provided on the high-pressure side of the pivot assembly. This arrangement can effectively improve the sealing performance of the pivot assembly.

[0065] Further preferably, a second locking protrusion 33 is provided on the interior of the box body 3 , and a third locking groove is provided on the outer wall of the oil seal 7 .

[0066] More preferably, the oil seal 7 is a non-contact oil seal 7 .

[0067] In this embodiment, Figure 2 and Figure 3 As shown, a sliding bearing 4 is disposed between the rotating shaft and the housing 3. A lubricating oil passage 41 is provided in the middle of the sliding bearing 4. The housing 3 is provided with an oil inlet 35 connected to the lubricating oil passage 41. The sliding bearing 4 is disposed on the high-pressure side of the pivot assembly. This arrangement provides stability for the transmission shaft 2.

[0068] Further preferably, a third locking protrusion 34 is provided on the box body 3, and a fourth locking groove is provided on the sliding bearing 4, and the third locking protrusion 34 and the fourth locking groove are locked together.

[0069] Further preferably, the oil seal 7 is provided between the sliding bearing 4 and the vent hole 31 .

[0070] In order to facilitate the installation of the oil seal 7, the air seal and the sliding bearing 4, in this embodiment, as shown in FIG. Figure 2 and Figure 7 As shown, the transmission shaft 2 includes a first mounting portion 21, a second mounting portion 22, and a third mounting portion 23, which are arranged in sequence. The outer diameters of the first mounting portion 21, the second mounting portion 22, and the third mounting portion 23 decrease in order. The gas seal ring 5 is mounted on the first mounting portion 21, the oil seal 7 is mounted on the second mounting portion 22, and the sliding bearing 4 is mounted on the third mounting portion 23. This arrangement forms a stepped oil passage through the outer shape of the transmission shaft 2, effectively preventing movement of the low-pressure side of the oil tank on the side of the sliding bearing 4, thereby improving the sealing performance of the pivot assembly.

[0071] Further preferably, a first positioning portion 24 is protruded from the first mounting portion 21, the second mounting portion 22 is disposed on the second positioning portion 25, the gas seal ring 5 is disposed between the first positioning portion 24 and the rotating member 1, and the oil seal 7 is disposed between the first positioning portion 24 and the second positioning portion 25. This arrangement can limit the stability of the positions of the gas seal ring 5 and the oil seal 7.

[0072] In this embodiment, the rotating member 1 is an impeller. In other embodiments, the rotating member 1 can also be a fan blade, a gear or a propeller.

[0073] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0074] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.

Claims

1. A high-speed labyrinth contact gas seal, characterized by: Used to seal the low-pressure side and the high-pressure side of a pivot assembly, the pivot assembly comprising a housing (3), a transmission shaft (2) and a rotating member (1); a vent hole (31) communicating with an inner cavity of the housing (3) is provided on an outer wall of the housing (3); the transmission shaft (2) is rotatably mounted in the housing (3); and the rotating member (1) is fixed to one end of the rotating shaft extending out of the housing (3); In the pivot assembly, the two sides of the vent hole (31) are respectively a low-pressure side and a high-pressure side; the side where the rotating member (1) is installed is the low-pressure side, and the other side is the high-pressure side; An axial sealing assembly is provided between the housing (3) and the transmission shaft (2), and a radial sealing assembly is provided between the housing (3) and the rotating member (1). Both the axial sealing assembly and the radial sealing assembly are provided on the low-pressure side of the pivot assembly.

2. The high-speed labyrinth contact gas seal according to claim 1, characterized in that: The axial sealing assembly comprises an air seal ring (5) and an axial air seal (6); the air seal ring (5) is sleeved on the transmission shaft (2), the air seal ring (5) and the transmission shaft (2) are tightly matched, the axial air seal (6) is sleeved on the air seal ring (5), the axial air seal (6) is fixedly connected to the box body (3), and a labyrinth sealing structure is provided between the axial air seal (6) and the air seal ring (5).

3. The high-speed labyrinth contact gas seal according to claim 2, characterized in that: The labyrinth seal structure comprises a first sealing portion (61), a second sealing portion (64) and a third sealing portion (65) arranged on the axial gas seal (6), wherein the first sealing portion (61), the second sealing portion (64) and the third sealing portion (65) all protrude from the inner wall of the axial gas seal (6); The second sealing portion (64) is located between the two first sealing portions (61), and the first sealing portion (61) cooperates with the outer wall of the air sealing ring (5); a plurality of axially arranged first grooves (51) are provided on the outer wall of the air sealing ring (5), the plurality of second sealing portions (64) correspond one-to-one to the plurality of first grooves (51), and the second sealing portions (64) extend into the first grooves (51); The plurality of third sealing parts (65) and the plurality of second sealing parts (64) correspond one to one, the plurality of second sealing parts (64) and the plurality of third sealing parts (65) are arranged alternately, and the third sealing parts (65) cooperate with the outer wall of the air sealing ring (5).

4. The high-speed labyrinth contact gas seal according to claim 3, characterized in that: The third sealing portion (65) includes a third sealing tooth (651), a fourth sealing tooth (6522) and a fifth sealing tooth (6531). The fourth sealing tooth (6522), the fifth sealing tooth (6531) and the third sealing tooth (651) are arranged in sequence and axially. The third sealing tooth (651), the fourth sealing tooth (6522) and the fifth sealing tooth (6531) have different heights.

5. The high-speed labyrinth contact gas seal according to claim 4, characterized in that: The fourth sealing tooth (6522), the fifth sealing tooth (6531) and the third sealing tooth (651) are arranged in sequence from the low-pressure side to the high-pressure side.

6. The high-speed labyrinth contact gas seal according to claim 4, characterized in that: The fourth sealing tooth (6522) and the fifth sealing tooth (6531) are clearance-fitted, and the fifth sealing tooth (6531) and the third sealing tooth (651) are tight-fitted.

7. The high-speed labyrinth contact gas seal according to claim 4, characterized in that: The height of the fourth sealing tooth (6522) is lower than that of the third sealing tooth (651), and the height of the third sealing tooth (651) is lower than that of the fifth sealing tooth (6531).

8. The high-speed labyrinth contact gas seal according to claim 1, characterized in that: The end surface of the rotating member (1) facing the transmission shaft (2) is a radial sealing surface (11), a third groove (12) is provided on the radial sealing surface (11), one end of the air sealing ring (5) extends into the third groove (12), and the air sealing ring (5) cooperates with the third groove (12) to form a sealing structure.

9. The high-speed labyrinth contact gas seal according to claim 8, characterized in that: The radial sealing assembly includes a radial air seal (8), which is fixed on the axial air seal (6). A sixth sealing tooth (81) and a seventh sealing tooth (82) are provided on the radial air seal (8), and the sixth sealing tooth (81) and the seventh sealing tooth (82) are alternately provided. The sixth sealing tooth (81) cooperates with the radial sealing surface (11) of the rotating member (1) to form a sealing structure. A fourth groove (13) is also provided on the radial sealing surface (11), and one end of the seventh sealing tooth (82) extends into the fourth groove (13). The seventh sealing tooth (82) cooperates with the inner wall of the fourth groove (13) to form a sealing gap.

10. The high-speed labyrinth contact gas seal according to claim 9, characterized in that: The length of the sixth sealing tooth (81) is shorter than that of the seventh sealing tooth (82).

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