Linear high pressure dynamic seal articulation

Abstract

The application belongs to the technical field of mechanical seal structure, and discloses a linear high-pressure dynamic seal movable joint. According to the medium flow direction, the linear high-pressure dynamic seal movable joint comprises a square column-shaped front profile and a square column-shaped rear profile connected in sequence from front to back; the rear end of the front profile is provided with a rotating shaft, and the front end of the rear profile is provided with a labyrinth head in the form of a circular tube matched with the rotating shaft, the labyrinth head being embedded into the rear end of the front profile; the rear profile rotates around the rotating shaft, the outer circular arc surface of the labyrinth head is located between the front profile and the rear profile, and the front profile and the rear profile are smoothly connected through the labyrinth head; the linear high-pressure dynamic seal movable joint adopts a rotating shaft-oil seal dynamic seal structure or a rotating shaft-sealing strip dynamic seal structure. The linear high-pressure dynamic seal movable joint realizes the dynamic sealing requirement in the movement process of the inner profile of the square cavity through the structure form of the rotating shaft combined with the linear seal, realizes the variable cross-sectional area of the flow channel in the square cavity, and further realizes the control of the flow and pressure and other related parameters of the medium in the square cavity.

Description

Technical Field

[0001] This invention belongs to the field of mechanical seal structure technology, specifically relating to a linear high-pressure dynamic seal movable joint. Background Technology

[0002] Existing dynamic sealing joints are mostly plunger or ball-head structures, which cannot achieve rectangular space sealing and are difficult to change the diameter or cross-sectional area of ​​the cavity flow channel, thus greatly limiting their application scenarios.

[0003] Multi-stage linear high-pressure dynamic seal joints can achieve rectangular space sealing and also allow for changes in the diameter or cross-sectional area of ​​the cavity flow channel. However, as pressure levels continue to increase, limitations in cost, processing, and assembly precision make it difficult for multi-stage linear high-pressure dynamic seal joints to meet high-pressure dynamic sealing requirements.

[0004] Currently, there is an urgent need to develop a linear high-pressure dynamic seal movable joint that can meet the requirements of high-pressure dynamic seals. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a linear high-pressure dynamic sealing movable joint to overcome the defects of the prior art.

[0006] The linear high-pressure dynamic seal movable joint of the present invention is characterized in that the linear high-pressure dynamic seal movable joint is used in a square cavity within a square housing; according to the medium flow direction, the linear high-pressure dynamic seal movable joint includes a front profile and a rear profile connected sequentially from front to back in the shape of square columns; a rotating shaft is provided at the rear end of the front profile, and a circular tube-shaped labyrinth head matching the rotating shaft is provided at the front end of the rear profile, with a fan-shaped opening matching the rotation angle on the labyrinth head; the labyrinth head is embedded in the rear end of the front profile; the rear profile rotates around the rotating shaft, and the outer arc surface of the labyrinth head is located between the front profile and the rear profile, with the front profile and the rear profile smoothly transitioning through the labyrinth head; the rotation angle range of the labyrinth head is 0°~α, where α is determined according to the maximum cross-sectional area of ​​the flow channel within the square cavity; Dynamic sealing grooves are provided on both the left and right sides of the front and rear profiles, and sealing strips are installed in the dynamic sealing grooves to achieve dynamic sealing between the front and rear profiles and the square shell.

[0007] Furthermore, the linear high-pressure dynamic seal movable joint adopts a shaft-oil seal dynamic seal structure. An oil reservoir I parallel to the central axis of the shaft is provided on the arc surface of the front profile that contacts the labyrinth head. An oil injection hole I is opened on the oil reservoir I. The oil injection hole I is connected to a grease supply system. The grease supply system adds lubricating oil or grease through the oil injection hole I. Alternatively, a shaft-seal strip dynamic seal structure is adopted. A shaft sealing groove parallel to the central axis of the shaft is provided on the arc surface of the front profile that contacts the labyrinth head. A shaft sealing strip is installed in the shaft sealing groove.

[0008] Furthermore, the aforementioned linear high-pressure dynamic seal movable joint adopts a shaft-oil seal dynamic seal structure. An oil reservoir II parallel to the central axis of the shaft is provided on the arc surface of the rear profile that contacts the shaft. An oil injection hole II is opened on the oil reservoir II. The oil injection hole II is connected to a grease supply system, and the grease supply system adds lubricating oil or grease through the oil injection hole II. Alternatively, a shaft-seal strip dynamic seal structure is adopted, with a shaft seal groove parallel to the central axis of the shaft provided on the rear profile. A shaft seal strip is installed in the shaft seal groove.

[0009] Furthermore, a motor is provided on the rotating shaft or the rear profile, and the motor drives the rear profile to rotate around the rotating shaft.

[0010] Furthermore, the medium is a gas or a liquid.

[0011] For a shaft-oil seal dynamic seal structure, one or more oil injection holes and oil reservoirs are opened on the front and rear profiles according to the sealing grade and sealing requirements. Lubricating oil or grease is filled between the contact surfaces to increase the sealing pressure grade. The sealing pressure range of the shaft-oil seal dynamic seal structure is 0~6.3MPa.

[0012] For the shaft-seal strip dynamic seal structure, one or more sealing strips can be used for sealing, depending on the actual pressure rating requirements. While meeting the pressure rating of the dynamic seal, this significantly reduces machining precision and difficulty, resulting in cost reduction and efficiency improvement. It can be used in low-speed equipment with lower precision requirements. The sealing pressure range of the shaft-seal strip dynamic seal structure is 0~10MPa.

[0013] The shaft-oil seal dynamic sealing structure and the shaft-seal strip dynamic sealing structure can be used alone or in combination.

[0014] The linear high-pressure dynamic seal movable joint of the present invention achieves the dynamic sealing requirements during the movement of the inner surface of the square cavity through the structure of the rotating shaft combined with the linear seal, realizes the variable cross-sectional area of ​​the flow channel in the square cavity, and thus realizes the control of the flow rate and pressure and other related parameters of the medium in the square cavity.

[0015] The linear high-pressure dynamic seal movable joint of the present invention ensures a smooth transition between the front and rear surfaces while varying the cross-sectional area, reducing flow resistance; it can also reduce the processing and assembly precision to varying degrees while achieving high-pressure dynamic sealing, making it suitable for high-pressure vessels with variable cross-sectional area requirements. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the linear high-pressure dynamic seal movable joint structure of the present invention; Figure 2aThis is a schematic diagram (three-dimensional view) of the rotating shaft-oil seal dynamic seal structure in the linear high-pressure dynamic seal movable joint of the present invention. Figure 2b This is a schematic diagram (front view) of the rotating shaft-oil seal dynamic seal structure in the linear high-pressure dynamic seal movable joint of the present invention. Figure 2c This is a schematic diagram of the front profile of the rotating shaft-oil seal dynamic seal structure in the linear high-pressure dynamic seal movable joint of the present invention. Figure 2d This is a schematic diagram of the rear profile of the rotating shaft-oil seal dynamic seal structure in the linear high-pressure dynamic seal movable joint of the present invention. Figure 3 This is a schematic diagram (three-dimensional view) of the rotating shaft-sealing strip dynamic sealing structure in the linear high-pressure dynamic seal movable joint of the present invention.

[0017] In the figure, 1. Square shell; 2. Front surface; 3. Rear surface; 4. Cavity dynamic sealing groove; 5. Oil injection hole I; 6. Oil reservoir I; 7. Oil injection hole II; 8. Oil reservoir II; 9. Shaft sealing strip; 10. Shaft. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 , Figure 2a , Figure 2b , Figure 2c , Figure 2d , Figure 3 As shown, the linear high-pressure dynamic seal movable joint of the present invention is characterized in that the linear high-pressure dynamic seal movable joint is used in a square cavity within a square housing 1; according to the medium flow direction, the linear high-pressure dynamic seal movable joint includes a front profile 2 and a rear profile 3 connected sequentially from front to back in a square column shape; a rotating shaft 10 is provided at the rear end of the front profile 2, and a circular tube-shaped labyrinth head matching the rotating shaft 10 is provided at the front end of the rear profile 3, with a fan-shaped opening matching the rotation angle provided on the labyrinth head; the labyrinth head is embedded in the rear end of the front profile 2; the rear profile 3 rotates around the rotating shaft 10, and the outer arc surface of the labyrinth head is located between the front profile 2 and the rear profile 3, with the front profile 2 and the rear profile 3 smoothly transitioning through the labyrinth head; the rotation angle range of the labyrinth head is 0°~α, where α is determined according to the maximum cross-sectional area of ​​the flow channel within the square cavity; A cavity dynamic sealing groove 4 is provided on both the left and right sides of the front surface 2 and the rear surface 3. A sealing strip is installed in the cavity dynamic sealing groove 4 to achieve dynamic sealing between the front surface 2 and the rear surface 3 and the square shell 1.

[0020] Furthermore, the linear high-pressure dynamic seal movable joint adopts a shaft-oil seal dynamic seal structure. An oil reservoir I6 parallel to the central axis of the shaft 10 is provided on the arc surface of the front profile 2 that contacts the labyrinth head. An oil injection hole I5 is opened on the oil reservoir I6. The oil injection hole I5 is connected to a grease supply system, and the grease supply system adds lubricating oil or grease through the oil injection hole I5. Alternatively, a shaft-seal strip dynamic seal structure is adopted. A shaft sealing groove parallel to the central axis of the shaft 10 is provided on the arc surface of the front profile 2 that contacts the labyrinth head. A shaft sealing strip 9 is installed in the shaft sealing groove.

[0021] Furthermore, the aforementioned linear high-pressure dynamic seal movable joint adopts a shaft-oil seal dynamic seal structure. An oil reservoir II8 parallel to the central axis of the shaft 10 is provided on the arc surface of the rear profile 3 that contacts the shaft 10. An oil injection hole II7 is opened on the oil reservoir II8. The oil injection hole II7 is connected to a grease supply system, and the grease supply system adds lubricating oil or grease through the oil injection hole II7. Alternatively, a shaft-seal strip dynamic seal structure is adopted, in which a shaft sealing groove parallel to the central axis of the shaft 10 is provided on the rear profile 3, and a shaft sealing strip 9 is installed in the shaft sealing groove.

[0022] Furthermore, a motor is provided on the rotating shaft 10 or the rear profile 3, and the motor drives the rear profile 3 to rotate around the rotating shaft 10.

[0023] Furthermore, the medium is a gas or a liquid.

[0024] Example 1:

[0025] In this embodiment, the linear high-pressure dynamic seal movable joint adopts a shaft-oil seal dynamic seal structure for use in an adjustable intake engine model. The incoming (working) medium is air, enabling continuous adjustment of the throat height of the two-dimensional rectangular intake. When the engine model is working, the internal cavity pressure is 0.2MPa~1MPa, and the intake throat height adjustment range is 10mm~80mm. The shaft-oil seal dynamic seal structure can achieve continuous adjustment of the intake throat height while reliably sealing and preventing leakage.

[0026] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. For those skilled in the art, all features disclosed in the present invention, or all steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any way without departing from the principles of the present invention. The present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A linear high-pressure dynamic sealing movable joint, characterized in that, The linear high-pressure dynamic seal movable joint is used in the square cavity inside the square shell (1); according to the direction of medium flow, the linear high-pressure dynamic seal movable joint includes a square columnar front surface (2) and a rear surface (3) connected sequentially from front to back; a rotating shaft (10) is provided at the rear end of the front surface (2), and a circular tube-shaped labyrinth head matching the rotating shaft (10) is provided at the front end of the rear surface (3), and a fan-shaped opening matching the rotation angle is provided on the labyrinth head; the labyrinth head is embedded in the rear end of the front surface (2); the rear surface (3) rotates around the rotating shaft (10), and the outer arc surface of the labyrinth head is located between the front surface (2) and the rear surface (3), and the front surface (2) and the rear surface (3) are smoothly transitioned through the labyrinth head; the rotation angle range of the labyrinth head is 0°~α, and α is determined according to the maximum cross-sectional area of ​​the flow channel inside the square cavity; A cavity dynamic sealing groove (4) is provided on both the left and right sides of the front surface (2) and the rear surface (3). A sealing strip is installed in the cavity dynamic sealing groove (4) to achieve dynamic sealing between the front surface (2) and the rear surface (3) and the square shell (1). The linear high-pressure dynamic seal movable joint adopts a shaft-oil seal dynamic seal structure. On the arc surface of the front profile (2) that contacts the labyrinth head, there is an oil reservoir I (6) parallel to the central axis of the shaft (10). An oil injection hole I (5) is opened on the oil reservoir I (6). The oil injection hole I (5) is connected to a grease supply system. The grease supply system adds lubricating oil or grease through the oil injection hole I (5). Alternatively, a shaft-seal strip dynamic seal structure is adopted. On the arc surface of the front profile (2) that contacts the labyrinth head, there is a shaft sealing groove parallel to the central axis of the shaft (10). A shaft sealing strip (9) is installed in the shaft sealing groove.

2. The linear high-pressure dynamic sealing movable joint according to claim 1, characterized in that, The linear high-pressure dynamic seal movable joint adopts a shaft-oil seal dynamic seal structure. On the arc surface of the rear profile (3) that contacts the shaft (10), there is an oil reservoir II (8) parallel to the central axis of the shaft (10). An oil injection hole II (7) is opened on the oil reservoir II (8). The oil injection hole II (7) is connected to a grease supply system. The grease supply system adds lubricating oil or grease through the oil injection hole II (7). Alternatively, a shaft-seal strip dynamic seal structure is adopted. On the rear profile (3), there is a shaft seal groove parallel to the central axis of the shaft (10). A shaft seal strip (9) is installed in the shaft seal groove.

3. The linear high-pressure dynamic sealing movable joint according to claim 1, characterized in that, A motor is provided on the rotating shaft (10) or the rear profile (3), and the motor drives the rear profile (3) to rotate around the rotating shaft (10).

4. A linear high-pressure dynamic sealing movable joint according to claim 1, characterized in that, The medium is either a gas or a liquid.

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