Full-contact gas seal oil dam for steam turbine

Abstract

This utility model discloses a full-contact gas-tight oil baffle for a steam turbine, relating to the field of gas-tight oil baffle technology. The full-contact gas-tight oil baffle for the steam turbine includes an upper full-contact seat and a lower full-contact seat disposed at the bottom of the upper full-contact seat. A gas-tight auxiliary seat ring is fixedly connected to one side of both the upper and lower full-contact seats. It also includes: an air inlet connector disposed at the top of the gas-tight auxiliary seat ring, with a positioning plate sleeved inside the air inlet connector. A telescopic assembly is fixedly connected to the bottom of the positioning plate, the telescopic assembly including a telescopic spring and a piston; and a support assembly disposed at the bottom of the upper full-contact seat, the support assembly including a support spring and a positioning rod. This utility model, through the setting of the telescopic assembly, ensures that the sealing system can maintain effective sealing during start-up, shutdown, or fluctuations in the gas supply, reducing the risk of lubricating oil leakage, extending equipment life, and simultaneously reducing mechanical wear between the oil baffle teeth and the rotating shaft caused by gas pressure imbalance.

Description

Technical Field

[0001] This utility model relates to the field of gas-tight oil baffle technology, specifically a full-contact gas-tight oil baffle for a steam turbine. Background Technology

[0002] Full-contact gas-tight oil baffles are commonly used in high-end mechanical equipment such as steam turbines to ensure system sealing and prevent oil leakage. Their working principle and design concept involve using a combination of mechanical and airflow techniques to create an effective sealing barrier, preventing oil from leaking or evaporating under high temperature and pressure conditions, thereby maintaining the stability and safety of the equipment. Full-contact gas-tight oil baffles primarily prevent oil leakage through sealing rings, oil-blocking structures, and gas pressure.

[0003] Utility model patent CN223104641U discloses an airtight mechanical seal oil baffle for steam turbines. This airtight mechanical seal oil baffle for steam turbines includes a bearing housing and a sealing structure. The bearing housing houses a bearing, and the sealing structure is located inside the bearing housing. The sealing structure includes a stationary ring, a rotating ring, a first O-ring, a second O-ring, a stationary ring vent, and a rotating ring locking screw hole. The stationary ring is fixedly connected inside the bearing housing, and the rotating ring is engaged with the stationary ring. The stationary ring vent is located on the surface of the stationary ring, and the rotating ring locking screw hole is located inside the rotating ring. The formation of the sealed air chamber prevents water from flowing into the stationary ring when the first O-ring is not sealing properly, and prevents negative pressure inside the bearing housing from drawing back into the bearing housing lubricating oil. The positive pressure inside the oil baffle prevents lubricating oil from leaking out of the bearing housing, effectively preventing water ingress or overflow of lubricating oil.

[0004] However, the existing full-contact gas-tight oil baffle of steam turbines cannot ensure that the sealing system can maintain an effective seal during start-up, shutdown or gas source fluctuations, which increases the risk of lubricating oil leakage. At the same time, gas pressure imbalance can easily lead to mechanical wear between the oil baffle teeth and the rotating shaft, shortening the service life of the oil baffle. Utility Model Content

[0005] This invention provides a full-contact gas-tight oil baffle for steam turbines, which has the advantage of maintaining an effective seal during start-up, shutdown, or gas source fluctuations. This solves the problem that existing full-contact gas-tight oil baffles for steam turbines cannot ensure that the sealing system maintains an effective seal during start-up, shutdown, or gas source fluctuations, increasing the risk of lubricating oil leakage. At the same time, gas pressure imbalance can easily lead to mechanical wear between the oil baffle teeth and the rotating shaft, shortening the service life of the oil baffle.

[0006] To ensure the sealing system maintains effective sealing during start-up, shutdown, or fluctuations in the gas supply, this utility model provides the following technical solution: a full-contact gas-tight oil baffle for a steam turbine, comprising an upper full-contact seat and a lower full-contact seat located at the bottom of the upper full-contact seat. A gas-tight auxiliary seat ring is fixedly connected to one side of both the upper and lower full-contact seats. The system further includes: an air inlet connector located at the top of the gas-tight auxiliary seat ring, with a positioning disc sleeved inside the air inlet connector. A telescopic assembly is fixedly connected to the bottom of the positioning disc, the telescopic assembly including a telescopic spring and a piston; a support assembly located at the bottom of the upper full-contact seat, the support assembly including a support spring and a positioning rod, wherein an L-shaped sealing strip is fixedly connected to the bottom of one set of support springs, and a straight sealing strip is fixedly connected to the bottom of the other set of support springs; and a groove located at the top of the lower full-contact seat, with the L-shaped sealing strip and the straight sealing strip engaged inside the groove.

[0007] As a preferred embodiment of this utility model, the telescopic component includes a telescopic spring fixedly connected to the bottom of the positioning plate, and a piston is fixedly connected to the bottom end of the telescopic spring.

[0008] As a preferred embodiment of the present invention, the support assembly includes a support spring disposed at the bottom of the upper full contact seat, and a positioning rod is sleeved inside the support spring.

[0009] As a preferred embodiment of this invention, a sliding rod is fixedly connected to the top of the piston, and the sliding rod is slidably connected to the inside of the positioning plate.

[0010] As a preferred embodiment of this utility model, several sets of fixing springs are fixedly connected inside the upper full contact seat, the lower full contact seat, and the gas-tight secondary seat ring, and rubber strips are fixedly connected to the bottom of the L-shaped sealing strip and the straight sealing strip.

[0011] As a preferred embodiment of this utility model, one end of the fixed spring is fixedly connected to an oil baffle slider, and two sets of oil baffle teeth are fixedly connected inside the oil baffle slider.

[0012] As a preferred embodiment of this utility model, grooves are provided on both sides of the upper and lower full contact seats, and threaded holes are provided inside the grooves. A connecting bolt passes through the threaded holes, and a limit nut is threaded to one end of the connecting bolt.

[0013] As a preferred technical solution of this utility model, a stationary ring is sleeved on the inner wall of one side of the upper full contact seat and the lower full contact seat, and a number of threaded holes are opened on the surface of the upper full contact seat and the internal threads of the threaded holes are connected to fixing bolts.

[0014] Compared with the prior art, this utility model provides a full-contact gas-tight oil baffle for a steam turbine, which has the following advantages: The turbine's fully contact gas-tight oil baffle, through the telescopic component, allows gas to enter the gas-tight sub-sealing ring through the air inlet connector during operation. The gas then passes through the through hole on the positioning plate, pushing the piston and entering further. The gas pressure then blocks the tiny gap between the oil baffle teeth and the rotating shaft. When the gas source is unstable or stops, the internal gas pressure of the gas-tight sub-sealing ring becomes unstable. The elastic force generated by the deformation of the telescopic spring under pressure balances the internal and external gas pressure, thus ensuring that the sealing system can maintain an effective seal during start-up, shutdown, or gas source fluctuations. This reduces the risk of lubricating oil leakage, extends equipment life, and reduces mechanical wear between the oil baffle teeth and the rotating shaft caused by gas pressure imbalance.

[0015] The turbine's full-contact gas-tight oil baffle, through the arrangement of support components, L-shaped sealing strips, and straight sealing strips, is installed by aligning the upper and lower full-contact seats. The L-shaped and straight sealing strips are then inserted into the grooves on the top surface of the lower full-contact seat, causing the sealing strips to compress the support spring. The support spring deforms under pressure, generating elastic force that pushes the sealing strips in the opposite direction. Simultaneously, the rubber strips enhance the sealing performance. Finally, connecting bolts and limit nuts are used for secure installation, thereby increasing the sealing performance at the joint between the upper and lower full-contact seats, compensating for gap changes caused by temperature or vibration, and reducing leakage paths. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the disassembled structure of this utility model; Figure 3 This is a schematic diagram of the telescopic component structure of this utility model; Figure 4 This is a schematic diagram of the support assembly structure of this utility model. In the figure: 1. Upper full contact seat; 2. Lower full contact seat; 3. Gas-tight secondary seat ring; 4. Air inlet connector; 6. Positioning plate; 7. Telescopic assembly; 701. Telescopic spring; 702. Piston; 8. Support assembly; 801. Support spring; 802. Positioning rod; 9. L-shaped sealing strip; 10. Straight sealing strip; 11. Sliding rod; 12. Fixed spring; 13. Oil baffle slider; 14. Oil baffle tooth; 15. Connecting bolt; 16. Limiting nut; 17. Stationary ring; 18. Fixed bolt; 19. Rubber strip. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1-4 This utility model discloses a full-contact gas-tight oil baffle for a steam turbine, including an upper full-contact seat 1 and a lower full-contact seat 2 located at the bottom of the upper full-contact seat 1. A gas-tight sub-seat ring 3 is fixedly connected to one side of both the upper and lower full-contact seats 1 and 2. The model also includes: an air inlet connector 4 located at the top of the gas-tight sub-seat ring 3, with a positioning disc 6 sleeved inside the air inlet connector 4. A telescopic assembly 7 is fixedly connected to the bottom of the positioning disc 6, and the telescopic assembly 7 includes a telescopic spring 701 and a piston 702; a support assembly 8 located at the bottom of the upper full-contact seat 1, including a support spring 801 and a positioning rod 802. One set of support springs 801 has an L-shaped sealing strip 9 fixedly connected to its bottom, and the other set of support springs 801 has a straight sealing strip 10 fixedly connected to its bottom; and a groove located at the top of the lower full-contact seat 2, with the L-shaped sealing strip 9 and the straight sealing strip 10 engaged inside the groove.

[0019] Specifically, the telescopic component 7 includes a telescopic spring 701 fixedly connected to the bottom of the positioning disk 6, and a piston 702 fixedly connected to the bottom end of the telescopic spring 701.

[0020] In this embodiment, gas passes through the through hole on the positioning plate 6, thereby pushing the piston 702 and entering, and then using the air pressure to block the tiny gap between the oil stop tooth 14 and the rotating shaft. When the air source is unstable or stops, the air pressure inside the air seal sub-seat ring 3 is unstable. The elastic force generated by the deformation of the extension spring 701 under pressure balances the internal and external air pressure.

[0021] Specifically, the support assembly 8 includes a support spring 801 disposed at the bottom of the upper full contact seat 1, and a positioning rod 802 is sleeved inside the support spring 801.

[0022] In this embodiment, the L-shaped sealing strip 9 and the straight sealing strip 10 are then inserted into the groove on the top surface of the lower full contact seat 2, causing the sealing strip to compress the support spring 801. The support spring 801 deforms under force to generate elastic force, which pushes the sealing strip in the opposite direction.

[0023] Specifically, a sliding rod 11 is fixedly connected to the top of the piston 702, and the sliding rod 11 is slidably connected to the inside of the positioning plate 6.

[0024] In this embodiment, the sliding rod 11 slides within the positioning plate 6 to ensure that the piston 702 moves only axially and to prevent uneven wear.

[0025] Specifically, several sets of fixing springs 12 are fixedly connected inside the upper full contact seat 1, the lower full contact seat 2 and the gas-tight secondary seat ring 3, and rubber strips 19 are fixedly connected to the bottom of the L-shaped sealing strip 9 and the straight sealing strip 10.

[0026] In this embodiment, the elasticity of the fixed spring 12 supports the oil baffle slider 13 to adapt to the radial runout of the rotating shaft, and the rubber strip 19 increases the flexible sealing of the L-shaped sealing strip 9 and the straight sealing strip 10.

[0027] Specifically, one end of the fixed spring 12 is fixedly connected to the oil baffle slider 13, and two sets of oil baffle teeth 14 are fixedly connected inside the oil baffle slider 13.

[0028] In this embodiment, the elastic force of the fixed spring 12 causes the oil baffle slider 13 to adapt to the radial jump of the rotating shaft, maintaining uniform contact between the oil baffle teeth 14 and the shaft surface. The oil baffle teeth 14 form a labyrinthine oil baffle path, which, combined with the spring preload, prevents lubricating oil from leaking out.

[0029] Specifically, grooves are provided on both sides of the upper full contact seat 1 and the lower full contact seat 2. Threaded holes are provided inside the grooves, and connecting bolts 15 pass through the threaded holes. One end of the connecting bolts 15 is threadedly connected to a limit nut 16.

[0030] In this embodiment, the limiting nut 16 presses the upper full contact seat 1 and the lower full contact seat 2 together through the threaded hole, reducing the gap at the joint. The limiting nut 16 locks the connecting bolt 15 to prevent vibration from causing the bolt to loosen.

[0031] Specifically, a stationary ring 17 is fitted on the inner wall of one side of the upper full contact seat 1 and the lower full contact seat 2, and several sets of threaded holes are opened on the surface of the upper full contact seat 1 and the lower full contact seat 2, and fixing bolts 18 are connected to the internal threads of the threaded holes.

[0032] In this embodiment, the stationary ring 17 cooperates with the rotating ring of the shaft to form a second line of defense for non-contact gas sealing. The fixing bolt 18 facilitates the installation of the upper full contact seat 1 and the lower full contact seat 2 on the oil tank, making maintenance and replacement convenient.

[0033] The working principle and usage process of this utility model are as follows: During use, gas enters the gas-sealed sub-seat ring 3 through the air inlet connector 4. The gas passes through the through hole on the positioning plate 6, thereby pushing the piston 702 and entering. The gas pressure then blocks the tiny gap between the oil stop tooth 14 and the rotating shaft. When the gas source is unstable or stops, the gas pressure inside the gas-sealed sub-seat ring 3 becomes unstable. The elastic force generated by the deformation of the telescopic spring 701 under pressure balances the internal and external gas pressure. During installation, the upper full contact seat 1 and the lower full contact seat 2 are aligned. Then, the L-shaped sealing strip 9 and the straight sealing strip 10 are inserted into the groove on the top surface of the lower full contact seat 2, causing the sealing strip to squeeze the support spring 801. The support spring 801 deforms under force and generates elastic force, pushing the sealing strip in the opposite direction. At the same time, the rubber strip 19 increases the sealing performance. Finally, the connecting bolts 15 and the limit nut 16 are used for fixed installation.

[0034] In summary, the full-contact gas-tight oil baffle of this steam turbine, through the setting of the telescopic component 7, ensures that the sealing system can maintain an effective seal during start-up, shutdown, or gas source fluctuations, reducing the risk of lubricating oil leakage, extending equipment life, and reducing mechanical wear between the oil baffle teeth 14 and the rotating shaft caused by gas pressure imbalance. Through the setting of the support component 8, L-shaped sealing strip 9, and straight sealing strip 10, the sealing performance at the joint between the upper full-contact seat 1 and the lower full-contact seat 2 is increased, compensating for gap changes caused by temperature or vibration, and reducing leakage paths.

[0035] It should be noted that, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A full-contact gas-tight oil baffle for a steam turbine, comprising an upper full-contact seat (1) and a lower full-contact seat (2) disposed at the bottom of the upper full-contact seat (1), wherein a gas-tight auxiliary seat ring (3) is fixedly connected to one side of both the upper full-contact seat (1) and the lower full-contact seat (2), characterized in that, Also includes: An air inlet connector (4) is provided on the top of the air-tight sub-sealing ring (3). A positioning plate (6) is sleeved inside the air inlet connector (4). A telescopic assembly (7) is fixedly connected to the bottom of the positioning plate (6). The telescopic assembly (7) includes a telescopic spring (701) and a piston (702). A support assembly (8) is provided at the bottom of the upper full contact seat (1). The support assembly (8) includes a support spring (801) and a positioning rod (802). One set of the support springs (801) has an L-shaped sealing strip (9) fixedly connected to its bottom, and the other set of the support springs (801) has a straight sealing strip (10) fixedly connected to its bottom. The L-shaped sealing strip (9) and the straight sealing strip (10) are engaged inside the groove in the top of the lower full contact seat (2).

2. The fully contact gas-tight oil baffle for a steam turbine according to claim 1, characterized in that: The telescopic assembly (7) includes a telescopic spring (701) fixedly connected to the bottom of the positioning disk (6), and a piston (702) is fixedly connected to the bottom end of the telescopic spring (701).

3. The fully contact gas-tight oil baffle for a steam turbine according to claim 1, characterized in that: The support assembly (8) includes a support spring (801) disposed at the bottom of the upper full contact seat (1), and a positioning rod (802) is sleeved inside the support spring (801).

4. The fully contact gas-tight oil baffle for a steam turbine according to claim 1, characterized in that: The piston (702) is fixedly connected to a sliding rod (11) at its top, and the sliding rod (11) is slidably connected to the inside of the positioning plate (6).

5. The fully contact gas-tight oil baffle for a steam turbine according to claim 1, characterized in that: Several sets of fixing springs (12) are fixedly connected inside the upper full contact seat (1), the lower full contact seat (2) and the air-tight sub-seat ring (3), and rubber strips (19) are fixedly connected to the bottom of the L-shaped sealing strip (9) and the straight sealing strip (10).

6. The fully contact gas-tight oil baffle for a steam turbine according to claim 5, characterized in that: One end of the fixed spring (12) is fixedly connected to an oil baffle slider (13), and two sets of oil baffle teeth (14) are fixedly connected inside the oil baffle slider (13).

7. The fully contact gas-tight oil baffle for a steam turbine according to claim 1, characterized in that: The upper full contact seat (1) and the lower full contact seat (2) are provided with grooves on both sides, and the grooves are provided with threaded holes. A connecting bolt (15) passes through the threaded holes, and a limit nut (16) is threaded to one end of the connecting bolt (15).

8. The fully contact gas-tight oil baffle for a steam turbine according to claim 1, characterized in that: A stationary ring (17) is sleeved on the inner wall of one side of the upper full contact seat (1) and the lower full contact seat (2). Several sets of threaded holes are opened on the surface of the upper full contact seat (1) and the lower full contact seat (2). The internal threads of the threaded holes are connected to fixing bolts (18).

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