A pressure drop regulator for a gas turbine

Abstract

The application belongs to the field of gas turbines and relates to a pressure drop regulator applied to a gas turbine. The pressure drop regulator applied to the gas turbine comprises a bellows assembly, a valve assembly, a shell assembly, an adjusting screw, a reducing joint, a first spring and a screw with a seat, the bellows assembly is installed in the upper end of the shell assembly, the upper end of the screw with the seat is inserted into the bellows assembly through the bottom of the shell assembly, the valve assembly is installed in the bellows assembly, the reducing joint is installed in the upper end of the bellows assembly, the first spring is arranged at the upper part in the bellows assembly, and the lower end of the adjusting screw is connected with the upper end of the first spring after penetrating through the upper end of the reducing joint. The problem that the pressure drop of the contact type seal of the bearing cavity of the gas turbine cannot be guaranteed to be the best value is solved.

Description

Technical Field

[0001] This invention relates to a pressure drop regulator, specifically a pressure drop regulator applied to a gas turbine, belonging to the field of gas turbines. Background Technology

[0002] The gas turbine lubrication system ensures lubrication and cooling of bearing components and gear meshing parts under all engine operating conditions. It consists of an oil supply system, an oil return system, and a ventilation system. The ventilation system connects the gas turbine's lubrication chamber to the atmosphere to ensure the proper functioning of the lubrication system and seals. Lubricating oil for bearing lubrication and cooling flows into the gas turbine's bearing chamber, which is sealed from the flow passages and the atmosphere. To prevent lubricating oil from entering the flow passages from the bearing chamber, in addition to mechanical seals, a gas seal is also established by drawing compressed air from the low-pressure compressor.

[0003] To ensure that the pressure drop of the gas turbine bearing cavity contact seal is at its optimal value, reduce the leakage of lubricating oil from the bearing cavity to the flow path, and reduce the amount of lubricating oil consumed, the pressure inside the bearing cavity must be precisely controlled while drawing compressed air from the low-pressure compressor to maintain the pressure drop of the bearing cavity contact seal. To meet the above requirements, a pressure drop regulator is installed between the air bleed chamber and the bearing cavity to maintain a constant pressure difference before and after the bearing cavity is sealed. Summary of the Invention

[0004] This invention addresses the problem that the pressure drop of contact seals in gas turbine bearing cavities cannot guarantee the optimal value, and proposes a pressure drop regulator for use in gas turbines.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: The present invention includes a bellows assembly, a valve assembly, a housing assembly, an adjusting screw, a reducing fitting, a first spring, and a seated screw; the bellows assembly is installed inside the upper end of the housing assembly, the upper end of the seated screw passes through the bottom of the housing assembly and is inserted into the bellows assembly, the valve assembly is installed inside the bellows assembly, the reducing fitting is installed at the upper end of the bellows assembly, the first spring is located in the upper part of the bellows assembly, and the lower end of the adjusting screw passes through the upper end of the reducing fitting and is connected to the upper end of the first spring.

[0006] Furthermore, the bellows assembly includes a flange, a ring, a bushing, a pipe, a valve disc, a bellows, a ring, a bushing, and a cap; the cap is fitted onto the outer wall of the second bushing, the second ring is embedded in the second bushing, the upper edge of the bellows is inserted between the second ring and the inner wall of the second bushing, the valve disc and the pipe are arranged sequentially from top to bottom inside the bellows, with the lower end of the valve disc inserted into the upper end of the pipe and the lower end of the pipe inserted into the flange, the first bushing and the first ring are fitted onto the flange sequentially from the outside to the inside, and the lower edge of the bellows is inserted between the inner surface of the first bushing and the outer surface of the first ring.

[0007] Furthermore, the valve assembly includes a support, a washer, and a valve; the washer and the valve are arranged sequentially from the lower right to the upper right in a groove on the lower surface of the support, with a gap between the washer and the valve.

[0008] Furthermore, the housing assembly includes a housing, a support, and multiple double-ended studs; the support is embedded in the inner bottom surface of the housing, and multiple double-ended studs are inserted into the outer edge of the upper end of the housing.

[0009] Furthermore, the seated screw includes a screw and a seat; the screw is inserted into the support, the seat is embedded in the upper end of the screw, and the seat is in contact with the valve.

[0010] Furthermore, the present invention also includes a first sealing ring, which is fitted onto the outer wall of the lower part of the cover and is located between the outer wall of the cover and the inner wall of the housing.

[0011] Furthermore, the present invention also includes a cover and a second sealing ring, the cover being fitted onto the upper end of the adjusting screw, and the second sealing ring being fitted onto the adjusting screw.

[0012] Furthermore, the present invention also includes a second spring and a third ring, which are sequentially fitted onto the support from top to bottom, with the lower surface of the outer edge of the support at the upper end of the second spring in contact with it.

[0013] Furthermore, the present invention also includes a first plug, a first cone, and a first pipe connector; the lower end of the first pipe connector is inserted into a through hole on the upper surface of the plug, and the first plug and the first cone are installed sequentially from top to bottom at the upper end of the first pipe connector.

[0014] Furthermore, the present invention also includes a second pipe connector, a second plug, and a second cone; the second pipe connector is horizontally arranged, with its right end inserted into a through hole in the lower outer wall of the housing, and the second plug and the second cone are sequentially installed on the left end of the second pipe connector.

[0015] The beneficial effects of this invention are: this invention ensures that the pressure drop of the contact seal in the bearing cavity of the gas turbine is within the specified range, reduces lubricating oil consumption, and improves the reliability of the gas turbine; the pressure drop regulator provided by this invention can adjust the pressure drop of the contact seal in the bearing cavity within a certain range, which can ensure that oil and gas in the bearing cavity do not enter the flow path, reduce lubricating oil consumption, and improve the economy and reliability of gas turbine operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is the structural design of the bellows assembly;

[0018] Figure 3 This is a structural diagram of the valve assembly;

[0019] Figure 4 This is a schematic diagram of a screw with a mounting bracket;

[0020] Figure 5 This is a structural schematic diagram of the housing assembly. Detailed Implementation

[0021] Specific implementation method one: Combining Figures 1 to 5 This embodiment describes a pressure drop regulator for a gas turbine, comprising a bellows assembly 1, a valve assembly 2, a housing assembly 3, an adjusting screw 10, a reducing connector 12, a first spring 17, and a seated screw 18. The bellows assembly 1 is installed inside the upper end of the housing assembly 3. The upper end of the seated screw 18 passes through the bottom of the housing assembly 3 and is inserted into the bellows assembly 1. The valve assembly 2 is installed inside the bellows assembly 1. The reducing connector 12 is installed at the upper end of the bellows assembly 1. The first spring 17 is located in the upper part of the bellows assembly 1. The lower end of the adjusting screw 10 passes through the upper end of the reducing connector 12 and is connected to the upper end of the first spring 17.

[0022] In this embodiment, compressed air from the low-pressure compressor is introduced through the second pipe joint 16, and an oil-gas mixture is introduced into the bearing cavity through the seated screw 18. When the sum of the upward spring force of the second spring 19 on the bellows assembly 1, the upward pressure of the oil-gas mixture in the bearing cavity on the bellows assembly 1, and the upward elastic force of the bellows assembly 1, equals the sum of the downward spring force of the first spring 17 on the bellows assembly 1 and the downward pressure of the compressed air from the low-pressure compressor on the bellows assembly 1, the pressure drop regulator reaches a balanced state. At this time, the bearing cavity contact seal pressure drop is a certain value. The bearing cavity contact seal pressure drop can be coarsely adjusted by adjusting the position of the seated screw 18, and the contact seal pressure drop can be finely adjusted by adjusting the position of the adjusting screw 10.

[0023] Specific Implementation Method Two: Combining Figures 1 to 5 This embodiment describes a bellows assembly 1 for a pressure drop regulator used in a gas turbine, comprising a flange 1A, a ring 1B, a bushing 1C, a pipe 1D, a valve disc 1E, a bellows 1F, a ring 1G, a bushing 1H, and a cover 1I. The cover 1I is fitted onto the outer wall of the second bushing 1H, the second ring 1G is embedded in the second bushing 1H, the upper edge of the bellows 1F is inserted between the inner wall of the second ring 1G and the second bushing 1H, the valve disc 1E and the pipe 1D are arranged sequentially from top to bottom inside the bellows 1F, with the lower end of the valve disc 1E inserted into the upper end of the pipe 1D, and the lower end of the pipe 1D inserted into the flange 1A. The first bushing 1C and the first ring 1B are fitted onto the flange 1A sequentially from the outside to the inside, and the lower edge of the bellows 1F is inserted between the inner surface of the first bushing 1C and the outer surface of the first ring 1B.

[0024] In this embodiment, the bellows assembly 1 is welded together from a flange, a ring, a bushing, a pipe, a valve disc, a bellows, and a cover, forming a chamber for introducing compressed air from the low-pressure compressor.

[0025] The other components and connections are the same as in Specific Implementation Method 1.

[0026] Specific implementation method three: Combining Figures 1 to 5 This embodiment describes a valve assembly 2 for a pressure drop regulator applied to a gas turbine, which includes a support 2A, a washer 2B, and a valve 2C. The washer 2B and the valve 2C are arranged sequentially from the lower right to the upper right in a groove on the lower surface of the support 2A, with a gap between the washer 2B and the valve 2C.

[0027] In this embodiment, the lower surface of valve 2C contacts the upper end of the seated screw 18; after the support tightens the gasket, the valve can swing easily in all directions within the space enclosed by the support and the gasket.

[0028] The other components and connections are the same as in Specific Implementation Method 1.

[0029] Specific implementation method four: Combination Figures 1 to 5 This embodiment describes a housing assembly 3 for a pressure drop regulator used in a gas turbine, comprising a housing 3A, a support 3B, and multiple double-ended studs 3C. The support 3B is embedded in the inner bottom surface of the housing 3A, and multiple double-ended studs 3C are inserted into the outer edge of the upper end of the housing 3A.

[0030] In this embodiment, the outer edge of the upper end of the housing 3A is detachably connected to the outer edge of the cover 1I through multiple double-ended studs 3C; the housing and the support are interference fit, the end face of the support is used to support the spring, and the double-ended studs are used to connect the housing and the bellows assembly.

[0031] The other components and connections are the same as in Specific Implementation Method 1.

[0032] Specific Implementation Method Five: Combining Figures 1 to 5 This embodiment describes a seated screw 18 for a pressure drop regulator used in a gas turbine, which includes a screw 18A and a seat 18B. The screw 18A is inserted into a support 3B, and the seat 18B is embedded in the upper end of the screw 18A, and the seat 18B is in contact with the valve 2C.

[0033] The screw and the housing are interference fit, and the screw has a hollow structure to release the oil-gas mixture in the bearing cavity.

[0034] Other components and connections are the same as in specific implementation method one or three.

[0035] Specific Implementation Method Six: Combination Figures 1 to 5This embodiment describes a pressure drop regulator for a gas turbine, which further includes a first sealing ring 4. The first sealing ring 4 is fitted onto the outer wall of the lower part of the cover 1I, and is located between the outer wall of the cover 1I and the inner wall of the housing 3A. Other components and connections are the same as in specific embodiments two or four.

[0036] Specific implementation method seven: Combining Figures 1 to 5 This embodiment describes a pressure drop regulator for a gas turbine, which further includes a cover 9 and a second sealing ring 11. The cover 9 is fitted onto the upper end of the adjusting screw 10, and the second sealing ring 11 is fitted onto the adjusting screw 10. Other components and connections are the same as in specific embodiment one.

[0037] Specific implementation method eight: Combination Figures 1 to 5 This embodiment describes a pressure drop regulator for a gas turbine, which further includes a second spring 19 and a third ring 20. The second spring 19 and the third ring 20 are sequentially mounted on the support 3B from top to bottom, with the lower surface of the outer edge of the support 2A at the upper end of the second spring 19 in contact with it. Other components and connections are the same as in specific embodiments three or four.

[0038] Specific Implementation Method Nine: Combining Figures 1 to 5 This embodiment describes a pressure drop regulator for a gas turbine, which further includes a first plug 13, a first cone 14, and a first pipe connector 16. The lower end of the first pipe connector 16 is inserted into a through hole on the upper surface of the cover 11, and the first plug 13 and the first cone 14 are sequentially installed from top to bottom on the upper end of the first pipe connector 16. Other components and connections are the same as in specific embodiments one or two.

[0039] Specific Implementation Method Ten: Combining Figures 1 to 5 This embodiment describes a pressure drop regulator for a gas turbine, which further includes a second pipe connector 24, a second plug 25, and a second cone 26. The second pipe connector 24 is horizontally positioned, with its right end inserted into a through hole in the lower outer wall of the housing 3A. The second plug 25 and the second cone 26 are sequentially installed on the left end of the second pipe connector 24. Other components and connections are the same as in specific embodiment one.

[0040] Working principle

[0041] During gas turbine operation, compressed air from the low-pressure compressor is introduced through the first pipe joint 16 and an oil-gas mixture is introduced into the bearing cavity through the seated screw 18. When the bearing cavity pressure increases, the valve assembly 2 moves upward to expose the bypass hole passing through the seated screw 18 from the bearing cavity, resulting in a decrease in bearing cavity pressure. When the bearing cavity pressure decreases, the valve assembly 2 moves downward to block the bypass hole, causing the bearing cavity pressure to increase. The pressure in the bearing cavity is adjusted by changing the clearance between the valve assembly 2 and the seated screw 18 using the adjusting screw 10.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A pressure drop regulator for use in a gas turbine, characterized in that: The pressure drop regulator applied to a gas turbine includes a bellows assembly (1), a valve assembly (2), a housing assembly (3), an adjusting screw (10), a reducing fitting (12), a first pipe fitting (16), a first spring (17), a seated screw (18), a second spring (19), and a third ring (20). The bellows assembly (1) includes a flange (1A), a first ring (1B), a first bushing (1C), a pipe (1D), a valve disc (1E), a bellows (1F), a second ring (1G), a second bushing (1H), and a cap (1I); the second ring (1G) is fitted inside the second bushing (1H), the upper edge of the bellows (1F) is inserted between the inner wall of the second ring (1G) and the second bushing (1H), the valve disc (1E) and the pipe (1D) are arranged sequentially from top to bottom inside the bellows (1F), and the lower end of the valve disc (1E) is inserted into the upper end of the pipe (1D), and the lower end of the pipe (1D) is inserted into the flange (1A). The bushing (1C) and the first ring (1B) are sequentially fitted onto the flange (1A) from the outside to the inside. The lower edge of the bellows (1F) is inserted between the inner surface of the first bushing (1C) and the outer surface of the first ring (1B). The lower end of the first pipe fitting (16) is inserted into the through hole on the upper surface of the cover (1I). The cover (1I) is fitted onto the outer wall of the second bushing (1H). The bellows assembly (1) is installed inside the upper end of the housing assembly (3). The upper end of the seated screw (18) passes through the bottom of the housing assembly (3) and is inserted into the bellows assembly (1). The valve assembly (2) is installed inside the bellows assembly (1). The reducing fitting (12) is also installed. Installed on the upper end of the bellows assembly (1), the first spring (17) is set in the upper part of the bellows assembly (1), and the lower end of the adjusting screw (10) passes through the upper end of the reducing joint (12) and is connected to the upper end of the first spring (17); the valve assembly (2) includes a support (2A), a washer (2B) and a valve (2C); the washer (2B) and the valve (2C) are arranged in the groove on the lower surface of the support (2A) from bottom to top, and a gap is left between the washer (2B) and the valve (2C); the housing assembly (3) includes a housing (3A), a support (3B) and a plurality of double-ended studs (3C); the support (3B) is embedded in the housing. Inside the inner bottom surface of (3A), multiple double-ended studs (3C) are inserted into the outer edge of the upper end of the housing (3A); the seated screw (18) includes a screw (18A) and a seat (18B). The screw (18A) and the seat (18B) are interference fit. The screw (18A) is a hollow structure. The screw (18A) is inserted into the support (3B). The seat (18B) is embedded in the upper end of the screw (18A) and the seat (18B) is in contact with the valve (2C); the second spring (19) and the third ring (20) are sequentially mounted on the support (3B) from top to bottom. The upper end of the second spring (19) is in contact with the lower surface of the outer edge of the support (2A); When the gas turbine is running, the first pipe joint (16) introduces compressed air from the low-pressure compressor, and the oil-gas mixture in the bearing cavity is introduced by the seated screw (18). When the bearing cavity pressure increases, the valve assembly (2) moves up to expose the bypass hole from the bearing cavity through the seated screw (18). When the bearing cavity pressure decreases, the valve assembly (2) moves down to block the bypass hole. When the sum of the upward spring force of the second spring (19) on the bellows assembly (1), the upward pressure of the oil-gas mixture in the bearing cavity on the bellows assembly (1), and the upward elastic force of the bellows assembly (1) is equal to the sum of the downward spring force of the first spring (17) on the bellows assembly (1) and the downward pressure of the compressed air from the low-pressure compressor on the bellows assembly (1), the pressure drop regulator reaches a balanced state. The bearing cavity contact seal pressure drop is coarsely adjusted by adjusting the position of the seated screw (18), and the bearing cavity contact seal pressure drop is finely adjusted by adjusting the position of the adjusting screw (10).

2. The pressure drop regulator for a gas turbine according to claim 1, characterized in that: It also includes a first sealing ring (4), which is fitted on the outer wall of the lower part of the cover (1I) and is located between the outer wall of the cover (1I) and the inner wall of the housing (3A).

3. The pressure drop regulator for a gas turbine according to claim 1, characterized in that: It also includes a cover (9) and a second sealing ring (11), the cover (9) being fitted onto the upper end of the adjusting screw (10), and the second sealing ring (11) being fitted onto the adjusting screw (10).

4. The pressure drop regulator for a gas turbine according to claim 1, characterized in that: It also includes a first plug (13) and a first cone (14); the first plug (13) and the first cone (14) are installed from top to bottom on the upper end of the first pipe joint (16).

5. The pressure drop regulator for a gas turbine according to claim 1, characterized in that: It also includes a second pipe connector (24), a second plug (25), and a second cone (26); the second pipe connector (24) is horizontally arranged, and the right end of the second pipe connector (24) is inserted into the through hole in the lower outer wall of the housing (3A). The second plug (25) and the second cone (26) are installed sequentially on the left end of the second pipe connector (24).

Images