A high-efficiency high-speed vacuum gearbox body structure suitable for dual-mode operation of vacuum and atmosphere

Abstract

The application discloses a high-efficiency high-speed vacuum gear box body structure suitable for dual-mode operation of vacuum and atmosphere, and belongs to the technical field of high-speed gear boxes, comprising a lower box body, an upper box body, positioning pins and connecting bolts, the upper box body is arranged on the lower box body through the positioning pins, and the lower box body and the upper box body are connected through the connecting bolts, and the lower box body and the upper box body jointly enclose two bearing cavities and a vacuum cavity. The high-efficiency high-speed vacuum gear box body structure suitable for dual-mode operation of vacuum and atmosphere is adopted, floating ring seal lubrication is realized through the increase of a floating ring lubricating oil circuit, and the service life of the floating ring seal is prolonged; when the oil pump is in failure, the vacuum pump is stopped through a control system, the lubricating oil supply of the floating ring seal is reduced, a gas exchange valve is opened, the pressure in the vacuum cavity is instantaneously increased, the lubricating oil in the vacuum cavity opens a one-way check valve on a main oil return pipe by relying on its own gravity, the gear box is rapidly switched to the atmospheric mode, and normal operation of the unit is ensured.

Description

Technical Field

[0001] This invention relates to the field of high-speed gearbox technology, and in particular to a high-efficiency high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in both vacuum and atmospheric conditions. Background Technology

[0002] In the field of gas turbine power generation, high-speed gearboxes are the core equipment for realizing power transmission and speed conversion. As the "skeleton" of the entire gearbox, the gearbox structure undertakes the important tasks of supporting the transmission system, maintaining the lubrication environment, accommodating rotating parts, and ensuring transmission accuracy.

[0003] There are currently three main types of high-speed gearbox housing structures: 1. Traditional atmospheric gearbox housing: Composed of a lower housing and an upper housing, both equipped with bearing housings. The high-speed shaft and low-speed shaft are supported between the bearing housings by bearing bushes. The protruding parts of the shaft ends employ a mechanical seal structure to prevent lubricating oil leakage and the ingress of external contaminants. This structure can only operate in atmospheric mode and cannot meet the operating requirements of vacuum gearboxes, resulting in lower power generation efficiency.

[0004] 2. Full Vacuum Gearbox Housing: The overall structure is similar to that of a traditional housing, but the shaft end protrusion uses a floating ring seal, and the remaining exhaust ports are sealed with screw plugs, creating a vacuum chamber inside the entire housing. This structure has two major drawbacks: First, all lubricating oil is inside the vacuum chamber, requiring a high-power oil pump to extract it, significantly reducing the overall efficiency of the unit; second, the floating ring seal is located at the shaft extension end, making it unable to receive effective lubrication, and one side is exposed to air, resulting in a harsh working environment and extremely short service life.

[0005] 3. Semi-vacuum gearbox housing: Upper and lower sealing partitions are installed between the bearing housing and the gear. Floating ring seals are installed in the shaft holes of the partitions, ensuring the vacuum chamber contains only the gear portion. While this structure reduces the power requirement of the oil pump, the floating ring seal still lacks lubrication, resulting in a relatively short lifespan. More seriously, the lubricating oil in the gear chamber can only be discharged through the oil pump. If the oil pump fails, the unit must be shut down for maintenance. Furthermore, if the floating ring seal fails, it cannot switch to atmospheric operation, leading to extremely poor unit reliability.

[0006] In summary, existing high-speed gearbox housing structures generally suffer from problems such as the inability to achieve dual-mode operation in vacuum and atmospheric conditions, short lifespan of floating ring seals, and the necessity of shutdown in case of oil pump failure, which severely restrict the operating efficiency and reliability of gas turbine generator sets. Summary of the Invention

[0007] The purpose of this invention is to provide a high-efficiency, high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in both vacuum and atmospheric conditions. By adding a lubrication oil circuit to the floating ring seal, lubrication of the floating ring seal is achieved, thereby improving its service life. When the oil pump fails, the control system stops the vacuum pump, reducing the supply of lubricating oil to the floating ring seal. The ventilation valve opens, causing a sudden increase in pressure within the vacuum chamber. The lubricating oil in the vacuum chamber, relying on its own gravity, opens the one-way check valve on the main return oil pipe, and the gearbox quickly switches to atmospheric mode, ensuring normal unit operation.

[0008] To achieve the above objectives, the present invention provides a high-efficiency high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in vacuum and atmospheric conditions, comprising a lower housing, an upper housing, a positioning pin, and connecting bolts. The upper housing is mounted on the lower housing via the positioning pin, and the lower housing and the upper housing are connected by connecting bolts. The lower housing and the upper housing together enclose two bearing cavities and one vacuum cavity.

[0009] Preferably, the lower housing includes a bottom shell plate, a first bottom plate connected to the top left of the bottom shell plate, a first main board connected to the top surface of the first bottom plate, a first bearing seat connected inside the first main board, a second bottom plate connected to the top right of the bottom shell plate, a second main board connected to the top surface of the second bottom plate, a second bearing seat connected inside the second main board, a first side plate connected to the rear end of the first main board and the second main board, and a second side plate connected to the front end of the first main board and the second main board.

[0010] Preferably, the upper housing includes a top plate, a third main board connected to the left side of the top plate, a third bearing seat connected inside the third main board, the bottom surface of the third main board connected to the top surface of the first main board, the bottom surface of the third bearing seat connected to the top surface of the first bearing seat, a fourth main board connected to the right side of the top plate, a fourth bearing seat connected inside the fourth main board, the bottom surface of the fourth main board connected to the top surface of the second main board, the bottom surface of the fourth bearing seat connected to the top surface of the second bearing seat, the rear end of the bottom surface of the top plate connected to the top end of the first side plate, and the front end of the bottom surface of the top plate connected to the top end of the second side plate.

[0011] Preferably, a first floating ring sealing plate is connected to the inner wall of the first bearing housing, the bottom end of the first floating ring sealing plate is connected to the inner wall of the bottom shell plate, the front end of the first floating ring sealing plate is connected to the inner wall of the second side plate, a first shaft end sealing cavity is connected to the outer wall of the first bearing housing, a second floating ring sealing plate is connected to the inner wall of the second bearing housing, the bottom end of the second floating ring sealing plate is connected to the inner wall of the bottom shell plate, the front end of the second floating ring sealing plate is connected to the inner wall of the second side plate, and a second shaft end sealing cavity is connected to the outer wall of the second bearing housing.

[0012] Preferably, a third floating ring sealing plate is connected to the inner wall of the third bearing housing, the bottom end of the third floating ring sealing plate is connected to the top end of the first floating ring sealing plate, a third shaft end sealing cavity is connected to the outer wall of the third bearing housing, the bottom end of the third shaft end sealing cavity is connected to the top end of the first shaft end sealing cavity, a fourth floating ring sealing plate is connected to the inner wall of the fourth bearing housing, the bottom end of the fourth floating ring sealing plate is connected to the top end of the second floating ring sealing cavity, a fourth shaft end sealing cavity is connected to the outer wall of the fourth bearing housing, the bottom end of the fourth shaft end sealing cavity is connected to the top end of the second shaft end sealing cavity.

[0013] Preferably, the inner wall of the second side plate is connected to a bearing oil inlet pipe, one end of which is connected to the first floating ring sealing plate, and the other end of which is connected to the second floating ring sealing plate. The left side of the outer wall of the second side plate is connected to the first bearing oil return pipe, the right side of the outer wall of the second side plate is connected to the second bearing oil return pipe, the middle part of the outer wall of the second side plate is connected to the gear oil return pipe, and the outer wall of the gear oil return pipe is connected to the oil pump inlet pipe.

[0014] Preferably, the outer wall of the first side plate is provided with mounting holes for installing monitoring devices, and the outer wall of the second side plate is provided with connection holes for connecting ventilation valves.

[0015] Preferably, the side wall of the third main board is connected to a vacuum pump inlet pipe, and the top surface of the top plate is provided with a gear inspection hole.

[0016] Preferably, both the first floating ring sealing plate and the second floating ring sealing plate are provided with a floating ring seal lubrication channel to provide lubricating oil for the floating ring seal.

[0017] Therefore, the present invention adopts the above-mentioned high-efficiency high-speed vacuum gearbox housing structure suitable for dual-mode operation of gas turbines in vacuum and atmospheric conditions. By increasing the lubrication oil circuit of the floating ring seal, the floating ring seal is lubricated, thereby improving its service life. When the oil pump fails, the control system stops the vacuum pump, reduces the supply of lubricating oil to the floating ring seal, opens the ventilation valve, and the pressure in the vacuum chamber increases instantaneously. The lubricating oil in the vacuum chamber opens the one-way check valve on the main return oil pipe by its own gravity, and the gearbox quickly switches to atmospheric mode to ensure the normal operation of the unit.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the gas turbine high-efficiency high-speed vacuum gearbox housing structure suitable for dual-mode operation in vacuum and atmospheric conditions in this invention. Figure 2 This is a schematic diagram of the specific structure of the lower housing in this invention; Figure 3 This is a schematic diagram of the specific structure of the upper box in this invention.

[0020] Figure Labels 1. Lower housing; 101. Bottom shell plate; 102. First bottom plate; 103. First main plate; 104. First bearing housing; 105. Second bottom plate; 106. Second main plate; 107. Second bearing housing; 108. First side plate; 109. Second side plate; 110. First floating ring sealing plate; 111. First shaft end sealing cavity; 112. Second floating ring sealing plate; 113. Second shaft end sealing cavity; 114. Bearing oil inlet pipe; 115. First bearing oil return pipe 116. Second bearing oil return pipe; 117. Gear oil return pipe; 118. Oil pump inlet pipe; 2. Upper housing; 201. Top plate; 202. Third main plate; 203. Third bearing housing; 204. Fourth main plate; 205. Fourth bearing housing; 206. Third floating ring sealing plate; 207. Third shaft end sealing cavity; 208. Fourth floating ring sealing plate; 209. Fourth shaft end sealing cavity; 210. Vacuum pump inlet pipe; 3. Positioning pin; 4. Connecting bolts. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] like Figures 1-3As shown, a high-efficiency high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in vacuum and atmospheric conditions includes a lower housing 1, an upper housing 2, locating pins 3, and connecting bolts 4. The upper housing 2 is precisely positioned on the top mating surface of the lower housing 1 by the locating pins 3, ensuring the coaxiality and assembly accuracy of the upper and lower housings 1. The lower housing 1 and the upper housing 2 are fastened together by multiple sets of connecting bolts 4 evenly distributed circumferentially along the mating surface. The bolt preload is applied in stages according to the design torque value to ensure the overall rigidity of the housing and the sealing performance of the mating surface. The lower housing 1 and the upper housing 2 together enclose two independent, non-communicating bearing cavities and an independent vacuum cavity located between the two bearing cavities. The left bearing cavity accommodates the bearing assemblies on the left side of the high-speed shaft and the low-speed shaft, the right bearing cavity accommodates the bearing assemblies on the right side of the high-speed shaft and the low-speed shaft, and the middle vacuum cavity accommodates the transmission gear set composed of the high-speed gear and the low-speed gear.

[0024] The lower housing 1 is a welded structure, including a bottom shell plate 101. The bottom shell plate 101 has a rectangular groove structure, forming the bottom wall of the vacuum chamber. A first base plate 102 is vertically welded to the top left of the bottom shell plate 101. A first main plate 103 is vertically welded to the top surface of the first base plate 102. A first bearing seat 104 is welded inside the first main plate 103. The inner surface of the first bearing seat 104 is machined with a bearing bush mounting groove to support the lower left half of the bearing bush of the high-speed shaft and the low-speed shaft.

[0025] A second base plate 105 is vertically welded to the top right side of the bottom shell plate 101. The second base plate 105 is symmetrically arranged with the first base plate 102. A second main plate 106 is vertically welded to the top surface of the second base plate 105. The second main plate 106 is parallel to the first main plate 103. A second bearing seat 107 is welded inside the second main plate 106. The inner surface of the second bearing seat 107 is machined with a bearing bush mounting groove to support the lower right half of the bearing bush of the high-speed shaft and the low-speed shaft.

[0026] A first side plate 108 is vertically welded to the rear edge of the first main board 103 and the second main board 106, and the bottom edge of the first side plate 108 is welded to the rear edge of the bottom shell plate 101. A second side plate 109 is vertically welded to the front edge of the first main board 103 and the second main board 106, and the second side plate 109 is arranged parallel to the first side plate 108, with its bottom edge welded to the front edge of the bottom shell plate 101. The first bottom plate 102, the first main board 103, the second bottom plate 105, the second main board 106, the first side plate 108, the second side plate 109, and the bottom shell plate 101 are welded together to form the main frame of the lower housing 1, constituting the lower half of the two bearing cavities and the lower half of the vacuum cavity.

[0027] The upper housing 2 is a welded structure, including a top plate 201, which is an arc-shaped plate structure that forms the top wall of the vacuum chamber. A third main plate 202 is vertically welded to the left side of the top plate 201. The third main plate 202 is vertically aligned with the first main plate 103. A third bearing seat 203 is welded inside the third main plate 202. The inner surface of the third bearing seat 203 has a bearing mounting groove, which, together with the first bearing seat 104, forms the complete left-side bearing seat holes for the high-speed and low-speed shafts. The bottom surface of the third main plate 202 is fastened to the top surface of the first main plate 103 by connecting bolts 4. The bottom surface of the third bearing seat 203 is tightly fitted to the top surface of the first bearing seat 104, ensuring the roundness and coaxiality of the bearing seat holes.

[0028] A fourth main plate 204 is vertically welded to the right side of the top plate 201. The fourth main plate 204 is vertically aligned with the second main plate 106. A fourth bearing seat 205 is welded inside the fourth main plate 204. The inner surface of the fourth bearing seat 205 is machined with a bearing bush mounting groove, which, together with the second bearing seat 107, forms the complete right-side bearing seat holes for the high-speed and low-speed shafts. The bottom surface of the fourth main plate 204 is fastened to the top surface of the second main plate 106 by connecting bolts 4. The bottom surface of the fourth bearing seat 205 is tightly fitted to the top surface of the second bearing seat 107 to ensure the roundness and coaxiality of the bearing seat holes.

[0029] The rear edge of the bottom surface of the top plate 201 is fastened to the top of the first side plate 108 by connecting bolts 4, and the front edge of the bottom surface of the top plate 201 is fastened to the top of the second side plate 109 by connecting bolts 4. The top plate 201, the third main plate 202, the fourth main plate 204, and the first side plate 108 and the second side plate 109 of the lower housing 1 are assembled together to form two complete independent bearing cavities and one complete independent vacuum cavity, and the three cavities are completely sealed and isolated from each other.

[0030] A first floating ring sealing plate 110 is vertically welded to the inner wall of the first bearing housing 104 facing the vacuum chamber. The bottom end of the first floating ring sealing plate 110 is welded to the inner wall of the bottom shell plate 101, and the front end of the first floating ring sealing plate 110 is welded to the inner wall of the second side plate 109. A high-speed shaft through hole is opened at the front end of the center position of the first floating ring sealing plate 110, and a low-speed shaft through hole is opened at the rear end of the center position of the first floating ring sealing plate 110. A floating ring seal mounting groove is machined in the hole. A first shaft end sealing cavity 111 is welded to the outer wall of the first bearing housing 104, and a mechanical seal mounting groove is machined inside to accommodate the mechanical seal assembly of the high-speed shaft end.

[0031] A second floating ring sealing plate 112 is vertically welded to the inner wall of the second bearing housing 107 facing the vacuum chamber. The second floating ring sealing plate 112 is symmetrically arranged with the first floating ring sealing plate 110. The bottom end of the second floating ring sealing plate 112 is welded to the inner wall of the bottom shell plate 101, the front end of the second floating ring sealing plate 112 is welded to the inner wall of the second side plate 109, and the rear end of the second floating ring sealing plate 112 is welded to the inner wall of the first side plate 108. A high-speed shaft through hole is opened at the front end of the center position of the second floating ring sealing plate 112, and a low-speed shaft through hole is opened at the rear end of the center position of the second floating ring sealing plate 112. A floating ring seal mounting groove is machined in the hole. A second shaft end sealing cavity 113 is welded to the outer wall of the second bearing housing 107, and a mechanical seal mounting groove is machined inside to accommodate the mechanical seal assembly of the low-speed shaft end.

[0032] Both the first floating ring sealing plate 110 and the second floating ring sealing plate 112 are provided with floating ring sealing lubrication channels, which are used to provide lubricating oil for the floating ring seal.

[0033] A third floating ring sealing plate 206 is vertically welded to the inner wall of the third bearing housing 203 facing the vacuum chamber. The third floating ring sealing plate 206 is vertically aligned with the first floating ring sealing plate 110, and the bottom end of the third floating ring sealing plate 206 is tightly fitted with the top end of the first floating ring sealing plate 110, together forming the vacuum chamber partition wall on the left side. A third shaft end sealing cavity 207 is welded to the outer wall of the third bearing housing 203, and the third shaft end sealing cavity 207 and the first shaft end sealing cavity 111 are vertically joined to form a complete high-speed shaft end sealing cavity.

[0034] A fourth floating ring sealing plate 208 is vertically welded to the inner wall of the fourth bearing housing 205 facing the vacuum chamber. The fourth floating ring sealing plate 208 and the second floating ring sealing plate 112 are arranged vertically and vertically respectively. The bottom end of the fourth floating ring sealing plate 208 and the top end of the second floating ring sealing plate 112 are tightly fitted together to form the vacuum chamber partition wall on the right side. A fourth shaft end sealing cavity 209 is welded to the outer wall of the fourth bearing housing 205. The fourth shaft end sealing cavity 209 and the second shaft end sealing cavity 113 are joined vertically to form a complete low-speed shaft end sealing cavity.

[0035] The inner wall of the second side plate 109 is welded with two independent bearing oil inlet pipes 114. One end of one bearing oil inlet pipe 114 is welded to the bearing cavity on the left, and the other end of the other bearing oil inlet pipe 114 is welded to the bearing cavity on the right. The two bearing oil inlet pipes 114 provide independent lubricating oil supply for the bearings of the high-speed shaft and the low-speed shaft, respectively, and the oil pressure can be adjusted individually by the control system.

[0036] A first bearing oil return pipe 115 is welded to the left side of the outer wall of the second side plate 109. The first bearing oil return pipe 115 is connected to the cavity formed by the first floating ring sealing plate 110, the bottom shell plate 101, and the second side plate 109, and is used to discharge lubricating oil from the left bearings of the high-speed shaft and the low-speed shaft. A second bearing oil return pipe 116 is welded to the right side of the outer wall of the second side plate 109. The second bearing oil return pipe 116 is connected to the cavity formed by the second floating ring sealing plate 112, the bottom shell plate 101, and the second side plate 109, and is used to discharge lubricating oil from the right bearings of the high-speed shaft and the low-speed shaft. Both the first bearing oil return pipe 115 and the second bearing oil return pipe 116 are directly connected to an external oil tank to achieve independent circulation of bearing lubricating oil.

[0037] An oil inlet hole is provided in the upper half of the middle section of the outer wall of the second side plate 109, and a gear oil return pipe 117 is welded to the lower half of the middle section of the outer wall of the second side plate 109. The gear oil return pipe 117 is connected to the lowest point of the bottom of the vacuum chamber and is used to discharge the gear lubricating oil in the vacuum chamber. A one-way check valve is connected to the gear oil return pipe 117, which only allows lubricating oil to flow from the vacuum chamber to the oil tank in one direction, and completely blocks the flow in the reverse direction. An oil pump inlet pipe 118 is welded to the outer wall of the gear oil return pipe 117 and is connected to the inlet flange of the oil pump for extracting lubricating oil from the vacuum chamber in vacuum mode.

[0038] The outer wall of the first side plate 108 has multiple mounting holes, namely, a level gauge mounting hole, an internal pressure sensor mounting hole, and a temperature sensor mounting hole. The level gauge mounting hole is for mounting a level gauge to monitor the lubricating oil level in the vacuum chamber in real time. The internal pressure sensor mounting hole is for mounting a high-precision vacuum pressure sensor to monitor the pressure value in the vacuum chamber in real time. The temperature sensor mounting hole is for mounting a platinum resistance temperature sensor to monitor the lubricating oil temperature in the vacuum chamber in real time.

[0039] The outer wall of the second side plate 109 is provided with a ventilation valve connection hole, which is connected to the vacuum chamber and used for flange connection of an electrically controlled ventilation valve to realize the on / off control between the vacuum chamber and the atmosphere.

[0040] The outer wall of the third main board 202 is welded with a vacuum pump inlet pipe 210. The vacuum pump inlet pipe 210 is connected to the vacuum chamber, and the outer end flange is connected to the vacuum pump's suction port for pumping air from the vacuum chamber in vacuum mode.

[0041] The top surface of the top plate 201 is provided with a gear inspection hole, and a transparent observation window is connected to the gear inspection hole, so that the operator can observe the meshing operation status of the gears in the vacuum chamber without opening the box.

[0042] Working principle: When the gearbox is running in atmospheric mode, both the vacuum pump and the oil pump are stopped, the electrically controlled ventilation valve remains open, and the vacuum chamber is connected to the atmosphere through the ventilation valve.

[0043] The lubrication system consists of three independent circulation paths: The first lubricating oil enters the floating ring seal oil circuit through the floating ring seal inlet, lubricating and cooling the floating ring seal. At this time, the floating ring seal does not meet the sealing conditions and does not produce a sealing effect.

[0044] The second lubricating oil enters the vacuum chamber to lubricate and cool the high-speed and low-speed gears. The one-way check valve on the gear oil return pipe 117 opens automatically by gravity. After the lubricating oil in the vacuum chamber is collected, it is directly discharged back to the oil tank through the gear oil return pipe 117 to realize oil circulation.

[0045] The third lubricating oil enters the bearing cavities on both sides through the bearing inlet pipe 114 to lubricate and cool the bearing bushes of the high-speed shaft and the low-speed shaft. Then, it is directly discharged back to the oil tank through the first bearing return pipe 115 and the second bearing return pipe 116, respectively.

[0046] At this time, the level gauge and temperature sensor monitor the gearbox's operating status in real time. When an abnormal level or excessively high temperature occurs, the control system issues an alarm signal.

[0047] When the gearbox switches to vacuum mode, the control system automatically closes the electronically controlled air exchange valve and starts the vacuum pump to pump air into the vacuum chamber through the vacuum pump inlet pipe 210 on the third main board 202, reducing the pressure in the vacuum chamber to the set vacuum level and maintaining it stably.

[0048] The lubrication system still consists of three independent circulation paths: The first lubricating oil enters the floating ring seal oil circuit through the bearing inlet pipe 114, providing lubrication and cooling for the floating ring seal to ensure its sealing performance and service life.

[0049] The second lubricating oil enters the vacuum chamber to lubricate and cool the gear set. After the lubricating oil in the vacuum chamber is collected, it is drawn out by the oil pump through the oil inlet pipe 118 and discharged back to the oil tank, thus realizing oil circulation.

[0050] The third lubricating oil enters the bearing cavities on both sides to lubricate and cool the bearing bushes. It is then discharged directly back to the oil tank via the first bearing oil return pipe 115 and the second bearing oil return pipe 116, without entering the vacuum chamber.

[0051] To ensure the airtightness of the vacuum chamber, the main return oil pipe of the gear is automatically closed by a one-way check valve, and the vent is actively closed by a solenoid valve. At this time, the level gauge, internal pressure sensor, and temperature sensor installed on the gearbox monitor the operating status of the gearbox in real time.

[0052] When the oil pump fails, the control system immediately triggers the emergency switching procedure, and the entire process requires no manual intervention. Immediately stop the vacuum pump and disconnect the vacuum source.

[0053] The oil supply pressure and flow rate of the floating ring seal oil circuit are automatically reduced, causing the floating ring seal to exit the working state.

[0054] At the same time, the ventilation valve is opened, and outside air quickly fills the vacuum chamber, causing the pressure inside the vacuum chamber to quickly return to atmospheric pressure.

[0055] At this moment, the pressure difference across the one-way check valve on gear oil return pipe 117 disappears, and it automatically opens under the gravity of the lubricating oil. The lubricating oil in the vacuum chamber is then discharged directly back to the oil tank via gear oil return pipe 117 by its own gravity. The gearbox quickly switches to atmospheric mode to ensure the normal operation of the unit.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A high-efficiency, high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in both vacuum and atmospheric conditions, characterized in that: It includes a lower housing, an upper housing, a positioning pin, and a connecting bolt. The upper housing is mounted on the lower housing via the positioning pin, and the lower housing and the upper housing are connected by the connecting bolt. The lower housing and the upper housing together enclose two bearing cavities and a vacuum cavity.

2. The high-efficiency, high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in vacuum and atmospheric conditions as described in claim 1, characterized in that: The lower housing includes a bottom shell plate, a first bottom plate connected to the top left of the bottom shell plate, a first main board connected to the top surface of the first bottom plate, a first bearing seat connected inside the first main board, a second bottom plate connected to the top right of the bottom shell plate, a second main board connected to the top surface of the second bottom plate, a second bearing seat connected inside the second main board, a first side plate connected to the rear end of the first main board and the second main board, and a second side plate connected to the front end of the first main board and the second main board.

3. The high-efficiency, high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in vacuum and atmospheric conditions, as described in claim 2, is characterized in that: The upper housing includes a top plate. A third main board is connected to the left side of the top plate. A third bearing seat is connected inside the third main board. The bottom surface of the third main board is connected to the top surface of the first main board. The bottom surface of the third bearing seat is connected to the top surface of the first bearing seat. A fourth main board is connected to the right side of the top plate. A fourth bearing seat is connected inside the fourth main board. The bottom surface of the fourth main board is connected to the top surface of the second main board. The bottom surface of the fourth bearing seat is connected to the top surface of the second bearing seat. The rear end of the bottom surface of the top plate is connected to the top end of the first side plate. The front end of the bottom surface of the top plate is connected to the top end of the second side plate.

4. The high-efficiency, high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in vacuum and atmospheric conditions, as described in claim 3, is characterized in that: A first floating ring sealing plate is connected to the inner wall of the first bearing housing. The bottom end of the first floating ring sealing plate is connected to the inner wall of the bottom shell plate, and the front end of the first floating ring sealing plate is connected to the inner wall of the second side plate. A first shaft end sealing cavity is connected to the outer wall of the first bearing housing. A second floating ring sealing plate is connected to the inner wall of the second bearing housing. The bottom end of the second floating ring sealing plate is connected to the inner wall of the bottom shell plate, and the front end of the second floating ring sealing plate is connected to the inner wall of the second side plate. A second shaft end sealing cavity is connected to the outer wall of the second bearing housing.

5. The high-efficiency, high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in vacuum and atmospheric conditions, as described in claim 4, is characterized in that: The inner wall of the third bearing housing is connected to a third floating ring sealing plate, the bottom end of which is connected to the top end of the first floating ring sealing plate. The outer wall of the third bearing housing is connected to a third shaft end sealing cavity, the bottom end of which is connected to the top end of the first shaft end sealing cavity. The inner wall of the fourth bearing housing is connected to a fourth floating ring sealing plate, the bottom end of which is connected to the top end of the second floating ring sealing cavity. The outer wall of the fourth bearing housing is connected to a fourth shaft end sealing cavity, the bottom end of which is connected to the top end of the second shaft end sealing cavity.

6. The high-efficiency, high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in vacuum and atmospheric conditions, as described in claim 5, is characterized in that: The inner wall of the second side plate is connected to a bearing oil inlet pipe. One end of the bearing oil inlet pipe is connected to the first floating ring sealing plate, and the other end of the bearing oil inlet pipe is connected to the second floating ring sealing plate. The left side of the outer wall of the second side plate is connected to a first bearing oil return pipe, and the right side of the outer wall of the second side plate is connected to a second bearing oil return pipe. The middle part of the outer wall of the second side plate is connected to a gear oil return pipe, and the outer wall of the gear oil return pipe is connected to an oil pump inlet pipe.

7. The high-efficiency, high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in vacuum and atmospheric conditions as described in claim 6, characterized in that: The outer wall of the first side plate is provided with mounting holes for installing monitoring devices, and the outer wall of the second side plate is provided with connection holes for connecting air exchange valves.

8. The high-efficiency, high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in vacuum and atmospheric conditions, as described in claim 7, is characterized in that: The third main board is connected to a vacuum pump inlet pipe on its side wall, and a gear inspection hole is provided on the top surface of the top plate.

9. The high-efficiency, high-speed vacuum gearbox housing structure for gas turbines suitable for dual-mode operation in vacuum and atmospheric conditions as described in claim 8, characterized in that: Both the first and second floating ring sealing plates have internal lubrication channels for providing lubricating oil to the floating ring seal.

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