Steam seal structure for steam turbine

Abstract

The application relates to the technical field of honeycomb steam seal structures, in particular to a steam seal structure for a steam turbine, which comprises a bearing, a bearing end cover, a steam seal mechanism, a driving and embedding mechanism and a plurality of embedding contact blocks, a rotating groove is arranged at the shaft center of the bearing, the steam seal mechanism is rotationally arranged in the rotating groove, two sliding grooves are symmetrically arranged in the inside of the bearing and on the two sides of the rotating groove, the driving and embedding mechanism is slidingly arranged in the sliding grooves, the embedding contact blocks are fixedly arranged on the side of the driving and embedding mechanism close to the steam seal mechanism at intervals and can be tightly matched with the steam seal mechanism, and the bearing end cover is detachably arranged at one end of the bearing. The steam seal structure for the steam turbine can not only play a good steam sealing role, but also greatly facilitates the periodical maintenance of the steam seal structure compared with traditional devices, prolongs the service life of the steam seal structure and reduces the use cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of honeycomb seal structure, in particular to a steam seal structure for steam turbine. BACKGROUND

[0002] Honeycomb contact seal technology is a relatively mature technology, which has been widely used in space shuttles, high-power rockets, military and civil aircraft, and engines of various ships, as well as steam turbines, gas turbines and steam turbines in the power and petrochemical industries. Its service life is more than twice that of ordinary comb seal, and it has many superior performances such as reducing leakage, improving rotor stability and improving efficiency.

[0003] For the steam seal structure of the steam turbine, there is uninterrupted rotation between the rotating shaft and the bearing. Over time, due to long-term friction and loss of lubricating oil, maintenance is required to prevent the friction coefficient between the rotor and the stator from being too large, thereby damaging the steam turbine.

[0004] In the prior art, the steam seal is mainly achieved by a steam seal ring or a fixed inlay. The steam seal ring type seal can meet the environmental conditions of high temperature and high pressure gas, but the gap between the steam seal ring and the rotating shaft is large due to the high hardness of the honeycomb surface, so the sealing effect is poor. The fixed inlay structure has good sealing performance in the ideal state without wear, but it is inconvenient to maintain the fixed structure, so regular maintenance of the steam seal structure cannot be performed during use, which affects the service life of the honeycomb body steam seal structure.

[0005] In view of this, the present application provides a new steam seal structure for steam turbine. SUMMARY

[0006] The present application aims to provide a steam seal structure for steam turbine, which greatly facilitates the regular maintenance of the steam seal structure compared to traditional devices, prolongs the service life and reduces the use cost.

[0007] The present application provides a steam seal structure for steam turbine, comprising a bearing, a bearing end cover, a steam seal mechanism, a driving inlay mechanism and a plurality of inlay contact blocks. A rotating groove is formed at the shaft center of the bearing. The steam seal mechanism is rotatably arranged in the rotating groove. Two sliding grooves are symmetrically formed in the inside of the bearing and on both sides of the rotating groove. The driving inlay mechanism is slidably arranged in the sliding groove. The inlay contact blocks are fixedly arranged on one side of the driving inlay mechanism close to the steam seal mechanism and can tightly cooperate with the steam seal mechanism. The bearing end cover is detachably arranged at one end of the bearing.

[0008] As the technical scheme is preferably, the steam seal mechanism comprises a steam turbine rotating shaft and a plurality of rotating contact blocks, the rotating contact blocks are in a circular sleeve structure, the rotating contact blocks are arranged on the outer side of the steam turbine rotating shaft in a sleeved manner and are in sealed fixed connection with the steam turbine rotating shaft; the embedded contact blocks are in close fit with the outer wall of the steam turbine rotating shaft and the side wall of the rotating contact blocks.

[0009] As the technical scheme is preferably, the driving embedded mechanism comprises a sliding block, a strip-shaped through slot, a sliding rod and a push rod, the sliding block is slidingly arranged in the sliding groove, and the embedded contact block is fixedly arranged on the side of the sliding block close to the steam turbine rotating shaft; one end of the sliding block close to the side wall of the bearing is provided with a sliding groove perpendicular to the axial direction of the bearing, the strip-shaped through slot is arranged in the sliding block, and the sliding groove and the strip-shaped through slot are in communication with each other, the sliding rod is slidingly arranged in the strip-shaped through slot, and the push rod is slidingly arranged in the sliding groove, and one end of the push rod close to the strip-shaped through slot is fixedly connected with the sliding rod.

[0010] As the technical scheme is preferably, the driving embedded mechanism comprises a sliding block, a strip-shaped through slot, a sliding rod and a push rod, the sliding block is slidingly arranged in the sliding groove, and the embedded contact block is fixedly arranged on the side of the sliding block close to the steam turbine rotating shaft; one end of the sliding block close to the side wall of the bearing is provided with a sliding groove perpendicular to the axial direction of the bearing, the strip-shaped through slot is arranged in the sliding block, and the sliding groove and the strip-shaped through slot are in communication with each other, the sliding rod is slidingly arranged in the strip-shaped through slot, and the push rod is slidingly arranged in the sliding groove, and one end of the push rod close to the strip-shaped through slot is fixedly connected with the sliding rod.

[0011] As the technical scheme is preferably, the rotating contact blocks and the embedded contact blocks are in a mutually embedded relationship, and the width of each rotating contact block is equal to the spacing between adjacent embedded contact blocks, and the width of each embedded contact block is equal to the spacing between adjacent rotating contact blocks.

[0012] As the technical scheme is preferably, the number of rotating contact blocks is one more than the number of embedded contact blocks.

[0013] As the technical scheme is preferably, a first threaded groove is arranged in the end of the push rod close to the push plate, and the push plate and the push rod are fixed by tightening bolts.

[0014] As the technical scheme is preferably, a second threaded groove is arranged on the inner side of the end of the rotating groove close to the side wall of the bearing, and the bearing end cover is threadedly connected with the bearing.

[0015] As the technical scheme is preferably, the side of the bearing end cover close to the rotating contact blocks is in close fit with the rotating contact blocks.

[0016] The steam seal structure for steam turbines has at least the following technical effects:

[0017] The steam seal structure for steam turbine of the present application comprises a bearing, a bearing end cover, a steam seal mechanism, a driving fitting mechanism and a plurality of fitting contact blocks, wherein the driving fitting mechanism is slidingly arranged in a sliding groove inside the bearing, the fitting contact blocks are fixedly arranged at the bottom of the driving fitting mechanism, the bearing is movably connected with the steam seal mechanism through the driving fitting mechanism, when the steam seal mechanism needs to be maintained, the bearing end cover can be removed, and the fitting contact blocks are driven by the driving fitting mechanism to move away from the position of mutual fitting with the steam seal mechanism, so that the steam seal mechanism can be easily removed. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 It is a partial perspective view of the steam seal structure for steam turbine of the present application.

[0020] Figure 2 It is a front view of the steam seal structure for steam turbine of the present application.

[0021] Figure 3 It is an internal structure view of the steam seal structure for steam turbine of the present application.

[0022] Figure 4 It is a structure view of the bearing end cover in the steam seal structure for steam turbine of the present application.

[0023] Explanation of reference signs:

[0024] 1: bearing; 2: bearing end cover; 3: fitting contact block; 4: rotating groove; 5: sliding groove; 6: steam turbine rotating shaft; 7: rotating contact block; 8: sliding block; 9: strip-shaped through groove; 10: sliding rod; 11: push rod; 12: sliding groove; 13: push plate; 14: first threaded groove; 15: second threaded groove. DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of the present application.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "straight", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0027] In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more, unless otherwise explicitly specified. In addition, the terms "mounting", "connecting", "connecting" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] As shown in Figures 1-4 The present embodiment provides a steam seal structure for steam turbine, which comprises a bearing 1, a bearing end cover 2, a steam seal mechanism, a driving fitting mechanism and a plurality of fitting contact blocks 3, a rotating groove 4 is formed at the shaft center of the bearing 1, the steam seal mechanism is rotatably arranged in the rotating groove 4, two sliding grooves 5 are symmetrically formed at the inside of the bearing 1 and on both sides of the rotating groove 4, the driving fitting mechanism is slidably arranged in the sliding groove 5, the fitting contact blocks 3 are fixedly arranged on one side of the driving fitting mechanism close to the steam seal mechanism at intervals and can tightly cooperate with the steam seal mechanism, and the bearing end cover 2 is detachably arranged at one end of the bearing 1.

[0029] The steam seal structure of the application comprises a bearing 1, a bearing end cover 2, a steam seal mechanism, a driving fitting mechanism and a plurality of fitting contact blocks 3, wherein the driving fitting mechanism is slidingly arranged in a sliding groove 5 inside the bearing 1, the fitting contact blocks 3 are fixedly arranged at the bottom of the driving fitting mechanism, the steam seal mechanism is rotatably arranged in a rotating groove 4 at the shaft center of the bearing 1, the fitting contact blocks 3 are movably connected with the steam seal mechanism through the driving fitting mechanism, and the bearing 1 is movably connected with the steam seal mechanism. When the steam seal mechanism needs to be maintained, the bearing end cover 2 can be removed, and the fitting contact blocks 3 can be driven by the driving fitting mechanism to move away from the position of mutual fitting with the steam seal mechanism, so that the steam seal mechanism can be easily removed, and the steam seal mechanism can be maintained and repaired.

[0030] In addition, the steam seal mechanism itself is fitted with a plurality of fitting contact blocks 3 in a staggered fitting manner during rotation to seal the steam turbine, and the gas needs to pass through a plurality of small gaps when moving from one end of the steam seal structure to the other end, so that the gas is not easy to pass through, thereby achieving good steam sealing effect. Compared with the traditional device, the regular maintenance of the steam seal structure is greatly facilitated, the service life is prolonged, and the use cost is reduced.

[0031] In a specific embodiment of the application, the steam seal mechanism comprises a steam turbine shaft 6 and a plurality of rotating contact blocks 7, the rotating contact blocks 7 are in the form of a circular sleeve structure, the rotating contact blocks 7 are spaced apart and arranged on the outside of the steam turbine shaft 6, and are in sealed fixed connection with the steam turbine shaft 6; the fitting contact blocks 3 can be tightly fitted with the outer wall of the steam turbine shaft 6 and the side wall of the rotating contact blocks 7.

[0032] In this embodiment, the steam turbine shaft 6 is provided with a plurality of rotating contact blocks 7 protruding from the outer wall, and the outside of the rotating contact blocks 7 is fitted with the fitting contact blocks 3. When the steam turbine shaft 6 rotates, the rotating contact blocks 7 are in close contact with the fitting contact blocks 3, and the lubricating oil is coated thereon, so that the gas is difficult to pass through the lubricating oil from the long and small gap to the other end, thereby achieving good sealing effect. When the connection between the steam turbine shaft 6 and the bearing 1 needs to be maintained or the lubricating oil needs to be added, the fitting contact blocks 3 can be pulled away from the rotating contact blocks 7 by the driving fitting mechanism, so that the steam turbine shaft 6 can be easily removed. Therefore, the steam seal mechanism in this embodiment not only has good steam sealing effect, but also is easy to disassemble, and greatly facilitates the regular maintenance of the steam seal structure compared with the traditional device.

[0033] The driving fitting mechanism in the application is mainly used for driving the fitting contact blocks 3 to move up and down to fit or separate with the rotating contact blocks 7, and therefore, the specific structure thereof is not strictly limited, and the sliding block 8 driving mode or the threaded rotating mode can be selected to force the fitting contact blocks 3 to move.

[0034] In another specific embodiment of the present application, the driving fitting mechanism specifically comprises a sliding block 8, a strip-shaped through slot 9, a sliding rod 10 and a push rod 11, the sliding block 8 is slidingly arranged in the sliding groove 5, and the fitting contact block 3 is fixedly arranged on the side of the sliding block 8 close to the turbine rotating shaft 6; one end of the sliding block 8 close to the side wall of the bearing 1 is provided with a sliding groove 12 perpendicular to the axial direction of the bearing 1, the strip-shaped through slot 9 is arranged in the interior of the sliding block 8, and the sliding groove 12 and the strip-shaped through slot 9 are in communication with each other, the sliding rod 10 is slidingly arranged in the strip-shaped through slot 9, and the push rod 11 is slidingly arranged in the sliding groove 12, and one end of the push rod 11 close to the strip-shaped through slot 9 is fixedly connected with the sliding rod 10.

[0035] As shown in Figures 1-3 , the sliding grooves 5 are symmetrically arranged on both sides of the rotating groove 4, the sliding block 8 is slidingly arranged in the corresponding sliding groove 5, one end of the sliding block 8 close to the side wall of the bearing 1 is provided with a sliding groove 12, the push rod 11 is slidingly arranged in the sliding groove 12, the sliding block 8 is further provided with a strip-shaped through slot 9, and the upper end of the strip-shaped through slot 9 is inclined away from the sliding groove 12, the sliding rod 10 is slidingly arranged in the strip-shaped through slot 9, and one end of the push rod 11 close to the sliding rod 10 is fixedly connected with the sliding rod 10, so that the sliding rod 10 can be driven to slide in the strip-shaped through slot 9 by pulling or pushing the push rod 11. Since the strip-shaped through slot 9 is arranged as an inclined slot, according to force analysis, when the sliding rod 10 gives the strip-shaped through slot 9 a force in one direction, the sliding block 8 will be subjected to a force in a direction perpendicular to the force, so that the sliding block 8 can slide up and down in the sliding groove 5, thereby realizing the separation or fitting of the fitting contact block 3 and the rotating contact block 7.

[0036] As shown in Figure 2 , when the push rod 11 is pushed, the sliding rod 10 will be driven to slide in the strip-shaped through slot 9 away from the bearing end cover 2, at this time, the upper and lower two sliding blocks will slide towards the rotating contact block 7, thereby realizing the close fitting of the fitting contact block 3 and the rotating contact block 7.

[0037] As shown in Figure 3 , when the push rod 11 is pulled, the sliding rod 10 will be driven to slide in the strip-shaped through slot 9 towards the bearing end cover 2, at this time, the upper and lower two sliding blocks will slide away from each other, thereby pulling the fitting contact block 3 away from the rotating contact block 7.

[0038] On the basis of the above technical scheme, further preferably, in order to simultaneously realize the movement of the two push rods 11, a push plate 13 is further arranged outside the push rod 11, specifically, one end of the push rod 11 away from the sliding rod 10 penetrates through the bearing 1 and extends to the outside of the bearing 1 and is detachably connected with the push plate 13.

[0039] The present application does not make strict limitation to the specific connection mode of the push rod 11 and the push plate 13, and can use threaded connection, and can also use the mode of buckle clamping.

[0040] In one specific embodiment of the present application, the push rod 11 is internally provided with a first threaded groove 14 near one end of the push plate 13, and the push plate 13 and the push rod 11 are fixed by tightening bolts.

[0041] On the basis of the above technical solution, further preferably, the rotating contact block 7 and the embedded contact block 3 are in a mutually embedded relationship, and the width of each rotating contact block 7 is equal to the spacing between adjacent embedded contact blocks 3, and the width of each embedded contact block 3 is equal to the spacing between adjacent rotating contact blocks 7. To ensure that the rotating contact block 7 and the embedded contact block 3 are embedded, they can be in close contact, and by tightly fitting the rotating contact block 7 and the embedded contact block 3 and coating lubricating oil, it can be difficult for gas to pass through the lubricating oil from the narrow and small gap to the other end, thereby achieving good sealing effect.

[0042] To further improve the sealing effect, the number of rotating contact blocks 7 is one more than the number of embedded contact blocks 3, that is, the close contact of the steam turbine rotating shaft 6 and the inner side wall of the bearing 1 is realized by the rotating contact block 7. Specifically, the side of the bearing end cover 2 close to the rotating contact block 7 is tightly fitted with the rotating contact block 7, and similarly, the other side of the steam turbine rotating shaft 6 is also tightly fitted with the rotating contact block 7 and the inner side wall of the bearing 1.

[0043] On the basis of the above technical solution, more preferably, the rotating groove 4 is provided with a second threaded groove 15 on the inner side surface of one end of the side wall of the bearing 1, and the bearing end cover 2 is threadedly connected with the bearing 1.

[0044] The working principle of the steam seal structure for the steam turbine is as follows: when the steam turbine works, the rotating shaft 6 of the steam turbine rotates on the bearing 1, and different air pressures are generated at both ends of the steam seal structure, and the gas flows from the end with high air pressure to the end with low air pressure through the gap between the rotating shaft 6 of the steam turbine and the bearing 1, the rotating contact block 7 is arranged outside the rotating shaft 6 of the steam turbine, and the embedded contact block 3 is arranged outside the rotating contact block 7, the two are in close contact, and are coated with lubricating oil, so that the gas is difficult to pass through the lubricating oil from the narrow and small gap to the other end, and the sealing effect is achieved. When it is necessary to maintain the connection or add lubricating oil, the bearing end cover 2 can be rotated to separate the bearing end cover 2 from the bearing 1, and the sliding rod 10 is driven by the push rod 11 to slide in the strip-shaped through groove 9 towards the direction where the bearing end cover 2 is located, and the two sliding blocks 8 are pushed to slide in the direction away from each other, so as to pull the embedded contact block 3 away from the rotating contact block 7, and the rotating shaft 6 of the steam turbine can be easily removed. Therefore, the steam seal structure for the steam turbine can not only achieve good sealing effect, but also be easily disassembled, and compared with the traditional device, the steam turbine rotating maintenance and application are greatly facilitated.

[0045] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A steam seal structure for a steam turbine, characterized by comprising: Including bearing (1), bearing end cover (2), steam seal mechanism, drive fitting mechanism and multiple fitting contact blocks (3), The shaft center of the bearing (1) is provided with a rotating groove (4), the steam seal mechanism is rotatably arranged in the rotating groove (4), the inside of the bearing (1) and the two sides of the rotating groove (4) are symmetrically provided with two sliding grooves (5), the drive fitting mechanism is slidably arranged in the sliding groove (5), the fitting contact blocks (3) are fixedly arranged on the side of the drive fitting mechanism close to the steam seal mechanism, and can be closely matched with the steam seal mechanism, and the bearing end cover (2) is detachably arranged on one end of the bearing (1). The steam seal mechanism comprises a steam turbine rotating shaft (6) and a plurality of rotating contact blocks (7), The rotating contact block (7) is in the form of a circular sleeve structure, and the rotating contact block (7) is spacedly sleeved on the outside of the steam turbine rotating shaft (6) and is in sealed fixed connection with the steam turbine rotating shaft (6). The fitting contact block (3) can be closely matched with the outer wall of the steam turbine rotating shaft (6) and the side wall of the rotating contact block (7). The drive fitting mechanism comprises a sliding block (8), a strip-shaped through groove (9), a sliding rod (10) and a push rod (11), The sliding block (8) is slidably arranged in the sliding groove (5), and the fitting contact block (3) is fixedly arranged on the side of the sliding block (8) close to the steam turbine rotating shaft (6). The end of the sliding block (8) close to the side wall of the bearing (1) is provided with a sliding groove (12) perpendicular to the axial direction of the bearing (1), the strip-shaped through groove (9) is arranged in the inside of the sliding block (8), the sliding groove (12) and the strip-shaped through groove (9) are in communication with each other, the sliding rod (10) is slidably arranged in the strip-shaped through groove (9), the push rod (11) is slidably arranged in the sliding groove (12), and the end of the push rod (11) close to the strip-shaped through groove (9) is fixedly connected with the sliding rod (10). The inner side of the end of the rotating groove (4) close to the side wall of the bearing (1) is provided with a second threaded groove (15), and the bearing end cover (2) is threadedly connected with the bearing (1).

2. The steam seal structure for a steam turbine according to claim 1, characterized by Further comprising a push plate (13), one end of the push rod (11) away from the sliding rod (10) penetrates through the bearing (1) and extends to the outside of the bearing (1) and is detachably connected with the push plate (13).

3. The steam seal structure for a steam turbine according to claim 2, characterized by The rotating contact block (7) and the fitting contact block (3) are in a mutually fitting relationship, and the width of each rotating contact block (7) is equal to the spacing between adjacent fitting contact blocks (3), and the width of each fitting contact block (3) is equal to the spacing between adjacent rotating contact blocks (7).

4. The steam seal structure for a steam turbine according to claim 3, characterized by The number of the rotating contact block (7) is one more than the number of the fitting contact block (3).

5. The steam seal structure for a steam turbine according to claim 4, characterized by The end of the push rod (11) close to the push plate (13) is provided with a first threaded groove (14) in the inside, and the push plate (13) and the push rod (11) are fixed by tightening bolts.

6. The steam seal structure for a steam turbine according to claim 1, characterized by The bearing end cover (2) is tightly matched with the rotating contact block (7) on the side close to the rotating contact block (7).

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