CN209976586U - Axial steam exhaust and exhaust cylinder with landing support bearing seat and steam turbine - Google Patents

Abstract

The utility model relates to a steam turbine technical field especially relates to an axial steam exhaust casing that bearing frame falls to ground and supports and reaches steam turbine including this steam exhaust casing. The exhaust steam cylinder comprises an exhaust steam cylinder outer cylinder supported on a foundation, wherein a bearing seat housing rigidly connected with the exhaust steam cylinder outer cylinder and a bearing seat positioned in the bearing seat housing and used for supporting a bearing are arranged in the exhaust steam cylinder outer cylinder, the bearing seat and the bearing seat housing are flexibly connected through a compensator, a supporting leg is arranged on the bearing seat, and the supporting leg extends out of the bearing seat housing and the exhaust steam cylinder outer cylinder and is fixed on the foundation. When the bearing seat is grounded and fixed, the compensator realizes larger axial and radial differential expansion compensation capacity, so that the limitation of exhaust steam temperature can be eliminated, the exhaust steam temperature under wet-cold and air-cooling conditions is completely adapted, and the universality is stronger. The bearing seats of the steam turbine unit adopting the axial steam exhaust and exhaust cylinder can be fixed on the ground, so that the stability of a shafting of the steam turbine unit can be greatly improved.

Description

Axial steam exhaust and exhaust cylinder with landing support bearing seat and steam turbine

Technical Field

The utility model relates to a steam turbine technical field especially relates to an axial steam exhaust casing that bearing frame falls to ground and supports and reaches steam turbine including this steam exhaust casing.

Background

The steam turbine is one of the key power plants in the construction of power stations, and is a rotary power machine which converts the heat energy of steam into mechanical energy, also called a steam turbine. High-temperature and high-pressure steam generated by a boiler passes through a steam turbine, heat energy and pressure potential energy are converted into mechanical energy of the steam turbine, a rotor of the steam turbine is driven to output shaft work, and the mechanical energy is transmitted to a generator through a rotating shaft of the steam turbine, so that the mechanical energy is converted into electric energy.

After the steam is heated by the boiler to reach design parameters, the steam is led to a steam inlet area of the steam turbine through a pipeline to enter the steam turbine, the steam flows through a through-flow area which is arranged in the steam turbine in a crossed mode through the static blades to do work, heat energy is converted into mechanical energy and finally converted into electric energy, the steam parameters after the work are reduced and do not meet parameter conditions of the work any more, therefore, the steam becomes exhaust steam, the exhaust steam is discharged to the condenser and finally condensed into water, and the water returns to the boiler to be heated again.

Steam turbines can be divided into downward steam exhaust, lateral steam exhaust and axial steam exhaust steam turbines according to different exhaust steam exhaust directions. The exhaust steam enters the condenser after being discharged from the exhaust cylinder, the exhaust steam is condensed into water after being subjected to sufficient heat exchange through the tube bundle in the condenser, and in order to ensure that the exhaust steam can be completely condensed into water to form vacuum, the heat exchange area of the condenser needs to be ensured, so that the condenser is huge in size. The elevation of the steam turbine set is directly determined by the vertical arrangement (downward steam exhaust) or the transverse arrangement (axial or lateral steam exhaust) of the huge condenser, and the elevation is higher, so that the construction cost of the power plant is higher. The elevation of the downward steam exhaust steam turbine set is higher; and the steam turbine set adopting the lateral steam exhaust and exhaust cylinder or the axial steam exhaust and exhaust cylinder greatly reduces the elevation of the set, thereby reducing the height of a factory building and reducing the construction cost of a power plant.

At present, an F-stage combined cycle steam turbine and a small-sized steam turbine are mainly provided with a steam turbine unit with an axial steam exhaust and exhaust cylinder, such as below 200MW power, and the manufacturing cost of the steam turbine is reduced while the construction cost of a factory building is reduced. At present, current axial steam exhaust turbine adopts the fixed mode of supporting the bearing frame on the cylinder, is called "seat jar formula", and utility model patent as bulletin number CN101321929B discloses a steam turbine of being furnished with bearing support body, and its bearing frame supports on the cylinder through three feet, has a foot in addition at the top. According to the operation performance of the commissioning unit, the conditions that shafting vibration is not ideal, bearing elevation is easy to change along with the change of parameters such as exhaust pressure and temperature, bearing support rigidity is relatively small and the like exist in the seat cylinder type bearing support, and the seat cylinder type axial exhaust steam turbine is easily influenced by the change of exhaust parameters due to the vibration, the elevation and the like are found.

Patent publication No. CN205189969U discloses an axial steam exhaust steam cylinder supported by a bearing seat on the ground, the bearing seat of the steam exhaust cylinder is supported on the foundation through the structure of two supporting legs, but the compensation mode can only realize transverse compensation and can not carry out axial compensation, therefore, the dead point setting of the unit must be arranged at the center line of the low-pressure exhaust cylinder bearing, the thrust bearing is arranged between the high-pressure cylinder and the medium-low pressure cylinder, and the medium-pressure bearing seat must be designed into a sliding bearing seat, the support rigidity of the sliding bearing seat is inferior to that of a landing fixed bearing seat, which is not beneficial to the stability of the shafting, meanwhile, the absolute expansion amount of the high-pressure rotor is the expansion of the outer cylinder of the medium-low pressure cylinder and the expansion of the high-pressure rotor, the difficulty (the range of a rotor expansion measuring instrument is limited) and the cost of rotor expansion measurement are increased, and the compensation amount and the uncertainty of the clutch are increased for the single-shaft unit.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide an axial steam exhaust steam cylinder that the bearing frame that possesses axial and radial differential expansion compensation ability falls to the ground and supports and reaches steam turbine including this steam exhaust steam cylinder to overcome prior art's above-mentioned defect.

In order to solve the technical problem, the utility model discloses a following technical scheme: the axial steam exhaust cylinder comprises a steam exhaust cylinder outer cylinder supported on a foundation, wherein a bearing seat housing rigidly connected with the steam exhaust cylinder outer cylinder and a bearing seat located in the bearing seat housing and used for supporting a bearing are arranged in the steam exhaust cylinder outer cylinder, the bearing seat and the bearing seat housing are flexibly connected through a compensator, supporting legs are arranged on the bearing seat, and extend out of the bearing seat housing and the steam exhaust cylinder outer cylinder and are fixed on the foundation.

Preferably, the bearing seat is rigidly connected with the rotor shaft seal, and two ends of the compensator are respectively connected with the rotor shaft seal and the bearing seat housing.

Preferably, a compensator protecting cover is further arranged in the exhaust cylinder outer cylinder, and the compensator protecting cover is sleeved outside the compensator and has a space with the compensator.

Preferably, the compensator shield is connected to the rotor shaft seal.

Preferably, the rotor shaft seal is located on an upstream side of the bearing housing, the compensator shield includes a tubular portion located on an outer circumferential side of the compensator and a bulkhead portion extending from one end of the tubular portion radially toward a center, the bulkhead portion is sealingly connected to the rotor shaft seal, and the compensator is located between the bulkhead portion and the bearing housing.

Preferably, the compensator is located on the outer circumferential side of the rotor shaft seal, and the shaft seal line of the rotor shaft seal is placed inside the compensator.

Preferably, the compensator is a bellows.

The utility model also provides a steam turbine, locate the steam exhaust casing of rotor including rotor and cover, the steam exhaust casing is as above the bearing frame fall to the ground the axial steam exhaust casing that supports.

Preferably, the steam turbine is provided with a front bearing and a rear bearing, the bearing seat in the exhaust cylinder is a rear bearing seat and is used for supporting the rear bearing, the steam inlet side of the exhaust cylinder is provided with a front bearing seat used for supporting the front bearing, and the front bearing seat is fixedly or slidably arranged in a floor manner.

Compared with the prior art, the utility model discloses the progress that has showing:

the utility model discloses an axial steam exhaust casing that bearing frame falls to ground and supports when the bearing frame falls to the ground fixedly, has realized great axial and radial differential expansion compensation ability through the compensator, consequently can put the restriction of exhaust steam temperature, adapts to the exhaust steam temperature under wet cold and the air cooling condition completely to have stronger commonality, be favorable to improving steam turbine unit's security and reliability, and shorten new steam turbine unit's development cycle. Because the bearing seat of the axial steam exhaust cylinder is grounded and fixed, and can simultaneously meet the axial and radial differential expansion compensation of the bearing seat and the outer cylinder of the steam exhaust cylinder under any working condition, the bearing seat of the steam turbine unit adopting the axial steam exhaust cylinder can be grounded and fixed, so that the stability of a steam turbine unit shafting can be greatly improved, and meanwhile, the adjustment of the elevation of the steam turbine unit shafting can be facilitated through the compensation capacity of the compensator.

The utility model discloses a steam turbine, the bearing frame of its steam exhaust casing falls to the ground fixedly, can satisfy the axial and the radial differential expansion compensation of bearing frame and steam exhaust casing under any operating mode simultaneously through the compensator, consequently this steam turbine unit bearing frame all can fall to the ground fixedly to make the stability of unit shafting obtain greatly improving, simultaneously, the adjustment of unit shafting elevation also can be convenient for through the compensation ability of compensator.

Drawings

Fig. 1 is a schematic view of the structural principle of the axial steam exhaust and exhaust cylinder of the landing support of the bearing pedestal of the embodiment of the present invention.

Fig. 2 is a cross-sectional schematic view of the axial steam exhaust and exhaust cylinder of the landing support of the bearing seat of the embodiment of the present invention.

Fig. 3 is an enlarged schematic view of a portion a in fig. 2.

Fig. 4 is a fixing device for mounting the bearing seat of the axial steam exhaust and exhaust cylinder of the embodiment of the utility model, which is supported by the bearing seat on the ground.

Fig. 5 is an enlarged schematic view of a portion B in fig. 4.

Fig. 6 is a fixing device for transporting an axial steam exhaust and exhaust cylinder supported on a landing of a bearing seat of the embodiment of the invention.

Wherein the reference numerals are as follows:

1. foundation 2, exhaust cylinder outer cylinder

3. Bearing seat housing 4 and bearing seat

41. Bearing block oil seal 5 and compensator

6. Support leg 7, bearing

8. Rotor shaft seal 81 and shaft seal pipeline

9. Rotor 10, compensator protective cover

101. Tubular part 102, partition part

11. Front bearing seat 201 and upper bracket

202. Lower bracket 203 and gasket

204. Fixing bolt 301 and flange cover

302. Transport ring 303, stay bolt

Detailed Description

The following describes the present invention in further detail with reference to the accompanying drawings. These embodiments are provided only for illustrating the present invention and are not intended to limit the present invention.

In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1 to 6, the present invention relates to an embodiment of an axial steam exhaust casing supported by a landing bearing seat.

Referring to fig. 1, 2 and 3, the axial exhaust steam exhaust cylinder supported by the bearing pedestal in a landing mode in the embodiment comprises an exhaust steam cylinder outer cylinder 2, and the exhaust steam cylinder outer cylinder 2 is supported on a foundation 1. The exhaust cylinder outer cylinder 2 is internally provided with a bearing seat housing 3, a bearing seat 4 and a compensator 5. The bearing seat housing 3 is rigidly connected with the exhaust cylinder outer cylinder 2, namely the bearing seat housing 3 and the exhaust cylinder outer cylinder 2 are relatively fixed. The bearing housing 4 is used to support a bearing 7 of the steam turbine, the bearing 7 being used to support a rotor 9 of the steam turbine. The bearing block 4 is located in the bearing block housing 3, and the bearing block housing 3 isolates the bearing block 4 from the exhaust cylinder outer cylinder 2. Be equipped with supporting leg 6 on the bearing frame 4, supporting leg 6 stretches out bearing frame housing 3 and exhaust casing outer cylinder 2, and supporting leg 6 stretches out the end fixing of exhaust casing outer cylinder 2 on basis 1 to realize that falling to the ground of bearing frame 4 is fixed, bearing frame 4 and supporting leg 6 are not fixed with bearing frame housing 3 and exhaust casing outer cylinder 2. The bearing block 4 is flexibly connected to the bearing block housing 3 by means of a compensator 5. The compensator 5 can compensate the radial thermal differential expansion and the axial thermal differential expansion between the exhaust cylinder outer cylinder 2 and the bearing seat 4, and the compensation capacity is large.

The above-mentioned axial steam extraction steam exhaust cylinder of this embodiment, when bearing frame 4 falls to the ground fixed, has realized great axial and radial differential expansion compensation ability through compensator 5, consequently can put away the restriction of exhaust steam temperature, adapts to the exhaust steam temperature under wet cold and the air cooling condition completely to have stronger commonality, be favorable to improving the security and the reliability of steam turbine unit, and shorten the development cycle of new steam turbine unit. Because the bearing seat 4 of the axial steam exhaust cylinder is grounded and fixed, and can simultaneously meet the axial and radial differential expansion compensation of the bearing seat 4 and the outer cylinder 2 of the steam exhaust cylinder under any working condition, the bearing seat of the steam turbine unit adopting the axial steam exhaust cylinder can be grounded and fixed, thereby greatly improving the stability of the steam turbine unit shafting, and simultaneously, the adjustment of the elevation of the steam turbine unit shafting can be facilitated through the compensation capability of the compensator 5.

Referring to fig. 1, 2 and 3, in the present embodiment, preferably, the bearing seat 4 is rigidly connected to the rotor shaft seal 8, the rotor shaft seal 8 is disposed on the rotor 9, and two ends of the compensator 5 are respectively connected to the rotor shaft seal 8 and the bearing seat housing 3. The exhaust cylinder outer cylinder 2 can drag the bearing seat housing 3 to move together when being heated and expanded, and the rotor shaft seal 8 is rigidly connected with the bearing seat 4, so that relative displacement can occur between the rotor shaft seal 8 and the bearing seat housing 3, the compensator 5 for connecting the rotor shaft seal 8 and the bearing seat housing 3 can compensate differential expansion between the rotor shaft seal 8 and the bearing seat housing 3, and the sealing performance of the steam turbine is ensured.

In this embodiment, the compensator 5 may be a bellows, which has a strong flexible deformation capability, and thus has a strong axial and radial compensation capability. The connecting flanges at the two ends of the corrugated pipe are designed to be larger at one end and smaller at the other end, the larger end of the flange can be connected with the bearing seat housing 3 through bolts, and the smaller end of the flange is fixedly connected with the rotor shaft seal 8.

Further, in the present embodiment, a compensator protecting cover 10 is further disposed inside the exhaust cylinder outer 2, and the compensator protecting cover 10 is externally sleeved on the compensator 5 and has a space with the compensator 5. The compensator protecting cover 10 is used for isolating the compensator 5 from the steam flow of the exhaust steam in the exhaust cylinder outer cylinder 2 and protecting the compensator 5, and the space between the compensator protecting cover 10 and the compensator 5 is not used for preventing the compensator protecting cover 10 from interfering the deformation of the compensator 5 during the axial and radial compensation.

Preferably, the compensator shield 10 may be fixedly connected with the rotor shaft seal 8. In the present embodiment, the rotor shaft seal 8 is located on the upstream side of the bearing housing 4 in the axial direction of the rotor 9, and "upstream" herein refers to an orientation located upstream in the exhaust steam flow direction a in the exhaust cylinder outer 2. The compensator shield 10 comprises a tubular portion 101 located at the outer circumferential side of the compensator 5 and a bulkhead portion 102 extending radially towards the centre from one end of the tubular portion 101, the bulkhead portion 102 being sealingly connected to the rotor shaft seal 8, the compensator 5 being located between the bulkhead portion 102 and the bearing housing 3. This makes it possible to separate the exhaust steam flow in the exhaust-gas cylinder outer 2 from the compensator 5.

In this embodiment, preferably, the compensator 5 is located on the outer peripheral side of the rotor shaft seal 8, and the shaft seal pipeline 81 of the rotor shaft seal 8 is placed inside the compensator 5, one end of the shaft seal pipeline 81 is connected with the rotor shaft seal 8, and the other end of the shaft seal pipeline 81 can axially extend out of the end of the compensator 5 and pass through the middle rear part of the bottom of the bearing seat 4 to pass through the exhaust cylinder outer cylinder 2. In this embodiment, the rotor shaft seal 8 can be a gland casing, and the shaft seal pipeline 81 is a gland pipe communicated with the gland casing.

In this embodiment, a bearing housing oil seal 41 may be provided on the outer side of the bearing housing 4 to seal the bearing housing 4. The bearing housing oil seal 41 may be fixed to the outside of the bearing housing 4 by bolts.

In this embodiment, preferably, bearing frame 4, bearing frame housing 3, rotor shaft seal 8 and compensator safety cover 10 are upper and lower semi-structures, are favorable to the assembly, and when overhauing bearing frame 4, only need demolish the first half of bearing frame housing 3, demolish the first half of bearing frame 4 again, can overhaul the inside of bearing frame 4, and easy operation is convenient.

In this embodiment, the bearing seat 4 may be mounted by using a fixing device for mounting the bearing seat, so as to prevent the bearing seat 4 from being displaced during the mounting process. Referring to fig. 4 and 5, the fixing device for mounting a bearing housing includes an upper bracket 201, a lower bracket 202, a spacer 203, and a fixing bolt 204. When the exhaust gas recirculation device is installed, the upper support 201 is welded with the supporting leg 6 of the bearing seat 4, the lower support 202 is welded with the lower half of the exhaust cylinder outer cylinder 2, the gasket 203 is arranged between the upper support 201 and the lower support 202, the upper support 201, the lower support 202 and the gasket 203 are fixedly connected through the fixing bolt 204, and the upper support 201, the lower support 202 and the gasket 203 are positioned through the positioning pins. Therefore, in the installation process, the bearing seat 4 and the lower half of the exhaust cylinder outer cylinder 2 are temporarily fixed by the fixing device for installing the bearing seat, so that the displacement of the bearing seat 4 can be prevented. And after the field installation is finished, the fixing bolt 204 and the positioning pin can be removed, and the gasket 203 is pulled out, so that the bearing seat 4 and the exhaust cylinder outer cylinder 2 can be unlocked, and the bearing seat 4 is not fixed with the exhaust cylinder outer cylinder 2.

The axial steam exhaust and exhaust cylinder of the embodiment can strengthen the transportation stability through the transportation fixing device in the transportation process. Referring to fig. 6, in the axial steam exhaust and exhaust cylinder of the present embodiment, a rotor shaft outlet is provided at an end of the bearing seat 4 for centering the rotor 9, and the fixing device for transportation includes a flange cover 301, a transportation ring 302 and a stay bolt 303. When whole transportation, can go out axle head department with the rotor that the flange cover 301 was fixed to bearing frame 4 through the screw, set up the blind hole that has the screw in flange cover 301 lateral surface center for be connected with the cooperation of pull rod bolt 303 screw thread, transport ring 302 and the outer jar 2 detachably fixed connection of exhaust casing, be connected flange cover 301 and transport ring 302 through pull rod bolt 303, thereby bearing frame 4 links together with the outer jar 2 of exhaust casing, can strengthen the stability of bearing frame 4 in the transportation. During field installation, the transportation ring 302, the pull rod bolt 303 and the flange cover 301 can be removed, and after the rotor is found out of the shaft, the flange is used for plugging the open holes on the shaft outlet ends of the bearing seat 4 and the bearing seat housing 3.

Because the compensator 5 has the transverse compensation capability, when the bearing raise degree needs to be adjusted in the process of finding a bearing on site, the elevation of the bearing seat 4 can be independently adjusted to realize the adjustment of the bearing raise degree, and the adjustment of the bearing raise degree and the adjustment of the exhaust cylinder outer cylinder 2 are not needed, so that the process of adjusting the bearing on site is simplified.

Based on the axial steam exhaust steam cylinder that above-mentioned bearing frame falls to ground to support, this embodiment still provides a steam turbine. The steam turbine of this embodiment includes rotor 9 and the steam exhaust casing of locating rotor 9, the steam exhaust casing is the axial steam exhaust casing that the above-mentioned bearing frame of this embodiment falls to ground to support. Because the bearing seat 4 of the axial steam exhaust cylinder is grounded and fixed, and the axial and radial differential expansion compensation of the bearing seat 4 and the outer cylinder 2 of the steam exhaust cylinder under any working condition can be met, the bearing seat of the steam turbine unit of the embodiment can be grounded and fixed, so that the stability of a steam turbine unit shafting can be greatly improved, and meanwhile, the adjustment of the elevation of the steam turbine unit shafting can be facilitated through the compensation capacity of the compensator 5.

Referring to fig. 1 and 2, the steam turbine of the present embodiment is provided with a front bearing and a rear bearing, the rear bearing is the bearing 7, the bearing seat 4 in the exhaust cylinder outer casing 2 is a rear bearing seat and is used for supporting the rear bearing, a front bearing seat 11 for supporting the front bearing is arranged on the steam inlet side of the exhaust cylinder, and the front bearing seat 11 can be fixed to the ground or arranged in a sliding manner. That is, the sliding pin system of the steam turbine according to the present embodiment may adopt any one of the following embodiments.

In the first embodiment, the front bearing seat 11 and the rear bearing seat are both fixed to the ground, the dead point of the rotor 9 is set on the front bearing seat 11, and the dead point of the cylinder is set on the front bearing seat 11. When the turbine expands thermally, both the rotor 9 and the cylinder expand in the + X direction. This is the best mode of implementation.

In the second embodiment, the front bearing seat 11 and the rear bearing seat are both fixed in a grounding mode, the dead point of the rotor 9 is arranged on the rear bearing seat, and the dead point of the cylinder is arranged at the end part of the exhaust cylinder. The rotor 9 and the cylinder both expand in the-X direction when the turbine expands thermally.

In the third embodiment, the front bearing seat 11 is arranged in a sliding mode, the rear bearing seat is fixed in a grounding mode, the dead point of the rotor 9 is arranged on the front bearing seat 11, and the dead point of the cylinder is arranged at the end part of the exhaust cylinder. When the steam turbine expands due to heat, the cylinder expands in the-X direction to push the front bearing seat 11 to slide in the-X direction, and the rotor 9 expands in the + X direction with the front bearing seat 11 as a relative dead point.

In the fourth embodiment, the front bearing seat 11 is arranged in a sliding manner, the rear bearing seat is fixed in a grounding manner, the rotor 9 dead point is arranged on the rear bearing seat, and the cylinder dead point is arranged at the end part of the exhaust cylinder. When the turbine expands due to heat, the rotor 9 and the cylinder both expand in the-X direction, and the cylinder pushes the front bearing seat 11 to slide in the-X direction.

The "+ X direction" and the "— X direction" are based on the coordinates shown in fig. 1, in which the X direction is parallel to the axial direction of the rotor 9 and the Z direction is perpendicular to the X direction in the vertical plane.

Of course, the steam turbine of this implementation also can be equipped with three bearing frame, be front axle bearing, middle bearing frame and rear bearing frame in proper order, and bearing frame 4 in exhaust casing outer casing 2 is as the rear bearing frame in this embodiment, and equally, three bearing frame all can fall to the ground fixed, then the absolute dead point and the relative dead point of unit can set up in middle bearing frame department, and the inflation of stator and rotor is towards both ends inflation in dead point department for the absolute value of inflation reduces greatly, and the inflation volume of high pressure rotor then is convenient for detect and control.

When the bearing seats fall to the ground and are fixed to the steam turbine unit for popularization and application, the bearing seats can be used for conventional small steam turbines and combined cycle steam turbines, so that the unit has better operation stability, the steam turbine axial steam exhaust arrangement method with lower popularization and construction cost can be popularized in water source-deficient areas, and huge economic benefits and environmental protection effects can be generated.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims (9)

1. The utility model provides an axial steam extraction steam exhaust cylinder that bearing frame falls to ground and supports, its characterized in that, including supporting steam extraction cylinder outer casing (2) on basis (1), be equipped with in steam extraction cylinder outer casing (2) with steam extraction cylinder outer casing (2) rigid connection's bearing frame housing (3) and being located bearing frame (4) that just are used for supporting bearing (7) in bearing frame housing (3), bearing frame (4) with bearing frame housing (3) are through compensator (5) flexible connection, be equipped with supporting leg (6) on bearing frame (4), supporting leg (6) stretch out bearing frame housing (3) with steam extraction cylinder outer casing (2) just fix on basis (1).

2. A bearing block floor supported axial exhaust steam exhaust cylinder according to claim 1, characterized in that the bearing block (4) is rigidly connected to a rotor shaft seal (8), and the compensator (5) is connected at both ends to the rotor shaft seal (8) and the bearing block housing (3), respectively.

3. A floor-supported axial exhaust casing according to claim 2, characterized in that a compensator protecting cover (10) is arranged in the casing (2), and the compensator protecting cover (10) is sleeved on the compensator (5) and has a space with the compensator (5).

4. A floor-supported axial exhaust casing according to claim 3, characterized in that the compensator shield (10) is connected to the rotor shaft seal (8).

5. A bearing housing floor supported axial exhaust steam exhaust cylinder according to claim 4, characterized in that the rotor shaft seal (8) is located at the upstream side of the bearing housing (4), the compensator shield (10) comprises a tubular portion (101) located at the outer circumference side of the compensator (5) and a bulkhead portion (102) extending from one end of the tubular portion (101) radially towards the center, the bulkhead portion (102) is sealingly connected with the rotor shaft seal (8), and the compensator (5) is located between the bulkhead portion (102) and the bearing housing (3).

6. A bearing block floor supported axial exhaust steam exhaust cylinder according to claim 2, characterized in that the compensator (5) is located at the outer circumference side of the rotor shaft seal (8), and the shaft seal line (81) of the rotor shaft seal (8) is placed inside the compensator (5).

7. A floor-supported axial steam exhaust casing according to claim 1, characterised in that the compensator (5) is a bellows.

8. A steam turbine comprising a rotor and a steam exhaust casing mounted on the rotor, wherein the steam exhaust casing is an axial steam exhaust casing supported on the bearing block floor according to any one of claims 1 to 7.

9. Steam turbine according to claim 8, characterized in that the steam turbine is provided with a front bearing and a rear bearing, that the bearing block (4) in the steam exhaust casing is a rear bearing block and is adapted to support the rear bearing, that the steam inlet side of the steam exhaust casing is provided with a front bearing block (11) adapted to support the front bearing, and that the front bearing block (11) is arranged to be fixed to the ground or to slide.

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