CN216895448U - High-rotation-speed coupler protection cover and high-rotation-speed steam turbine unit - Google Patents

Abstract

The utility model relates to a high-rotation-speed coupling protection cover and a high-rotation-speed steam turbine unit, wherein the high-rotation-speed coupling protection cover can be arranged between a steam turbine bearing box and a speed reducer bearing box and comprises an upper protection cover and a lower protection cover, one ends of the upper protection cover and the lower protection cover, which are close to the speed reducer bearing box, are fixedly arranged on the end surface of the speed reducer bearing box, one ends of the upper protection cover and the lower protection cover, which are close to the steam turbine bearing box, are connected with the steam turbine bearing box, and the upper protection cover is connected with the lower protection cover; the choke plate group is arranged between the upper protective cover and the lower protective cover and separates the working space of the high-rotation-speed coupler, the turbine bearing box and the speed reducer bearing box. The arrangement can effectively isolate the working space and the external space of the high-rotation-speed coupler, ensures the safety of the operating patrol personnel, and also avoids the phenomenon that oil leakage of the unit is caused because oil smoke in the bearing box of the steam turbine and the bearing box of the speed reducer is pumped out by the negative pressure area of the pair wheel of the high-rotation-speed coupler.

Description

High-rotation-speed coupler protection cover and high-rotation-speed steam turbine unit

Technical Field

The utility model relates to the technical field of steam turbine power generation, in particular to a high-rotation-speed coupler protective cover and a high-rotation-speed steam turbine unit.

Background

Along with the continuous development of the economy of China in recent years, the scale of industrial heat supply users is continuously enlarged, the heat supply requirements of heat users are stable, the steam quality and the steam parameter requirements are also continuously improved, and the high-rotating-speed high-backpressure steam turbine generator unit not only provides stable and reliable steam for the heat users, but also can provide electric power for enterprises, and reduces the operation cost of the enterprises.

The high-rotating-speed high-backpressure steam turbine has the characteristics of high steam inlet temperature and pressure, high rotating speed, matching arrangement of the speed reducer and high steam exhaust temperature and pressure, and is connected with the speed reducer through the coupler. The length of shortening steam turbine rotor and speed reducer rotor can effectively reduce the production manufacturing cost of high back pressure generating set main equipment, but when the unit moves, the shaft coupling pair wheel that is nearer apart from steam turbine and speed reducer bearing box, the root of shaft coupling pair wheel can produce the negative pressure region at high-speed rotatory in-process, this negative pressure region can be with the oil smoke suction of steam turbine bearing box and speed reducer bearing box, the oil smoke of suction can be collected in the high rotational speed steam turbine shaft coupling, and then lead to the phenomenon of unit oil leak, influence unit safe operation.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In view of the above disadvantages and shortcomings of the prior art, the present invention provides a high-speed coupling protection cover, which solves the technical problem of oil leakage of a unit caused by the suction of oil smoke in a bearing box from the root negative pressure region of a pair wheel of a high-speed steam turbine coupling.

(II) technical scheme

In order to achieve the above object, the high rotational speed coupling protective cover of the present invention comprises: the end parts, close to the speed reducer bearing box, of the upper protection cover and the lower protection cover are fixedly arranged on the end face of the speed reducer bearing box, the end parts, close to the steam turbine bearing box, of the upper protection cover and the lower protection cover are connected with the steam turbine bearing box, and the upper protection cover is connected with the lower protection cover;

the choke plate group is arranged between the upper protective cover and the lower protective cover, the choke plate group can separate the high-speed coupler from the working space of the turbine bearing box, and the choke plate group can separate the high-speed coupler from the working space of the speed reducer bearing box.

Optionally, the choke plate group includes a first choke plate and a second choke plate, the first choke plate is disposed at an end of the high-speed coupling protection cover close to the turbine bearing box, and the second choke plate is disposed at an end of the high-speed coupling protection cover close to the reducer bearing box;

the part of the first choke plate, which is positioned on the upper protection cover, is a first choke plate upper half plate, and the part of the first choke plate, which is positioned on the lower protection cover, is a first choke plate lower half plate; the part of the second choke plate, which is positioned on the upper protection cover, is a second choke plate upper half plate, and the part of the second choke plate, which is positioned on the lower protection cover, is a second choke plate lower half plate;

the connecting shaft of the steam turbine can penetrate through the first choke plate to be connected with the high-rotating-speed coupler, and the connecting shaft of the speed reducer can penetrate through the second choke plate to be connected with the high-rotating-speed coupler.

Optionally, a first circular through hole is formed in the middle of the first choke plate, a second circular through hole is formed in the middle of the second choke plate, the diameter of the first circular through hole is larger than the outer diameter of a connecting shaft of the steam turbine rotor, and the diameter of the second circular through hole is larger than the outer diameter of the connecting shaft of the reducer rotor;

the high-speed coupling protection cover, the connecting shaft of the steam turbine rotor, the connecting shaft of the speed reducer rotor and the center lines of the first air baffle plate and the second air baffle plate are all overlapped.

Optionally, the first and second choke plate upper portions are welded with the upper protective cover as an integral structure;

the lower part of the first choke plate and the lower part of the second choke plate are welded with the lower protective cover into an integral structure.

Optionally, a first oil catch is arranged at one end, close to the high-rotation-speed coupling protection cover, of the steam turbine bearing box, and a second oil catch is arranged at one end, close to the high-rotation-speed coupling protection cover, of the reducer bearing box;

a first blocking space is formed between the first oil baffle and the first choke plate, a second blocking space is formed between the first choke plate and the second choke plate, and a third blocking space is formed between the second choke plate and the second oil baffle.

Optionally, the upper protective cover is provided with an upper vent hole corresponding to the third blocking space, the lower protective cover is provided with a lower vent hole corresponding to the third blocking space, and the third blocking space is communicated with the atmosphere through the upper vent hole and the lower vent hole.

Optionally, the upper protection cover comprises an upper protection cover shell and an air filter, the upper protection cover shell is provided with an interface, and the upper protection cover shell is connected with the air filter through the interface.

Optionally, the lower protective cover comprises a lower protective cover shell and a compressed air inlet, wherein the compressed air inlet is arranged at one end, close to the steam turbine, of the lower protective cover shell.

Optionally, the upper protection cover and the lower protection cover are respectively provided with a reinforcing rib at the joint where the bearing box of the speed reducer is connected.

(III) advantageous effects

The utility model has the beneficial effects that: the protective cover for the high-rotation-speed coupler can effectively isolate the working space and the external space of the high-rotation-speed coupler, ensures the safety of inspection personnel when a high-rotation-speed turbine operates, and can prevent oil smoke in the space in a turbine bearing box and the space in a speed reducer bearing box from being extracted by a pair wheel negative pressure region of the high-rotation-speed coupler, so that the oil leakage phenomenon of a unit is avoided. And the arrangement of the high-rotation-speed coupling protective cover enables the turbine rotor and the rotor of the speed reducer to form a shaft system in a mode that the high-rotation-speed coupling is connected through the paired wheels, so that the total length of the turbine rotor and the speed reducer rotor can be effectively shortened, and the production and manufacturing cost of the turbine unit is reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of a high speed coupling protective cover and a high speed steam turbine set of the present invention;

FIG. 2 is a schematic diagram of the overall structure of the high-speed coupling protective cover of the present invention;

FIG. 3 is a schematic diagram of a housing structure of the high-speed coupling protective cover of the present invention;

FIG. 4 is a schematic cross-sectional view of a high-speed coupling protective cover according to the present invention;

FIG. 5 is an enlarged fragmentary view of a first oil stop of the high speed coupling protective cover of the present invention;

fig. 6 is an enlarged partial view of a second oil stop of the high speed coupling boot of the present invention.

[ description of reference ]

1: a high-rotation-speed coupler protective cover; 10: an upper protective cover; 101: an upper vent; 102: an air filter; 103: an upper shield shell; 11: a lower protective cover; 111: a lower vent; 112: a compressed air inlet; 113: a lower boot shell; 12: a first choke plate; 121: a first choke plate upper half plate; 122: a first choke plate lower half plate; 123: a first circular through hole; 13: a second choke plate; 131: a second choke plate upper half plate; 132: a second choke plate lower half plate; 133: a second circular through hole; 14: a first barrier space; 15: a second barrier space; 16: a third barrier space;

2: a high rotational speed coupling;

3: a high rotational speed turbine; 30: the space in the bearing box of the steam turbine; 31: a first oil catch;

4: a speed reducer; 41: a second oil catch;

5: an electric generator.

Detailed Description

For a better understanding of the above-described technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the utility model are shown in the drawings, it should be understood that the utility model can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

As shown in fig. 1, the present invention provides a high rotational speed coupling protective cover, which can be disposed between a turbine bearing housing and a reducer bearing housing; above-mentioned high rotational speed coupling safety cover includes: the gas barrier device comprises an upper protection cover 10, a lower protection cover 11 and a gas barrier plate group, wherein one ends of the upper protection cover 10 and the lower protection cover 11, which are close to a speed reducer bearing box, are fixedly arranged on the end surface of the speed reducer bearing box, one ends of the upper protection cover 10 and the lower protection cover 11, which are close to a turbine bearing box, are connected with the turbine bearing box, and the upper protection cover 10 is connected with the lower protection cover 11; the choke plate group is arranged between the upper protective cover 10 and the lower protective cover 11, the choke plate group can separate the high-rotation-speed coupler from the working space of the turbine bearing box, and the choke plate group can separate the high-rotation-speed coupler from the working space of the reducer bearing box.

In the above embodiment, the high-rotation-speed coupling protection cover 1 is arranged between the turbine bearing box and the reducer bearing box, the negative pressure region at the root of the pair of wheels of the high-rotation-speed coupling 2 is separated from the space between the turbine bearing box and the reducer bearing box one by one through the arrangement of the high-rotation-speed coupling protection cover 1, the high-rotation-speed coupling protection cover 1 can effectively prevent the oil smoke suction out of the turbine bearing box and the reducer bearing box from being originally in the negative pressure region at the root of the pair of wheels when the high-rotation-speed coupling 2 works through the separation of the working space, and the oil leakage of the turbine bearing box and the reducer bearing box is avoided. Moreover, the high-speed coupling protective cover 1 effectively avoids oil leakage of the bearing box, the lengths of the turbine rotor and the speed reducer rotor can be shortened when the high-speed turbine 3 is designed, manufactured and manufactured, the manufacturing cost is reduced, and the safety and the stability of the operation of the turbine are improved. And this high rotational speed shaft coupling safety cover 1 divide into safety cover 10 and lower safety cover 11, go up the mid-split flange department of safety cover 10 and lower safety cover 11 and use the bolt fastening, make up into the high rotational speed shaft coupling safety cover 1 of a hollow cylinder, high rotational speed shaft coupling safety cover 1 cooperatees with the cylindrical outer loop of steam turbine bearing box and is connected, high rotational speed shaft coupling safety cover 1 can freely expand to the direction of steam turbine bearing box, and keep apart high rotational speed shaft coupling 2 with external environment, and divide into safety cover 10 and lower safety cover 11 with this high rotational speed shaft coupling safety cover 1, this kind of detachably connects mounting structure, the turbine unit of being convenient for is maintained in the installation of use, the construction degree of difficulty has been reduced, there is extremely strong practicality.

As shown in fig. 2, a first choke plate 12 is arranged at one end of the high-rotation-speed coupling protection cover 1 close to a turbine bearing box, and a second choke plate 13 is arranged at one end of the high-rotation-speed coupling protection cover 1 close to a reducer bearing box; the part of the first choke plate 12 located in the upper protective cover 10 is a first choke plate upper half 121, the part of the first choke plate 12 located in the lower protective cover 11 is a first choke plate lower half 122, the part of the second choke plate 13 located in the upper protective cover 10 is a second choke plate upper half 131, and the part of the second choke plate 13 located in the lower protective cover 11 is a second choke plate lower half 132; the first choke plate upper half plate 121 and the first choke plate lower half plate 122 are located on the same vertical plane, the second choke plate upper half plate 131 and the second choke plate lower half plate 132 are located on the same vertical plane, the first choke plate upper half plate 121 and the first choke plate lower half plate 122 are connected to form the first choke plate 12, the second choke plate upper half plate 131 and the second choke plate lower half plate 132 are connected to form the second choke plate 13, a connecting shaft of a steam turbine can pass through the first choke plate 12 to be connected with the high-rotation-speed coupling 2, and a connecting shaft of the speed reducer 4 can pass through the second choke plate 13 to be connected with the high-rotation-speed coupling 2.

In this embodiment, the first choke plate 12 and the second choke plate 13 are provided to separate the working spaces of the turbine bearing housing, the high-speed coupling 2, and the speed reducer bearing housing, the first choke plate 12 separates the space between the turbine bearing housing and the pair of wheels of the high-speed coupling 2 on the turbine side, and the second choke plate 13 separates the space between the speed reducer bearing housing and the pair of wheels of the high-speed coupling 2 on the speed reducer 4 side, thereby preventing the oil leakage phenomenon in which the negative pressure region at the root of the pair of wheels of the high-speed coupling 2 sucks the oil smoke in the turbine bearing housing and the speed reducer bearing housing.

In a preferred embodiment, the middle part of the first choke plate 12 is provided with a first circular through hole 123, the middle part of the second choke plate 13 is provided with a second circular through hole 133, the diameter of the first circular through hole 123 is 1mm-4mm larger than the outer diameter of the connecting shaft of the turbine rotor, and the diameter of the second circular through hole 133 is 1mm-4mm larger than the outer diameter of the connecting shaft of the rotor of the speed reducer 4; the high-speed coupling protective cover 1, the connecting shaft of the turbine rotor and the connecting shaft of the speed reducer 4 rotor are overlapped with the center lines of the first choke plate 12 and the second choke plate 13. The upper part of the first choke plate 12 and the upper part of the second choke plate 13 are welded with the upper protective cover 10 into an integral structure; the lower portions of the first and second choke plates 12 and 13 are welded to the lower protection cover 11 as an integral structure.

In this embodiment, a first circular through hole 123 for inserting the connection shaft of the turbine rotor is opened in the middle of the first choke plate 12, and a second circular through hole 133 for inserting the connection shaft of the rotor of the speed reducer 4 is opened in the middle of the second choke plate 13. The upper part of the first choke plate 12 and the upper part of the second choke plate 13 are welded with the upper protection cover 10, the lower part of the first choke plate 12 and the lower part of the second choke plate 13 are welded with the lower protection cover 11, and the first choke plate and the lower part of the second choke plate are connected and fixed with the high-rotation-speed coupling protection cover 1 in a welded connection mode to form an integrated structure, so that the structure is safe and stable, and the service life of the high-rotation-speed coupling protection cover 1 can be effectively prolonged.

Referring to fig. 3, 5 and 6, a first oil catch 31 is arranged at one end of the turbine bearing box close to the high-rotation-speed coupling protection cover 1, and a second oil catch 41 is arranged at one end of the reducer bearing box close to the high-rotation-speed coupling protection cover 1; a first blocked space 14 is formed between the first oil dam 31 and the first choke plate 12, a second blocked space 15 is formed between the first choke plate 12 and the second choke plate 13, and a third blocked space 16 is formed between the second choke plate 13 and the second oil dam 41.

In this embodiment, the turbine rotor passes through the first oil level 31, the reducer 4 rotor passes through the second oil level 41, and the turbine rotor and the pair of wheels of the high-speed coupling 2 are connected to form one rotating shaft. The negative pressure area of the root of the wheel of the high-speed coupling 2 is positioned in the second blocking space 15 formed by the first air baffle plate 12 and the second air baffle plate 13, the first blocking space 14 formed by the first oil baffle 31 and the first air baffle plate 12 separates the negative pressure area of the bearing box of the steam turbine from the root of the wheel of the high-speed coupling 2, and the third blocking space 16 formed by the second oil baffle 41 and the second air baffle plate 13 separates the negative pressure area of the bearing box of the speed reducer from the negative pressure area of the root of the wheel of the high-speed coupling 2, so that the phenomenon of oil leakage caused by the fact that the negative pressure area of the root of the wheel of the high-speed coupling 2 sucks oil smoke out of the bearing box is prevented.

As shown in fig. 4, reinforcing ribs are provided at the joints where the upper protection cover 10 and the lower protection cover 11 are connected to the reducer bearing housing, respectively. The upper protective cover 10 is provided with an upper vent hole 101 corresponding to the third blocking space 16, the lower protective cover 11 is provided with a lower vent hole 111 corresponding to the third blocking space 16, and the third blocking space 16 is communicated with the atmosphere through the upper vent hole 101 and the lower vent hole 111.

In the embodiment, the upper vent holes 101 are positioned between the reinforcing ribs at the joint of the upper protective cover 10 and the reducer bearing box, the lower vent holes 111 are positioned between the reinforcing ribs at the joint of the lower protective cover 11 and the reducer bearing box, and the widths of the upper vent holes 101 and the lower vent holes 111 are both 15-30 mm. Specifically, the opening lengths of the upper vent hole 101 and the lower vent hole 111 are two sizes, namely a and b, wherein a is 50-80 mm, and b is 100-250 mm. The opening widths of the upper vent hole 101 and the lower vent hole 111 are specifically c, and in the present embodiment, c is preferably 15 to 40 mm.

The arrangement of the upper vent hole 101 and the lower vent hole 111 further reduces the influence of the negative pressure area at the root of the pair wheel of the high-rotation-speed coupling 2 on the bearing box of the speed reducer, and prevents the negative pressure area at the root of the pair wheel of the high-rotation-speed coupling 2 from sucking out oil smoke in the bearing box of the speed reducer.

In a preferred embodiment, the upper protective cover 10 includes an upper protective cover housing 103 and an air filter 102, the upper protective cover housing 103 has an interface, and the upper protective cover housing 103 is connected to the air filter 102 via the interface. The lower shroud 11 includes a lower shroud housing 113 and a compressed air inlet 112, and the compressed air inlet 112 is provided at one end of the lower shroud housing 113 near the steam turbine.

In this embodiment, the air filters 102 are connected to the interface of the upper protective cover housing 103 by a threaded connection, the number of the air filters 102 is usually 1-2, in this embodiment, the number of the air filters 102 is 2, and the air filters 102 are arranged to filter the air sucked into the high-speed coupling protective cover 1 and discharge the air into the working environment, so that the influence of dirt such as dust in the air on the operation of the high-speed coupling 2 can be effectively avoided.

According to the high-rotation-speed coupling protection cover 1 and the steam turbine thereof, the high-rotation-speed coupling protection cover 1 effectively isolates the high-rotation-speed coupling 2 from the external space, so that the safety and the effective noise isolation of inspectors when the high-rotation-speed steam turbine 3 operates can be ensured, the phenomenon of oil leakage of a steam turbine unit caused by the fact that oil smoke in the space 30 in a steam turbine bearing box and the space in a speed reducer bearing box is extracted by a negative pressure region at the coupling part of the high-speed coupling can be prevented, the rotor length of the high-rotation-speed steam turbine 3 and the rotor length of the speed reducer 4 can be effectively shortened due to the arrangement of the high-rotation-speed coupling protection cover 1, the manufacturing cost is reduced, the high-rotation-speed coupling protection cover 1 is simple to install, low in construction difficulty and high in practicability, and is suitable for large-scale production and use.

In the description of the present invention, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to imply that the number of technical features indicated are in fact significant. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.

In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.

Claims (10)

1. A high-rotation-speed coupling protection cover is characterized in that the high-rotation-speed coupling protection cover can be arranged between a steam turbine bearing box and a speed reducer bearing box;

high rotational speed coupling safety cover (1) includes: the gas barrier device comprises an upper protection cover (10), a lower protection cover (11) and a gas barrier plate group, wherein one ends, close to a speed reducer bearing box, of the upper protection cover (10) and one ends, close to the speed reducer bearing box, of the lower protection cover (11) are fixedly arranged on the end face of the speed reducer bearing box, one ends, close to a turbine bearing box, of the upper protection cover (10) and one ends, close to the turbine bearing box, of the lower protection cover (11) are connected with the turbine bearing box, and the upper protection cover (10) is connected with the lower protection cover (11);

the choke plate group is arranged between the upper protection cover (10) and the lower protection cover (11), the choke plate group can separate the high-speed coupler from the working space of the turbine bearing box, and the choke plate group can separate the high-speed coupler from the working space of the speed reducer bearing box.

2. A high speed coupling protection cover according to claim 1, characterized in that the choke pack comprises a first choke plate (12) and a second choke plate (13), the first choke plate (12) being arranged at the end of the high speed coupling protection cover (1) close to the turbine bearing housing, and the second choke plate (13) being arranged at the end of the high speed coupling protection cover (1) close to the turbine bearing housing;

the part of the first choke plate (12) positioned on the upper protective cover (10) is a first choke plate upper half plate (121), and the part of the first choke plate (12) positioned on the lower protective cover (11) is a first choke plate lower half plate (122); the part of the second choke plate (13) positioned on the upper protective cover (10) is a second choke plate upper half plate (131), and the part of the second choke plate (13) positioned on the lower protective cover (11) is a second choke plate lower half plate (132);

the connecting shaft of the steam turbine can penetrate through the first choke plate (12) to be connected with the high-rotating-speed coupler, and the connecting shaft of the speed reducer can penetrate through the second choke plate (13) to be connected with the high-rotating-speed coupler.

3. The high-speed coupling protective cover is characterized in that a first circular through hole (123) is formed in the middle of the first choke plate (12), a second circular through hole (133) is formed in the middle of the second choke plate (13), the diameter of the first circular through hole (123) is larger than the outer diameter of a connecting shaft of a turbine rotor, and the diameter of the second circular through hole (133) is larger than the outer diameter of the connecting shaft of a reducer rotor;

high rotational speed coupling safety cover (1) the connecting axle of steam turbine rotor the connecting axle of speed reducer rotor first choke plate (12) and the central line of second choke plate (13) all coincide.

4. The high-speed coupling boot of claim 3, wherein the first and second choke plate upper halves (121, 131) are welded to the upper boot (10) as a one-piece structure;

the first choke plate lower half plate (122) and the second choke plate lower half plate (132) are welded to the lower protective cover (11) to form an integral structure.

5. The high-speed coupling protection cover (1) according to claim 3, wherein a first oil stop (31) is arranged at one end of the turbine bearing housing close to the high-speed coupling protection cover (1), and a second oil stop (41) is arranged at one end of the reducer bearing housing close to the high-speed coupling protection cover (1);

a first blocking space (14) is formed between the first oil baffle (31) and the first choke plate (12), a second blocking space (15) is formed between the first choke plate (12) and the second choke plate (13), and a third blocking space (16) is formed between the second choke plate (13) and the second oil baffle (41).

6. The high-speed coupling protection cover (1) according to claim 5, wherein the upper protection cover (10) is provided with an upper vent hole (101) corresponding to the third isolated space (16), the lower protection cover (11) is provided with a lower vent hole (111) corresponding to the third isolated space (16), and the third isolated space (16) is communicated with the atmosphere through the upper vent hole (101) and the lower vent hole (111).

7. A high rotational speed coupling protection cover (1) according to any one of claims 1 to 6, characterized in that the upper protection cover (10) comprises an upper protection cover housing (103) and an air filter (102), the upper protection cover housing (103) is provided with an interface, and the upper protection cover housing (103) is connected with the air filter (102) through the interface.

8. A high-speed coupling protection cover (1) according to any one of claims 1 to 6, characterized in that the lower protection cover (11) comprises a lower protection cover housing (113) and a compressed air inlet (112), the compressed air inlet (112) being arranged at the end of the lower protection cover housing (113) close to the turbine.

9. The high-speed coupling protection cover (1) according to any one of claims 1 to 6, wherein reinforcing ribs are arranged at the connection positions of the upper protection cover (10) and the lower protection cover (11) and the reducer bearing box respectively.

10. A high rotational speed steam turbine set, which comprises a high rotational speed steam turbine (3), a speed reducer (4), a generator (5), a high rotational speed coupler (2) and the high rotational speed coupler protective cover (1) according to any one of claims 1 to 9, wherein the high rotational speed steam turbine (3) is connected with the speed reducer (4) through the high rotational speed coupler (2), the speed reducer (4) is connected with the generator (5), and the high rotational speed coupler protective cover (1) is arranged between the steam turbine (3) and the speed reducer (4) and covers the high rotational speed coupler (2).

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