Steam turbine air inlet protection device and steam turbine

Abstract

The invention belongs to the technical field of steam turbines, and particularly discloses a steam turbine air inlet protection device and a steam turbine. The steam turbine air inlet protection device comprises a fixing seat, a mounting seat, a driving assembly and a plugging assembly, the fixing seat is provided with a through hole and arranged on the inner wall of an air inlet pipeline, the outer circumferential face of the fixing seat is in sealed connection with the inner wall of the air inlet pipeline, and the axial direction of the through hole is parallel to the circumferential direction of the air inlet pipeline; the mounting seat is arranged on the side wall of the air inlet pipeline and is provided with a mounting cavity, and the mounting cavity is communicated with the air inlet pipeline; the driving assembly is arranged in the mounting cavity; the blocking assembly is arranged in the air inlet pipeline and connected with the driving assembly, and the driving assembly is used for driving the blocking assembly to block the through hole. According to the steam turbine air inlet protection device, the air inlet can be conveniently blocked, and the working efficiency can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of steam turbines, and in particular relates to a steam turbine air inlet protection device and a steam turbine. Background Art

[0002] When the steam turbine needs to be maintained or overhauled, a dedicated plugging device is usually used to seal the air inlet in order to isolate the steam system, ensure the safety of the staff, and prevent impurities from entering the steam turbine. In addition, during the long-term shutdown of the steam turbine, a plugging device is also used to block the air inlet to help prevent internal corrosion or water accumulation. However, the plugging device in the related art needs to be manually installed or disassembled, which is inconvenient to use and affects work efficiency. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a steam turbine air inlet protection device, which is convenient for blocking the air inlet and is conducive to improving work efficiency.

[0004] An embodiment of the present invention further provides a steam turbine.

[0005] The steam turbine air inlet protection device of the embodiment of the present invention comprises: a fixing seat, the fixing seat having a through hole, the fixing seat being arranged on the inner wall of the air intake pipe, and the outer peripheral surface of the fixing seat being sealed and connected to the inner wall of the air intake pipe, and the axial direction of the through hole is parallel to the circumferential direction of the air intake pipe; a mounting seat, the mounting seat being arranged on the side wall of the air intake pipe, the mounting seat having a mounting cavity and the mounting cavity is connected to the air intake pipe; a driving assembly, the driving assembly being arranged in the mounting cavity; a plugging assembly, the plugging assembly being arranged in the air intake pipe and the plugging assembly being connected to the driving assembly, and the driving assembly being used to drive the plugging assembly to plug the through hole.

[0006] It can be understood that by providing a fixed seat in the air intake pipe and providing a through hole in the fixed seat, when the steam turbine needs to be maintained or overhauled, the driving assembly can be controlled to drive the sealing assembly to seal the through hole on the fixed seat, thereby blocking the air intake pipe. When normal ventilation is required, the driving assembly is controlled to drive the sealing assembly to move out of the through hole. There is no need to install or disassemble the sealing assembly every time the air intake pipe needs to be sealed. This is easy to use and helps to improve work efficiency.

[0007] In this embodiment, the blocking assembly includes: a blocking plate, and the blocking plate is connected to the driving assembly.

[0008] In this embodiment, the blocking assembly further includes a guide member, which is connected to the blocking plate and passes through the fixing seat, and the guide member is movable relative to the fixing seat.

[0009] In this embodiment, two fixing seats are provided, and the two fixing seats are arranged at intervals along the gas flow direction of the air intake pipe. Two sealing components are provided, and the two sealing components are respectively connected to the driving components, and the two sealing components correspond one-to-one to the two fixing seats.

[0010] In this embodiment, the driving assembly includes: a driving member, which is arranged in the installation cavity; a piston, which is arranged in the installation cavity, and the driving member is used to drive the piston to move radially along the intake pipe; a connecting rod, one end of which is hinged to the piston; a transmission rod, one end of which is connected to the sealing assembly, and the other end of the transmission rod is hinged to the connecting rod, and the transmission rod can move axially along the intake pipe under the drive of the connecting rod.

[0011] In this embodiment, a connecting flange is provided at the end of the air intake pipe, a first sealing groove is provided on the end surface of the connecting flange, and an expansion ring is provided in the first sealing groove.

[0012] The steam turbine of this embodiment includes an air intake duct and the above-mentioned steam turbine air intake protection device, the fixing seat is arranged on the inner wall of the air intake duct, and the mounting seat is arranged on the side wall of the air intake duct.

[0013] In this embodiment, the steam turbine is characterized in that it also includes a lifting device and an air intake bin and a cylinder which are sequentially arranged from the air outlet end of the air intake pipe, and the lifting device is arranged on the outer peripheral wall of the cylinder.

[0014] In this embodiment, the lifting device includes: a slide rail, which is in a circular shape and is arranged on the outer wall of the cylinder; a slide seat, which is connected to the slide rail and is movable relative to the slide rail; and a lifting ring, which is arranged on the slide seat.

[0015] In this embodiment, the steam turbine also includes a gas condensation device, which includes: an exhaust bin, which is connected to the exhaust end of the cylinder, and the exhaust bin has an air cavity connected to the cylinder; a cooling component, which is arranged in the exhaust bin; a collecting component, which is connected to the air cavity to collect condensed water in the air cavity; and an exhaust pipeline, wherein the air inlet of the exhaust pipeline is connected to the air outlet of the exhaust bin. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the three-dimensional structure of a steam turbine according to an embodiment of the present invention;

[0017] Figure 2 is a schematic cross-sectional structural diagram of a steam turbine according to an embodiment of the present invention;

[0018] Figure 3 A three-dimensional diagram of a partial structure of a steam turbine according to an embodiment of the present invention Figure 1 ;

[0019] Figure 4 for Figure 3 A schematic diagram of the cutaway structure of part of the steam turbine;

[0020] Figure 5 It is a schematic structural diagram of a steam turbine air inlet protection device, a sealing ring, and an expansion ring according to an embodiment of the present invention;

[0021] Figure 6 A three-dimensional diagram of a partial structure of a steam turbine according to an embodiment of the present invention Figure 2 ;

[0022] Figure 7 It is a schematic diagram of the three-dimensional structure of the lifting device according to an embodiment of the present invention;

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of the slide seat and the lifting ring according to an embodiment of the present invention;

[0024] Fig. 9 It is a schematic structural diagram of a gas condensing device according to an embodiment of the present invention;

[0025] Fig.10 It is a schematic diagram of the cross-section structure of a gas condensation device according to an embodiment of the present invention.

[0026] Reference numerals:

[0027] 1. Cylinder; 2. Steam turbine; 3. Air inlet bin; 4. Air inlet pipe; 5. Steam turbine air inlet protection device; 501. Sealing ring; 502. Expansion ring; 503. Mounting seat; 504. Driving member; 505. Piston; 506. Connecting rod; 507. Articulated seat; 508. Blocking plate; 509. Transmission rod; 510. Limit block; 511. Guide rod; 512. Fixed seat; 6. Lifting device; 601. Slide rail; 602. Slide seat; 603. Lifting ring; 7. Gas condensing device; 701. Exhaust bin; 702. Cooling chamber; 703. Water inlet pipe; 704. Heat sink; 705. Heat absorption chamber; 706. Input pipe; 707. Output pipe; 708. Water pump; 709. Return pipe; 710. Exhaust pipeline. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0029] In this embodiment, if Figure 2 , Figure 4 and Figure 5 As shown, the turbine air inlet protection device includes a fixing seat 512, a mounting seat 503, a driving assembly and a sealing assembly, the fixing seat 512 has a through hole, the fixing seat 512 is arranged on the inner wall of the air intake pipe 4, and the outer peripheral surface of the fixing seat 512 is sealed and connected to the inner wall of the air intake pipe 4, and the axial direction of the through hole is parallel to the circumferential direction of the air intake pipe 4; the mounting seat 503 is arranged on the side wall of the air intake pipe 4, the mounting seat 503 has a mounting cavity, and the mounting cavity is connected to the air intake pipe 4; the driving assembly is arranged in the mounting cavity; the sealing assembly is arranged in the air intake pipe 4 and the sealing assembly is connected to the driving assembly, and the driving assembly is used to drive the sealing assembly to seal the through hole.

[0030] Specifically, Figure 5 As shown, the fixing seat 512 has a through hole through which gas can pass, so that steam can pass through the air inlet pipe 4 when the steam turbine is in normal use.

[0031] For example, the mounting seat 503 is cylindrical, one end of the mounting seat 503 is open and the other end is closed, and the open end of the mounting seat 503 faces the air intake pipeline, so that the mounting cavity and the air intake pipeline 4 are connected.

[0032] By setting a fixing seat 512 in the air intake pipe 4 and setting a through hole in the fixing seat 512, when the steam turbine needs to be maintained or overhauled, the driving component can be controlled to drive the sealing component to seal the through hole on the fixing seat 512, thereby blocking the air intake pipe. When normal ventilation is required, the driving component is controlled to drive the sealing component to move out of the through hole. There is no need to install or disassemble the sealing component every time the air intake pipe 4 needs to be sealed. This is easy to use and helps to improve work efficiency.

[0033] In this embodiment, if Figure 4 and Figure 5 As shown, the blocking assembly includes a blocking plate 508, which is connected to the driving assembly.

[0034] For example, the sealing plate 508 may be in a cone shape, and the end of the sealing plate 508 adjacent to the fixing seat 512 may have a smaller diameter. When the sealing plate 508 is inserted into the through hole, as the sealing plate 508 moves toward the through hole, the sealing plate 508 and the fixing seat 512 may be more tightly connected, thereby helping to improve the sealing effect between the sealing plate 508 and the inner wall of the through hole.

[0035] It can be understood that when the air intake duct 4 needs to be blocked, the blocking plate 508 is driven by the driving assembly to block the through hole, and the blocking plate 508 can be easily blocked or removed from the through hole.

[0036] In this embodiment, the blocking assembly further includes a guide member, which is connected to the blocking plate 508 and passes through the fixing seat 512 , and the guide member is movable relative to the fixing seat 512 .

[0037] Specifically, Figure 5 As shown, the guide member includes a plurality of guide rods 511, and the plurality of guide rods 511 are evenly spaced along the circumference of the blocking plate 508. The stability of the blocking plate 508 when moving can be improved by providing a plurality of guide rods 511. Furthermore, a limit block 510 is provided at one end of the guide rod 511 away from the blocking plate 508, and the limit block 510 and the blocking plate 508 are respectively located on both sides of the fixing seat 512. The limit block 510 can prevent the guide rod 511 from falling out of the fixing seat 512 when the blocking plate 508 moves in a direction away from the fixing seat 512, and can limit the resetting of the blocking plate 508.

[0038] It is understandable that the blocking assembly also includes a guide member. By providing the guide member to guide the blocking plate 508 when the blocking plate 508 moves, the blocking plate 508 can be stably moved so that it can be accurately inserted into the through hole of the fixing seat 512.

[0039] In this embodiment, if Figure 4 , Figure 5 As shown, there are two fixing seats 512 , which are spaced apart along the gas flow direction of the air intake pipe 4 , and there are two blocking components, which are respectively connected to the driving components, and the two blocking components correspond one to one to the two fixing seats 512 .

[0040] Specifically, the one-to-one correspondence between the two blocking components and the two fixing seats 512 means that each blocking component blocks a through hole of a fixing seat 512 .

[0041] It can be understood that by providing two fixing seats 512, each fixing seat 512 corresponds to a blocking component, and the through hole of the fixing seat 512 is blocked by the blocking component, and double blocking is helpful to improve the blocking effect.

[0042] In this embodiment, if Figure 5 As shown, the driving assembly includes a driving member 504, a piston 505, a connecting rod 506 and a transmission rod 509, the driving member 504 is arranged in the installation cavity; the piston 505 is arranged in the installation cavity, and the driving member 504 is used to drive the piston 505 to move radially along the intake pipe 4; one end of the connecting rod 506 is hinged to the piston 505; one end of the transmission rod 509 is connected to the blocking assembly, and the other end of the transmission rod 509 is hinged to the connecting rod 506, and the transmission rod 509 can move axially along the intake pipe 4 driven by the connecting rod 506.

[0043] Specifically, when two blocking assemblies are provided, the mounting seat 503 is provided between the two fixing seats 512 in the axial direction of the air intake pipe 4, and the two ends of the transmission rod 509 are respectively connected to a blocking plate 508, and as the transmission rod 509 moves along the axial direction of the air intake pipe 4, the two blocking plates 508 can be driven to move synchronously, so that the blocking plates 508 can block the through hole or be moved out of the through hole as needed. The transmission rod 509 and the connecting rod 506 are hinged by the hinge seat 507.

[0044] For example, the driving member 504 may be an electric push rod, which may push the piston 505 to move back and forth along the inner wall of the installation cavity.

[0045] It should be noted that when it is necessary to block the through hole of the fixed seat 512 by the blocking assembly, the driving member 504 drives the piston 505 to move toward the air intake pipe 4, the piston 505 drives the transmission rod 509 to move along the axial direction of the air intake pipe 4 through the connecting rod 506, and the transmission rod 509 drives the blocking assembly to block the through hole. When the blocking assembly is not needed to block the through hole of the fixed seat 512, the driving member 504 drives the piston 505 to move in the direction away from the air intake pipe 4, the piston 505 drives the transmission rod 509 to reset through the connecting rod 506, and the transmission rod 509 drives the blocking assembly to move in the opposite direction and move out of the through hole, so that the through hole can be ventilated normally. By setting the piston 505 to drive the connecting rod 506 to move, the piston 505 can guide the connecting rod 506, so that the connecting rod 506 can move stably along the preset direction. In addition, by setting the connecting rod 506 and the transmission rod 509 to cooperate to drive the blocking assembly to move, the structure is simple and easy to process and maintain.

[0046] In this embodiment, if Figures 1 to 5 As shown, a connecting flange is provided at the end of the air intake pipe 4, a first sealing groove is provided at the end surface of the connecting flange, and an expansion ring 502 is provided in the first sealing groove.

[0047] Specifically, the end surface of the connecting flange is further provided with a second sealing groove, in which a sealing ring 501 is provided, the first sealing groove and the second sealing groove are coaxially arranged, and the diameter of the second sealing groove is smaller than the diameter of the first sealing groove. By providing the sealing ring 501 on the cross section of the connecting flange, it is beneficial to improve the sealing performance of the connection between the air intake pipe 4 and the steam system, and it is beneficial to improve the safety during operation.

[0048] It is understandable that when steam enters the connection between the connecting flange and the steam system, the expansion ring 502 absorbs water and expands, thereby improving the sealing of the connection between the expansion ring 502 and the steam system and the connecting flange, which is beneficial to improving safety performance.

[0049] The steam turbine in this embodiment, such as Figures 1 to 4As shown, it includes an air intake pipe 4 and the above-mentioned turbine air intake protection device, the fixing seat 512 is arranged on the inner wall of the air intake pipe 4, and the mounting seat 503 is arranged on the side wall of the air intake pipe 4.

[0050] The steam turbine in this embodiment is provided with the above-mentioned steam turbine air inlet protection device on the air inlet pipe 4. When the steam turbine needs to be maintained or overhauled, the driving component can be controlled to drive the sealing component to seal the through hole on the fixing seat 512, thereby blocking the air inlet pipeline. When normal ventilation is required, the driving component is controlled to drive the sealing component to move out of the through hole. There is no need to install or disassemble the sealing component every time the air inlet pipe 4 needs to be sealed. It is easy to use and is conducive to improving work efficiency.

[0051] In this embodiment, if Figure 1 , Figure 2 and Figure 6 As shown, the steam turbine further includes a hoisting device 6 and an air intake bin 3 and a cylinder 1 which are sequentially arranged from the air outlet end of an air intake pipe 4 , and the hoisting device 6 is arranged on the outer peripheral wall of the cylinder 1 .

[0052] It can be understood that by arranging the hoisting device 6 on the outer peripheral wall of the cylinder 1, when hoisting and installation are required, auxiliary hoisting can be performed through the hoisting device 6, which is convenient to use.

[0053] In this embodiment, if Figures 6 to 8 As shown, the lifting device 6 includes a slide rail 601, a slide seat 602 and a lifting ring 603. The slide rail 601 is in a circular shape and is arranged on the outer peripheral wall of the cylinder 1; the slide seat 602 is connected to the slide rail 601 and is movable relative to the slide rail 601; the lifting ring 603 is arranged on the slide seat 602.

[0054] Specifically, the slide rail 601 is fixedly connected to the outer wall of the cylinder 1 through the support seat to limit the slide rail 601. For example, the support seat can be welded to the outer wall of the cylinder 1.

[0055] Furthermore, if Figures 7 and 8 As shown, a connecting sleeve is provided on one side of the lifting ring 603, two connecting lugs are provided at intervals on the sliding seat 602, and the connecting sleeve is rotatably connected between the two connecting lugs through a rotating shaft, so that the lifting ring 603 can rotate relative to the sliding seat 602, which can facilitate the connection of the lifting ring 603. The number of lifting rings 603 can be set as needed and is not limited here.

[0056] It can be understood that by setting the lifting ring 603 on the slide 602, the slide 602 can move relative to the slide rail 601. When the cylinder 1 is lifted by the lifting ring 603, the position of the lifting ring 603 remains unchanged and the cylinder 1 can be rotated, which improves the convenience of installing the cylinder 1 and is conducive to improving work efficiency.

[0057] In this embodiment, if Figure 1 , Figure 2 and Fig. 9 , Fig.10 As shown, the steam turbine also includes a gas condensing device 7, which includes an exhaust bin 701, a cooling component, a collecting component and an exhaust pipeline 710. The exhaust bin 701 is connected to the exhaust end of the cylinder 1, and the exhaust bin 701 has an air cavity connected to the cylinder 1; the cooling component is arranged in the exhaust bin 701; the collecting component is connected to the air cavity to collect condensed water in the air cavity; the air inlet of the exhaust pipeline 710 is connected to the air outlet of the exhaust bin 701.

[0058] Specifically, Fig.10 As shown, the cooling assembly includes a cooling cavity 702 arranged on the outer peripheral wall of the exhaust chamber 701, and the cooling cavity 702 is connected to a water inlet pipe 703 and a water outlet pipe. By delivering cooling water into the water inlet pipe 703 to perform heat exchange with the gas in the gas cavity, the gas in the gas cavity can be condensed, and the condensed water after condensation can be collected by the collection assembly. The cooling water in the cooling cavity 702 is discharged through the water outlet pipe.

[0059] Furthermore, if Fig.10 As shown, the cooling assembly also includes a heat sink 704, which is arranged in the middle of the air cavity. A heat absorption cavity 705 is arranged in the heat sink 704. The heat absorption cavity 705 is connected with an input pipe 706 and an output pipe 707. A cooling medium can be input into the heat absorption cavity 705 through the input pipe 706. For example, the cooling medium can be water. After the cooling medium in the heat absorption cavity 705 and the gas in the air cavity undergo heat exchange, the steam in the air cavity can be condensed, thereby further improving the condensation effect of the gas in the air cavity.

[0060] Specifically, Fig. 9 and Fig.10 As shown, the collection assembly includes an outlet pipe, a water pump 708 and a return pipe 709. The inlet of the outlet pipe is arranged at the bottom of the exhaust bin 701 and communicates with the air cavity. The inlet of the water pump 708 is connected to the outlet of the outlet pipe, and the inlet of the return pipe 709 is connected to the outlet of the water pump 708. The condensed water will flow to the bottom of the exhaust bin 701 under the action of gravity, and then the water pump 708 will be started to suck it away through the outlet pipe, and then the condensed water will be transported back to the boiler through the return pipe 709 to be used as feed water, thereby reducing the energy loss of steam and improving the utilization efficiency of thermal energy, so as to reduce the exhaust pressure and energy loss when the steam turbine is in use.

[0061] It can be understood that by providing a gas condensation device 7 at the gas outlet end of the cylinder 1, part of the steam entering the air cavity of the exhaust bin 701 can be condensed by a cooling component, and the condensed water is collected by a collecting component so that the condensed water can be recycled and reused. The gas that has not had time to condense is discharged through the exhaust pipe 710 to enter the next process.

[0062] When the steam turbine in this embodiment is used, the steam system is connected to the air intake pipe 4, and the high-temperature steam reaches the air intake bin 3 through the air intake pipe 4, and then enters the inside of the cylinder 1 through the air intake bin 3. The high-temperature steam contacts the steam turbine 2, so that the steam turbine 2 rotates to drive the external equipment to work, and then the steam reaches the exhaust bin 701 and is discharged through the exhaust pipe 710. By setting the steam turbine air intake protection device, when the steam turbine needs to be maintained or overhauled, the driving component can be controlled to drive the blocking component to block the through hole on the fixed seat 512, so that the air intake pipeline can be blocked. When normal ventilation is required, the driving component is controlled to drive the blocking component to move out of the through hole. It is not necessary to install or disassemble the blocking component every time the air intake pipe 4 needs to be blocked. It is easy to use and is conducive to improving work efficiency and safety performance. By setting the hoisting device 6, it is convenient for the staff to lift the cylinder 1, and after lifting, the cylinder 1 can be rotated for auxiliary installation. The steam temperature is lowered by the gas condensing device 7 and condensed into water, thereby reducing the exhaust pressure, and the condensed water is transported back to the boiler to complete the thermal cycle, thereby reducing the energy loss of the steam and improving the thermal energy utilization efficiency.

[0063] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A steam turbine air inlet protection device, characterized in that: include: A fixing seat, wherein the fixing seat has a through hole, the fixing seat is arranged on the inner wall of the air intake pipe, and the outer peripheral surface of the fixing seat is sealed and connected to the inner wall of the air intake pipe, and the axial direction of the through hole is parallel to the circumferential direction of the air intake pipe; A mounting seat, the mounting seat being arranged on a side wall of the air intake duct, the mounting seat having a mounting cavity and the mounting cavity being in communication with the air intake duct; A driving assembly, wherein the driving assembly is disposed in the mounting cavity; A plugging assembly is disposed in the air intake duct and is connected to the driving assembly, wherein the driving assembly is used to drive the plugging assembly to plug the through hole.

2. The steam turbine air inlet protection device according to claim 1, characterized in that: The blocking component comprises: A blocking plate is connected to the driving assembly.

3. The steam turbine air inlet protection device according to claim 2, characterized in that: The blocking assembly also includes a guide member, which is connected to the blocking plate and passes through the fixing seat, and the guide member is movable relative to the fixing seat.

4. The steam turbine air inlet protection device according to claim 1, characterized in that: There are two fixing seats, which are spaced apart along the gas flow direction of the air intake pipe. There are two blocking components, which are respectively connected to the driving components, and the two blocking components correspond one to one to the two fixing seats.

5. The steam turbine air inlet protection device according to claim 1, characterized in that: The drive assembly comprises: A driving member, wherein the driving member is disposed in the mounting cavity; A piston, wherein the piston is disposed in the mounting cavity, and the driving member is used to drive the piston to move radially along the air intake pipe; A connecting rod, one end of which is hinged to the piston; A transmission rod, one end of which is connected to the blocking assembly, and the other end of which is hinged to the connecting rod. The transmission rod can move axially along the air intake pipe driven by the connecting rod.

6. The steam turbine air inlet protection device according to claim 1, characterized in that: A connecting flange is provided at the end of the air intake pipe, a first sealing groove is provided on the end surface of the connecting flange, and an expansion ring is provided in the first sealing groove.

7. A steam turbine, characterized in that: It comprises an air intake pipe and a turbine air intake protection device according to any one of claims 1 to 6, wherein the fixing seat is arranged on the inner wall of the air intake pipe, and the mounting seat is arranged on the side wall of the air intake pipe.

8. The steam turbine according to claim 7, characterized in that It also includes a hoisting device and an air intake bin and a cylinder which are sequentially arranged from the air outlet end of the air intake pipe, and the hoisting device is arranged on the outer peripheral wall of the cylinder.

9. The steam turbine according to claim 8, characterized in that The lifting device comprises: A slide rail, the slide rail is in a circular shape and is arranged on the outer peripheral wall of the cylinder; A slide seat, the slide seat is connected to the slide rail and is movable relative to the slide rail; A lifting ring is arranged on the sliding seat.

10. The steam turbine according to claim 8, characterized in that Also included is a gas condensing device, the gas condensing device comprising: An exhaust chamber, the exhaust chamber is connected to the air outlet end of the cylinder, and the exhaust chamber has an air cavity communicated with the cylinder; A cooling assembly, wherein the cooling assembly is disposed in the exhaust chamber; A collecting component, the collecting component is in communication with the air cavity to collect condensed water in the air cavity; An exhaust pipeline, wherein an air inlet of the exhaust pipeline is connected to an air outlet of the exhaust bin.

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