Double-sealing equipment of steam turbine generator unit

Abstract

The invention discloses steam turbine generator unit double-sealing equipment, and relates to the technical field of steam turbine generator unit sealing, the steam turbine generator unit double-sealing equipment comprises a high-pressure cylinder body and a plurality of impellers installed in the high-pressure cylinder body through a rotor, one end of the high-pressure cylinder body is connected with a main shaft, and the steam turbine generator unit double-sealing equipment further comprises a sealing mechanism arranged on the high-pressure cylinder body and used for conducting double sealing on the main shaft. The sealing mechanism comprises a first sealing hole and a second sealing hole which are formed in the high-pressure cylinder body, the first sealing hole is fixedly connected with a first sealing ring, and the portion, located on the side wall of the second sealing hole, of the main shaft is sleeved with a plurality of fan-shaped sealing rings. According to the double-sealing equipment of the steam turbine generator unit, double sealing of the main shaft is formed through the arrangement of the sealing mechanism, and meanwhile, by means of the arrangement of the adjusting assembly, the risk that the main shaft excessively abuts against the fan-shaped sealing ring under high-temperature expansion is reduced while sealing of the main shaft is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine generator set sealing, in particular to a double sealing device for a steam turbine generator set. Background Art

[0002] A steam turbine generator set is an external combustion rotary machine that converts steam thermal energy into mechanical work. After the steam from the boiler enters the steam turbine, it passes through a series of annularly arranged nozzles and moving blades in sequence, converting the steam's thermal energy into mechanical energy for the rotation of the turbine rotor. Steam undergoes energy conversion in different ways in the steam turbine, forming steam turbines with different working principles. The steam turbine is mainly composed of a high-pressure cylinder, a medium-pressure cylinder and a low-pressure cylinder, and multiple sets of impellers are connected in the high-pressure cylinder, the medium-pressure cylinder and the low-pressure cylinder through rotors. At the same time, the rotor in the high-pressure cylinder is connected to the bearing box through the main shaft.

[0003] In the process of the main shaft passing through the high-pressure cylinder and connecting with the bearing box, in order to avoid the overflow of steam in the cylinder, a seal will be installed at the connection between the main shaft and the high-pressure cylinder. In the existing technology, sealing is mainly performed by sealing plates. However, when the steam turbine unit is running, the main shaft expands due to heat, which causes the sealing plate to wear more due to excessive contact with the main shaft, resulting in a shortened service life of the sealing plate, which causes the gap between the main shaft and the sealing plate to gradually increase, and the steam leakage rate increases accordingly. This not only causes energy waste and reduces the thermal efficiency of the steam turbine, but may also form a local high-temperature area at the leakage point, affecting the safe and stable operation of the equipment. At the same time, the existing sealing plate has a single sealing structure and the sealing effect is difficult to guarantee. For this reason, we propose a double sealing device for steam turbine generator sets. Summary of the Invention

[0004] The object of the present invention is to provide a double sealing device for a steam turbine generator set to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a double sealing device for a steam turbine generator set, comprising a high-pressure cylinder and a plurality of impellers mounted within the high-pressure cylinder via a rotor, one end of the high-pressure cylinder being connected to a main shaft, one end of the main shaft being disposed through the high-pressure cylinder and connected to an external bearing housing, and further comprising a sealing mechanism disposed within the high-pressure cylinder for double sealing the main shaft;

[0006] The sealing mechanism includes a first sealing hole and a second sealing hole opened in the high-pressure cylinder body, the first sealing hole is fixedly connected to a first sealing ring, the inner wall of the first sealing ring is fixedly connected to a plurality of first sealing teeth, the main shaft is fixedly connected to a sealing sleeve on the inner wall of the first sealing hole, the side wall of the sealing sleeve is fixedly connected to a plurality of second sealing teeth, each of the second sealing teeth is staggered with the first sealing teeth, the main shaft is sleeved with a plurality of sector-shaped sealing rings on the side wall of the second sealing hole, each of the sector-shaped sealing rings is connected by a rubber connecting strip, and the second sealing hole is provided with an adjustment component for automatically adjusting the gap between each sector-shaped sealing ring and the main shaft according to the expansion and contraction of the main shaft;

[0007] By adopting the above technical solution, a double seal is formed on the main shaft, thereby improving the sealing effect of the main shaft.

[0008] Preferably, the adjustment assembly includes a first adjusting ring and a second adjusting ring arranged in the second sealing hole, the first adjusting ring and the second adjusting ring being connected by a locking assembly, a plurality of U-shaped plates are provided in an annular array on opposite sides of the first adjusting ring and the second adjusting ring, each of the U-shaped plates is rotatably connected to a tightening roller, each of the tightening rollers is matched with a sector-shaped sealing ring, and each of the tightening rollers is fixedly connected to a fixing plate on a side away from the sector-shaped sealing ring, the first adjusting ring and the second adjusting ring are respectively provided with an extrusion assembly for squeezing each tightening roller, each of the tightening rollers is abutted against the side wall of the main shaft under the extrusion action of the extrusion assembly, and each of the fixing plates close to the sector-shaped sealing ring is connected to a connecting plate through a stroke amplification assembly, each of the connecting plates is provided with a pushing assembly for elastically pushing the sector-shaped sealing ring, and each of the pushing assemblies is provided with a plug-in assembly for plugging the sector-shaped sealing ring;

[0009] By adopting the above technical solution, the wear progress of the sector-shaped sealing ring is reduced.

[0010] Preferably, the pushing assembly includes a pushing box fixedly connected to the side of the connecting plate close to the sector-shaped sealing ring, the pushing box is slidably connected to the pushing plate, the side of the pushing plate away from the sector-shaped sealing ring is fixedly connected to a first spring, and one end of the first spring away from the pushing plate is connected to the inner wall of the pushing box;

[0011] By adopting the above technical solution, each sector-shaped sealing ring is abutted against the side wall of the main shaft.

[0012] Preferably, the plug assembly includes a plug hole opened on a side of each sector-shaped sealing ring close to the push box, each of the plug holes is slidably connected to a plug plate, and one end of each plug plate away from the sector-shaped sealing ring is connected to the push plate;

[0013] By adopting the above technical solution, the sector-shaped sealing ring can be connected and limited.

[0014] Preferably, the stroke amplification assembly includes a first rack plate fixedly connected to the side of the first adjusting ring close to the sector-shaped sealing ring, the first rack plate is meshed with a gear, the gear is connected to the fixed plate through a rotating shaft, the gear is meshed with a second rack plate on the side away from the first rack plate, the second rack plate is fixedly connected to the side away from the sector-shaped sealing ring, and the end of the stroke plate away from the fixed plate is connected to the connecting plate;

[0015] By adopting the above technical solution, the movement sensitivity of the pressing roller is improved.

[0016] Preferably, the extrusion assembly includes two first T-shaped rods fixedly connected to the first adjustment ring on a side close to the sector-shaped sealing ring, the two first T-shaped rods are respectively located on both sides of the fixed plate, the side walls of the two first T-shaped rods are slidably connected with the extrusion plates, the opposite ends of the two extrusion plates are connected to the fixed plate, the side walls of the two first T-shaped rods are sleeved with second springs, and the two ends of the second springs are respectively connected to the extrusion plate and the inner wall of the first adjustment ring;

[0017] By adopting the above technical solution, the pressing roller is always pushed against the side wall of the main shaft.

[0018] Preferably, the locking assembly includes two symmetrical operating plates fixedly connected to the two side walls opposite to the first adjusting ring, the four operating plates are fixedly connected to the locking plates on one side away from the first adjusting ring, the four locking plates are provided with mounting cavities, the four mounting cavities are provided with through holes on the inner walls on the one side away from the first adjusting ring, the four through holes are slidably connected with locking blocks, the two side walls opposite to the second adjusting ring are fixedly connected with two locking frames, the four locking frames are matched with the locking plates, the four locking plates are provided with driving components for driving the locking frames, the four locking blocks are provided with inclined surfaces on one side close to the locking frames, and the four mounting cavities are provided with telescopic parts for telescoping the locking blocks, the telescopic parts are third springs, and the two ends of the third springs are respectively connected to the locking block and the inner wall of the mounting cavity;

[0019] By adopting the above technical solution, the installation and disassembly between the first adjusting ring and the second adjusting ring can be achieved.

[0020] Preferably, the driving assembly includes a driving hole formed on a side of the locking plate away from the locking frame, the driving hole being slidably connected to the driving plate, one end of the driving plate being connected to the locking block, and the locking plate being provided with a blocking assembly for blocking the driving plate;

[0021] By adopting the above technical solution, the locking limit between the first adjusting ring and the second adjusting ring is released.

[0022] Preferably, the blocking assembly includes a blocking plate fixedly connected to a side of the locking plate away from the locking frame, the blocking plate being slidably connected to a second T-shaped rod, a side wall of the second T-shaped rod being sleeved with a fourth spring, one end of the fourth spring being connected to the blocking plate, and the other end of the fourth spring being connected to the side wall of the second T-shaped rod via a fixing ring;

[0023] By adopting the above technical solution, it is easy to release the locking limit between the locking block and the locking frame.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The double sealing device of the steam turbine generator set of the present invention forms a double seal on the main shaft through the setting of the sealing mechanism, thereby improving the sealing effect of the main shaft. At the same time, by utilizing the setting of the adjustment component, under the mutual cooperation of the pushing component, the plug-in component and the stroke amplification component, the fan-shaped sealing ring and the main shaft always maintain a constant extrusion pressure, thereby achieving the sealing of the main shaft while reducing the risk of excessive friction between the main shaft and the fan-shaped sealing ring due to high-temperature expansion, thereby reducing the wear progress of the fan-shaped sealing ring, and thus improving the timeliness of the sealing of the main shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic structural diagram of the first sealing hole and the second sealing hole of the present invention;

[0028] Figure 3 Schematic diagram of the installation position relationship of the sealing mechanism of the present invention on the main shaft;

[0029] Figure 4 It is a structural schematic diagram of the locking assembly of the present invention;

[0030] Figure 5 Schematic diagram of the internal structure of the locking assembly of the present invention;

[0031] Figure 6 This is a schematic diagram of the position structure of each sector-shaped sealing ring in the first adjustment ring and the second adjustment ring of the present invention;

[0032] Figure 7 A schematic diagram of the adjustment component and the stroke amplification component of the present invention;

[0033] Figure 8 for Figure 4 Enlarged view of point A in the middle;

[0034] Figure 9 for Figure 5 Enlarged view of point B in the middle;

[0035] Figure 10 for Figure 7 Enlarged view of point C in the middle;

[0036] Figure 11 for Figure 10 Enlarged view of point D in the middle.

[0037] In the figure: 101, high-pressure cylinder; 102, rotor; 103, impeller; 104, main shaft; 201, first sealing hole; 202, second sealing hole; 203, first sealing ring; 204, first sealing tooth; 205, sealing sleeve; 206, sector sealing ring; 207, rubber connecting strip; 208, second sealing tooth; 301, first adjusting ring; 302, second adjusting ring; 303, U-shaped plate; 304, pressing roller; 305, fixing plate; 306, connecting plate; 401, push box; 402, push plate; 403, first spring; 501 , plug-in hole; 502, plug-in plate; 601, first rack plate; 602, gear; 603, rotating shaft; 604, second rack plate; 605, stroke plate; 701, first T-bar; 702, extrusion plate; 703, second spring; 801, operating plate; 802, locking plate; 803, mounting cavity; 804, through hole; 805, locking block; 806, inclined plane; 807, locking frame; 809, third spring; 901, driving hole; 902, driving plate; 1001, blocking plate; 1002, second T-bar; 1003, fourth spring. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Example 1

[0040] See also Figures 1-11 The double sealing device of a steam turbine generator set shown in the figure includes a high-pressure cylinder 101 and a plurality of impellers 103 installed in the high-pressure cylinder 101 through a rotor 102. One end of the high-pressure cylinder 101 is connected to a main shaft 104. One end of the main shaft 104 is arranged to pass through the high-pressure cylinder 101 and is connected to an external bearing box. The device also includes a sealing mechanism provided on the high-pressure cylinder 101 for double sealing the main shaft 104.

[0041] The sealing mechanism includes a first sealing hole 201 and a second sealing hole 202 opened in the high-pressure cylinder body 101. The first sealing hole 201 is fixedly connected to a first sealing ring 203. A plurality of first sealing teeth 204 are fixedly connected to the inner wall of the first sealing ring 203. The main shaft 104 is fixedly connected to a sealing sleeve 205 on the inner wall of the first sealing hole 201. A plurality of second sealing teeth 208 are fixedly connected to the side wall of the sealing sleeve 205. Each second sealing tooth 208 is staggered with the first sealing teeth 204. The main shaft 104 is sleeved with a plurality of sector-shaped sealing rings 206 on the side wall of the second sealing hole 202. Each sector-shaped sealing ring 206 is connected by a rubber connecting strip 207. The second sealing hole 202 is provided with an adjustment component for automatically adjusting the gap between each sector-shaped sealing ring 206 and the main shaft 104 according to the expansion and contraction of the main shaft 104.

[0042] It should be noted here that: through the setting of the sealing mechanism, a double seal is formed on the main shaft 104, thereby improving the sealing effect of the main shaft 104. At the same time, by utilizing the setting of the adjustment component, under the mutual cooperation of the pushing component, the plug-in component and the stroke amplification component, the fan-shaped sealing ring 206 and the main shaft 104 always maintain a constant extrusion pressure, thereby achieving the sealing of the main shaft 104 while reducing the risk of excessive friction between the main shaft 104 and the fan-shaped sealing ring 206 due to high-temperature expansion, thereby reducing the wear progress of the fan-shaped sealing ring 206, thereby improving the timeliness of the sealing of the main shaft 104.

[0043] It is worth noting that: as an existing technology, the specific structure and working principle of the steam turbine generator set have been mastered by people in this field and will not be elaborated here.

[0044] See also Figure 6 、 Figure 7 、 Figure 10 and Figure 11The adjustment assembly shown in the figure includes a first adjustment ring 301 and a second adjustment ring 302 arranged in the second sealing hole 202. The first adjustment ring 301 and the second adjustment ring 302 are connected by a locking assembly. A plurality of U-shaped plates 303 are arranged in an annular array on the opposite side of the first adjustment ring 301 and the second adjustment ring 302. Each U-shaped plate 303 is rotatably connected to a tightening roller 304. Each tightening roller 304 is matched with the sector-shaped sealing ring 206. Each tightening roller 304 is fixedly connected to a fixed roller 304 on the side away from the sector-shaped sealing ring 206. The fixed plate 305, the first adjustment ring 301, and the second adjustment ring 302 are respectively provided with an extrusion assembly for squeezing each abutting roller 304. Each abutting roller 304 abuts against the side wall of the main shaft 104 under the extrusion action of the extrusion assembly. The side of each fixed plate 305 close to the sector-shaped sealing ring 206 is connected to a connecting plate 306 through a stroke amplification assembly. Each connecting plate 306 is provided with a pushing assembly for elastically pushing the sector-shaped sealing ring 206. Each pushing assembly is provided with a plug-in assembly for plugging the sector-shaped sealing ring 206.

[0045] It should be noted here that: by adjusting the setting of the components, while achieving sealing of the main shaft 104, the risk of excessive friction between the main shaft 104 and the fan-shaped sealing ring 206 due to high-temperature expansion is reduced, thereby reducing the wear progress of the fan-shaped sealing ring 206, thereby improving the timeliness of the sealing of the main shaft 104.

[0046] See also Figure 7 and Figure 11 The pushing assembly shown in the figure includes a pushing box 401 fixedly connected to the side of the connecting plate 306 close to the sector-shaped sealing ring 206, the pushing box 401 is slidably connected to the pushing plate 402, the side of the pushing plate 402 away from the sector-shaped sealing ring 206 is fixedly connected to the first spring 403, and the end of the first spring 403 away from the pushing plate 402 is connected to the inner wall of the pushing box 401;

[0047] It should be noted here that: by pushing the arrangement of the assembly, each sector-shaped sealing ring 206 is abutted against the side wall of the main shaft 104 .

[0048] See also Figure 6 and Figure 10 The plug assembly shown in the figure includes a plug hole 501 opened on the side of each sector-shaped sealing ring 206 close to the push box 401, each plug hole 501 is slidably connected to a plug board 502, and one end of each plug board 502 away from the sector-shaped sealing ring 206 is connected to the push plate 402;

[0049] It should be noted here that the plug-in assembly is provided to limit the connection of the sector-shaped sealing ring 206 .

[0050] See also Figure 10 and Figure 11 The stroke amplification assembly shown in the figure includes a first rack plate 601 fixedly connected to the side of the first adjustment ring 301 close to the sector-shaped sealing ring 206. The first rack plate 601 is meshed with a gear 602, and the gear 602 is connected to the fixed plate 305 through a rotating shaft 603. The gear 602 is meshed with a second rack plate 604 on the side away from the first rack plate 601. The second rack plate 604 is fixedly connected to the side away from the sector-shaped sealing ring 206 with a stroke plate 605. The end of the stroke plate 605 away from the fixed plate 305 is connected to the connecting plate 306.

[0051] It should be noted that the stroke amplification component is used to improve the movement sensitivity of the pressing roller 304;

[0052] It is worth noting that: in the transmission between the gear 602 and the first rack plate 601 and the second rack plate 604, assuming that the pitch radius of the gear 602 is r, when the gear 602 moves upward by a distance L, the angle θ of the gear 602 is r. L. Since the first rack plate 601 and the second rack plate 604 are respectively engaged with the gear 602, and they are symmetrically distributed about the gear 602, when the gear 602 rotates, the distance moved by the second rack plate 604 is related to the arc length of the movement of a certain point on the pitch circle of the gear 602. According to the gear rack transmission principle, the distance moved by the second rack plate 604 is S=rθ×2=2L, that is, when the clamping roller 304 drives the fixed plate 305 to move a certain distance, the meshing transmission of the gear 602 and the first rack plate 601 and the second rack plate 604 makes the moving distance of the second rack plate 604 twice the moving distance of the clamping roller 304, thereby amplifying the moving stroke of the connecting plate 306 connected to the second rack plate 604.

[0053] See also Figure 10 and Figure 11 The extrusion assembly shown in the figure includes two first T-shaped rods 701 fixedly connected to the side of the first adjustment ring 301 close to the sector-shaped sealing ring 206. The two first T-shaped rods 701 are respectively located on both sides of the fixed plate 305. The side walls of the two first T-shaped rods 701 are slidably connected to the extrusion plates 702. The opposite ends of the two extrusion plates 702 are connected to the fixed plate 305. The side walls of the two first T-shaped rods 701 are sleeved with second springs 703. The two ends of the two second springs 703 are respectively connected to the extrusion plates 702 and the inner wall of the first adjustment ring 301.

[0054] It should be noted here that the squeezing assembly is provided to push the pressing roller 304 to always press against the side wall of the main shaft 104 .

[0055] See also Figure 4 、 Figure 5 、 Figure 8 and Figure 9The locking assembly shown in the figure includes two symmetrically arranged operating plates 801 fixedly connected to the two opposite side walls of the first adjustment ring 301, and a locking plate 802 is fixedly connected to the side of the four operating plates 801 away from the first adjustment ring 301. The four locking plates 802 have mounting cavities 803. The inner walls of the four mounting cavities 803 on the side away from the first adjustment ring 301 have through holes 804. The four through holes 804 are slidably connected to locking blocks 805. The two opposite side walls of the second adjustment ring 302 There are two locking frames 807 fixedly connected, and the four locking frames 807 are matched with the locking plates 802. The four locking plates 802 are provided with a driving assembly for driving the locking frames 807. The four locking blocks 805 are provided with an inclined surface 806 on one side close to the locking frame 807. The four mounting cavities 803 are provided with a telescopic member for retracting the locking blocks 805. The telescopic member is a third spring 809. The two ends of the third spring 809 are respectively connected to the locking block 805 and the inner wall of the mounting cavity 803;

[0056] It should be noted that the locking assembly is provided to facilitate installation and removal of the first adjustment ring 301 and the second adjustment ring 302 , thereby facilitating installation and removal of each sector sealing ring 206 .

[0057] See also Figure 8 and Figure 9 The driving assembly shown in the figure includes a driving hole 901 formed on the side of the locking plate 802 away from the locking frame 807. The driving hole 901 is slidably connected to the driving plate 902. One end of the driving plate 902 is connected to the locking block 805. The locking plate 802 is provided with a blocking assembly for blocking the driving plate 902.

[0058] It should be noted here that the drive assembly is provided to release the locking limit between the first adjustment ring 301 and the second adjustment ring 302 .

[0059] See also Figure 4 and Figure 9 The blocking assembly shown in the figure includes a blocking plate 1001 fixedly connected to the side of the locking plate 802 away from the locking frame 807, the blocking plate 1001 is slidably connected to the second T-shaped rod 1002, and the side wall of the second T-shaped rod 1002 is sleeved with a fourth spring 1003, one end of the fourth spring 1003 is connected to the blocking plate 1001, and the other end of the fourth spring 1003 is connected to the side wall of the second T-shaped rod 1002 through a fixing ring;

[0060] It should be noted here that: through the setting of the blocking component, it is used to provide a blocking limit when the drive plate 902 is pulled, thereby facilitating the release of the locking limit between the locking block 805 and the locking frame 807, and then used to release the locking limit between the first adjustment ring 301 and the second adjustment ring 302.

[0061] In this solution: A double sealing device for a steam turbine generator set includes the following steps:

[0062] When installing the double sealing device of the main shaft 104, first pre-install and fix the second adjusting ring 302 or the first adjusting ring 301 in the high-pressure cylinder 101, then install the sealing sleeve 205 on the side wall of the main shaft 104 by interference fit, and sleeve the sector sealing rings 206 connected by the rubber connecting strip 207 on the side wall of the main shaft 104. In the process of installing the sealing sleeve 205, the first sealing ring 203 will be sleeved on the side wall of the main shaft 104 at the same time, then the main shaft 104 is placed in the high-pressure cylinder 101, and the first sealing ring 203 is matched with the first sealing hole 201 and the sector sealing rings 206 are placed in the second adjusting ring 302 in the second sealing hole 202. Finally, the first sealing ring 203 is fixed to the first sealing hole 201, and the two ends of the main shaft 104 are connected to the rotor 102 and the bearing box respectively.

[0063] After each sector sealing ring 206 is installed in the second adjusting ring 302, one end of the first adjusting ring 301 can be aligned with the second adjusting ring 302, and the first adjusting ring 301 can be pushed to move closer to the second adjusting ring 302. In the process of the first adjusting ring 301 moving closer to the second adjusting ring 302, when the locking block 805 on one side of the locking plate 802 abuts against the locking frame 807 of the second adjusting ring 302, the interaction force of the inclined surface 806 and the guide force of the through hole 804 will cause the first adjusting ring 301 to move closer to the second adjusting ring 302. Under the action of the third spring 809, the locking block 805 is pushed to retract into the installation cavity 803. As the first adjustment ring 301 is continuously pushed, when the locking block 805 moves out from one side of the locking frame 807, the locking block 805 is moved out of the installation cavity 803 under the elastic action of the third spring 809, so that the locking block 805 abuts against the side wall of the locking frame 807. Then, under the abutting action of the locking block 805, the connection and locking of the first adjustment ring 301 and the second adjustment ring 302 are achieved.

[0064] At the same time, when each sector-shaped sealing ring 206 is installed in the first adjustment ring 301 and the second adjustment ring 302, each plug-in plate 502 will be plugged into the plug-in hole 501, thereby limiting the position of each sector-shaped sealing ring 206. At the same time, under the elastic action of the pushing component, each sector-shaped sealing ring 206 will be squeezed, thereby causing each sector-shaped sealing ring 206 to abut against the side wall of the main shaft 104, thereby forming a seal for the main shaft 104.

[0065] When the steam turbine generator set is in operation, when steam enters the high-pressure cylinder 101, the staggered first sealing teeth 204 and the second sealing teeth 208 will maintain a very small radial gap with the main shaft 104. When the steam is in the gap between the first sealing teeth 204 and the second sealing teeth 208, the passage suddenly narrows, the steam flow rate increases, and the pressure decreases. After entering the cavity of the first sealing teeth 204 and the second sealing teeth 208, the flow rate decreases and the pressure is partially restored, but it is always lower than the upstream pressure. Therefore, through the process of multiple throttling and pressure reduction, the steam leakage is effectively blocked, thereby forming a first seal for the main shaft 104. At the same time, because each sector-shaped sealing ring 206 is pressed against the side wall of the main shaft 104 under the action of the pushing assembly, the second seal for the main shaft 104 is achieved under the steam blocking effect of each sector-shaped sealing ring 206, thereby forming a double seal for the main shaft 104, thereby improving the sealing effect of the main shaft 104.

[0066] When steam flows in the high-pressure cylinder 101 for a long time, the main shaft 104 will be heated and expanded. During the expansion of the main shaft 104, the abutting rollers 304 will be pushed to move away from each other. During the process of the abutting rollers 304 moving away from each other, the gears 602 will be synchronously driven to move. During the movement of the gears 602, they will rotate due to meshing with the first rack plate 601, and then when meshing with the second rack plate 604, they will drive the second rack plate 604 to move. According to the transmission principle of the gears 602 and the first rack plate 601 and the second rack plate 604, the movement stroke of the second rack plate 604 will be significantly greater than the movement distance of the abutting roller 304, thereby improving the movement sensitivity of the abutting roller 304.

[0067] And during the movement of the second rack plate 604, the push box 401 on the side of the connecting plate 306 will be synchronously driven to move, and then the plug-in plate 502 will be driven to move. Therefore, through the movement of the plug-in plate 502, the plug-in plate 502 can always maintain a constant squeezing force on the fan-shaped sealing ring 206 when it is elastically pushed by the pushing component, and thus the fan-shaped sealing ring 206 and the main shaft 104 always maintain a constant squeezing force, thereby achieving the sealing of the main shaft 104 while reducing the risk of excessive friction between the main shaft 104 and the fan-shaped sealing ring 206 due to high-temperature expansion, thereby reducing the wear progress of the fan-shaped sealing ring 206, and thus improving the sealing timeliness of the main shaft 104.

[0068] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0069] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A double sealing device for a steam turbine generator set, comprising: A high-pressure cylinder and a plurality of impellers mounted in the high-pressure cylinder via a rotor, one end of the high-pressure cylinder being connected to a main shaft, one end of the main shaft being arranged through the high-pressure cylinder and connected to an external bearing box; It is characterized by further comprising: A sealing mechanism provided in the high-pressure cylinder body for double sealing the main shaft; The sealing mechanism includes a first sealing hole and a second sealing hole opened in the high-pressure cylinder body, the first sealing hole is fixedly connected to a first sealing ring, the inner wall of the first sealing ring is fixedly connected to a plurality of first sealing teeth, the main shaft is fixedly connected to a sealing sleeve on the inner wall of the first sealing hole, the side wall of the sealing sleeve is fixedly connected to a plurality of second sealing teeth, each of the second sealing teeth is staggered with the first sealing teeth, the side wall of the second sealing hole of the main shaft is sleeved with a plurality of sector-shaped sealing rings, each of the sector-shaped sealing rings is connected by a rubber connecting strip, and the second sealing hole is provided with an adjustment component for automatically adjusting the gap between each sector-shaped sealing ring and the main shaft according to the expansion and contraction of the main shaft.

2. The double sealing device for a steam turbine generator set according to claim 1, characterized in that: The adjustment assembly includes a first adjusting ring and a second adjusting ring arranged in the second sealing hole, the first adjusting ring and the second adjusting ring are connected by a locking assembly, and a plurality of U-shaped plates are arranged in a ring array on the opposite side of the first adjusting ring and the second adjusting ring, each of the U-shaped plates is rotatably connected to a clamping roller, and each of the clamping rollers is matched with a fan-shaped sealing ring, and each of the clamping rollers is fixedly connected to a fixed plate on a side away from the fan-shaped sealing ring, and the first adjusting ring and the second adjusting ring are respectively provided with an extrusion assembly for squeezing each clamping roller, and each of the clamping rollers is pressed against the side wall of the main shaft under the extrusion action of the extrusion assembly, and each of the fixed plates close to the fan-shaped sealing ring is connected to a connecting plate through a stroke amplification assembly, and each of the connecting plates is provided with a pushing assembly for elastically pushing the fan-shaped sealing ring, and each of the pushing assemblies is provided with a plug-in assembly for plugging the fan-shaped sealing ring.

3. The double sealing device for a steam turbine generator set according to claim 2, characterized in that: The pushing assembly includes a pushing box fixedly connected to the side of the connecting plate close to the fan-shaped sealing ring, the pushing box is slidably connected to the pushing plate, the side of the pushing plate away from the fan-shaped sealing ring is fixedly connected to the first spring, and the end of the first spring away from the pushing plate is connected to the inner wall of the pushing box.

4. The double sealing device for a steam turbine generator set according to claim 3, characterized in that: The plug assembly includes a plug hole opened on the side of each fan-shaped sealing ring close to the push box, each plug hole is slidably connected to a plug plate, and one end of each plug plate away from the fan-shaped sealing ring is connected to the push plate.

5. The double sealing device for a steam turbine generator set according to claim 4, characterized in that: The stroke amplification assembly includes a first rack plate fixedly connected to the side of the first adjusting ring close to the sector-shaped sealing ring, the first rack plate is meshed with a gear, the gear is connected to the fixed plate through a rotating shaft, the gear is meshed with a second rack plate on the side away from the first rack plate, the second rack plate is fixedly connected to the side away from the sector-shaped sealing ring, and the end of the stroke plate away from the fixed plate is connected to the connecting plate.

6. The double sealing device for a steam turbine generator set according to claim 5, characterized in that: The extrusion assembly includes two first T-shaped rods fixedly connected to the side of the first adjustment ring close to the fan-shaped sealing ring, the two first T-shaped rods are respectively located on both sides of the fixed plate, the side walls of the two first T-shaped rods are slidably connected with the extrusion plate, the opposite ends of the two extrusion plates are connected to the fixed plate, the side walls of the two first T-shaped rods are sleeved with second springs, and the two ends of the second springs are respectively connected to the extrusion plate and the inner wall of the first adjustment ring.

7. The double sealing device for a steam turbine generator set according to claim 6, characterized in that: The locking assembly includes two symmetrically arranged operating plates fixedly connected to the two opposite side walls of the first adjusting ring, the four operating plates are fixedly connected to a locking plate on the side away from the first adjusting ring, the four locking plates are provided with mounting cavities, the four mounting cavities are provided with through holes on the inner walls on the side away from the first adjusting ring, the four through holes are slidably connected with locking blocks, the two opposite side walls of the second adjusting ring are fixedly connected to two locking frames, the four locking frames are matched with the locking plates, and the four locking plates are provided with a driving assembly for driving the locking frames.

8. The double sealing device for a steam turbine generator set according to claim 7, characterized in that: The four locking blocks are provided with an inclined surface on one side close to the locking frame, and the four mounting cavities are provided with a telescopic part for extending and retracting the locking blocks. The telescopic part is a third spring, and the two ends of the third spring are respectively connected to the locking block and the inner wall of the mounting cavity.

9. The double sealing device for a steam turbine generator set according to claim 8, characterized in that: The driving assembly includes a driving hole opened on the side of the locking plate away from the locking frame, the driving hole is slidably connected to the driving plate, one end of the driving plate is connected to the locking block, and the locking plate is provided with a blocking assembly for blocking the driving plate.

10. The double sealing device for a steam turbine generator set according to claim 9, characterized in that: The blocking assembly includes a blocking plate fixedly connected to the side of the locking plate away from the locking frame, the blocking plate is slidably connected to a second T-bar, the side wall of the second T-bar is sleeved with a fourth spring, one end of the fourth spring is connected to the blocking plate, and the other end of the fourth spring is connected to the side wall of the second T-bar through a fixing ring.

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