Vacuum isolation system and device for steam turbine condenser of power plant

Abstract

The invention discloses a power plant steam turbine condenser vacuum isolation system and device which comprises an A-side condenser and a B-side condenser. The steam conveying part is arranged on the A-side condenser and the B-side condenser; the pre-extraction part is arranged on the steam conveying part; wherein when the A-side condenser or the B-side condenser is overhauled and recovered, the A-side condenser or the B-side condenser is subjected to pre-vacuumizing through the pre-vacuumizing part, so that the pressure of the A-side condenser and the pressure of the B-side condenser are balanced; by arranging the pre-pumping part, when the A-side condenser or the B-side condenser is overhauled and recovered, vacuum can be independently established for the A-side condenser or the B-side condenser to be put into use, vacuum reduction of the A-side condenser or the B-side condenser caused by recovery operation is avoided, it is guaranteed that the vacuum of the A-side condenser and the vacuum of the B-side condenser are stable and not interfered with each other during operation, and the service life of the A-side condenser and the B-side condenser is prolonged. And the conventional recovery process does not need to depend on experienced operators, so that the risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of fire safety, and in particular to a vacuum isolation system and device for a steam turbine condenser in a power plant. Background Technology

[0002] Currently, during the operation of thermal power units, when the steam-driven feedwater pumps running in parallel need to be restored after maintenance, the exhaust pipes of both small steam turbines are connected to the small turbine vacuum pumps, making the system closely interconnected. When one of the steam-driven feedwater pumps needs to be restored after maintenance, the restoration operation can easily cause the condenser vacuum of the other operating steam turbine to drop, or even trigger a trip, resulting in unplanned unit shutdown. The conventional restoration process requires experienced operators to manually and slowly operate on-site, which is risky, difficult to control, and requires strict personnel coordination. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention is proposed.

[0004] The above-mentioned technical problems are solved by the following technical solution: This invention proposes a vacuum isolation system and device for a steam turbine condenser in a power plant, comprising an A-side condenser and a B-side condenser; a steam conveying component disposed on the A-side condenser and the B-side condenser; and a pre-evacuation section disposed on the steam conveying component; wherein, when the A-side condenser or the B-side condenser is restored after maintenance, the pre-evacuation section is used to pre-evacuate the A-side condenser or the B-side condenser to balance the pressure of the A-side condenser and the B-side condenser.

[0005] In a preferred embodiment of the vacuum isolation system and device for a power plant turbine condenser according to the present invention: the steam transmission component includes a first pipeline provided on the A-side condenser and the B-side condenser, a second pipeline is provided on both first pipelines, and a first valve is provided on both first pipelines; wherein, the two first pipelines are fixedly connected to the A-side condenser and the B-side condenser respectively.

[0006] In a preferred embodiment of the vacuum isolation system and device for a power plant turbine condenser according to the present invention: the pre-evacuation section includes a first pre-evacuation pipeline provided on two first pipelines, a second pre-evacuation pipeline and a bypass pipeline provided on the first pre-evacuation pipeline, a second valve provided on the first pre-evacuation pipeline, a third valve and a pre-evacuation vacuum pump provided on the second pre-evacuation pipeline, and a fourth valve and a fifth valve provided on the bypass pipeline; wherein, the bypass pipeline is fixedly connected to the first bypass.

[0007] In a preferred embodiment of the vacuum isolation system and device for a power plant turbine condenser according to the present invention: a first valve stem, a second valve stem, and a third valve stem are respectively disposed on a second valve, a third valve, and a fourth valve; a linkage part includes a first linkage member disposed on the first valve stem and the second valve stem, and a second linkage member disposed on the first valve stem and the third valve stem; a switching member is disposed between the first linkage member and the second linkage member; and a locking member is disposed on the switching member; wherein, the switching member enables the switching of the first linkage member and the second linkage member, and the locking member moves synchronously with the switching member.

[0008] In a preferred embodiment of the vacuum isolation system and device for a power plant turbine condenser described in this invention: the first linkage includes a first transmission wheel disposed on a first valve stem, a second transmission wheel disposed on a second valve stem, and a first transmission belt is connected to both the first transmission wheel and the second transmission wheel for transmission.

[0009] In a preferred embodiment of the vacuum isolation system and device for a power plant turbine condenser described in this invention: the second linkage includes a third transmission wheel disposed on a first valve stem, a fourth transmission wheel disposed on the third valve stem, and a second transmission belt is connected to both the third and fourth transmission wheels; wherein the third transmission wheel is located directly above the first transmission wheel.

[0010] In a preferred embodiment of the vacuum isolation system and device for a power plant turbine condenser according to the present invention: the switching component includes a switching seat disposed on a first valve stem, the side wall of the switching seat is provided with two first gears, both the two first gears and the side wall of the switching seat are provided with through grooves, the through grooves are provided with sliding grooves, the first valve stem is provided with a fixing rod, and the side walls of the first transmission wheel and the third transmission wheel are provided with first tooth grooves; wherein, the switching seat is located between the first transmission wheel and the third transmission wheel.

[0011] In a preferred embodiment of the vacuum isolation system and device for a power plant turbine condenser described in this invention: the switching component further includes a support frame disposed on the first valve, the support frame being provided with a motor and an electric push rod; wherein, the output end of the motor is fixedly connected to the first valve stem.

[0012] In a preferred embodiment of the vacuum isolation system and device for a power plant turbine condenser described in this invention: the locking member includes a connecting seat disposed on the outer surface of the switching seat, a first locking rod and a second locking rod are fixedly connected to the outer surface of the connecting seat, a first locking groove is provided on the second transmission wheel, and a second locking groove is provided on the fourth transmission wheel.

[0013] In a preferred embodiment of the vacuum isolation system and device for a power plant turbine condenser described in this invention, a manual component is further included on the second and third valve stems. The manual component includes a fixed seat on the second and third valve stems. Both the second and third valve stems have grooves, and a manual lever is provided in the grooves. A second gear is provided at the bottom of the manual lever, and a second tooth groove is provided on the bottom wall of the groove. A connecting block is fixedly connected to the outer surface of the manual lever. A vertical groove is provided in the fixed seat, and a rotation groove and a limiting groove are provided in the vertical groove. The second gear meshes with the second tooth groove.

[0014] The beneficial effects of this invention are as follows: By setting a pre-evacuation section, when the A-side condenser or B-side condenser is restored after maintenance, a vacuum can be established separately for the A-side condenser or B-side condenser to be put into operation, avoiding the vacuum drop of the A-side condenser or B-side condenser during the restoration operation, ensuring that the vacuum of the A-side condenser and B-side condenser is stable and does not interfere with each other during operation, and no experienced operators are required during the routine restoration process, reducing the risk. At the same time, by setting a linkage section, switching component and locking component, the first valve stem and the second valve stem can be operated synchronously and the third valve stem can be locked, or the first valve stem and the third valve stem can be operated synchronously and the second valve stem can be locked. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein: Figure 1 A schematic diagram of the overall vacuum isolation system of the steam turbine condenser in a power plant is shown. Figure 2 A schematic diagram of the overall vacuum isolation system of the steam turbine condenser in a power plant is shown. Figure 3 A schematic diagram of the overall vacuum isolation device for the steam turbine condenser in a power plant is shown. Figure 4 A schematic diagram of the overall vacuum isolation device for the steam turbine condenser in a power plant is shown. Figure 5 A schematic diagram of the first drive wheel of the vacuum isolation device for the steam turbine condenser in a power plant is shown. Figure 6 This diagram shows a partial structural connection of the vacuum isolation device for the steam turbine condenser in a power plant. Figure 7 A partial structural schematic diagram of the vacuum isolation device for the steam turbine condenser in a power plant is shown. Figure 8 A schematic diagram of the switching components of the vacuum isolation device for the steam turbine condenser in a power plant is shown. Figure 9A cross-sectional view of the vacuum isolation device for the steam turbine condenser in a power plant is shown. Figure 10 A schematic diagram of the manual lever of the vacuum isolation device for the steam turbine condenser in a power plant is shown. Figure 11 A partial structural schematic diagram of the vacuum isolation device for the steam turbine condenser in a power plant is shown. Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0018] Example 1 Reference Figure 1 This embodiment provides a vacuum isolation system and device for a steam turbine condenser in a power plant, including an A-side condenser 1 and a B-side condenser 2; a steam conveying component 3 disposed on the A-side condenser 1 and the B-side condenser 2; and a pre-evacuation section 4 disposed on the steam conveying component 3. When the A-side condenser 1 or the B-side condenser 2 is restored after maintenance, the pre-evacuation section 4 is used to pre-evacuate the A-side condenser 1 or the B-side condenser 2 to balance the pressure of the A-side condenser 1 and the B-side condenser 2.

[0019] Specifically, under normal operating conditions, condenser 1 on side A and condenser 2 on side B are put into operation simultaneously. The gas in condenser 1 on side A and condenser 2 on side B is transported to the vacuum pump through the conveyor. When condenser 1 on side A or condenser 2 on side B needs to be put back into operation after maintenance, the pre-evacuation section 4 is used to pre-evacuate condenser 1 on side A or condenser 2 on side B until the pressure of condenser 1 on side A and condenser 2 on side B is balanced, thus establishing a vacuum for condenser 1 on side A or condenser 2 on side B to be put into operation.

[0020] Example 2 Reference Figures 1 to 2 This embodiment differs from the first embodiment in that the steam transmission component 3 includes a first pipeline 31 disposed on the A-side condenser 1 and the B-side condenser 2, a second pipeline 32 is provided on both first pipelines 31, and a first valve 33 is provided on both first pipelines 31; wherein, the two first pipelines 31 are fixedly connected to the A-side condenser 1 and the B-side condenser 2 respectively.

[0021] Specifically, the two first pipelines 31 are connected to the A-side condenser 1 and the B-side condenser 2 respectively, the first valve 33 is fixedly installed on the first pipeline 31, and the two first pipelines 31 are fixedly connected to the second pipeline 32.

[0022] The pre-extraction section 4 includes a first pre-extraction pipeline 41 provided on two first pipelines 31. The first pre-extraction pipeline 41 is provided with a second pre-extraction pipeline 42 and a bypass pipeline 43. The first pre-extraction pipeline 41 is provided with a second valve 44. The second pre-extraction pipeline 42 is provided with a third valve 45 and a pre-extraction vacuum pump 46. The bypass pipeline 43 is provided with a fourth valve 47 and a fifth valve 48. The bypass pipeline 43 is fixedly connected to the first bypass.

[0023] Specifically, two first pre-extraction pipelines 41 are fixedly connected to corresponding first pipelines 31, and the two first pre-extraction pipelines 41 are connected to corresponding first pipelines 31. The first pre-extraction pipeline 41 is fixedly connected to the second pre-extraction pipeline 42 and the bypass pipeline 43. The first pre-extraction pipeline 41 is connected to the second pre-extraction pipeline 42 and the bypass pipeline 43. The second valve 44 is fixedly installed on the first pre-extraction pipeline 41. The third valve 45 and the pre-extraction vacuum pump 46 are fixedly installed on the second pre-extraction pipeline 42. The fourth valve 47 and the fifth valve 48 are fixedly installed on the bypass pipeline 43, and the bypass pipeline 43 is connected to the first bypass.

[0024] In use, in conjunction with Embodiment 1, under normal operating conditions, the two first valves 33 are opened simultaneously, so that the gas in the A-side condenser 1 and the B-side condenser 2 is transported to the vacuum pump through the first pipeline 31 and the second pipeline 32; When condenser 1 on side A needs to be put back into use after maintenance, the second valve 44 and the third valve 45 are activated to allow the gas in condenser 1 on side A to be transported to the pre-vacuum pump 46 through the first pre-vacuum pipeline 41 and the second pre-vacuum pipeline 42, achieving pre-vacuuming. After the pressure of condenser 1 on side A and condenser 2 on side B is balanced, the third valve 45 is closed and the fourth valve 47 and the fifth valve 48 are opened to allow the gas in condenser 1 on side A to be transported to the vacuum pump through the first pre-vacuum pipeline 41, the bypass pipeline, the first pipeline 31 and the second pipeline 32. When condenser 2 on side B needs to be put back into use after maintenance, the same steps are repeated to establish a vacuum for condenser 1 on side A or condenser 2 on side B, which avoids the vacuum drop of condenser 1 on side A or condenser 2 on side B during the restoration operation. This ensures that the vacuum of condenser 1 on side A and condenser 2 on side B is stable and does not interfere with each other during operation. Moreover, the normal restoration process does not require experienced operators, reducing risks.

[0025] Example 3 Reference Figures 1 to 6This embodiment differs from the second embodiment in that the first valve stem 441, the second valve stem 451, and the third valve stem 461 are respectively disposed on the second valve 44, the third valve 45, and the fourth valve 47; the linkage part 5 includes a first linkage member 51 disposed on the first valve stem 441 and the second valve stem 451, and a second linkage member 52 disposed on the first valve stem 441 and the third valve stem 461; a switching member 6 is disposed between the first linkage member 51 and the second linkage member 52; and a locking member 7 is disposed on the switching member 6; wherein, the switching member 6 realizes the switching of the first linkage member 51 and the second linkage member 52, and the locking member 7 moves synchronously with the switching member 6.

[0026] Specifically, the first valve stem 441, the second valve stem 451, and the third valve stem 461 can respectively control the valve cores within the second valve 44, the third valve 45, and the fourth valve 47, thereby controlling the opening and closing of the second valve 44, the third valve 45, and the fourth valve 47. When the switching element 6 moves downward, the first valve stem 441 and the second valve stem 451 form a linked engagement state through the first linkage element 51, allowing the first valve stem 441 and the second valve stem 451 to rotate simultaneously. When the switching element 6 moves upward, the first valve stem 441 and the third valve stem 461... 1. A linkage engagement is formed through the second linkage member 52, enabling the first valve stem 441 and the third valve stem 461 to rotate simultaneously. At the same time, the locking member 7 moves synchronously with the switching member 6. When the first valve stem 441 and the second valve stem 451 are in a linkage engagement state, the locking member 7 locks the third valve stem 461 to prevent it from being accidentally opened. When the first valve stem 441 and the third valve stem 461 are in a linkage engagement state, the locking member 7 locks the second valve stem 451 to prevent it from being accidentally opened.

[0027] Example 4 Reference Figures 1 to 8 This embodiment differs from the third embodiment in that the first linkage 51 includes a first transmission wheel 511 disposed on the first valve stem 441, a second transmission wheel 512 disposed on the second valve stem 451, and a first transmission belt 513 is connected to the first transmission wheel 511 and the second transmission wheel 512 for transmission.

[0028] Specifically, the first transmission wheel 511 is rotatably connected to the first valve stem 441, so that in the initial state, the first valve stem 441 cannot drive the first transmission wheel 511 to rotate, and the second transmission wheel 512 is fixedly connected to the second valve stem 451.

[0029] The second linkage 52 includes a third transmission wheel 521 disposed on the first valve stem 441, a fourth transmission wheel 522 disposed on the third valve stem 461, and a second transmission belt 523 connected to the third transmission wheel 521 and the fourth transmission wheel 522 for transmission; wherein, the third transmission wheel 521 is located directly above the first transmission wheel 511.

[0030] Specifically, the third transmission wheel 521 is rotatably connected to the first valve stem 441, so that in the initial state, the first valve stem 441 cannot drive the third transmission wheel 521 to rotate, and the fourth transmission wheel 522 is fixedly connected to the third valve stem 461.

[0031] The switching component 6 includes a switching seat 61 disposed on the first valve stem 441. The side wall of the switching seat 61 is provided with two first gears 62. Both the two first gears 62 and the side wall of the switching seat 61 are provided with through grooves 63. The through grooves 63 are provided with sliding grooves 64. The first valve stem 441 is provided with a fixing rod 65. The side walls of the first transmission wheel 511 and the third transmission wheel 521 are provided with first tooth grooves 66. The switching seat 61 is located between the first transmission wheel 511 and the third transmission wheel 521.

[0032] Specifically, the two gears are symmetrically arranged, and multiple sliding grooves 64 and fixing rods 65 are provided. The multiple sliding grooves 64 and multiple fixing rods 65 are arranged in a circular array. The two gears are fixedly connected to the switching seat 61, and the fixing rods 65 are fixedly connected to the first valve stem 441. The sliding grooves 64 and the fixing rods 65 are adapted to each other. The two first gears 62 and the switching seat 61 can move longitudinally on the first valve stem 441 through the through grooves 63, sliding grooves 64 and fixing rods 65. The two first gears 62 are respectively meshed with the two first tooth grooves 66.

[0033] The switching component 6 also includes a support frame 67 mounted on the first valve 33, and the support frame 67 is equipped with a motor 68 and an electric push rod 69; wherein, the output end of the motor 68 is fixedly connected to the first valve stem 441.

[0034] Specifically, the support frame 67 is fixedly connected to the first valve 33, the motor 68 is fixedly installed on the support frame 67, and the electric push rod 69 is fixedly installed on the support frame 67, which serves as a support.

[0035] The locking member 7 includes a connecting seat 71 disposed on the outer surface of the switching seat 61. A first locking rod 72 and a second locking rod 73 are fixedly connected to the outer surface of the connecting seat 71. A first locking groove 74 is provided on the second transmission wheel 512, and a second locking groove 75 is provided on the fourth transmission wheel 522.

[0036] Specifically, the connecting seat 71 is rotatably connected to the switching seat 61, so that the connecting seat 71 does not rotate with the switching seat 61. The first locking rod 72 and the second locking rod 73 are both fixedly connected to the connecting seat 71. The first locking rod 72 is adapted to the first locking groove 74 and is inserted into the first locking groove 74. The second locking rod 73 is adapted to the second locking groove 75 and is inserted into the second locking groove 75. The telescopic end of the electric push rod 69 is fixedly connected to the connecting seat 71.

[0037] In use, in conjunction with Embodiment 2, when pre-evacuation of condenser 1 on side A or condenser 2 on side B is required, the electric push rod 69 is activated, causing the connecting seat 71 to move the switching seat 61 downwards, so that the first gear 62 gradually inserts into the first tooth groove 66 on the first transmission wheel 511. When the first gear 62 is fully inserted into the first slot, the first valve stem 441 and the second valve stem 451 form a linked engagement state. At this time, the motor 68 is started, and the first valve stem 441 rotates, realizing the opening of the second valve 44. At the same time, the rotation of the second valve stem 451 will drive... When the fixed rod 65 rotates, the first gear 62 and the switching seat 61 drive the first transmission wheel 511 to rotate synchronously under the action of the slide groove 64 and the fixed rod 65. The second transmission wheel 512 rotates synchronously with the first transmission wheel 511 under the action of the first transmission belt 513, causing the second valve stem 451 to rotate, thereby opening the third valve 45 and achieving the purpose of opening the second valve 44 and the third valve 45 synchronously. At this time, the gas in the A-side condenser 1 or the B-side condenser 2 is transported to the pre-evacuation vacuum pump 46 through the first pre-evacuation pipeline 41 and the second pre-evacuation pipeline 42. At the same time, when the switching seat 61 moves downward, the connecting seat 71 moves downward in sync with the switching seat 61, thereby driving the second locking rod 73 to move downward, so that the second locking rod 73 is inserted into the second locking groove 75, thereby locking the fourth transmission wheel 522 and preventing the third valve rod 461 from being accidentally touched. After the pressures of condenser 1 on side A and condenser 2 on side B are balanced, the second valve 44 and the third valve 45 are closed via motor 68, first valve stem 441, second valve stem 451, first transmission wheel 511, second transmission wheel 512, and first transmission belt 513. Then, the electric push rod 69 is activated, and the connecting seat 71 drives the switching seat 61 to move upward, causing the first gear 62 to insert into the first tooth groove 66 on the third transmission wheel 521, thus linking the first valve stem 441 and the third valve stem 451. At this time, motor 68 is activated, and the first valve stem 441 rotates, opening the second valve 44. Simultaneously, the second valve stem 451... When 51 rotates, it will drive the fixed rod 65 to rotate. The first gear 62 and the switching seat 61 drive the third transmission wheel 521 to rotate synchronously under the action of the slide groove 64 and the fixed rod 65. The fourth transmission wheel 522 rotates synchronously with the third transmission wheel 521 under the action of the second transmission belt 523, so that the third valve stem 461 rotates, realizing the opening of the fourth valve 47, achieving the purpose of synchronous opening of the second valve 44 and the third valve 45, and opening the fifth valve 48, so that the gas in the A-side condenser 1 or the B-side condenser 2 is transported to the vacuum pump through the first pre-extraction pipeline 41, the bypass pipeline 43, the first pipeline 31 and the second pipeline 32. At the same time, when the switching seat 61 moves downward, the connecting seat 71 moves upward in sync with the switching seat 61, thereby driving the first locking rod 72 to move upward, so that the first locking rod 72 is inserted into the first locking groove 74, thereby locking the second transmission wheel 512 and preventing the second valve rod 451 from being accidentally touched.

[0038] Example 5 Reference Figures 1 to 11 This embodiment differs from the fourth embodiment in that it also includes a manual component 8 disposed on the second valve stem 451 and the third valve stem 461. The manual component 8 includes a fixed seat 81 disposed on the second valve stem 451 and the third valve stem 461. Both the second valve stem 451 and the third valve stem 461 are provided with grooves 82. A manual lever 83 is disposed in the grooves 82. A second gear 84 is provided at the bottom of the manual lever 83. A second tooth groove 85 is provided on the bottom wall of the groove 82. A connecting block 86 is fixedly connected to the outer surface of the manual lever 83. A vertical groove 87 is provided in the fixed seat 81. A rotation groove 88 and a limiting groove 89 are provided in the vertical groove 87. The second gear 84 is meshed with the second tooth groove 85.

[0039] Specifically, the two fixed seats 81 are rotatably connected to the second valve stem 451 and the third valve stem 461 respectively, the manual rod 83 is slidably connected to the groove 82, the connecting block 86 is arranged in a cross shape, the connecting block 86 is fixedly connected to the manual rod 83, the vertical groove 87 is connected to the rotating groove 88 and the limiting groove 89, and the rotating groove 88 is connected to the groove 82.

[0040] In use, when the switching seat 61 is in its initial state, the first valve stem 441, the second valve stem 451, and the third valve stem 461 do not form a linkage and can be operated independently. When the manual lever 83 is in its initial state, the connecting block 86 is located in the limiting groove 89. At this time, the operator cannot rotate the second valve stem 451 or the third valve stem 461 by manually moving the lever 83. Rotating the manual lever 83 causes the connecting block 86 to rotate to the vertical groove 87. Pressing the manual lever 83 downwards causes the manual lever 83 to drive the connecting block 86 and the second gear 84 to move downwards, so that the connecting block 86 is located in the rotating groove 88 and the second gear 84 is inserted into the second tooth groove 85. At this time, rotating the manual lever 83, under the action of the second gear 84 and the second tooth groove 85, can drive the second valve stem 451 and the third valve stem 461 to rotate, realizing the independent operation of the second valve stem 451 and the third valve stem 461.

[0041] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A vacuum isolation system for a steam turbine condenser in a power plant, characterized in that: include, A-side condenser (1) and B-side condenser (2); Steam transmission component (3), which is installed on the A-side condenser (1) and the B-side condenser (2); The pre-extraction section (4) is located on the steam transmission component (3); When the A-side condenser (1) or the B-side condenser (2) is restored after maintenance, the pre-vacuum is pre-evacuated through the pre-evacuation section (4) to balance the pressure of the A-side condenser (1) and the B-side condenser (2).

2. The vacuum isolation system for a power plant turbine condenser according to claim 1, characterized in that: The steam transmission component (3) includes a first pipeline (31) provided on the A-side condenser (1) and the B-side condenser (2), a second pipeline (32) is provided on both first pipelines (31), and a first valve (33) is provided on both first pipelines (31). Among them, the two first pipelines (31) are fixedly connected to the A-side condenser (1) and the B-side condenser (2), respectively.

3. The vacuum isolation system for a power plant turbine condenser according to claim 2, characterized in that: The pre-extraction section (4) includes a first pre-extraction pipeline (41) provided on two first pipelines (31), a second pre-extraction pipeline (42) and a bypass pipeline (43) provided on the first pre-extraction pipeline (41), a second valve (44) provided on the first pre-extraction pipeline (41), a third valve (45) and a pre-extraction vacuum pump (46) provided on the second pre-extraction pipeline (42), and a fourth valve (47) and a fifth valve (48) provided on the bypass pipeline (43). The bypass pipe (43) is fixedly connected to the first bypass.

4. A vacuum isolation device for a steam turbine condenser in a power plant, characterized in that: Including the vacuum isolation system for the condenser of a power plant turbine as described in any one of claims 1 to 3, and, The first valve stem (441), the second valve stem (451), and the third valve stem (461) are respectively disposed on the second valve (44), the third valve (45), and the fourth valve (47); The linkage part (5) includes a first linkage member (51) disposed on the first valve stem (441) and the second valve stem (451), and a second linkage member (52) disposed on the first valve stem (441) and the third valve stem (461). The switching component (6) is located between the first linkage component (51) and the second linkage component (52); Locking element (7), which is provided on switching element (6); The switching member (6) enables the switching of the first linkage member (51) and the second linkage member (52), and the locking member (7) moves synchronously with the switching member (6).

5. The vacuum isolation device for a power plant turbine condenser according to claim 4, characterized in that: The first linkage (51) includes a first transmission wheel (511) disposed on the first valve stem (441), and a second transmission wheel (512) disposed on the second valve stem (451). The first transmission wheel (511) and the second transmission wheel (512) are connected together by a first transmission belt (513).

6. The vacuum isolation device for a power plant steam turbine condenser according to claim 5, characterized in that: The second linkage (52) includes a third transmission wheel (521) disposed on the first valve stem (441), a fourth transmission wheel (522) disposed on the third valve stem (461), and a second transmission belt (523) is connected to the third transmission wheel (521) and the fourth transmission wheel (522) for transmission. The third transmission wheel (521) is located directly above the first transmission wheel (511).

7. The vacuum isolation device for a power plant steam turbine condenser according to claim 6, characterized in that: The switching component (6) includes a switching seat (61) disposed on the first valve stem (441). The side wall of the switching seat (61) is provided with two first gears (62). Both the two first gears (62) and the side wall of the switching seat (61) are provided with through grooves (63). The through grooves (63) are provided with sliding grooves (64). The first valve stem (441) is provided with a fixing rod (65). The side walls of the first transmission wheel (511) and the third transmission wheel (521) are provided with first tooth grooves (66). The switching seat (61) is located between the first transmission wheel (511) and the third transmission wheel (521).

8. The vacuum isolation device for a power plant turbine condenser according to claim 7, characterized in that: The switching component (6) also includes a support frame (67) mounted on the first valve (33), and the support frame (67) is provided with a motor (68) and an electric push rod (69). The output end of the motor (68) is fixedly connected to the first valve stem (441).

9. The vacuum isolation device for a power plant steam turbine condenser according to claim 8, characterized in that: The locking member (7) includes a connecting seat (71) disposed on the outer surface of the switching seat (61). A first locking rod (72) and a second locking rod (73) are fixedly connected to the outer surface of the connecting seat (71). A first locking groove (74) is provided on the second transmission wheel (512), and a second locking groove (75) is provided on the fourth transmission wheel (522).

10. The vacuum isolation device for a power plant steam turbine condenser according to claim 9, characterized in that: It also includes a manual component (8) provided on the second valve stem (451) and the third valve stem (461). The manual component (8) includes a fixed seat (81) provided on the second valve stem (451) and the third valve stem (461). The second valve stem (451) and the third valve stem (461) are both provided with grooves (82). A manual rod (83) is provided in the groove (82). A second gear (84) is provided at the bottom of the manual rod (83). A second tooth groove (85) is provided on the bottom wall of the groove (82). A connecting block (86) is fixedly connected to the outer surface of the manual rod (83). A vertical groove (87) is provided in the fixed seat (81). A rotating groove (88) and a limiting groove (89) are provided in the vertical groove (87). The second gear (84) meshes with the second tooth groove (85).

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