Prevention and control device for accumulated water in inlet pipeline of sealing oil explosion-proof fan of generator

Abstract

The utility model discloses a prevention and control device for accumulated water in an inlet pipeline of a generator sealing oil explosion-proof fan, which comprises a hydrogen insulation device, an explosion-proof fan, a pipeline, a main oil tank and a smoke exhaust fan. The floating plate ascends to push the fixing plate to move, the fixing plate enables the closing plate to rotate through the connecting rod, the position of the connecting rod is fixed through the limiting block, the closing plate rotates to open the bottom of the drainage pipeline for drainage, accumulated water can be rapidly and automatically cleaned through the arrangement, and tedious manual operation is omitted; the size of the main oil tank smoke exhaust fan inlet channel is adjusted through the control device, the negative pressure in the main oil tank is reduced, so that the pressure difference between the steam pressure of a steam turbine shaft seal and the pressure in a bearing box is reduced, the water content of oil smoke in an air side sealing oil explosion-proof fan inlet pipeline is controlled, and water accumulation is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of steam turbine generator sealing oil system, specifically a prevention and control device for water accumulation in the inlet pipe of the generator sealing oil explosion-proof fan. Background Technology

[0002] The turbine generator sealing oil system is a device used to prevent external gases from entering the generator and to prevent hydrogen from leaking out of the generator. It is crucial for turbine generators that use hydrogen as a cooling medium.

[0003] To address the issue of water accumulation in the inlet pipe of the explosion-proof fan of the hydrogen barrier device on the air side during the operation of the turbine generator sealing oil system, the current common practice is to install a drain pipe and valve control system on the horizontal section of the explosion-proof fan inlet pipe. Operators perform water draining operations periodically, ranging from 1 to 4 times a day depending on the amount of water generated. This increases the workload of operators and cannot fundamentally prevent water accumulation in the explosion-proof fan inlet pipe. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a prevention and control device for water accumulation in the inlet pipe of the generator sealing oil explosion-proof fan, thus solving the aforementioned problems.

[0006] (0) Technical solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a prevention and control device for water accumulation in the inlet pipe of an explosion-proof fan for generator sealing oil, comprising a hydrogen isolation device, an explosion-proof fan, a pipe, a main oil tank, an exhaust fan, a drainage device, and a control device. The explosion-proof fan is located outside the hydrogen isolation device, the pipe is located at the right end of the explosion-proof fan, the main oil tank is located outside the hydrogen isolation device, the exhaust fan is located outside the main oil tank, and the drainage device is located at the bottom end of the pipe. The drainage device includes a drainage pipe, a fixing block, a guide rod, and a float plate. The system includes a push block, an adjusting block, and an opening / closing mechanism. The drainage pipe is located at the bottom end of the main pipe and is connected to the interior of the main pipe. The fixing block is fixed inside the drainage pipe. The guide rod is fixed outside the fixing block. The float is located outside the guide rod. The push block is fixed at the top of the float. The adjusting block is fixed at the right end of the push block. The opening / closing mechanism is located outside the drainage pipe and is used to control the opening and closing of the bottom end of the drainage pipe. The control device is located outside the exhaust fan and is used to control the size of the inlet door passage of the exhaust fan.

[0008] Preferably, the opening and closing mechanism includes a movable groove, a fixed plate, a round rod, a connecting rod, an adjusting rod, a sliding groove, a closing plate, a tension spring, a fixing mechanism, and a hinge. The movable groove is located on the outside of the drainage pipe. The fixed plate passes through the interior of the movable groove. The round rod passes through the interior of the fixed plate and is fixed inside the movable groove. The connecting rod is fixed to the bottom end of the fixed plate. The adjusting rod is fixed to the bottom outside of the connecting rod and is located inside the sliding groove. The sliding groove is located on the outside of the closing plate. The closing plate is located at the bottom end of the drainage pipe, and its top end is rotatably connected to the hinge. The hinge is fixed to the right end of the drainage pipe. One end of the tension spring is rotatably connected to the outside of the drainage pipe via a rotating shaft, and the other end of the tension spring is rotatably connected to the outside of the closing plate via a rotating shaft. The fixing mechanism is located inside the drainage pipe.

[0009] Preferably, the fixing mechanism includes a fixing groove, a limiting block, a slot, a limiting rod, and a spring. The fixing groove is disposed inside the drainage pipe, the limiting block passes through the interior of the fixing groove, the slot is opened at the left end of the connecting rod, the limiting rod passes through the interior of the fixing groove, and the right end of the limiting rod is fixedly connected to the limiting block. The spring is fitted on the outside of the limiting rod.

[0010] Preferably, the control device includes a protective shell, a bidirectional screw, a motor, a guide rod, and a movable block. The protective shell is fixed to the outside of the exhaust fan. One end of the bidirectional screw is connected to the output shaft of the motor via a coupling, and the other end of the bidirectional screw is rotatably connected to the inside of the protective shell via a support base. The motor is installed at the left end of the protective shell, the guide rod is fixed inside the protective shell, and the movable block is located on the outside of the bidirectional screw and the guide rod.

[0011] Preferably, the left end face of the push block is inclined and tilted upward from left to right. This arrangement enables the limit rod to move when the push block moves downward.

[0012] Preferably, the inner wall of the groove is smooth and slidably connected to the outer side of the adjusting rod, which makes the adjustment rod move more smoothly.

[0013] Preferably, the right end face of the limiting block is inclined and tilted downward from left to right. This arrangement allows the limiting block to quickly enter the interior of the slot when the inclined surface of the limiting block contacts the inner wall of the slot.

[0014] (III) Beneficial Effects

[0015] This utility model provides a prevention and control device for water accumulation in the inlet pipe of the generator sealing oil explosion-proof fan. It has the following beneficial effects: By setting up a drainage device and a control device, when the water accumulation in the pipe reaches a certain amount, the drainage device can automatically clear the water. The accumulated water pushes a float plate upward, which in turn pushes a fixed plate to move. The fixed plate, through a connecting rod, causes a closed plate to rotate. A limit block fixes the position of the connecting rod. The rotation of the closed plate opens the bottom of the drainage pipe for drainage. This design allows for quick and automatic water clearing, eliminating the tediousness of manual operation. The control device adjusts the size of the main oil tank exhaust fan inlet channel, reducing the negative pressure in the main oil tank. This reduces the pressure difference between the turbine shaft seal steam pressure and the bearing housing pressure, thereby reducing the probability of turbine shaft seal leakage into the bearing housing. This effectively controls the moisture content of the oil fume in the inlet pipe of the air-side sealing oil explosion-proof fan, greatly reducing water accumulation. Attached Figure Description

[0016] Figure 1 This is a flow chart of the generator sealing oil return process according to this utility model;

[0017] Figure 2 This is a flowchart illustrating the oil fume emission process of the main oil tank of a steam turbine according to this utility model.

[0018] Figure 3 This is a front view of the explosion-proof fan structure in this utility model;

[0019] Figure 4 This is a front view of the drainage device structure in this utility model;

[0020] Figure 5 This is a front view of the opening and closing mechanism structure in this utility model;

[0021] Figure 6 This is a front view of the fixing mechanism structure in this utility model;

[0022] Figure 7 This is a front view of the control device structure in this utility model;

[0023] Figure 8 This is a top view of the control device structure in this utility model.

[0024] In the diagram: Hydrogen isolation device-1, explosion-proof fan-2, pipeline-3, main oil tank-4, exhaust fan-5, drainage device-6, control device-7, drainage pipeline-61, fixing block-62, guide rod-63, float plate-64, push block-65, adjusting block-66, opening and closing mechanism-67, movable groove-671, fixing plate-672, round rod-673, connecting rod-674, adjusting rod-675, sliding groove-676, closing plate-677, tension spring-678, fixing mechanism-679, hinge-6710, fixing groove-6791, limit block-6792, slot-6793, limit rod-6794, spring-6795, protective shell-71, double screw-72, motor-73, smooth rod-74, movable block-75. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1-6This utility model provides a technical solution for a prevention and control device for water accumulation in the inlet pipe of an explosion-proof fan for generator sealing oil: The prevention and control device for water accumulation in the inlet pipe of an explosion-proof fan for generator sealing oil includes a hydrogen isolation device 1, an explosion-proof fan 2, a pipe 3, a main oil tank 4, an exhaust fan 5, a drainage device 6, and a control device 7. The explosion-proof fan 2 is located outside the hydrogen isolation device 1, the pipe 3 is located at the right end of the explosion-proof fan 2, the main oil tank 4 is located outside the hydrogen isolation device 1, the exhaust fan 5 is located outside the main oil tank 4, and the drainage device 6 is located at the bottom end of the pipe 3. The drainage device 6 includes a drainage pipe 61, a fixing block 62, a guide rod 63, a float 64, a push block 65, an adjusting block 66, and an opening and closing mechanism 67. The drainage pipe 61 is located at the bottom end of the pipe 3. It is connected to the inside of pipe 3. The fixing block 62 is fixed inside the drainage pipe 61. The guide rod 63 is fixed outside the fixing block 62. The float plate 64 is set outside the guide rod 63. The push block 65 is fixed to the top of the float plate 64. The adjusting block 66 is fixed to the right end of the push block 65. The opening and closing mechanism 67 is set outside the drainage pipe 61. The opening and closing mechanism 67 is used to control the opening and closing of the bottom end of the drainage pipe 61. The control device 7 is set outside the smoke exhaust fan 5. The control device 7 is used to control the size of the inlet door passage of the smoke exhaust fan 5. The opening and closing mechanism 67 includes a movable groove 671, a fixing plate 672, a round rod 673, a connecting rod 674, an adjusting rod 675, a sliding groove 676, a closing plate 677, a tension spring 678, a fixing mechanism 679, and a hinge. The connector 6710 has a movable groove 671 located on the outside of the drain pipe 61. A fixed plate 672 extends through the interior of the movable groove 671. A round rod 673 extends through the interior of the fixed plate 672 and is fixed inside the movable groove 671. A connecting rod 674 is fixed to the bottom end of the fixed plate 672. An adjusting rod 675 is fixed to the bottom outside of the connecting rod 674, and the outer side of the adjusting rod 675 is located inside the sliding groove 676. The sliding groove 676 is located on the outer side of the closing plate 677. The closing plate 677 is located at the bottom end of the drain pipe 61, and the top end of the closing plate 677 is rotatably connected to the hinge 6710. The hinge 6710 is fixed to the right end of the drain pipe 61. One end of the tension spring 678 rotates with the outside of the drain pipe 61 via a pivot. The connection is made so that the other end of the tension spring 678 is rotatably connected to the outside of the closing plate 677 via a rotating shaft. The fixing mechanism 679 is located inside the drainage pipe 61. The fixing mechanism 679 includes a fixing groove 6791, a limiting block 6792, a slot 6793, a limiting rod 6794, and a spring 6795. The fixing groove 6791 is located inside the drainage pipe 61. The limiting block 6792 passes through the interior of the fixing groove 6791. The slot 6793 is located at the left end of the connecting rod 674. The limiting rod 6794 passes through the interior of the fixing groove 6791, and the right end of the limiting rod 6794 is fixedly connected to the limiting block 6792. The spring 6795 is fitted onto the outside of the limiting rod 6794. The left end face of the push block 65 is inclined and tilts upward from left to right.This design allows the push block 65 to move downwards, thereby moving the limiting rod 6794. The inner wall of the slide groove 676 is smooth and slidably connected to the outer side of the adjusting rod 675, making the movement of the adjusting rod 675 smoother. The right end face of the limiting block 6792 is inclined downwards from left to right. This design allows the limiting block 6792 to quickly enter the slot 6793 when its inclined surface contacts the inner wall of the slot 6793.

[0027] The limiting rod 6794 has a through hole on its outer side, so that when the adjusting block 66 moves downward, it can move the limiting rod 6794 by engaging with the through hole. A set of magnets is provided in the inner wall of the bottom end of the drainage pipe 61, and a set of magnets is provided on the top left side of the closing plate 677. The two sets of magnets attract each other. At the same time, a counterweight is provided on the right end of the closing plate 677 to ensure that the closing plate 677 can close the bottom of the drainage pipe.

[0028] After passing through the differential pressure valve, the air-side sealing oil enters the air-side oil inlet of the generator sealing tile to form an oil ring that seals the generator shaft end. The discharged oil enters the bearing lubricating oil return pipeline and flows into the hydrogen isolation device. In addition, the generator bearing lubricating oil return also returns to the hydrogen isolation device 1. The hydrogen isolation device 1 is equipped with two explosion-proof fans 2, usually one is running and the other is on standby. They are switched periodically to extract and remove the small amount of hydrogen gas and other impurities, water, etc. that are released from the oil. At the same time, the hydrogen isolation device 1 is kept in a slightly negative pressure state to facilitate smooth oil return. The air-side sealing oil comes from the turbine main oil tank 4. After being pressurized by the air-side sealing oil pump, it enters the generator sealing tile. The return oil passes through the hydrogen isolation device 1 to remove impurities and then returns to the turbine main oil tank 4. This forms a sealing oil circulation system.

[0029] The main oil tank 4 of the turbine adopts a containerized approach to concentrate the AC lubricating oil pump, DC emergency oil pump, #1 oil ejector, #2 oil ejector, check valve, etc. in the oil system. It is arranged in the oil tank for easy operation and monitoring. Two exhaust fans are installed on the main oil tank 4 and mounted on the main oil tank cover. They are mainly used to separate the oil and smoke mixture in the lubricating oil, extract and remove the flue gas, impurities, and moisture that are separated from the lubricating oil, and return the oil droplets to the oil tank to reduce environmental pollution. At the same time, it creates a slightly negative pressure state in the main oil tank 4 and the oil return system of each bearing box to ensure smooth oil return from the bearing isolation bearing. During the operation of the unit, one of the two exhaust fans 5 is running and the other is on standby, and they are switched periodically.

[0030] Explosion-proof fan 2: Used in systems that are prone to generating explosive gas mixtures to extract and discharge gases that pose an explosion hazard, thereby preventing the risk of system explosion;

[0031] Hydrogen separation device 1: A container-type device used to separate oil from hydrogen and other impurity gases;

[0032] Steam turbine: A rotary steam power unit in which high-temperature and high-pressure steam passes through a fixed nozzle and becomes an accelerated airflow that is then injected onto the blades, causing the rotor equipped with a row of blades to rotate and perform work. Steam turbine is a major piece of equipment in modern thermal power plants.

[0033] Steam turbine shaft seal: A steam sealing device installed to prevent steam leakage between the steam turbine shaft and the cylinder;

[0034] Generator sealing oil: A medium used in liquid sealing devices to prevent leakage of cooling gas along the axial clearance inside an air-cooled generator, serving both sealing and lubrication functions.

[0035] Please see Figure 7 and Figure 8 This utility model provides a technical solution for a prevention and control device for water accumulation in the inlet pipe of an explosion-proof fan for generator sealing oil: The prevention and control device for water accumulation in the inlet pipe of an explosion-proof fan for generator sealing oil includes a protective shell 71, a bidirectional screw 72, a motor 73, a smooth rod 74, and a movable block 75. The protective shell 71 is fixed to the outside of the exhaust fan 5. One end of the bidirectional screw 72 is connected to the output shaft of the motor 73 via a coupling, and the other end of the bidirectional screw 72 is rotatably connected to the inside of the protective shell 71 via a support seat. The motor 73 is installed on the left end of the protective shell 71. The smooth rod 74 is fixed inside the protective shell 71. The movable block 75 is located on the outside of the bidirectional screw 72 and the outside of the smooth rod 74.

[0036] The movable block 75 is provided in two sets, both of which are located on the outside of the bidirectional screw 72 and the outside of the smooth rod 74. The outer side of the movable block 75 is provided with two sets of notches, one of which has a threaded inner wall and is threadedly connected to the bidirectional screw 72, while the other set of notches has a smooth inner wall and is slidably connected to the smooth rod 74.

[0037] The top of the main oil tank 4 is equipped with a negative pressure sensor, which is a MIK-P310 sensor that can accurately detect the negative pressure in the main oil tank.

[0038] The working principle is as follows:

[0039] First, during use, the negative pressure of the main oil tank is monitored in real time by the negative pressure sensor in the main oil tank. When the data is abnormal, the motor 73 is started. The motor 73 drives the bidirectional screw 72 to rotate. When the bidirectional screw 72 rotates, it drives the movable block 75 to move. When the movable block 75 moves, it adjusts the size of the inlet door of the exhaust fan 5 to reduce the negative pressure in the main oil tank, thereby reducing the leakage of steam from the turbine shaft seal into the bearing box, and thus controlling the moisture content of the oil fume in the inlet pipe of the air-side sealing oil explosion-proof fan 2.

[0040] Secondly, the water in the inlet pipe 3 of the explosion-proof fan 2 flows into the drainage pipe 61 for temporary storage. As the water continuously enters, the float 64 floats upward and moves along the guide rod 63. When the float 64 moves, it drives the push block 65 to move. When the accumulated water reaches a certain amount, the float 64 drives the push block 65 to push the fixed plate 672 to move.

[0041] Third, the fixing plate 672 moves upward along the round rod 673. When the fixing plate 672 moves, it drives the connecting rod 674 to move. When the connecting rod 674 moves, it drives the slot 6793 to move. When the slot 6793 contacts the inclined surface of the limiting block 6792, the spring 6795 loses its force and releases elastic potential energy to push the limiting block 6792 to move. When the limiting block 6792 moves, it moves quickly into the slot 6793, thereby quickly pushing the connecting rod 674 to move upward, so that the limiting block 6792 is embedded in the slot 6793.

[0042] Fourth, when the connecting rod 674 moves upward, it drives the adjusting rod 675 to move. When the adjusting rod 675 moves, it drives the closing plate 677 to rotate around the hinge 6710. When the closing plate 677 rotates, it pulls the tension spring 678. When the closing plate 677 rotates, it can cancel the sealing effect on the bottom of the drainage pipe 61, allowing the accumulated water to drain out.

[0043] Fifth, as the water level drops, the float 64 moves accordingly. When the float 64 moves, it drives the adjusting block 66 to move. When the adjusting block 66 moves, it extends into the inside of the limiting rod 6794 and continues to move, thereby pushing the limiting rod 6794 to move. The movement of the limiting rod 6794 drives the limiting block 6792 to move, causing the limiting block 6792 to move out of the slot 6793. Then, after the tension spring 678 loses its force, it releases elastic potential energy to pull the closing plate 677 to rotate. With the cooperation of the counterweight block at the right end of the closing plate 677, the closing plate 677 re-closes the drainage pipe 61, completing the drainage.

[0044] The control method of this utility model is to control the device by manually starting and stopping the switch. The wiring diagram of the power element and the supply of power are common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

[0045] The control method of this utility model is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the field. Since this utility model is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for preventing and controlling water accumulation in the inlet pipe of a generator sealing oil explosion-proof fan, characterized in that: The device includes a hydrogen isolation device (1), an explosion-proof fan (2), a pipeline (3), a main oil tank (4), an exhaust fan (5), a drainage device (6), and a control device (7). The explosion-proof fan (2) is located outside the hydrogen isolation device (1), the pipeline (3) is located at the right end of the explosion-proof fan (2), the main oil tank (4) is located outside the hydrogen isolation device (1), the exhaust fan (5) is located outside the main oil tank (4), and the drainage device (6) is located at the bottom end of the pipeline (3). The drainage device (6) includes a drainage pipeline (61), a fixing block (62), a guide rod (63), and a float. (64), push block (65), adjusting block (66) and opening and closing mechanism (67), the drainage pipe (61) is located at the bottom end of the pipe (3) and is connected to the inside of the pipe (3), the fixing block (62) is fixed inside the drainage pipe (61), the guide rod (63) is fixed outside the fixing block (62), the float plate (64) is located outside the guide rod (63), the push block (65) is fixed at the top of the float plate (64), the adjusting block (66) is fixed at the right end of the push block (65), and the opening and closing mechanism (67) is located outside the drainage pipe (61); The opening and closing mechanism (67) is used to control the opening and closing of the bottom end of the drainage pipe (61). The control device (7) is located on the outside of the smoke exhaust fan (5). The control device (7) is used to control the size of the entrance door passage of the smoke exhaust fan (5).

2. The device for preventing and controlling water accumulation in the inlet pipe of the generator sealing oil explosion-proof fan according to claim 1, characterized in that: The opening and closing mechanism (67) includes a movable groove (671), a fixed plate (672), a round rod (673), a connecting rod (674), an adjusting rod (675), a sliding groove (676), a closing plate (677), a tension spring (678), a fixing mechanism (679), and a hinge (6710). The movable groove (671) is located on the outside of the drainage pipe (61). The fixed plate (672) penetrates the interior of the movable groove (671). The round rod (673) penetrates the interior of the fixed plate (672) and is fixed inside the movable groove (671). The connecting rod (674) is fixed to the bottom end of the fixed plate (672). The adjusting rod (675) is fixed to the bottom end of the fixed plate (672). The outer bottom of the connecting rod (674) and the outer side of the adjusting rod (675) are located inside the slide groove (676). The slide groove (676) is opened on the outer side of the closing plate (677). The closing plate (677) is located at the bottom end of the drain pipe (61). The top end of the closing plate (677) is rotatably connected to the hinge (6710). The hinge (6710) is fixed to the right end of the drain pipe (61). One end of the tension spring (678) is rotatably connected to the outer side of the drain pipe (61) through a rotating shaft. The other end of the tension spring (678) is rotatably connected to the outer side of the closing plate (677) through a rotating shaft. The fixing mechanism (679) is located inside the drain pipe (61).

3. The device for preventing and controlling water accumulation in the inlet pipe of the generator sealing oil explosion-proof fan according to claim 2, characterized in that: The fixing mechanism (679) includes a fixing groove (6791), a limiting block (6792), a slot (6793), a limiting rod (6794), and a spring (6795). The fixing groove (6791) is located inside the drainage pipe (61). The limiting block (6792) passes through the interior of the fixing groove (6791). The slot (6793) is located at the left end of the connecting rod (674). The limiting rod (6794) passes through the interior of the fixing groove (6791), and the right end of the limiting rod (6794) is fixedly connected to the limiting block (6792). The spring (6795) is fitted on the outside of the limiting rod (6794).

4. The device for preventing and controlling water accumulation in the inlet pipe of the generator sealing oil explosion-proof fan according to claim 1, characterized in that: The control device (7) includes a protective shell (71), a bidirectional screw (72), a motor (73), a guide rod (74), and a movable block (75). The protective shell (71) is fixed to the outside of the exhaust fan (5). One end of the bidirectional screw (72) is connected to the output shaft of the motor (73) via a coupling, and the other end of the bidirectional screw (72) is rotatably connected to the inside of the protective shell (71) via a support seat. The motor (73) is installed on the left end of the protective shell (71). The guide rod (74) is fixed inside the protective shell (71). The movable block (75) is located on the outside of the bidirectional screw (72) and the outside of the guide rod (74).

5. The device for preventing and controlling water accumulation in the inlet pipe of the generator sealing oil explosion-proof fan according to claim 1, characterized in that: The left end face of the pusher (65) is inclined and tilts upward from left to right.

6. The device for preventing and controlling water accumulation in the inlet pipe of the generator sealing oil explosion-proof fan according to claim 2, characterized in that: The inner wall of the groove (676) is smooth and is slidably connected to the outer side of the adjusting rod (675).

7. The device for preventing and controlling water accumulation in the inlet pipe of the generator sealing oil explosion-proof fan according to claim 3, characterized in that: The right end face of the limiting block (6792) is inclined and tilts downward from left to right.

Images