Water-turbine generator set main shaft sealing state monitoring system

Abstract

The utility model discloses a water-turbine generator set main shaft sealing state monitoring system which comprises a first pressure sensor and a second pressure sensor, a floating assembly of a water-turbine generator set is provided with a plurality of pressure measuring holes, the pressure measuring holes vertically penetrate through the floating assembly, and the lower ends of the pressure measuring holes are communicated with a water purification ring cavity located at the bottom of the floating assembly. The first pressure sensor is mounted at the upper end of the pressure measuring hole; the second pressure sensor is used for measuring the water pressure in the muddy water cavity of the water-turbine generator set. The multiple pressure measuring holes are formed in the floating assembly of the water-turbine generator set, the lower ends of the pressure measuring holes are communicated with the water purification ring cavity, and the pressure sensors are installed at the upper ends of the pressure measuring holes, so that the water pressure in the water purification ring cavity can be measured more accurately, and the sealing state of the main shaft of the water-turbine generator set is monitored.

Description

Technical Field

[0001] This utility model relates to the field of monitoring the sealing status of the main shaft of a hydro-generator set, and in particular to a monitoring system for the sealing status of the main shaft of a hydro-generator set. Background Technology

[0002] The main shaft seal of a hydro-generator unit is a core component of the turbine. As a water-sealing device between the turbine's main shaft and the top cover, its function is to prevent river water from overflowing from the runner chamber through the gap between the main shaft and the top cover during power generation and shutdown, thus preventing the water guide bearings and the top cover from being flooded. Currently, large hydro-turbines often employ a hydraulically balanced pressure self-compensating end-face seal structure. This structure creates a pressure difference between the clean water chamber and the turbid water chamber of the main shaft seal by introducing pressurized clean water, preventing water from the turbid water chamber from entering the unit. The traditional method for measuring the water pressure in the clean water annular chamber is to install a pressure gauge on the main clean water supply pipeline outside the water turbine room, and use the pressure gauge reading as an indicator of the water pressure in the clean water annular chamber.

[0003] Traditional methods for measuring water pressure in a water purification ring have the following drawbacks:

[0004] 1. Traditional pressure measuring points are usually only one, and are located on the main water supply pipe. Too few measuring points cannot accurately reflect the water pressure distribution in the main shaft seal cavity during actual operation of the unit.

[0005] 2. The traditional pressure measurement position is a certain distance from the water purification chamber. The water flow is affected by factors such as the flow resistance of the water supply pipeline, pipeline bends, the rotation disturbance of the impeller, and valves. There will inevitably be a certain deviation between the pressure gauge measurement value and the actual water pressure value in the water purification chamber. Moreover, this deviation is difficult to calculate accurately through theoretical analysis. Therefore, it is not accurate to use the pressure gauge measurement result to measure the water pressure in the water purification chamber. Utility Model Content

[0006] The purpose of this utility model is to provide a monitoring system for the sealing status of the main shaft of a hydro-generator set. By setting multiple pressure measuring holes on the floating component of the hydro-generator set, the lower end of the pressure measuring hole is connected to the clean water ring cavity, and a pressure sensor is installed on the upper end of the pressure measuring hole, so as to more accurately measure the water pressure in the clean water ring cavity and thus monitor the sealing status of the main shaft of the hydro-generator set.

[0007] To achieve the above objectives, this utility model provides a main shaft sealing status monitoring system for a hydro-generator set, including a first pressure sensor and a second pressure sensor. Multiple pressure measuring holes are provided on the floating assembly of the hydro-generator set, with the pressure measuring holes penetrating the floating assembly vertically. The lower end of the pressure measuring hole is connected to a clean water annular cavity located at the bottom of the floating assembly. The first pressure sensor is installed at the upper end of the pressure measuring hole. The second pressure sensor is used to measure the water pressure in the turbid water cavity of the hydro-generator set.

[0008] The fixed frame of the hydro-generator set is provided with a through hole, which is connected to the turbid water chamber, and the second pressure sensor is installed at the upper end of the through hole.

[0009] The floating assembly includes a floating ring and a sealing ring. The sealing ring is fixedly installed at the bottom of the floating ring, and the purified water ring cavity is located at the bottom of the sealing ring. The pressure measuring hole is located on the floating ring and the sealing ring.

[0010] The pressure measuring hole includes a first connecting hole, a second connecting hole, and a third connecting hole located inside the floating ring, and a fourth connecting hole located inside the sealing ring. The first connecting hole, the second connecting hole, the third connecting hole, and the fourth connecting hole are connected in sequence, and the fourth connecting hole is connected to the water purification ring cavity. The first pressure sensor is installed at the upper end of the first connecting hole.

[0011] A three-way ball valve is installed at the upper end of the pressure measuring hole, and the first pressure sensor is installed on one of the ports of the three-way ball valve.

[0012] It also includes a displacement detection mechanism, which is used to measure the upward displacement of the floating component.

[0013] The displacement detection mechanism includes a displacement sensor, which is mounted on a fixed frame via a bracket. The displacement sensor is a contact type, and its measuring end contacts the floating component to measure the upward displacement of the floating component.

[0014] The displacement detection mechanism includes a first ear seat, a second ear seat, a lever, and a displacement sensor. The first ear seat is fixedly installed on the top of the floating assembly, the second ear seat is fixedly installed on the fixed frame, and the displacement sensor is installed on the fixed frame by a bracket. The displacement sensor is located on the side away from the floating assembly. The displacement sensor is a contact type displacement sensor. One end of the lever is hinged to the first ear seat, and the other end is hinged to the measuring end of the displacement sensor. The middle part of the lever is hinged to the second ear seat, and the distance between the second ear seat and the displacement sensor is at least twice the distance between the first ear seat and the second ear seat.

[0015] The lever is provided with a first elongated hole at the end that is hinged to the first ear seat.

[0016] The lever is hinged to the displacement sensor at one end and has a longitudinal slot. The lever has a second elongated hole that extends laterally through the slot. The measuring end of the displacement sensor is fixedly mounted with a connecting seat. The connecting seat has protruding rods on both sides. The connecting seat is located inside the slot and the rods on both sides of the connecting seat pass through the second elongated holes on both sides.

[0017] Compared with the prior art, this utility model has the following technical effects:

[0018] 1. This utility model provides multiple pressure measuring holes on the floating component of the hydro-generator set. The lower end of the pressure measuring hole is connected to the clean water ring cavity, and a pressure sensor is installed on the upper end of the pressure measuring hole. This allows for more accurate measurement of the water pressure in the clean water ring cavity, thereby monitoring the sealing status of the main shaft of the hydro-generator set.

[0019] 2. This utility model also includes a displacement detection mechanism, which measures the upward displacement of the floating component to facilitate the determination that the pressure detected by the first pressure sensor is the pressure when the floating component floats. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model, which measures pressure using a first pressure sensor and a second pressure sensor.

[0022] Figure 2 This is a schematic diagram of the structure of the present invention, which measures the floating displacement of a floating component using a displacement detection mechanism.

[0023] Figure 3 This is a schematic diagram of the front view of the displacement detection mechanism in this utility model.

[0024] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure of AA.

[0025] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure of BB.

[0026] Figure 6 This is a schematic diagram of the structure of the bracket on which the displacement sensor is installed in this utility model.

[0027] Figure label:

[0028] 1. Main spindle; 2. Fixed frame; 3. Turbid water chamber; 4. Through hole;

[0029] Wear-resistant ring 10;

[0030] Floating ring 20;

[0031] Sealing ring 30, clean water ring cavity 31;

[0032] Pressure testing hole 40, first connecting hole 41, second connecting hole 42, plug 43, third connecting hole 44, fourth connecting hole 45;

[0033] First pressure sensor 50;

[0034] Three-way ball valve 60, port 61;

[0035] The displacement detection mechanism includes: a first lug 71, a first elongated hole 711, a second elongated hole 712, a pin 713, a second lug 72, a lever 73, a bracket 74, a fixed half-ring 741, a movable half-ring 742, a displacement sensor 75, a measuring end 751, a connecting seat 76, and a rod 761.

[0036] Second pressure sensor 80. Detailed Implementation

[0037] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0038] Example 1:

[0039] See Figure 1 Currently, a wear-resistant ring 10 is installed on the main shaft 1 of the hydro-generator unit. The wear-resistant ring 10 rotates with the main shaft 1. The sealing ring 30 is fixedly installed at the bottom of the floating ring 20. The clean water ring cavity 31 is located at the bottom of the sealing ring 30. After pressurized water is introduced into the clean water ring cavity 31, the floating ring 20 and the sealing ring 30 float up, so that a water film is formed between the sealing ring 30 and the wear-resistant ring 10.

[0040] See also Figure 1 The embodiment proposes a main shaft sealing status monitoring system for a hydro-generator set, including a first pressure sensor 50 and a second pressure sensor 80. Multiple pressure measuring holes 40 are provided on the floating assembly of the hydro-generator set. The pressure measuring holes 40 penetrate the floating assembly vertically, and the lower end of the pressure measuring holes 40 is connected to the clean water annular cavity 31 located at the bottom of the floating assembly. The first pressure sensor 50 is installed at the upper end of the pressure measuring hole 40. The second pressure sensor 80 is used to measure the water pressure in the turbid water cavity 3 of the hydro-generator set.

[0041] By setting multiple pressure measuring holes on the floating components of the hydro-generator set, with the lower end of the pressure measuring holes connected to the clean water annular cavity and the upper end of the pressure measuring holes installed with pressure sensors, the water pressure in the clean water annular cavity can be measured more accurately, thereby monitoring the status of the main shaft seal of the hydro-generator set.

[0042] Specifically, multiple pressure measuring holes 40 are arranged around the floating assembly. The water pressure measured by the first pressure sensor 50 is greater than the water pressure measured by the second pressure sensor 80, so as to ensure that the main shaft seal seals and isolates the muddy water or river water, thus ensuring the safe operation of the hydro-generator unit.

[0043] In this embodiment, a through hole 4 is provided on the fixed frame 2 of the hydro-generator set. The through hole 4 is connected to the muddy water chamber 3, and the second pressure sensor 80 is installed at the upper end of the through hole 4.

[0044] Specifically, both the first pressure sensor 50 and the second pressure sensor 80 are fiber optic pressure sensors. The two fiber optic pressure sensors are respectively threaded and sealed to the upper end of the pressure measuring hole 40 and the upper end of the through hole 4.

[0045] In this embodiment, the floating component includes a floating ring 20 and a sealing ring 30. The sealing ring 30 is fixedly installed at the bottom of the floating ring 20, the water purification ring cavity 31 is disposed at the bottom of the sealing ring 30, and the pressure measuring hole 40 is disposed on the floating ring 20 and the sealing ring 30.

[0046] Specifically, the pressure measuring hole 40 includes a first connecting hole 41, a second connecting hole 42, and a third connecting hole 44 located within the floating ring 20, and a fourth connecting hole 45 located within the sealing ring 30. The first connecting hole 41, the second connecting hole 42, the third connecting hole 44, and the fourth connecting hole 45 are connected in sequence, and the fourth connecting hole 45 is connected to the water purification ring cavity 31. The first pressure sensor 50 is installed at the upper end of the first connecting hole 41.

[0047] The first connecting hole 41 is a longitudinal hole, the second connecting hole 42 is a transverse hole, and the third connecting hole 44 is a longitudinal hole. One end of the second connecting hole 42 is connected to the lower end of the first connecting hole 41, and the other end is sealed by the plug 43. The third connecting hole 44 is aligned with the fourth connecting hole 45 on the sealing ring 30.

[0048] Furthermore, in order to expel the air from the pressure measuring port 40, a three-way ball valve 60 is installed at the upper end of the pressure measuring port 40, and the first pressure sensor 50 is installed on one of the ports 61 of the three-way ball valve 60.

[0049] When purging air, after the first pressure sensor 50 is installed, pressurized water is introduced into the clean water ring cavity 31. At this time, the empty port 61 of the three-way ball valve 60 is opened first. At this time, the air in the pressure measuring hole 40 is discharged. After the water is discharged from the empty port 61, the three-way ball valve 60 is adjusted to connect the pressure measuring hole 40 with the first pressure sensor 50, and the empty port 61 is closed.

[0050] Example 2:

[0051] Based on Embodiment 1, this utility model also includes a displacement detection mechanism 70, which measures the upward displacement of the floating component to facilitate the determination that the pressure detected by the first pressure sensor 50 is the pressure when the floating component floats.

[0052] In this embodiment, the displacement detection mechanism 70 includes a displacement sensor 75, which is mounted on the fixed frame 2 via a bracket 74. The displacement sensor 75 is a contact type displacement sensor, and the measuring end 751 of the displacement sensor 75 is in contact with the floating component to measure the upward displacement of the floating component.

[0053] Combination Figure 2 , 6 In this embodiment, the displacement sensor 75 is mounted longitudinally, and the measuring end 751 of the displacement sensor 75 abuts against the top of the floating ring 20, so that it can be detected by the displacement sensor 75 when the floating component floats.

[0054] Example 3:

[0055] The difference from Embodiment 2 is that, since the displacement of the floating component is small and not convenient to measure directly, in this embodiment, see... Figures 2 to 6 The displacement detection mechanism 70 includes a first ear seat 71, a second ear seat 72, a lever 73, and a displacement sensor 75. The first ear seat 71 is fixedly mounted on the top of the floating assembly, the second ear seat 72 is fixedly mounted on the fixed frame 2, and the displacement sensor 75 is mounted on the fixed frame 2 via a bracket 74, with the displacement sensor 75 located away from the floating assembly. The displacement sensor 75 is a contact type displacement sensor. One end of the lever 73 is hinged to the first ear seat 71, and the other end is hinged to the measuring end 751 of the displacement sensor 75. The middle of the lever 73 is hinged to the second ear seat 72, and the distance between the second ear seat 72 and the displacement sensor 75 is at least twice the distance between the first ear seat 71 and the second ear seat 72. This structure amplifies the upward displacement of the floating assembly. When the lever 73 moves upward by a small distance at one end of the first ear seat 71, this displacement is facilitated by the lever 73 and measured by the displacement sensor 75.

[0056] In the preferred embodiment, see Figure 2 The distance between the second ear seat 72 and the displacement sensor 75 is L2, and the distance between the first ear seat 71 and the second ear seat 72 is L1. The length of L2 is 5 to 10 times the length of L1.

[0057] Specifically, see Figures 3 to 5Both the first ear seat 71 and the second ear seat 72 are double-eared ear seats, and are hinged to the lever 73 via pins 713. The end of the lever 73 hinged to the first ear seat 71 has a first elongated hole 711, through which the pin 713 passes. The end of the lever 73 hinged to the displacement sensor 75 has a longitudinal slot, and a second elongated hole 712 extending laterally through the slot. A connecting seat 76 is fixedly mounted on the measuring end 751 of the displacement sensor 75. Extending rods 761 are provided on both sides of the connecting seat 76, which is located within the slot. The rods 761 on both sides of the connecting seat 76 pass through the second elongated holes 712 on both sides. This structure allows the lever 73 to swing flexibly.

[0058] In Example 2 or Example 3, the displacement sensor 75 adopts an underwater high-pressure LVDT displacement sensor from Beijing Abek Sensor Technology Co., Ltd.

[0059] In this embodiment, see Figure 6 A fixed half-ring 741 is welded onto the bracket 74, and a movable half-ring 742 is mounted on the fixed half-ring 741 by screws. The lower end of the displacement sensor 75 passes through the bracket 74 and is fixed between the fixed half-ring 741 and the movable half-ring 742.

[0060] The method of use or principle of this utility model:

[0061] During operation, the water pressure in the clean water annular cavity 31 is measured by the first pressure sensor 50, and the water pressure in the turbid water cavity 3 of the turbine generator set is measured by the second pressure sensor 80. The water pressure measured by each of the first pressure sensors 50 must be greater than the water pressure measured by the second pressure sensor 80 to ensure the main shaft seal effectively seals and isolates the turbid water or river water, thus guaranteeing the safe operation of the turbine generator set.

[0062] In addition to ensuring that the water pressure measured by the first pressure sensor 50 is greater than the water pressure measured by the second pressure sensor 80, it is also necessary to further confirm that the floating component is in an upward state. Therefore, the upward displacement of the floating component is measured by the displacement detection mechanism 70, which facilitates the determination that the pressure detected by the first pressure sensor 50 is the pressure when the floating component is in an upward state, thereby further ensuring the safe operation of the hydro-generator unit.

Claims

1. A hydroelectric generator main shaft seal condition monitoring system, characterized by: Includes a first pressure sensor (50) and a second pressure sensor (80). Multiple pressure measuring holes (40) are provided on the floating component of the hydro-generator set. The pressure measuring holes (40) penetrate the floating component from top to bottom. The lower end of the pressure measuring hole (40) is connected to the clean water annular cavity (31) located at the bottom of the floating component. The first pressure sensor (50) is installed at the upper end of the pressure measuring hole (40). The second pressure sensor (80) is used to measure the water pressure in the muddy water cavity (3) of the hydro-generator set.

2. The monitoring system for the sealing condition of the main shaft of a hydroelectric generator unit according to claim 1, characterized in that: A through hole (4) is provided on the fixed frame (2) of the hydro-generator unit. The through hole (4) is connected to the muddy water chamber (3). The second pressure sensor (80) is installed at the upper end of the through hole (4).

3. The monitoring system for the sealing condition of the main shaft of a hydroelectric generator unit according to claim 1, characterized in that: The floating assembly includes a floating ring (20) and a sealing ring (30). The sealing ring (30) is fixedly installed at the bottom of the floating ring (20). The water purification ring cavity (31) is located at the bottom of the sealing ring (30). The pressure measuring hole (40) is located on the floating ring (20) and the sealing ring (30).

4. The seal condition monitoring system for a main shaft of a hydroelectric generator unit according to claim 3, characterized in that: The pressure measuring hole (40) includes a first connecting hole (41), a second connecting hole (42) and a third connecting hole (44) located in the floating ring (20), and a fourth connecting hole (45) located in the sealing ring (30). The first connecting hole (41), the second connecting hole (42), the third connecting hole (44) and the fourth connecting hole (45) are connected in sequence, and the fourth connecting hole (45) is connected to the water purification ring cavity (31). The first pressure sensor (50) is installed at the upper end of the first connecting hole (41).

5. The seal condition monitoring system for a main shaft of a hydroelectric generator unit according to claim 1, characterized in that: A three-way ball valve (60) is installed at the upper end of the pressure measuring hole (40), and a first pressure sensor (50) is installed on one of the ports (61) of the three-way ball valve (60).

6. A monitoring system for the sealing status of a hydro-generator main shaft according to any one of claims 1 to 5, characterized in that: It also includes a displacement detection mechanism (70), which is used to measure the upward displacement of the floating component.

7. The seal condition monitoring system for a hydroelectric generator main shaft according to claim 6, characterized in that: The displacement detection mechanism (70) includes a displacement sensor (75), which is mounted on a fixed frame (2) via a bracket (74). The displacement sensor (75) is a contact displacement sensor, and the measuring end (751) of the displacement sensor (75) is in contact with the floating component to measure the upward displacement of the floating component.

8. The seal condition monitoring system for a hydroelectric generator main shaft according to claim 6, characterized in that: The displacement detection mechanism (70) includes a first ear seat (71), a second ear seat (72), a lever (73), and a displacement sensor (75). The first ear seat (71) is fixedly installed on the top of the floating assembly, the second ear seat (72) is fixedly installed on the fixed frame (2), the displacement sensor (75) is installed on the fixed frame (2) through a bracket (74), and the displacement sensor (75) is located on the side away from the floating assembly. The displacement sensor (75) is a contact displacement sensor. One end of the lever (73) is hinged to the first ear seat (71), and the other end is hinged to the measuring end (751) of the displacement sensor (75). The middle part of the lever (73) is hinged to the second ear seat (72), and the distance between the second ear seat (72) and the displacement sensor (75) is at least twice the distance between the first ear seat (71) and the second ear seat (72).

9. The seal condition monitoring system for a hydroelectric generator main shaft according to claim 8, characterized in that: The lever (73) is hinged to the first ear seat (71) at one end and has a first elongated hole (711).

10. The seal condition monitoring system for a hydroelectric generator main shaft according to claim 8, characterized in that: The lever (73) is hinged to the displacement sensor (75) at one end, which is provided with a longitudinal slot. The lever (73) is provided with a transverse through second elongated hole (712) at the slot. The measuring end (751) of the displacement sensor (75) is fixedly installed with a connecting seat (76). The connecting seat (76) is provided with protruding rods (761) on both sides. The connecting seat (76) is located in the slot, and the rods (761) on both sides of the connecting seat (76) are respectively inserted into the second elongated holes (712) on both sides.

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