Alarm device and method for monitoring water leakage of ball valve and pressure steel pipe of hydropower station

Abstract

The invention discloses an alarm device and method for monitoring water leakage of a ball valve and a pressure steel pipe of a hydropower station, the alarm device comprises a water collecting box arranged below a place where leakage easily occurs, a liquid level switch is arranged on the inner wall of the water collecting box, and the liquid level switch is connected with an alarm and a storage battery through a first circuit; the storage battery is further connected with a relay through a second circuit, the relay is connected with the power supply end of a direct-current generator through a third circuit, the power input end of the direct-current generator is connected with the output end of a reversing speed change gear mechanism, and an input gear of the reversing speed change gear mechanism is meshed with an arc-shaped toothed rail adhered to a ball valve crank arm. The device can be separated from an external power supply to work independently, the operation reliability of the device is greatly improved, the characteristics of unattended operation and few-person on duty of an operation equipment site can be met, the labor intensity of personnel is greatly relieved, and the application range is wide.

Description

Technical Field

[0001] The invention relates to the technical field of water leakage monitoring of ball valves and pressure steel pipes in hydropower stations, in particular to an alarm device and method for water leakage monitoring of ball valves and pressure steel pipes in hydropower stations. Background Art

[0002] At present, the main water inlet ball valve is installed at the inlet of the water diversion channel of conventional hydropower stations and pumped storage power stations with higher water heads to stop water. In particular, pumped storage power stations have the characteristics of flexible operation and fast start and stop. The frequency of ball valve operation is relatively high, and the ball valve pivot seal, expansion joint and other parts are prone to wear and aging, thus causing water leakage. At present, the discovery of the above-mentioned water leakage phenomenon is mostly carried out by manual inspection, which is prone to aggravating the leakage phenomenon due to untimely discovery. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide an alarm device and method for monitoring water leakage of ball valves and pressure steel pipes in hydropower stations to solve the problems raised in the background technology.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: an alarm device for monitoring water leakage of ball valves and pressure steel pipes in hydropower stations, including a water collecting box arranged below a location prone to leakage, a liquid level switch is arranged on the inner wall of the water collecting box, the liquid level switch is connected to the alarm and the battery through a first circuit, the battery is also connected to a relay through a second circuit, the relay is connected to the power supply end of the DC generator through a third circuit, the power input end of the DC generator is connected to the output end of the reversing speed gear mechanism, and the input gear of the reversing speed gear mechanism is meshed with the arc-shaped rack at the ball valve crank arm.

[0005] Preferably, a diode is further provided on the second circuit.

[0006] Preferably, the reversing speed change gear mechanism includes a housing fixedly connected to the surface of the DC generator, and an input gear, a first gear, a reversing gear, a second gear, a third gear, a fourth gear and an output gear are arranged on the housing in sequence from the input end to the output end, the input gear is coaxially connected to the first gear, the first gear is meshed with the reversing gear, the reversing gear is coaxially connected to the guide pulley, the groove of the guide pulley is slidably matched with the guide arc groove provided on the surface of the housing, and when the guide pulley moves in the guide arc groove, the reversing gear is meshed with the second gear or the third gear, the second gear is coaxially connected to the third gear, and the third gear is coaxially connected to the fourth gear, the fourth gear is meshed with the output gear, and the output gear is connected to the power input shaft of the DC generator.

[0007] Preferably, the guiding arc groove is located directly above the first gear and is arranged in a horizontal state.

[0008] Preferably, the water collecting box is a funnel-shaped structure that is wide at the top and narrow at the bottom.

[0009] In addition, the present invention also discloses an alarm method of the alarm device for monitoring water leakage of ball valves and pressure steel pipes in a hydropower station, which comprises the following steps: S1. When the ball valve of the hydropower station is opened or closed with the start and stop of the unit, the ball valve arm will drive the arc-shaped gear track to rotate, so that the input gear meshing with it rotates clockwise or counterclockwise; S2. When the input gear rotates clockwise, it will coaxially drive the first gear to rotate clockwise. At the moment when the first gear rotates clockwise, it will move the reversing gear to make its guide pulley move along the guide arc groove. The reversing gear stops moving when it moves to mesh with the second gear. At this time, the reversing gear rotates counterclockwise and drives the second gear to rotate clockwise, so that the third gear meshing with it rotates counterclockwise. S3, when the input gear rotates counterclockwise, it will coaxially drive the first gear to rotate counterclockwise. At the moment when the first gear rotates counterclockwise, it will move the reversing gear to make its guide pulley move along the guide arc groove. The reversing gear will stop moving when it moves to mesh with the third gear. At this time, the reversing gear will rotate clockwise and drive the third gear to rotate counterclockwise. S4, when the third gear rotates counterclockwise, it will coaxially drive the fourth gear to rotate counterclockwise, so that the output gear meshing with it drives clockwise, and finally drives the power input shaft of the DC generator to always rotate in the clockwise direction, thereby generating DC power; S5. The direct current generated by the direct current generator causes the relay on the third circuit to work, and its contacts are closed to turn on the second circuit, thereby charging the battery; S6. When the ball valve of the hydropower station stops moving, the DC generator stops working, and the relay on the third circuit also stops working, and its contacts are disconnected, causing the second circuit to be disconnected, thereby stopping the charging process of the battery; S7. When water leakage occurs, the liquid level in the water collecting box will continue to rise. When it reaches the set height, the liquid level switch contact changes from disconnected to conductive, making the first circuit conductive. At this time, the battery supplies power to the alarm through the first circuit, and the alarm sounds to remind the staff to come and check the leakage.

[0010] Beneficial effects of the present invention: 1. The present invention can be disconnected from the external power supply and work independently, which greatly improves the operating reliability of the device, and can meet the characteristics of "unmanned and few people on duty" on the operating equipment site, greatly reduces the labor intensity of personnel, and has a wide range of applications.

[0011] 2. The present invention combines the liquid level monitoring process with the battery charging and discharging process through the design of the first circuit, the second circuit, the third circuit and related components, so that the entire alarm device can be disconnected from the external power supply and work independently.

[0012] 3. The present invention uses a reversing speed gear mechanism and an arc-shaped gear track attached to the ball valve arm, so that the movement of the ball valve can be reversingly processed by the reversing speed gear mechanism, so that the DC generator can operate stably, thereby successfully realizing the charging process of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of an alarm device for monitoring water leakage of ball valves and pressure steel pipes in hydropower stations; Figure 2 It is a structural schematic diagram of a reversing speed change gear mechanism; Figure 3 for Figure 2 Schematic diagram of the structure after removing the box; Figure 4 It is a schematic diagram of the structure when the input gear cooperates with the reversing gear when rotating counterclockwise; Figure 5 for Figure 4 A schematic diagram of the structure of the guide pulley and the guide arc groove of the middle reversing gear; Figure 6 It is a structural schematic diagram of the input gear cooperating with the reversing gear when rotating clockwise; Figure 7 for Figure 6 A schematic diagram of the structure of the guide pulley and the guide arc groove of the middle reversing gear; Figure 8 It is a schematic diagram of the structure of the input gear and the arc-shaped gear track attached to the ball valve arm. DETAILED DESCRIPTION

[0014] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] like Figure 1-8 As shown, an alarm device for monitoring water leakage of ball valves and pressure steel pipes in a hydropower station comprises a water collecting box 1 arranged below a place prone to leakage, a liquid level switch 2 is arranged on the inner wall of the water collecting box 1, the liquid level switch 2 is connected to an alarm 3 and a battery 4 through a first circuit 8, the battery 4 is also connected to a relay 10 through a second circuit 9, the relay 10 is connected to a power supply end of a DC generator 7 through a third circuit 11, the power input end of the DC generator 7 is connected to the output end of a reversing speed gear mechanism 8, and the input gear 8.1 of the reversing speed gear mechanism 8 is meshed with an arc-shaped rack 12 sticking to the ball valve crank arm.

[0016] Preferably, a diode 5 is further provided on the second circuit 9. By utilizing the unidirectional conduction characteristic of the diode 5, the storage battery 4 can only be charged through the second circuit 9, but cannot be discharged through the second circuit 9.

[0017] Preferably, if Figure 2 and 3 As shown, the reversing speed gear mechanism 8 includes a housing 8.10 fixedly connected to the surface of the DC generator 7, and the housing 8.10 is provided with an input gear 8.1, a first gear 8.2, a reversing gear 8.3, a second gear 8.4, a third gear 8.5, a fourth gear 8.6 and an output gear 8.7 in sequence from the input end to the output end. The input gear 8.1 is coaxially connected to the first gear 8.2, the first gear 8.2 is meshed with the reversing gear 8.3, and the reversing gear 8.3 is meshed with the guide pulley 8.8. The guide pulley 8.8 is connected to the shaft, and the groove of the guide pulley 8.8 is slidably matched with the guide arc groove 8.9 opened on the surface of the box body 8.10. When the guide pulley 8.8 moves in the guide arc groove 8.9, the reversing gear 8.3 is meshed with the second gear 8.4 or the third gear 8.5. The second gear 8.4 is coaxially connected with the third gear 8.5, and the third gear 8.5 is coaxially connected with the fourth gear 8.6. The fourth gear 8.6 is meshed with the output gear 8.7, and the output gear 8.7 is connected to the power input shaft of the DC generator 7.

[0018] Preferably, the guide arc groove 8.9 is located directly above the first gear 8.2 and is arranged in a horizontal state. With this design, when the guide pulley 8.8 moves to the left or right end of the guide arc groove 8.9, since the left or right end of the guide arc groove 8.9 is slightly inclined downward, the guide pulley 8.8 can be limited and locked by gravity to prevent the guide pulley 8.8 from moving in the opposite direction after moving into position.

[0019] Preferably, the water collecting box 1 is a funnel-shaped structure that is wide at the top and narrow at the bottom. This funnel-shaped structure is convenient for collecting leaked liquid to facilitate the monitoring process of the liquid level switch 2.

[0020] In addition, the present invention also discloses an alarm method of the alarm device for monitoring water leakage of ball valves and pressure steel pipes in a hydropower station, which comprises the following steps: S1, such as Figure 8 As shown, when the ball valve of the hydropower station is opened or closed with the start and stop of the unit, the ball valve arm will drive the arc-shaped rack 12 to rotate (forward or reverse), so that the input gear 8.1 meshing with it rotates clockwise or counterclockwise; S2, such as Figure 6 and 7As shown, when the input gear 8.1 rotates clockwise, it will coaxially drive the first gear 8.2 to rotate clockwise. At the moment when the first gear 8.2 rotates clockwise, it will move the reversing gear 8.3 to make its guide pulley 8.8 move along the guide arc groove 8.9. The reversing gear 8.3 stops moving when it moves to mesh with the second gear 8.4. At this time, the reversing gear 8.3 rotates counterclockwise and drives the second gear 8.4 to rotate clockwise, so that the third gear 8.5 meshing with it rotates counterclockwise. S3, such as Figure 4 and 5 As shown, when the input gear 8.1 rotates counterclockwise, it will coaxially drive the first gear 8.2 to rotate counterclockwise. At the moment when the first gear 8.2 rotates counterclockwise, it will move the reversing gear 8.3 to move the guide pulley 8.8 along the guide arc groove 8.9. The reversing gear 8.3 stops moving when it moves to mesh with the third gear 8.5. At this time, the reversing gear 8.3 rotates clockwise and drives the third gear 8.5 to rotate counterclockwise. S4, when the third gear 8.5 rotates counterclockwise, it will coaxially drive the fourth gear 8.6 to rotate counterclockwise, so that the output gear 8.7 meshing with it drives clockwise, and finally drives the power input shaft of the DC generator 7 to always rotate in the clockwise direction, thereby generating DC power; S5, the DC power generated by the DC generator 7 makes the relay 10 on the third circuit 11 work, and its contact is closed to make the second circuit 9 conduct, thereby charging the battery 4; S6. When the ball valve of the hydropower station stops moving, the DC generator 7 stops working, and the relay 10 on the third circuit 11 also stops working, and its contacts are disconnected, so that the second circuit 9 is disconnected, thereby stopping the charging process of the battery 4; S7. When water leakage occurs, the liquid level in the water collecting box 1 will continue to rise. After reaching the set height, the contact of the liquid level switch 2 changes from disconnected to conductive, so that the first circuit 8 is conductive. At this time, the battery 4 supplies power to the alarm 3 through the first circuit 8. The alarm 3 sounds an alarm to remind the staff to come and check the leakage. In this embodiment, the alarm 3 can use a buzzer to perform a buzzer alarm process.

[0021] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An alarm device for monitoring water leakage of ball valves and penstocks in a hydropower station, comprising a water collecting box (1) arranged below a location prone to leakage, a liquid level switch (2) being arranged on the inner wall of the water collecting box (1), the liquid level switch (2) being connected to an alarm (3) and a battery (4) via a first circuit (8), characterized in that: The storage battery (4) is also connected to the relay (10) via the second circuit (9), the relay (10) is connected to the power supply end of the DC generator (7) via the third circuit (11), the power input end of the DC generator (7) is connected to the output end of the reversing speed gear mechanism (8), and the input gear (8.1) of the reversing speed gear mechanism (8) is meshed with the arc-shaped rack (12) attached to the ball valve arm.

2. An alarm device for monitoring water leakage of ball valves and pressure steel pipes in a hydropower station according to claim 1, characterized in that: The second circuit (9) is also provided with a diode (5).

3. An alarm device for monitoring water leakage of ball valves and pressure steel pipes in a hydropower station according to claim 1, characterized in that: The reversing speed change gear mechanism (8) comprises a housing (8.10) fixedly connected to the surface of the DC generator (7); the housing (8.10) is provided with an input gear (8.1), a first gear (8.2), a reversing gear (8.3), a second gear (8.4), a third gear (8.5), a fourth gear (8.6) and an output gear (8.7) in sequence from the input end to the output end; the input gear (8.1) and the first gear (8.2) are coaxially connected; the first gear (8.2) and the reversing gear (8.3) are meshed; the reversing gear (8.3) and the guide pulley (8.8) are coaxially connected. The guide pulley (8.8) is connected to the housing (8.10) by a shaft, the groove of the guide pulley (8.8) is slidably matched with the guide arc groove (8.9) provided on the surface of the housing (8.10), the guide pulley (8.8) makes the reversing gear (8.3) mesh with the second gear (8.4) or the third gear (8.5) when moving in the guide arc groove (8.9), the second gear (8.4) and the third gear (8.5), the third gear (8.5) and the fourth gear (8.6) are coaxially connected, the fourth gear (8.6) meshes with the output gear (8.7), and the output gear (8.7) is connected to the power input shaft of the DC generator (7).

4. An alarm device for monitoring water leakage of ball valves and pressure steel pipes in a hydropower station according to claim 3, characterized in that: The guide arc groove (8.9) is located directly above the first gear (8.2) and is arranged in a horizontal state.

5. The alarm device for monitoring water leakage of ball valves and pressure steel pipes in a hydropower station according to claim 1, characterized in that: The water collecting box (1) is a funnel-shaped structure that is wide at the top and narrow at the bottom.

6. An alarm method of the alarm device for monitoring water leakage of ball valves and pressure steel pipes in a hydropower station according to any one of claims 1 to 5, characterized in that: It includes the following steps: S1. When the ball valve of the hydropower station is opened or closed with the start and stop of the unit, the ball valve arm will drive the arc-shaped rack (12) to rotate, thereby causing the input gear (8.1) meshing with it to rotate clockwise or counterclockwise; S2. When the input gear (8.1) rotates clockwise, it will coaxially drive the first gear (8.2) to rotate clockwise. At the moment when the first gear (8.2) rotates clockwise, it will move the reversing gear (8.3) to move the guide pulley (8.8) along the guide arc groove (8.9). The reversing gear (8.3) stops moving when it moves to mesh with the second gear (8.4). At this time, the reversing gear (8.3) rotates counterclockwise and drives the second gear (8.4) to rotate clockwise, so that the third gear (8.5) meshing with it rotates counterclockwise. S3. When the input gear (8.1) rotates counterclockwise, it will coaxially drive the first gear (8.2) to rotate counterclockwise. At the moment when the first gear (8.2) rotates counterclockwise, it will move the reversing gear (8.3) to move the guide pulley (8.8) along the guide arc groove (8.9). The reversing gear (8.3) stops moving when it moves to mesh with the third gear (8.5). At this time, the reversing gear (8.3) rotates clockwise and drives the third gear (8.5) to rotate counterclockwise. S4, when the third gear (8.5) rotates counterclockwise, it will coaxially drive the fourth gear (8.6) to rotate counterclockwise, so that the output gear (8.7) meshing with it is driven clockwise, and finally the power input shaft of the DC generator (7) is driven to rotate in the clockwise direction all the time, thereby generating DC power; S5, the direct current generated by the direct current generator (7) causes the relay (10) on the third circuit (11) to operate, and its contacts are closed to turn on the second circuit (9), thereby charging the storage battery (4); S6. When the ball valve of the hydropower station stops moving, the DC generator (7) stops working, and the relay (10) on the third circuit (11) also stops working, and its contacts are disconnected, causing the second circuit (9) to be disconnected, thereby stopping the charging process of the storage battery (4); S7. When water leakage occurs, the liquid level in the water collecting box (1) will continue to rise. When it reaches a set height, the contact of the liquid level switch (2) changes from disconnected to conductive, so that the first circuit (8) is conductive. At this time, the storage battery (4) supplies power to the alarm (3) through the first circuit (8), and the alarm (3) sounds an alarm to remind the staff to come and check the leakage.

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