A security alarm device for a hydropower station

Abstract

The application discloses a kind of security alarm devices for hydroelectric station in the technical field of water conservancy equipment, including fixed box, the upper end surface of the fixed box is connected with top cover, the surface of the top cover is connected with alarm lamp and siren, the inside of the fixed box is connected with partition, the upper end surface of the partition is connected with battery, the structure of the present application is set through alarm lamp and siren, battery, magnetic block A, magnetic block B and conductor, when the fixed box is installed above water surface, the floating pad floats up and down on water surface, drives conductor to linearly move in the magnetic field between magnetic block A and magnetic block B, further, when conductor linearly moves vertically between magnetic block A and magnetic block B, conductor will cut magnetic induction line motion, induced current will be generated on conductor, further, current is transported to battery for storage through conductor, for the use of alarm lamp and siren, so as to facilitate the device to store power in the environment without external power supply, and automatically alarm when used.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of water conservancy equipment, and particularly relates to a security alarm device for a hydropower station. BACKGROUND

[0002] A hydropower station is a large-scale water power generation facility built in a river or water flow. It can convert the kinetic energy of water flow into electric energy and is an important part of the modern energy industry. The operation of a hydropower station cannot be separated from the monitoring of the water level, because the change of the water level may directly affect the operation efficiency and safety of the power station. The traditional water level monitoring method is mainly realized through a water level gauge, but due to the fact that the construction site of the hydropower station is usually high and low, the installation of the water level gauge is difficult, and in actual use, the problems of low precision, high maintenance cost and the like exist.

[0003] According to the search, a security alarm device for a hydropower station is disclosed in Chinese Patent No. CN201821429235.2, which comprises an alarm host body and a circular fixing plate. Four grooves are arranged on the upper surface of the circular fixing plate, and the four grooves are located on the circumference of the same circle, and the connecting line of the four grooves in sequence is a square. The bottom of the groove is fixedly connected with a first elastic device, and the end of the first elastic device away from the bottom of the groove is connected with a positioning block matched with the groove.

[0004] The beneficial effects of the above-mentioned device are that the circular fixing plate is fixed on the wall surface through screws, and the alarm host body and the circular fixing plate are detachably connected, so that the wall surface is not damaged during the disassembly process when the alarm host body needs to be replaced or overhauled.

[0005] The above-mentioned device is fixed by the installation structure to the alarm device, and the alarm device cannot be independently operated for a long time without external power supply, and the battery does not need to be replaced regularly, which causes the problems of high labor intensity and high use cost. Therefore, we propose a security alarm device for a hydropower station. SUMMARY

[0006] The purpose of the present application is to provide a security alarm device for a hydropower station to solve the problems in the background art.

[0007] In order to achieve the above object, the present application provides the following technical scheme: A security alarm device for a hydropower station, comprising a fixed box, the upper end surface of the fixed box is connected with a top cover, the surface of the top cover is connected with an alarm lamp and an alarm, the inside of the fixed box is connected with a partition plate, the upper end surface of the partition plate is connected with a battery, the lower end surface of the partition plate is connected with a magnetic block A and a magnetic block B, the magnetic properties of the magnetic block A and the magnetic block B repel each other, the lower end surface of the fixed box is provided with an opening, and the lower end surface of the opening is connected with a limiting sleeve, the inside of the limiting sleeve is inserted with a connecting rod, the upper end of the connecting rod is inserted into the inside of the fixed box, the upper end surface of the connecting rod is connected with a fixed seat, the surface of the fixed seat is provided with a bayonet, the bayonet is connected with a conductor, the conductor is inserted between the magnetic block A and the magnetic block B, the lower end of the connecting rod is connected with a floating pad, both ends of the conductor are connected with wires, and the two groups of wires are connected with the battery.

[0008] Preferably, the surface of the top cover is connected with a glass cover, which covers the surface of the alarm lamp and the alarm.

[0009] Preferably, the lower end surface of the limiting sleeve is provided with a funnel, and the lower end radius of the funnel is larger than the upper end radius.

[0010] Preferably, the lower end surface of the fixed box is connected with two groups of limiting sleeves, and the connecting rods are inserted into the two groups of limiting sleeves, and the two ends of the conductor are connected to the fixed seats connected to the upper ends of the two groups of connecting rods.

[0011] Preferably, the lower end surface of the fixed box is connected with a fixer, the inside of the fixer is connected with a water pumping pipe, one end of the water pumping pipe is inserted into a through hole arranged on the surface of the floating pad, the other end of the water pumping pipe is connected with a negative pressure pipe, the inside of the negative pressure pipe is inserted with a piston pad, the lower end surface of the piston pad is connected with a piston rod, the lower end of the piston rod is connected to the surface of the floating pad, the water pumping pipe and the negative pressure pipe form a "U" type structure, the lower end of the water pumping pipe is inserted below the water surface, the upper end surface of the water pumping pipe is connected with a tilt pipe, the tilt pipe is connected with the water pumping pipe, the other end of the tilt pipe is connected to the limiting sleeve, and the inside of the tilt pipe is connected with the limiting sleeve.

[0012] Preferably, one end of the tilt pipe on the surface of the water pumping pipe is higher than one end of the limiting sleeve, and a one-way valve is installed in the inside of the tilt pipe.

[0013] Preferably, the diameter of the negative pressure pipe is larger than the diameter of the water pumping pipe.

[0014] Preferably, the alarm lamp and siren and the battery are connected through a power-on mechanism, the surface of the partition plate is provided with an opening, the power-on mechanism comprises a fixed box mounted above the opening of the partition plate, the inside of the fixed box is connected with a fixed electrode A and a fixed electrode B, the fixed electrode A is connected with the battery through a wire A, the fixed electrode B is connected with the alarm lamp and siren through a wire B, the surface of the fixed seat is connected with a connecting plate, the upper end surface of the connecting plate is sleeved with a movable electrode, and the spacing between the fixed electrode A and the fixed electrode B is matched with the size of the movable electrode.

[0015] Preferably, the two side surfaces of the movable electrode are provided with protrusions, the two side surfaces of the fixed box are provided with openings, and the outer sides of the openings are connected with limiting sleeves, the inside of the limiting sleeve is inserted with a limiting plate, the surface of the limiting plate is connected with a limiting clamping block, the limiting clamping block is inserted into the inside of the fixed box through the opening in the surface of the fixed box, and the other end surface of the limiting plate is connected with a return spring, and the other end of the return spring is connected to the inner wall of the limiting sleeve.

[0016] Preferably, the surface of the partition plate is connected with an electric telescopic rod, the piston rod of the electric telescopic rod downwardly penetrates the partition plate and is connected with a push rod, the push rod is located above the conductor, and the lower end surface of the fixed seat is connected with a sealing gasket.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1. According to the structure of the alarm lamp and siren, the battery, the magnetic block A, the magnetic block B and the conductor, when the fixed box is installed above the water surface, the floating pad floats up and down on the water surface, drives the conductor to linearly move in the magnetic field between the magnetic block A and the magnetic block B, and when the conductor linearly moves vertically between the magnetic block A and the magnetic block B, the conductor cuts the magnetic induction lines to generate an induced current, and the current is transmitted to the battery through the wire for storage, so that the device can store power in an environment without external power supply and automatically alarm during use.

[0019] 2. According to the power-on mechanism, the alarm lamp and siren and the battery are connected, when the water surface rises abnormally, the control connecting rod rises quickly, the movable electrode is inserted between the power-on mechanisms to form a complete circuit between the battery, the wire A, the fixed electrode A, the movable electrode, the fixed electrode B, the wire B and the alarm lamp and siren, so as to control the alarm lamp and siren to issue an alarm to remind the staff that the water surface has risen to the alarm line position, and at the same time, the inside of the fixed box is sealed, so that when the fixed box is flooded, the alarm can also be issued, the internal structure of the fixed box is prevented from being damaged, the cost loss is avoided, and the personnel cannot be timely alarmed. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Structure diagram of the present application;

[0021] Figure 2 Structure diagram of the present application;

[0022] Figure 3 Structure diagram of the present application;

[0023] Figure 4 Structure diagram of the present application;

[0024] Figure 5 Structure diagram of the present application;

[0025] Figure 6 Structure diagram of the present application;

[0026] Figure 7 Structure diagram of the present application;

[0027] Figure 8 Structure diagram of the present application;

[0028] In the figure: 1, fixed box; 2, top cover; 3, alarm lamp and alarm; 4, glass cover; 5, partition; 6, battery; 7, magnetic block A; 8, magnetic block B; 9, conductor; 10, wire; 11, connecting rod; 12, floating pad; 13, fixed seat; 14, bayonet; 15, limiting sleeve; 16, funnel; 17, fixator; 18, water suction pipe; 19, through hole; 20, negative pressure pipe; 21, piston rod; 22, piston pad; 23, inclined pipe; 24, connecting plate; 25, movable electrode; 26, protruding block; 27, fixed box; 28, fixed electrode A; 29, wire A; 30, fixed electrode B; 31, wire B; 32, limiting sleeve; 33, limiting plate; 34, limiting block; 35, reset spring; 36, electric telescopic rod; 37, push rod; 38, sealing pad. DETAILED DESCRIPTION

[0029] Example one

[0030] Please refer to Figures 1-8 , the present application provides a technical solution:

[0031] A security alarm device for a hydropower station, the fixed box 1 is set as a box and the inside of the fixed box 1 is hollow, the inside of the fixed box 1 is used for installing working parts, the upper end surface of the fixed box 1 is connected with the top cover 2, the surface of the top cover 2 is connected with the alarm lamp and alarm 3, when the device detects that the water level rises to the alarm line, the alarm lamp and alarm 3 will be automatically turned on, issuing warning light and warning alarm, so as to the staff;

[0032] The surface of the top cover 2 is connected with a glass cover 4, which covers the surface of the alarm lamp and siren 3, seals and wraps the alarm lamp and siren 3, and makes the alarm lamp and siren 3 in a dry and dust-free environment, so as to avoid the alarm lamp and siren 3 from being damaged by collision or dust and water seepage;

[0033] The inside of the fixed box 1 is connected with a partition plate 5, the upper end surface of the partition plate 5 is connected with a battery 6, the alarm lamp and siren 3 are electrically connected with the battery 6, the battery 6 can supply power to the alarm lamp and siren 3, and the automatic work of the alarm lamp and siren 3 is realized;

[0034] The lower end surface of the partition plate 5 is connected with a magnetic block A 7 and a magnetic block B 8, the magnetic block A 7 and the magnetic block B 8 are respectively located at both sides of the inside of the fixed box 1, the magnetic properties of the magnetic block A 7 and the magnetic block B 8 are repulsive, a magnetic field is generated between the magnetic block A 7 and the magnetic block B 8, a conductor 9 is inserted between the magnetic block A 7 and the magnetic block B 8, both ends of the conductor 9 are connected with wires 10, and the two groups of wires 10 are connected with the battery 6, so that an electric circuit loop is formed between the conductor 9, the battery 6 and the two groups of wires 10, when the conductor 9 moves linearly and vertically between the magnetic block A 7 and the magnetic block B 8, the conductor 9 will move cutting the magnetic induction lines, an induced current will be generated on the conductor 9, the current is further transmitted to the battery 6 through the wires 10 for storage, and the alarm lamp and siren 3 are used, so that the device can store power in an environment without external power supply, and automatically alarm when used;

[0035] The fixed box 1 needs to be installed above the water surface when in use, the lower end surface of the fixed box 1 is provided with an opening, the lower end surface of the opening is connected with a limiting sleeve 15, a connecting rod 11 is inserted in the inside of the limiting sleeve 15, the upper end of the connecting rod 11 is inserted in the inside of the fixed box 1, the upper end surface of the connecting rod 11 is connected with a fixing seat 13, the surface of the fixing seat 13 is provided with a bayonet 14, the conductor 9 is fixedly connected in the bayonet 14 provided on the surface of the fixing seat 13, when the fixed box 1 is fixed on the water surface, the floating pad 12 floats on the water surface, when the water surface has water waves, the floating pad 12 is pushed to slide up and down on the water surface by the water waves, the floating pad 12 is limited by being inserted in the limiting sleeve 15, so that the floating pad 12 can only slide vertically up and down, further pushing the conductor 9 to slide linearly and vertically between the magnetic block A 7 and the magnetic block B 8, forming a cutting magnetic induction line movement, the conductor 9 is driven by the water waves, and the power storage of the battery 6 is realized;

[0036] Meanwhile, the lower end inner wall of the fixed box 1 is provided with two groups of openings, which are respectively located at both ends of the conductor 9, the lower ends of the two groups of openings are connected with limiting sleeves 15, the connecting rods 11 are inserted in the limiting sleeves 15, the conductor 9 is fixedly installed by the two groups of connecting rods 11, so that the both ends of the conductor 9 always maintain a horizontal height when the conductor 9 slides linearly in the fixed box 1, thereby effectively cutting the magnetic induction lines.

[0037] The lower end surface of the limiting sleeve 15 is provided with a funnel 16, the lower end radius of the funnel 16 is larger than the upper end radius, so that when the floating pad 12 floats up and down on the water surface, the water waves washed by the water surface will hit the inner wall of the funnel 16 and flow out along the inner wall of the funnel 16, thereby avoiding the dust caused by the water waves from entering the inside of the limiting sleeve 15, causing the dust to be stuck between the inner wall of the limiting sleeve 15 and the surface of the connecting rod 11, resulting in the connecting rod 11 being stuck and unable to slide;

[0038] The lower end surface of the fixed box 1 is connected with a fixer 17, the inside of the fixer 17 is connected with a water suction pipe 18, one end of the water suction pipe 18 is inserted into the through hole 19 arranged on the surface of the floating pad 12, so that the floating pad 12 always fixes and relatively slides in the through hole 19 during the up and down floating process, and the other end of the water suction pipe 18 is connected with a negative pressure pipe 20, the inside of the negative pressure pipe 20 is inserted with a piston pad 22, the lower end surface of the piston pad 22 is connected with a piston rod 21, the lower end of the piston rod 21 is connected to the surface of the floating pad 12, the water suction pipe 18 and the negative pressure pipe 20 form a "U" type structure fixed on the fixed box 1, and the lower end of the water suction pipe 18 is inserted under the water surface:

[0039] When the floating pad 12 floats up and down on the water surface, the piston rod 21 will drive the piston pad 22 to slide up and down in the negative pressure pipe 20, and through the piston movement of the piston pad 22 in the negative pressure pipe 20, the floating pad 12 will push the piston pad 22 to slide up when rising, and the gas medium in the negative pressure pipe 20 is extruded;

[0040] When the floating pad 12 descends, the piston pad 22 moves downward in the negative pressure pipe 20, and the piston pad 22 will extract the gas medium in the negative pressure pipe 20, so that a negative pressure is formed in the negative pressure pipe 20, and further through the lower end of the water suction pipe 18, water is sucked into the water suction pipe 18, the upper end surface of the water suction pipe 18 is connected with a inclined pipe 23, the inclined pipe 23 and the water suction pipe 18 are connected in communication, and the other end of the inclined pipe 23 is connected to the limiting sleeve 15, the inclined pipe 23 and the limiting sleeve 15 are also connected in communication, when the piston pad 22 extracts the water level in the water suction pipe 18 to the opening of the inclined pipe 23, the water will enter the inside of the inclined pipe 23, and the end of the inclined pipe 23 located on the surface of the water suction pipe 18 is higher than the end of the limiting sleeve 15, so that the water in the inclined pipe 23 will be transported into the limiting sleeve 15, and the gap between the limiting sleeve 15 and the connecting rod 11 is cleaned, avoiding the sliding jam of the connecting rod 11 caused by the gap between the limiting sleeve 15 and the connecting rod 11;

[0041] The diameter of the negative pressure pipe 20 is larger than that of the water suction pipe 18, so that the piston pad 22 can form a strong negative pressure when moving in the negative pressure pipe 20, further controlling the water suction pipe 18 to suck water, and the one-way valve is installed in the inner part of the inclined pipe 23, so that when the piston pad 22 slides upward in the negative pressure pipe 20, the water in the inclined pipe 23 can be pushed into the limiting sleeve 15, and when the piston pad 22 slides downward in the negative pressure pipe 20, no air is sucked, so that the air pressure in the negative pressure pipe 20 is balanced with the outside air pressure;

[0042] The alarm lamp and alarm 3 and the battery 6 are connected through the energizing mechanism, the surface of the partition plate 5 is provided with an opening, and the energizing mechanism is installed above the opening of the partition plate 5. The energizing mechanism includes a fixed box 27 installed above the opening of the partition plate 5, and the fixed box 27 is connected with a fixed electrode A 28 and a fixed electrode B 30 inside. The fixed electrode A 28 is connected with the battery 6 through the wire A 29, and the fixed electrode B 30 is connected with the alarm lamp and alarm 3 through the wire B 31. When the water level of the fixed position of the fixed box 1 is normal, the fixed electrode A 28 and the fixed electrode B 30 are not connected, so that the alarm lamp and alarm 3 and the battery 6 form an open circuit, and at this time, the triggering of the alarm lamp and alarm 3 will not be controlled;

[0043] When the water level of the fixed position of the fixed box 1 is abnormal, the floating pad 12 will gradually rise, and the connecting rod 11 will continue to rise by being inserted into the fixed box 1. The surface of the fixed seat 13 is connected with a connecting plate 24, and the upper end surface of the connecting plate 24 is sleeved with a movable electrode 25. The spacing between the fixed electrode A 28 and the fixed electrode B 30 is matched with the size of the movable electrode 25. When the connecting rod 11 drives the fixed seat 13 to continue to rise in the fixed box 1, the movable electrode 25 will slide upward and penetrate the opening on the surface of the partition plate 5, and be inserted into the inside of the fixed box 27. When the movable electrode 25 is inserted into the inside of the fixed box 27, it just touches the surface of the fixed electrode A 28 and the fixed electrode B 30, further forming a complete circuit between the battery 6, the wire A 29, the fixed electrode A 28, the movable electrode 25, the fixed electrode B 30, the wire B 31, and the alarm lamp and alarm 3, so as to control the alarm lamp and alarm 3 to issue an alarm, reminding the staff that the water level has risen to the alarm line position;

[0044] And the two sides of the surface of the movable electric level 25 are provided with protrusions 26, the two sides of the surface of the fixed box 27 are provided with openings, the outer side of the opening is connected with a limiting sleeve 32, the inside of the limiting sleeve 32 is inserted with a limiting plate 33, the surface of the limiting plate 33 is connected with a limiting clamping block 34, the limiting clamping block 34 is inserted in the inside of the fixed box 27 through the opening in the surface of the fixed box 27, and the other end surface of the limiting plate 33 is connected with a return spring 35, the other end of the return spring 35 is connected to the inner wall of the limiting sleeve 32, when the movable electric level 25 rises, the protrusions 26 will push the limiting clamping block 34 to slide to the inside of the limiting sleeve 32, the limiting clamping block 34 is connected with the limiting plate 33 to slide in the limiting sleeve 32 in the sliding process, the limiting plate 33 extrudes the return spring 35 to form elastic storage, when the protrusions 26 slide to the upper of the limiting clamping block 34, the limiting plate 33 is pushed back under the action of the elastic force of the return spring 35, causing the limiting clamping block 34 to reset to clamp the protrusions 26, forming the fixation of the protrusions 26, further maintaining the circuit communication between the alarm lamp and alarm 3 and the battery 6, continuously issuing an alarm;

[0045] The surface of the partition plate 5 is connected with an electric telescopic rod 36, the piston rod of the electric telescopic rod 36 downwardly penetrates the partition plate 5 and is connected with a push rod 37, the push rod 37 is located above the conductor 9, when the circuit between the alarm lamp and alarm 3 and the battery 6 is communicated, the electric telescopic rod 36 is controlled to drive the push rod 37 to slide downwardly, the conductor 9 is pushed to slide downwardly by the push rod 37, the connecting rod 11 is further controlled to slide downwardly in the fixed box 1, when the fixed seat 13 slides downwardly, the movable electric level 25 is clamped in the fixed box 27 by the protrusions 26 and the limiting clamping block 34, maintaining the circuit communication between the alarm lamp and alarm 3 and the battery 6. The movable electric level 25 is detached from the connecting plate 24, and the lower end surface of the fixed seat 13 is connected with a sealing gasket 38, the fixed seat 13 is pushed to slide downwardly by the push rod 37, until the sealing gasket 38 abuts on the opening in the lower end surface of the fixed box 1, realizing the sealing of the inside of the fixed box 1, avoiding the fixed box 1 from being flooded due to the rising water level, causing the damage of the internal structure, causing the cost loss, and unable to timely alarm the personnel.

Claims

1. A security alarm device for a hydropower station, comprising a fixed box (1), characterized in that: The upper end surface of the fixed box (1) is connected with a top cover (2), the surface of the top cover (2) is connected with an alarm lamp and an alarm (3), the inside of the fixed box (1) is connected with a partition plate (5), the upper end surface of the partition plate (5) is connected with a battery (6), the lower end surface of the partition plate (5) is connected with a magnetic block A (7) and a magnetic block B (8), the magnetic block A (7) and the magnetic block B (8) repel each other, the lower end surface of the fixed box (1) is provided with an opening, and the lower end surface of the opening is connected with a limiting sleeve (15), the inside of the limiting sleeve (15) is inserted with a connecting rod (11), the upper end of the connecting rod (11) is inserted into the inside of the fixed box (1), the upper end surface of the connecting rod (11) is connected with a fixed seat (13), the surface of the fixed seat (13) is provided with a bayonet (14), the bayonet (14) is connected with a conductor (9), the conductor (9) is inserted between the magnetic block A (7) and the magnetic block B (8), the lower end of the connecting rod (11) is connected with a floating pad (12), both ends of the conductor (9) are connected with wires (10), and the two groups of wires (10) are connected with the battery (6); The alarm lamp and the alarm (3) and the battery (6) are connected through a power supply mechanism, the surface of the partition plate (5) is provided with an opening, the power supply mechanism comprises a fixed box (27) mounted above the opening of the partition plate (5), the inside of the fixed box (27) is connected with a fixed electrode A (28) and a fixed electrode B (30), the fixed electrode A (28) is connected with the battery (6) through a wire A (29), the fixed electrode B (30) is connected with the alarm lamp and the alarm (3) through a wire B (31), the surface of the fixed seat (13) is connected with a connecting plate (24), the upper end surface of the connecting plate (24) is sleeved with a movable electrode (25), and the spacing between the fixed electrode A (28) and the fixed electrode B (30) is matched with the size of the movable electrode (25); The two side surfaces of the movable electrode (25) are provided with protrusions (26), the two side surfaces of the fixed box (27) are provided with openings, and the outer sides of the openings are connected with limiting sleeves (32), the inside of the limiting sleeve (32) is inserted with a limiting plate (33), the surface of the limiting plate (33) is connected with a limiting clamping block (34), the limiting clamping block (34) penetrates through the opening in the surface of the fixed box (27) and is inserted into the inside of the fixed box (27), the other end surface of the limiting plate (33) is connected with a reset spring (35), and the other end of the reset spring (35) is connected to the inner wall of the limiting sleeve (32); The surface of the partition plate (5) is connected with an electric telescopic rod (36), the piston rod of the electric telescopic rod (36) penetrates downwardly through the partition plate (5) and is connected with a push rod (37), the push rod (37) is located above the conductor (9), and the lower end surface of the fixed seat (13) is connected with a sealing gasket (38).

2. The security alarm device for a hydropower station according to claim 1, characterized in that: The surface of the top cover (2) is connected with a glass cover (4), and the glass cover (4) covers the surface of the alarm lamp and the alarm (3).

3. The security alarm device for a hydropower station according to claim 1, characterized in that: The lower end surface of the limiting sleeve (15) is provided with a funnel (16), the lower end radius of the funnel (16) is larger than the upper end radius.

4. The security alarm device for a hydropower station according to claim 1, characterized in that: The lower end surface of the fixing box (1) is connected with two groups of limiting sleeves (15), two groups of the limiting sleeves (15) are both provided with the connecting rods (11), and the two ends of the conductor (9) are respectively connected to the fixing bases (13) connected to the upper ends of the two groups of connecting rods (11).

5. The security alarm device for a hydropower station according to claim 1, characterized in that: The lower end surface of the fixing box (1) is connected with the fixer (17), the inside of the fixer (17) is connected with the water pumping pipe (18), one end of the water pumping pipe (18) is inserted into the through hole (19) arranged on the surface of the floating pad (12), the other end of the water pumping pipe (18) is connected with the negative pressure pipe (20), the inside of the negative pressure pipe (20) is inserted with the piston pad (22), the lower end surface of the piston pad (22) is connected with the piston rod (21), the lower end of the piston rod (21) is connected to the surface of the floating pad (12), the water pumping pipe (18) and the negative pressure pipe (20) form a "U" type structure, the lower end of the water pumping pipe (18) is inserted below the water surface, the upper end surface of the water pumping pipe (18) is connected with the inclined pipe (23), the inclined pipe (23) and the water pumping pipe (18) are connected with each other, the other end of the inclined pipe (23) is connected to the limiting sleeve (15), and the inclined pipe (23) and the inside of the limiting sleeve (15) are connected with each other.

6. The security alarm device for a hydropower station according to claim 5, characterized in that: The one end of the inclined pipe (23) located on the surface of the water pumping pipe (18) is higher than the one end of the limiting sleeve (15), and the inside of the inclined pipe (23) is mounted with the one-way valve.

7. The security alarm device for a hydropower station according to claim 5, characterized in that: The diameter of the negative pressure pipe (20) is larger than the diameter of the water pumping pipe (18).

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