Safety protection device for water turbine in water-power engineering

Abstract

The invention relates to the technical field of hydroelectric energy, in particular to a safety protection device for a hydroelectric engineering water turbine, which comprises a stator, a rotor arranged in the stator, a protective cover and an impeller assembly rotationally mounted in the protective cover, the impeller assembly comprises a rotating shaft and blades annularly and uniformly distributed on the outer cylindrical surface of the rotating shaft; the stators are mounted right above the protective cover at intervals through a plurality of U-shaped supporting rods; the rotor sleeves the upper end of the rotating shaft; a containing assembly is installed at the lower end of the rotating shaft, an anti-corrosion assembly is arranged in the containing assembly, and the anti-corrosion assembly comprises a zinc plate. The primary battery is formed by water flow and the zinc plate, the zinc plate is used as the anode, and the impeller assembly is prevented from being corroded by corrosive substances in the water body in an anode sacrificing mode, so that the service life of the impeller assembly is prolonged. As the corrosion condition is reduced, the condition of axis deviation of the rotating shaft can be reduced, and structural abrasion and vibration caused by rotating shaft deflection are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of hydropower energy, and in particular to a safety protection device for a water turbine in a hydropower project. Background Art

[0002] A water turbine is a power generation device that converts the kinetic energy of water flow into electrical energy and is mainly used for power generation in water conservancy projects.

[0003] All existing water turbines have cavitation, which is inevitable, especially when the water contains a large amount of corrosive substances (such as seawater). After long-term use, the surface of the turbine impeller will be deformed and corroded, causing the output shaft to deflect during rotation, thereby aggravating structural wear. The conventional method now is to use high-strength materials to make the impeller, or spray or electroplate anti-corrosion or hardness-enhanced materials on the impeller surface. However, the preparation process is complicated and costly. At the same time, when the output shaft deflects, it is not easy to detect, which makes the best maintenance time missed. Summary of the invention

[0004] The main purpose of the present invention is to provide a safety protection device for a water turbine in a hydropower project, aiming to solve the above technical problems.

[0005] To achieve the above-mentioned purpose, the present invention proposes a safety protection device for a water turbine in a hydropower project, comprising a stator and a rotor arranged inside the stator, a protective cover, and an impeller assembly rotatably installed inside the protective cover; the impeller assembly comprises a rotating shaft, and blades evenly distributed in an annular shape on the outer cylindrical surface of the rotating shaft; the stator is installed at a position directly above the protective cover through a plurality of U-shaped support rods at intervals; the rotor is sleeved on the upper end of the rotating shaft; a containing assembly is installed at the lower end of the rotating shaft, an anti-corrosion assembly is arranged inside the containing assembly, and the anti-corrosion assembly comprises a zinc plate.

[0006] Preferably, a spirally descending guide groove is provided on the inner wall of the shield; the water inlet end of the guide groove extends from the upper end of the shield; and the water outlet end of the guide groove is located inside the shield and aligned with the blades.

[0007] Preferably, the containing component includes a hollow containing bin; the top of the containing bin is fixedly connected to the lower end of the rotating shaft; a plurality of upper water holes are opened on the conical wall of the upper part of the containing bin; a plurality of lower water holes are opened on the conical wall of the lower part of the containing bin, and the sum of the opening areas of all the upper water holes is greater than the sum of the opening areas of all the lower water holes.

[0008] Preferably, the anti-corrosion component further includes a plugging rod; a plurality of vertical slots are formed on the outer cylindrical surface of the plugging rod, and the plurality of slots are distributed in a circular array centered on the axis of the plugging rod; the cross-section of the slot is in the shape of a T-shaped groove; a T-shaped strip is integrally formed on one of the vertical sides of the zinc plate; the zinc plate is inserted into the slot of the plugging rod through the T-shaped strip; the containing component further includes a base, and the base is screwed into the threaded hole at the lower end of the containing bin; the upper end of the plugging rod is installed in the top wall of the containing bin through a bearing; the lower end of the plugging rod is installed on the base through a bearing.

[0009] Preferably, a knob is integrally formed on the lower end surface of the base.

[0010] Preferably, a support component is arranged inside the protective cover; the lower part of the containing bin is rotatably installed on the support component.

[0011] Preferably, the support component includes a support ring and a plurality of connecting rods evenly distributed in a ring on the outer peripheral surface of the support ring; one end of the connecting rod far away from the support ring is welded to the inner wall of the protective cover; an operation hole is arranged at the center of the support ring; an annular sunk groove is formed at the upper hole opening position of the operation hole; the lower part of the containing bin is installed in the annular sunk groove of the support ring through a bearing.

[0012] Preferably, a plurality of U-shaped support rods are distributed in a circular array centered on the axis of the protective cover; one end of the U-shaped support rod is connected to the outer peripheral surface of the protective cover, and the other end is connected to the stator; an alarm component is arranged on the top surface of the stator; an inductance component is installed on the U-shaped support rod; the inductance component is used to sense the vibration or deflection of the rotating shaft and generate an induced current to supply power to the alarm component.

[0013] Preferably, the alarm component includes a buzzer and an LED lamp.

[0014] Preferably, the inductance component includes a sheath, a magnet column and an L-shaped support rod; the vertical rod of the support rod is connected to the U-shaped support rod; a sleeve is arranged at the end of the horizontal rod of the support rod; retaining rings are integrally formed at both ends of the sheath; the sheath is installed inside the sleeve by an interference fit through the retaining rings at both ends; a coil is wound around the outside of the sheath; the magnet column is slidably inserted into the inner hole of the sheath; a push rod is connected to the end of the magnet column; the end of the push rod far away from the magnet column extends out of the sleeve and is connected to a push block; a spring is sleeved outside the push rod, one end of the spring abuts against the sleeve, and the other end abuts against the push block; the spring is always in a compressed energy storage state and pushes the push block to abut against the outer peripheral surface of the rotating shaft; the coil is electrically connected to the buzzer and the LED lamp.

[0015] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0016] (1) When the present invention is in use, the impeller assembly rotates under the action of the water flow, and then the rotating shaft drives the rotor to rotate, cutting the magnetic flux lines of the stator to generate electrical energy. When the water flows into the container assembly at the lower end of the rotating shaft, a primary battery is formed by utilizing the water flow and the zinc plate, and the zinc plate serves as an anode. The corrosion of the impeller assembly by corrosive substances in the water body is reduced by means of a sacrificial anode, thereby increasing the service life of the impeller assembly. Since the corrosion is reduced, the axis deviation of the rotating shaft can be reduced, and the structural wear and vibration caused by the deflection of the rotating shaft can be reduced.

[0017] (2) In the present invention, the rotating shaft is monitored in real time through the inductance component, buzzer and LED light. When the axis of the rotating shaft of the impeller component deflects or vibrates, the inductance component can sense the vibration or deflection of the rotating shaft and generate an induced current to power the buzzer and LED light in the alarm component, thereby giving an audible and visual alarm, thereby reminding personnel to perform maintenance as soon as possible.

[0018] (3) In the present invention, when the zinc plate needs to be replaced, the equipment is stopped, and the personnel use a wrench tool to clamp the knob and rotate the base. After the base is removed, the anti-corrosion component can be taken out, and then a new zinc plate is inserted into the slot of the plug-in rod through a T-bar to complete the zinc plate replacement operation. Then, the entire anti-corrosion component can be loaded into the containing component, thereby improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the three-dimensional structure of the safety protection device provided by the present invention;

[0021] Figure 2 This is a schematic diagram of the exploded structure of the safety protection device provided by the present invention;

[0022] Figure 3 It is a schematic diagram of the structure of the plug-in rod and the zinc plate in the present invention;

[0023] Figure 4 It is a schematic diagram of the explosion structure of the inductor component in the present invention;

[0024] Figure 5 A schematic cross-sectional structure diagram of the safety protection device provided by the present invention;

[0025] Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure at position A in the present invention;

[0026] Figure 7 Schematic diagram of the enlarged partial sectional structure at the position of the containing component in the present invention.

[0027] Explanation of the reference numerals in the attached drawings: 1. Shield; 2. Anticorrosion component; 201. Insertion rod; 202. Chute; 203. Zinc plate; 204. T-shaped strip; 3. Containing component; 301. Containing bin; 302. Upper water passing hole; 303. Lower water passing hole; 304. Base; 305. Knob; 4. Support component; 401. Connecting rod; 402. Support ring; 403. Annular sinking groove; 404. Operation hole; 5. Inductive component; 501. Pusher block; 502. Push rod; 503. Magnet column; 504. Sheath; 505. Coil; 506. Sleeve; 507. Support rod; 508. Spring; 509. Retaining ring; 6. Alarm component; 601. Buzzer; 602. LED lamp; 7. Blade; 8. Rotor; 9. U-shaped support rod; 10. Stator; 11. Rotating shaft; 12. Flow guiding groove. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0029] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the attached drawings). If this specific posture changes, the directional indications will also change accordingly. At the same time, for the convenience of description, the "outer end" refers to the end along the radial direction outward, and the "inner end" refers to the end along the radial direction inward.

[0030] In addition, the descriptions involving "first", "second", etc. in the present invention are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] Combined with Figures 1 to 7 As shown, a safety protection device for a hydraulic turbine in a hydropower project includes a stator 10 and a rotor 8 arranged inside the stator 10, and further includes a shield 1 and an impeller assembly rotatably installed inside the shield 1; the impeller assembly includes a rotating shaft 11 and blades 7 annularly and evenly distributed on the outer cylindrical surface of the rotating shaft 11; the stator 10 is installed at a position directly above the shield 1 at intervals through a plurality of U-shaped support rods 9; the rotor 8 is sleeved on the upper end of the rotating shaft 11; a containing assembly 3 is installed at the lower end of the rotating shaft 11, and an anti-corrosion assembly 2 is arranged inside the containing assembly 3, and the anti-corrosion assembly 2 includes a zinc plate 203.

[0032] Combined with Figure 1 and Figure 5 As shown, a spiral descending flow guiding groove 12 is arranged on the inner wall of the shield 1; the water inlet end of the flow guiding groove 12 extends out from the upper end of the shield 1; the water outlet end of the flow guiding groove 12 is located inside the shield 1 and is aligned with the blades 7. The flow guiding groove 12 is used to guide the water flow. The water flow enters from the water inlet end of the flow guiding groove 12, rushes out from the water outlet end of the flow guiding groove 12, and impacts on the blades 7, thereby driving the impeller assembly to rotate.

[0033] Combined with Figure 7 As shown, the containing assembly 3 includes a hollow containing chamber 301; the top end of the containing chamber 301 is fixedly connected to the lower end of the rotating shaft 11; a plurality of upper water passing holes 302 are opened on the conical wall of the upper part of the containing chamber 301; a plurality of lower water passing holes 303 are opened on the conical wall of the lower part of the containing chamber 301, and the total opening area of all the upper water passing holes 302 is greater than the total opening area of all the lower water passing holes 303.

[0034] Combined with Figure 2 , Figure 3 and Figure 7As shown, the anti-corrosion component 2 also includes a plug-in rod 201; a plurality of vertical slots 202 are provided on the outer cylindrical surface of the plug-in rod 201, and the plurality of slots 202 are distributed in a circular array with the axis of the plug-in rod 201 as the center; the cross-section of the slot 202 is a T-slot shape; a T-bar 204 is integrally formed on one of the vertical edges of the zinc plate 203; the zinc plate 203 is inserted into the slot 202 of the plug-in rod 201 through the T-bar 204; the container component 3 also includes a base 304, and the base 304 is screwed into the threaded hole at the lower end of the container bin 301; the upper end of the plug-in rod 201 is mounted in the top wall of the container bin 301 through a bearing; the lower end of the plug-in rod 201 is mounted on the base 304 through a bearing.

[0035] Furthermore, a knob 305 is integrally formed on the lower end surface of the base 304 , and an operator can use a wrench tool to clamp the knob 305 to rotate the base 304 .

[0036] Combination Figure 2 and Figure 5 As shown, a support assembly 4 is provided inside the shield 1; the lower part of the storage bin 301 is rotatably mounted on the support assembly 4. Specifically, the support assembly 4 includes a support ring 402, and a plurality of connecting rods 401 annularly and evenly distributed on the outer circumference of the support ring 402; one end of the connecting rod 401 away from the support ring 402 is welded to the inner wall of the shield 1; an operating hole 404 is provided at the center of the support ring 402; an annular sink 403 is provided at the upper end of the operating hole 404; the lower part of the storage bin 301 is mounted in the annular sink 403 of the support ring 402 through a bearing.

[0037] Combination Figure 1 ,as well as Figures 4 to 6As shown, multiple U-shaped support rods 9 are distributed in a circular array centered on the axis of the shield 1; one end of the U-shaped support rod 9 is connected to the outer peripheral surface of the shield 1, and the other end is connected to the stator 10; an alarm component 6 is arranged on the top surface of the stator 10; an inductance component 5 is installed on the U-shaped support rod 9; the inductance component 5 is used to sense the vibration or deflection of the rotating shaft 11 and generate an induced current for powering the alarm component 6. Specifically, the alarm component 6 includes a buzzer 601 and an LED lamp 602. The inductance component 5 includes a sheath 504, a magnet column 503, and an L-shaped support rod 507; the vertical rod of the support rod 507 is connected to the U-shaped support rod 9; a sleeve 506 is arranged at the end of the horizontal rod of the support rod 507; both ends of the sheath 504 are integrally formed with retaining rings 509; the sheath 504 is installed inside the sleeve 506 by an interference fit through the retaining rings 509 at both ends; a coil 505 is wound around the outside of the sheath 504; the magnet column 503 is slidably inserted into the inner hole of the sheath 504; a push rod 502 is connected to the end of the magnet column 503; the end of the push rod 502 away from the magnet column 503 extends out of the sleeve 506 and is connected to a push block 501; a spring 508 is sleeved outside the push rod 502, one end of the spring 508 abuts against the sleeve 506, and the other end abuts against the push block 501; the spring 508 is always in a compressed energy storage state and pushes the push block 501 to abut against the outer peripheral surface of the rotating shaft 11; the coil 505 is electrically connected to the buzzer 601 and the LED lamp 602.

[0038] When the device provided in this embodiment is in operation, water flows into the shield 1 through the diversion groove 12 and drives the impeller assembly to rotate under the action of the water flow, so that the rotating shaft 11 drives the rotor 8 to rotate, and the magnetic induction lines of the stator 10 are cut to generate electric energy. When water enters the storage bin 301 through the upper water holes 302, since the flow rate of the upper water holes 302 is greater than that of the lower water holes 303, the inner cavity of the storage bin 301 is always filled with water. After the device is used for a long time, metal components such as the blades 7, the rotating shaft 11, and the storage bin 301 are subjected to cavitation and the impact of corrosive substances and particulate matters in the water body, resulting in damage to the surfaces of the blades 7, the rotating shaft 11, and the storage bin 301, thereby aggravating the corrosion. The water body in the storage bin 301 submerges the zinc plate 203, so that the zinc plate 203, the water body, and the storage bin 301 form a primary battery, and the zinc plate 203 is gradually corroded by the corrosive substances in the water body to generate electrons. As the anode, the zinc plate 203 reduces the corrosion of the impeller assembly by the corrosive substances in the water body in the way of sacrificial anode, thereby achieving the anti-corrosion effect and improving the service life of the impeller assembly.

[0039] When the impeller assembly is subjected to cavitation and water flow impact for a long time, the blade 7 will deform, causing the center of gravity of the impeller assembly to shift during rotation, resulting in the vibration and deflection of the rotating shaft 11. When the rotating shaft 11 vibrates or deflects, the push block 501 and the push rod 502 are stressed, causing the magnet 503 to reciprocate in the sheath 504, so that the magnetic induction lines of the magnet 503 cut the coil 505, generating an induced current in the coil 505. The current will cause the buzzer 601 to emit a beeping alarm and the LED light 602 to flash. Since the blade 7 is subjected to continuous water flow impact, the rotating shaft 11 continues to rotate, and the magnet 503 moves back and forth continuously, causing the buzzer 601 and the LED light 602 to work continuously, to remind personnel that the equipment is damaged and needs maintenance.

[0040] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention, using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A safety protection device for a water turbine in a hydropower project, comprising a stator (10) and a rotor (8) arranged inside the stator (10), characterized in that: It also includes a protective cover (1) and an impeller assembly rotatably mounted inside the protective cover (1); The impeller assembly comprises a rotating shaft (11) and blades (7) evenly distributed in an annular manner on the outer cylindrical surface of the rotating shaft (11); The stator (10) is installed at a position just above the shield (1) via a plurality of U-shaped support rods (9) at intervals; the rotor (8) is sleeved on the upper end of the rotating shaft (11); A containing assembly (3) is installed at the lower end of the rotating shaft (11), and an anti-corrosion assembly (2) is arranged inside the containing assembly (3), wherein the anti-corrosion assembly (2) comprises a zinc plate (203).

2. A safety protection device for a water turbine in a hydropower project as claimed in claim 1, characterized in that: A spirally descending guide groove (12) is provided on the inner wall of the shield (1); a water inlet end of the guide groove (12) extends from the upper end of the shield (1); and a water outlet end of the guide groove (12) is located inside the shield (1) and is aligned with the blade (7).

3. A safety protection device for a water turbine in a hydropower project as claimed in claim 1, characterized in that: The container assembly (3) comprises a hollow container (301); the top end of the container (301) is fixedly connected to the lower end of the rotating shaft (11); A plurality of upper water holes (302) are provided on the conical wall at the upper part of the containing bin (301); A plurality of lower water holes (303) are provided on the conical wall at the lower part of the storage bin (301). The total opening area of ​​all the upper water holes (302) is greater than the total opening area of ​​all the lower water holes (303).

4. A safety protection device for a water turbine in a hydropower project as claimed in claim 3, characterized in that: The anti-corrosion component (2) further comprises a plug-in rod (201); a plurality of vertical slots (202) are provided on the outer cylindrical surface of the plug-in rod (201), and the plurality of slots (202) are distributed in a circular array with the axis of the plug-in rod (201) as the center; the cross section of the slot (202) is in the shape of a T-slot; A T-shaped bar (204) is integrally formed on one of the vertical sides of the zinc plate (203); the zinc plate (203) is inserted into the slot (202) of the plug-in rod (201) through the T-shaped bar (204); The container assembly (3) further comprises a base (304), and the base (304) is screwed into a threaded hole at the lower end of the container (301); the upper end of the plug-in rod (201) is mounted in the top wall of the container (301) via a bearing; and the lower end of the plug-in rod (201) is mounted on the base (304) via a bearing.

5. A safety protection device for a water turbine in a hydropower project as claimed in claim 4, characterized in that: A knob (305) is integrally formed on the lower end surface of the base (304).

6. A safety protection device for a water turbine in a hydropower project as claimed in claim 3, characterized in that: A support assembly (4) is arranged inside the protective cover (1); the lower part of the containing bin (301) is rotatably mounted on the support assembly (4).

7. A safety protection device for a water turbine in a hydropower project as claimed in claim 6, characterized in that: The support assembly (4) comprises a support ring (402) and a plurality of connecting rods (401) evenly distributed in an annular manner on the outer peripheral surface of the support ring (402); one end of the connecting rod (401) away from the support ring (402) is welded to the inner wall of the shield (1); An operating hole (404) is provided at the center of the support ring (402); an annular recess (403) is provided at the upper opening of the operating hole (404); and the lower part of the storage bin (301) is mounted in the annular recess (403) of the support ring (402) via a bearing.

8. A safety protection device for a water turbine in a hydropower project as claimed in claim 1, characterized in that: A plurality of U-shaped support rods (9) are distributed in a circular array with the axis of the shield (1) as the center; one end of the U-shaped support rod (9) is connected to the outer peripheral surface of the shield (1), and the other end is connected to the stator (10); An alarm component (6) is arranged on the top surface of the stator (10); An inductor component (5) is installed on the U-shaped support rod (9); the inductor component (5) is used to sense the vibration or deflection of the rotating shaft (11) and generate an induced current for supplying power to the alarm component (6).

9. A safety protection device for a water turbine in a hydropower project as claimed in claim 8, characterized in that: The alarm component (6) comprises a buzzer (601) and an LED light (602).

10. A safety protection device for a water turbine in a hydropower project as claimed in claim 9, characterized in that: The inductor assembly (5) comprises a sheath (504), a magnet column (503) and an L-shaped support rod (507); The vertical rod of the support rod (507) is connected to the U-shaped support rod (9); a sleeve (506) is provided at the end of the horizontal rod of the support rod (507); The two ends of the sheath (504) are integrally formed with retaining rings (509); the sheath (504) is installed inside the sleeve (506) by means of interference fit through the retaining rings (509) at the two ends; A coil (505) is wound around the outside of the sheath (504); The magnet column (503) is slidably inserted into the inner hole of the sleeve (504); a push rod (502) is connected to the end of the magnet column (503); one end of the push rod (502) away from the magnet column (503) extends out from the sleeve (506) and is connected to a push block (501); A spring (508) is sleeved on the outside of the push rod (502), one end of the spring (508) abuts against the sleeve (506), and the other end abuts against the push block (501); The spring (508) is always in a compressed energy storage state, and pushes the push block (501) to abut against the outer peripheral surface of the rotating shaft (11); The coil (505) is electrically connected to the buzzer (601) and the LED light (602).

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