Main shaft inner cavity water level monitoring device of hydraulic generator

Abstract

The utility model relates to the technical field of spindle inner cavity monitoring of a hydro-generator, and discloses a spindle inner cavity water level monitoring device of the hydro-generator. The main shaft inner cavity water level monitoring device of the hydro-generator comprises a main shaft, an air supplementing pipe, a bottom cover plate, a water throwing hole and a water leakage sensor, the inner wall of the main shaft is fixedly connected with a straight tooth sliding rail, and the outer side of the straight tooth sliding rail is slidably connected with a sliding block which is located on the left side of the straight tooth sliding rail and is close to the bottom cover plate; the device has the advantages that the water leakage sensor can be replaced without detaching the main shaft, and the problem that in the prior art, the water leakage sensor in the inner cavity of the main shaft is fixedly connected to the inner wall, close to the bottom cover plate, of the main shaft, and the water leakage sensor cannot be replaced is solved. And if the water leakage sensor needs to be replaced due to the problems of aging and the like, the main shaft needs to be disassembled and replaced, and the operation is very inconvenient.

Description

Technical Field

[0001] The utility model relates to the technical field of main shaft inner cavity monitoring of a hydro-turbine generator, in particular to a main shaft inner cavity water level monitoring device for a hydro-turbine generator. Background Art

[0002] Large hydroelectric generator sets consist of a turbine and a generator, with the turbine at the bottom and the generator at the top, and the two are connected by a main shaft for synchronous rotation. Due to the requirement of air supply to the turbine, some pipes are often set up in the center of the main shaft, the upper end of which is installed in the main shaft of the generator, and the lower end is connected to the turbine runner, and is connected to the downstream tail water through a sealing cover. When the main shaft rotates, the downstream water level (tail water) in the runner presents a negative pressure, which will not cause water leakage in the main shaft cavity. When the main shaft is stationary, the tail water in the runner presents a positive pressure. If the cover is not tightly sealed or damaged, it will cause water leakage in the main shaft cavity.

[0003] In the prior art, a water leakage sensor in the inner cavity of the main shaft is fixedly connected to the inner wall of the main shaft near the bottom cover plate, and then monitors whether water enters the inner cavity of the main shaft. If the water leakage sensor needs to be replaced due to aging or other problems, the main shaft needs to be removed for replacement, which is very inconvenient. Therefore, a water level monitoring device for the inner cavity of the main shaft of a hydro-turbine generator is proposed to solve the above problem. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a water level monitoring device for the inner cavity of the main shaft of a hydro-turbine generator, which has the advantages of being able to replace the water leakage sensor without removing the main shaft, etc., and solves the problem in the prior art that the water leakage sensor in the inner cavity of the main shaft is fixedly connected to the inner wall of the main shaft close to the bottom cover plate, and then monitors whether water has entered the inner cavity of the main shaft. If the water leakage sensor needs to be replaced due to aging or other problems, the main shaft needs to be removed for replacement, which is very inconvenient.

[0006] (II) Technical solution

[0007] The utility model solves the above-mentioned technical problem with the following technical solutions: a water level monitoring device for the main shaft cavity of a hydro-turbine generator, comprising a main shaft, an air supply pipe, a bottom cover plate, a water-throwing hole and a water leakage sensor, wherein the inner wall of the main shaft is fixedly connected with a spur-toothed slide rail, the outer side of the spur-toothed slide rail is slidably connected with a sliding block located on its left side and close to the bottom cover plate, the interior of the sliding block is provided with a lifting assembly that meshes with the front side of the spur-toothed slide rail and extends to its left side, the left side of the sliding block is fixedly connected with a mounting shell, the interior of the mounting shell is provided with a motor whose output end extends to its right side, the output end of the motor is fixedly connected with a first gear that meshes with the lifting assembly, the rear side of the mounting shell is fixedly connected with a bracket, the interior of the bracket is provided with an extension To the right side thereof and meshing with the first gear, the top of the sliding block is connected with a water leakage sensor through a thread, the inner wall of the main shaft is provided with an anti-tear-off component located above the water-throwing hole, the outer wall of the main shaft is provided with a power distribution component located above the water-throwing hole, the bottom of the power distribution component is provided with a control cable electrically connected thereto, the control cable passes through the water-throwing hole and the anti-tear-off component, one end of the control cable away from the power distribution component is wound to the outside of the winding assembly and is electrically connected to the winding assembly, the left side of the winding assembly is provided with a first cable and a second cable electrically connected thereto, the first cable and the second cable are electrically connected to the motor and the water leakage sensor respectively, and the power distribution component is electrically connected to a monitoring computer.

[0008] The beneficial effect of the utility model is as follows: when the water leakage sensor needs to be replaced, the signal is transmitted to the power distribution component through the monitoring computer, and then the motor is operated through the control cable and the first cable, and then the lifting component and the winding component are driven to move simultaneously through the first gear, and the lifting component is engaged with the spur rail, and the sliding block is driven to move along the spur rail toward the water-throwing hole until the worker can replace the water leakage sensor through the water-throwing hole, and then the motor stops working. During this process, the winding component winds the control cable to its outside, and the anti-tear component prevents the control cable from being broken by elastic deformation. When the sliding block moves to the vicinity of the straight water-throwing hole, the worker can reach in through the water-throwing hole to replace the water leakage sensor.

[0009] The main shaft inner cavity water level monitoring device of the hydro-turbine generator has the advantage that the water leakage sensor can be replaced without removing the main shaft.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the lifting assembly includes a first rotating shaft, a second gear and a third gear. The internal rotation of the sliding block is connected to the first rotating shaft extending to its left side. The right side of the first rotating shaft is fixedly connected to the second gear located inside the sliding block and meshing with the front side of the spur rail. The left side of the first rotating shaft is fixedly connected to the third gear meshing with the first gear.

[0012] The beneficial effect of adopting the above further scheme is that when the motor is working, the third gear is driven to rotate through the first gear, and then the second gear is driven to rotate through the first rotating shaft. The second gear engages with the front side of the spur rail, and then drives the sliding block to move upward along the spur rail to the vicinity of the water-throwing hole.

[0013] Further, the winding assembly includes a second rotating shaft, a fourth gear, a rotating roller and a conductive slip ring, the interior of the bracket is rotatably connected to the second rotating shaft extending to the right side thereof, the right side of the second rotating shaft is fixedly connected to the fourth gear meshing with the first gear, the left side of the second rotating shaft is fixedly connected to the rotating roller, the left side of the rotating roller is fixedly connected to the conductive slip ring extending to the right side of the bracket and fixedly connected to the bracket, the control cable is wound around the outside of the rotating roller and electrically connected to the conductive slip ring, the first cable and the second cable are both electrically connected to the conductive slip ring, the fourth gear has the same module and number of teeth as the third gear, and the diameter of the rotating roller is the same as the pitch circle diameter of the second gear;

[0014] Furthermore, the anti-tear-off component includes a cylindrical shell, a cylindrical connecting block and a spring. The inner wall of the main shaft is fixedly connected to the cylindrical shell located above the water-throwing hole. The control cable passes through the cylindrical shell. The inside of the cylindrical shell is slidably connected to a cylindrical connecting block fixedly connected to the outside of the control cable. The bottom of the cylindrical connecting block is fixedly connected to a spring fixedly connected to the cylindrical shell.

[0015] The beneficial effect of adopting the above further scheme is that the motor drives the first gear to rotate, and then drives the rotating roller to rotate through the fourth gear and the second rotating shaft, and the rotating roller winds the control cable to its outside. Since the fourth gear and the third gear have the same module and number of teeth, the fourth gear and the third gear rotate synchronously. Since the diameter of the rotating roller is the same as the pitch circle diameter of the second gear, the height to which the sliding block rises when the second gear rotates one circle is similar to the length of the control cable wound by the rotating roller when it rotates one circle. When the control cable is tightened, the control cable is prevented from being broken, and the spring begins to undergo elastic deformation to reduce the tension on the control cable. Therefore, during the upward movement of the sliding block, the excess control cable can be wound to the outside of the rotating roller.

[0016] Furthermore, the power distribution assembly includes a distribution box, a battery and a wireless transmission module. The outer wall of the main shaft is fixedly connected to the distribution box located above the water-throwing hole. The distribution box is provided with a battery and a wireless transmission module. The battery and the wireless transmission module are electrically connected to the control cable, and the wireless transmission module is electrically connected to the monitoring computer.

[0017] The beneficial effect of adopting the above further scheme is that the signal can be transmitted to the wireless transmission module through the monitoring computer, and then the motor is operated through the control cable and the first cable. The water leakage sensor can also transmit the monitored situation to the wireless transmission module through the second cable and the control cable, and then transmit it to the monitoring computer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 It is an enlarged schematic diagram of the structure at a of the utility model;

[0020] Figure 3 This is an enlarged schematic diagram of the structure at b of the utility model;

[0021] Figure 4 This is a top view of the main shaft of the utility model;

[0022] Figure 5 It is an enlarged schematic diagram of the structure at c of the utility model.

[0023] In the figure: 1. main shaft; 2. air supply pipe; 3. bottom cover plate; 4. water-shedding hole; 5. water leakage sensor; 6. spur rail; 7. sliding block; 8. lifting assembly; 801. first rotating shaft; 802. second gear; 803. third gear; 9. mounting shell; 10. motor; 11. first gear; 12. bracket; 13. winding assembly; 131. second rotating shaft; 132. fourth gear; 133. rotating roller; 134. conductive slip ring; 14. anti-tear assembly; 141. columnar shell; 142. columnar connecting block; 143. spring; 15. power distribution assembly; 151. power distribution box; 152. battery; 153. wireless transmitting module; 16. control cable; 17. first cable; 18. second cable. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the embodiment, Figure 1-5A water level monitoring device for the inner cavity of the main shaft of a hydro-turbine generator is provided. The utility model comprises a main shaft 1, an air supply pipe 2, a bottom cover plate 3, a water-throwing hole 4 and a water leakage sensor 5. The inner wall of the main shaft 1 is fixedly connected with a spur rail 6, and the outer side of the spur rail 6 is slidably connected with a sliding block 7 located on the left side and close to the bottom cover plate 3. The interior of the sliding block 7 is provided with a lifting assembly 8 that meshes with the front side of the spur rail 6 and extends to the left side thereof. The left side of the sliding block 7 is fixedly connected with a mounting shell 9, and the interior of the mounting shell 9 is provided with a motor 10 whose output end extends to the right side thereof, and the output end of the motor 10 is fixedly connected with a first gear 11 that meshes with the lifting assembly 8. The rear side of the mounting shell 9 is fixedly connected with a bracket 12, and the interior of the bracket 12 is provided with a A winding assembly 13, the top of the sliding block 7 is connected with a water leakage sensor 5 by a thread, the inner wall of the main shaft 1 is provided with an anti-tear-off assembly 14 located above the water-throwing hole 4, the outer wall of the main shaft 1 is provided with a power distribution assembly 15 located above the water-throwing hole 4, the bottom of the power distribution assembly 15 is provided with a control cable 16 electrically connected thereto, the control cable 16 passes through the water-throwing hole 4 and the anti-tear-off assembly 14, one end of the control cable 16 away from the power distribution assembly 15 is wound to the outside of the winding assembly 13 and is electrically connected to the winding assembly 13, the left side of the winding assembly 13 is provided with a first cable 17 and a second cable 18 electrically connected thereto, the first cable 17 and the second cable 18 are electrically connected to the motor 10 and the water leakage sensor 5 respectively, and the power distribution assembly 15 is electrically connected to the monitoring computer;

[0026] The lifting assembly 8 includes a first rotating shaft 801, a second gear 802 and a third gear 803. The first rotating shaft 801 extending to the left side of the sliding block 7 is rotatably connected inside the sliding block 7. The second gear 802 located inside the sliding block 7 and meshing with the front side of the spur rail 6 is fixedly connected to the right side of the first rotating shaft 801. The third gear 803 meshing with the first gear 11 is fixedly connected to the left side of the first rotating shaft 801.

[0027] When the motor 10 is working, the third gear 803 is driven to rotate through the first gear 11, and the second gear 802 is driven to rotate through the first rotating shaft 801. The second gear 802 is meshed with the front side of the spur-toothed guide rail 6, and the sliding block 7 is driven to move upward along the spur-toothed guide rail 6 to the vicinity of the water-shedding hole 4.

[0028] The winding assembly 13 includes a second rotating shaft 131, a fourth gear 132, a rotating roller 133 and a conductive slip ring 134. The bracket 12 is internally rotatably connected with the second rotating shaft 131 extending to the right side thereof, the right side of the second rotating shaft 131 is fixedly connected with the fourth gear 132 meshing with the first gear 11, the left side of the second rotating shaft 131 is fixedly connected with the rotating roller 133, the left side of the rotating roller 133 is fixedly connected with the conductive slip ring 134 extending to the right side of the bracket 12 and fixedly connected to the bracket 12, the control cable 16 is wound around the outer side of the rotating roller 133 and is electrically connected to the conductive slip ring 134, the first cable 17 and the second cable 18 are both electrically connected to the conductive slip ring 134, the fourth gear 132 has the same module and number of teeth as the third gear 803, and the diameter of the rotating roller 133 is the same as the pitch circle diameter of the second gear 802;

[0029] The anti-tear assembly 14 includes a columnar shell 141, a columnar connecting block 142 and a spring 143. The inner wall of the main shaft 1 is fixedly connected with the columnar shell 141 located above the water-throwing hole 4. The control cable 16 passes through the columnar shell 141. The inside of the columnar shell 141 is slidably connected with the columnar connecting block 142 fixedly connected to the outside of the control cable 16. The bottom of the columnar connecting block 142 is fixedly connected with the spring 143 fixedly connected to the columnar shell 141.

[0030] The motor 10 drives the first gear 11 to rotate, and then drives the rotating roller 133 to rotate through the fourth gear 132 and the second rotating shaft 131. The rotating roller 133 winds the control cable 16 to its outside. Since the fourth gear 132 has the same module and number of teeth as the third gear 803, the fourth gear 132 and the third gear 803 rotate synchronously. Since the diameter of the rotating roller 133 is the same as the pitch circle diameter of the second gear 802, the height to which the sliding block 7 rises when the second gear 802 rotates one circle is similar to the length of the control cable 16 wound when the rotating roller 133 rotates one circle. When the control cable 16 is tightened, the spring 143 starts to undergo elastic deformation to prevent the control cable 16 from being broken, thereby reducing the tension on the control cable 16. Thus, during the upward movement of the sliding block 7, the excess control cable 16 can be wound to the outside of the rotating roller 133.

[0031] The power distribution assembly 15 includes a power distribution box 151, a battery 152 and a wireless transmission module 153. The outer wall of the main shaft 1 is fixedly connected with the power distribution box 151 located above the water-throwing hole 4. The power distribution box 151 is provided with a battery 152 and a wireless transmission module 153 inside. The battery 152 and the wireless transmission module 153 are both electrically connected to the control cable 16, and the wireless transmission module 153 is electrically connected to the monitoring computer.

[0032] The signal can be transmitted to the wireless transmission module 153 through the monitoring computer, and then the motor 10 is operated through the control cable 16 and the first cable 17. The water leakage sensor 5 can also transmit the monitored situation to the wireless transmission module 153 through the second cable 18 and the control cable 16, and then transmit it to the monitoring computer.

[0033] Working principle:

[0034] Step 1: When the water leakage sensor 5 needs to be replaced, the monitoring computer transmits a signal to the wireless transmitting module 153, and then the motor 10 is operated through the control cable 16 and the first cable 17. When the motor 10 is operating, the third gear 803 is driven to rotate through the first gear 11, and then the second gear 802 is driven to rotate through the first rotating shaft 801. The second gear 802 is meshed with the front side of the spur-toothed slide rail 6, and then the sliding block 7 is driven to move upward along the spur-toothed slide rail 6 to the vicinity of the water-throwing hole 4;

[0035] Step 2: In the above process, the motor 10 drives the first gear 11 to rotate, and then drives the rotating roller 133 to rotate through the fourth gear 132 and the second rotating shaft 131, and the rotating roller 133 winds the control cable 16 to its outside. Since the fourth gear 132 has the same module and number of teeth as the third gear 803, the fourth gear 132 and the third gear 803 rotate synchronously. Since the diameter of the rotating roller 133 is the same as the pitch circle diameter of the second gear 802, the height to which the sliding block 7 rises when the second gear 802 rotates one circle is similar to the length of the control cable 16 wound when the rotating roller 133 rotates one circle, and when the control cable 16 is tightened, the spring 143 begins to undergo elastic deformation to prevent the control cable 16 from being broken, thereby reducing the tension on the control cable 16. Therefore, during the upward movement of the sliding block 7, the excess control cable 16 can be wound to the outside of the rotating roller 133.

[0036] Step 3: When the sliding block 7 moves to the vicinity of the direct water-spraying hole 4, the worker can reach in through the direct water-spraying hole 4 to replace the water leakage sensor 5.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for monitoring the water level in the inner cavity of the main shaft of a hydro-turbine generator, comprising a main shaft (1), an air supply pipe (2), a bottom cover plate (3), a water-throwing hole (4) and a water leakage sensor (5), characterized in that: The inner wall of the main shaft (1) is fixedly connected with a spur-toothed slide rail (6), and the outer side of the spur-toothed slide rail (6) is slidably connected with a sliding block (7) located on the left side thereof and close to the bottom cover plate (3). The interior of the sliding block (7) is provided with a lifting assembly (8) meshing with the front side of the spur-toothed slide rail (6) and extending to the left side thereof. The left side of the sliding block (7) is fixedly connected with a mounting shell (9), and the interior of the mounting shell (9) is provided with a motor (10) with an output end extending to the right side thereof. The output end of the motor (10) is fixedly connected with a first gear (11) meshing with the lifting assembly (8). The rear side of the mounting shell (9) is fixedly connected with a bracket (12), and the interior of the bracket (12) is provided with a winding assembly (13) extending to the right side thereof and meshing with the first gear (11). The top of the sliding block (7) is connected with a water leakage sensor (5) via a thread. The inner wall of the main shaft (1) is provided with an anti-tear component (14) located above the water-throwing hole (4), the outer wall of the main shaft (1) is provided with a power distribution component (15) located above the water-throwing hole (4), the bottom of the power distribution component (15) is provided with a control cable (16) electrically connected thereto, the control cable (16) passes through the water-throwing hole (4) and the anti-tear component (14), one end of the control cable (16) away from the power distribution component (15) is wound around the outside of the winding component (13) and is electrically connected to the winding component (13), the left side of the winding component (13) is provided with a first cable (17) and a second cable (18) electrically connected thereto, the first cable (17) and the second cable (18) are electrically connected to the motor (10) and the water leakage sensor (5) respectively, and the power distribution component (15) is electrically connected to a monitoring computer.

2. The device for monitoring the water level in the main shaft cavity of a hydro-generator according to claim 1, characterized in that: The lifting assembly (8) comprises a first rotating shaft (801), a second gear (802) and a third gear (803); the interior of the sliding block (7) is rotatably connected to the first rotating shaft (801) extending to the left side thereof; the right side of the first rotating shaft (801) is fixedly connected to the second gear (802) located inside the sliding block (7) and meshing with the front side of the spur gear guide rail (6); the left side of the first rotating shaft (801) is fixedly connected to the third gear (803) meshing with the first gear (11).

3. The device for monitoring the water level in the main shaft cavity of a hydro-generator according to claim 2, characterized in that: The winding assembly (13) comprises a second rotating shaft (131), a fourth gear (132), a rotating roller (133) and a conductive slip ring (134); the interior of the bracket (12) is rotatably connected to the second rotating shaft (131) extending to the right side thereof; the right side of the second rotating shaft (131) is fixedly connected to the fourth gear (132) meshing with the first gear (11); the left side of the second rotating shaft (131) is fixedly connected to the rotating roller (133); the left side of the rotating roller (133) is fixedly connected to the A conductive slip ring (134) extends to the right side of the bracket (12) and is fixedly connected to the bracket (12); the control cable (16) is wound around the outside of the rotating roller (133) and is electrically connected to the conductive slip ring (134); the first cable (17) and the second cable (18) are both electrically connected to the conductive slip ring (134); the fourth gear (132) and the third gear (803) have the same module and number of teeth; and the diameter of the rotating roller (133) is the same as the pitch circle diameter of the second gear (802).

4. The main shaft inner cavity water level monitoring device of a hydro-generator according to claim 1, characterized in that: The anti-tear component (14) comprises a columnar shell (141), a columnar connecting block (142) and a spring (143); the inner wall of the main shaft (1) is fixedly connected to the columnar shell (141) located above the water-shedding hole (4); the control cable (16) passes through the columnar shell (141); the interior of the columnar shell (141) is slidably connected to the columnar connecting block (142) fixedly connected to the outside of the control cable (16); the bottom of the columnar connecting block (142) is fixedly connected to the spring (143) fixedly connected to the columnar shell (141).

5. The device for monitoring the water level in the main shaft cavity of a hydro-generator according to claim 1, characterized in that: The power distribution assembly (15) comprises a power distribution box (151), a storage battery (152) and a wireless transmission module (153); the outer wall of the main shaft (1) is fixedly connected to the power distribution box (151) located above the water-shedding hole (4); the power distribution box (151) is provided with a storage battery (152) and a wireless transmission module (153); the storage battery (152) and the wireless transmission module (153) are both electrically connected to a control cable (16); and the wireless transmission module (153) is electrically connected to a monitoring computer.

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