Hydraulic turbine main shaft seal main and standby water source switching control system

Abstract

The utility model is specifically related to a water turbine main shaft seal main and standby water source switching control system, belongs to the water turbine main shaft seal water source switching technical field. The system is applied to the water turbine main shaft seal, the system includes flow detection component, pressure transmission component and wire assembly. Flow detection component is arranged in main water source channel and standby water source channel respectively, pressure transmission component is arranged in main water source channel and standby water source channel respectively, wire assembly is arranged in pressure transmission component, and wire assembly is used for making the cable of pressure transmission component along the specified direction laying. When the flow data and pressure data of main water source channel all reduce to threshold value, can pass through the processor control main water source channel's electric control valve and close, and the electric control valve of standby water source channel opens.

Description

Technical Field

[0001] This utility model belongs to the technical field of water source switching for turbine main shaft seal, specifically relating to a main and backup water source switching control system for turbine main shaft seal. Background Technology

[0002] The turbine main shaft seal is a sealing device located at the separation point between the rotating main shaft and the stationary support cover of the turbine, and is one of the key components of a hydro-generator unit. To ensure the safe and stable operation of the unit, it is necessary to install a backup water source at the main shaft seal. When the flow of the main water source is insufficient, it switches to the backup water source to ensure the normal operation of the unit. However, how to automatically switch between the active and backup water sources is a problem that needs to be solved. Utility Model Content

[0003] The purpose of this invention is to provide a main and backup water source switching control system for the turbine main shaft seal, which can automatically switch between the main water source and the backup water source.

[0004] To achieve the aforementioned objectives, the technical solution adopted by this utility model is as follows: This application provides a main and backup water source switching control system for a turbine main shaft seal, applied to the turbine main shaft seal. The system includes a flow detection component, a pressure transmitter component, and a cable assembly. The flow detection component is respectively installed in the main water source channel and the backup water source channel; the pressure transmitter component is also respectively installed in the main water source channel and the backup water source channel; the cable assembly is installed in the pressure transmitter component, and the cable assembly is used to lay the cable of the pressure transmitter component along a specified direction.

[0005] In some embodiments, the lead assembly includes a ball head seat and a ball head component. The ball head seat is connected to the pressure transmitter component and has a spherical cavity and a first through hole communicating with the spherical cavity. The ball head component is housed in the spherical cavity and has a second through hole, with the first and second through holes disposed opposite to each other.

[0006] In some embodiments, the ball joint component includes a main body, an elastic support portion, a clamping portion, a support portion, and a pushing portion. A second through hole is provided in the main body, and the main body is inserted into a spherical cavity. Around the second through hole, the main body is provided with a plurality of guide holes. The inlet end of the guide holes is located on the side of the main body away from the spherical cavity, and the outlet end of the guide holes is located on the side of the main body inserted into the spherical cavity. The elastic support portion is provided corresponding to the guide holes. The elastic support portion includes a bending section and a moving section. The moving section passes through the guide holes, and one side of the bending section is connected to one end of the moving section located in the spherical cavity. The bending section bends towards the inlet of the spherical cavity. The clamping portion is movably disposed in the main body along the axial direction of the second through hole. The support portion is connected to the main body, and the clamping portion is located above the support portion. The clamping portion and the support portion cooperate to clamp the other side of the bending section. The pushing portion is movably disposed in the main body along the axial direction of the second through hole and is used to abut against the side of the moving section away from the spherical cavity.

[0007] In some embodiments, the main body is provided with a guide rod, the pushing part is provided with a guide hole, and the guide rod passes through the guide hole.

[0008] In some embodiments, the diameter of the guide hole gradually decreases from the inlet section to the middle of the guide hole, and the guide hole is inclined in a direction gradually away from the second through hole from the side of the main body away from the spherical cavity to the side of the main body inserted into the spherical cavity. The ball head component also includes a rotating part and a moving part. The rotating part is rotatably disposed on the pushing part, the rotation axis of the rotating part is perpendicular to the axial direction of the second through hole, the side of the rotating part away from the second through hole is bent, the moving part abuts against the bend of the rotating part, and the elastic support part has a protrusion on the side away from the second through hole. The moving part is movably connected to the pushing part along the axial direction of the second through hole, and an elastic element is disposed between the moving part and the pushing part.

[0009] In some embodiments, a flexible contact portion is provided on the side of the elastic support portion near the second through hole.

[0010] In some embodiments, a separation notch is provided on the side of the curved section away from the moving section, the separation notch dividing the side of the curved section away from the moving section into two segments, the curved section including a second side facing the support, the curved section being provided with an elastic separation part, the elastic separation part being bent, and the two ends of the elastic separation part being connected to the second sides of the two segments respectively.

[0011] In some embodiments, the elastic separation portion is bent to form two parts, each part being a concave shape with its side facing away from the second side.

[0012] In some embodiments, the side of the curved section facing the spherical cavity is a convex arc surface.

[0013] In some embodiments, the end of the second through hole opposite to the first through hole is a frustum-shaped cone with the larger end facing the spherical cavity inlet.

[0014] This utility model has the following beneficial effects:

[0015] 1. When the flow rate and pressure data of the main water source channel both drop to the threshold, the processor can control the electrical control valve of the main water source channel to close and the electrical control valve of the backup water source channel to open.

[0016] 2. By using both flow detection and pressure transmitter components to control the electrically controlled valve, the reliability of detection can be increased, reducing the risk of miscontrol due to measurement errors. Furthermore, it can be used to determine the type of fault. For example, when the channel is blocked, the flow detection data will change significantly, while the pressure transmitter data will not change significantly due to water pressure. This allows for the determination of the fault type. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main and backup water source switching control system for the turbine main shaft seal of this utility model;

[0018] Figure 2 This is a schematic diagram of the wire assembly of this utility model;

[0019] Figure 3 for Figure 2 Enlarged view of point A;

[0020] Figure 4 This is a schematic diagram of the structure of the curved section of this utility model;

[0021] Figure 5 This is a schematic diagram of the clamping part of this utility model;

[0022] Figure 6 This is a schematic diagram showing the cooperation between the curved section and the clamping part of this utility model.

[0023] Reference numerals: 1-Main water source channel, 2-Backup water source channel, 3-Flow detection component, 4-Pressure transmitter component, 5-Water turbine, 6-Clamp, 7-Ball head seat, 8-Ball head component, 9-Spherical cavity, 10-Elastic support part, 11-Bending section, 12-Moving section, 13-Support part, 14-Clamping part, 15-Pushing part, 16-Guide hole, 17-Second through hole, 18-First through hole, 19-Cable, 20-Protrusion, 21-Flexible contact part, 22-Rotating part, 23-Moving part, 24-Elastic element, 25-Main body, 26-Separation notch, 27-Elastic separation part, 28-Segmentation, 29-Guide groove, 30-Electrically controlled valve. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Unless otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art.

[0025] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] This application provides a main shaft seal main and backup water source switching control system for a water turbine 5, including a flow detection component 3, a pressure transmitter 4, and a wire assembly. The flow detection component 3 is respectively installed in the main water source channel 1 and the backup water source channel 2, the pressure transmitter 4 is respectively installed in the main water source channel 1 and the backup water source channel 2, and the wire assembly is installed in the pressure transmitter 4. The wire assembly is used to lay the cable 19 of the pressure transmitter 4 in a specified direction.

[0027] The main water source channel 1 and the backup water source channel 2 are used to transport the medium to the main shaft of the turbine 5.

[0028] The flow detection component 3 is used to detect the flow rate of the medium in the corresponding pipeline. For example, the flow detection component 3 can be a flow meter.

[0029] The pressure transmitter 4 is used to detect the pressure of the medium in the corresponding pipeline. For example, the pressure transmitter 4 can be a pressure transmitter. The internal structure, usage method and detection principle of the flow detection component 3 and the pressure transmitter 4 are well known to those skilled in the art and will not be described in detail here.

[0030] The main water source channel 1 and the backup water source channel 2 can each be equipped with an electrically controlled valve 30. The flow detection component 3, the pressure transmitter component 4, and the electrically controlled valve 30 can be electrically connected to the processor. The processor controls the electrically controlled valve 30 based on the data detected by the flow detection component 3 and the pressure transmitter component 4, thereby switching between the main water source channel 1 and the backup water source channel 2. For example, when both the flow rate and pressure data of the main water source channel 1 decrease to a threshold, the processor can control the electrically controlled valve 30 of the main water source channel 1 to close and the electrically controlled valve 30 of the backup water source channel 2 to open.

[0031] It should be noted that the specific circuit, programming code, and control principle of the processor controlling the operation of the electrically controlled valve 30 according to the flow detection component 3 and the pressure transmitter component 4 are well known to those skilled in the art. The improvements in this application do not involve this aspect, and therefore will not be described in detail.

[0032] By using the flow detection component 3 and the pressure transmitter component 4 to jointly control the electrically controlled valve 30, two advantages are achieved. First, it increases the reliability of detection. For example, if the electrically controlled valve 30 is controlled solely by the pressure transmitter, errors may occur due to water hammer or other external factors. However, by using both the flow detection component 3 and the pressure transmitter component 4, the risk of miscontrol due to measurement errors can be reduced. Second, it can be used to determine the type of fault. For instance, when the channel is blocked, the measurement data of the flow detection component 3 will change significantly, while the measurement data of the pressure transmitter component 4 will not change significantly due to water pressure. This allows for the determination of the fault type.

[0033] like Figure 1 As shown, the project incorporating the concept of this application has been implemented at the Jinsha Hydropower Station. During the implementation of the project, the inventors further discovered that, in order to facilitate wiring and avoid obstacles in the channel, the cable 19 needs to be supported so that it extends in a designated direction. The current solution is to wrap the cable 19 with tape, which provides protection and allows multiple strands of the cable 19 to converge and extend in the designated direction on its own. The inventors found that the supporting effect of the tape is limited, and the cable 19 is prone to swaying, increasing the risk of wear or breakage.

[0034] By guiding the cable 19 of the pressure transmitter through the wire assembly, it is easier to connect the cable 19, and on the other hand, it can reduce the risk of cable 19 wear or breakage, improve the connection reliability between cable 19 and pressure transmitter, and reduce the risk of cable 19 breaking when pressure transmitter shakes.

[0035] In some embodiments, the lead assembly includes a ball head seat 7 and a ball head component 8. The ball head seat 7 is connected to the pressure transmitter component 4, and the ball head seat 7 is provided with a spherical cavity 9 and a first through hole 18 communicating with the spherical cavity 9. The ball head component 8 is accommodated in the spherical cavity 9 and is provided with a second through hole 17, with the first through hole 18 and the second through hole 17 disposed opposite to each other.

[0036] The ball head component 8 is housed in the spherical cavity 9, allowing the ball head component 8 to rotate within the spherical cavity 9.

[0037] The first through hole 18 and the second through hole 17 are used to pass through the cable 19. For example, after the cable 19 is connected to the pressure transmitter 4, it can pass through the first through hole 18 and the second through hole 17 in sequence. When the ball head component 8 rotates relative to the spherical cavity 9, the orientation of the cable 19 can be adjusted.

[0038] The connection method between the ball head seat 7 and the pressure transmitter can be selected from existing methods, for example, it can be connected by bolts or by clamps 6.

[0039] In some embodiments, the ball head component 8 includes a main body 25, an elastic support portion 10, a clamping portion 14, a support portion 13, and a pushing portion 15. A second through hole 17 is provided in the main body 25, and the main body 25 is inserted into the spherical cavity 9. Around the second through hole 17, the main body 25 is provided with a plurality of guide holes 16. The inlet end of the guide hole 16 is provided on the side of the main body 25 away from the spherical cavity 9, and the outlet end of the guide hole 16 is provided on the side of the main body 25 inserted into the spherical cavity 9. The elastic support portion 10 is provided corresponding to the guide hole 16. The elastic support portion 10 includes a bending section 11 and a moving section 12. The moving section 12 passes through the guide hole 16. One side of the bending section 11 is connected to one end of the moving section 12 disposed in the spherical cavity 9. The bending section 11 bends towards the inlet of the spherical cavity 9. The clamping part 14 is movably disposed on the main body 25 along the axial direction of the second through hole 17. The support part 13 is connected to the main body 25, and the clamping part 14 is disposed above the support part 13. The clamping part 14 and the support part 13 cooperate to clamp the other side of the bent section 11. The pushing part 15 is movably disposed on the main body 25 along the axial direction of the second through hole 17 and is used to abut against the side of the moving section 12 away from the spherical cavity 9.

[0040] One end of the main body 25 into the spherical cavity 9 can abut against the inner wall of the spherical cavity 9.

[0041] The elastic support portion 10 includes an elastic material, which allows the elastic support portion 10 to undergo elastic deformation.

[0042] The curved sections 11 of the multiple elastic support parts 10 form a ball-shaped structure, which allows the structure formed by the main body 25 and the curved sections 11 to rotate relative to the spherical cavity 9.

[0043] The movable segment 12 is inserted into the guide hole 16 so that when the curved segment 11 is accommodated in the spherical cavity 9, the movable segment 12 can be moved, and the position of the curved segment 11 in the spherical cavity 9 and the length of the curved segment 11 in contact with the inner wall of the spherical cavity 9 can be adjusted.

[0044] The structure in which the clamping part 14 is movable relative to the main body 25 can be selected from existing structures, and the main body 25 can be provided with a locking component to lock or unlock the clamping part 14.

[0045] The side of the curved section 11 away from the moving section 12 is disposed between the clamping part 14 and the supporting part 13. On the one hand, the curved section 11 can be limited by the clamping part 14 and the supporting part 13. On the other hand, referring to the structure shown in the figure, the curved section 11 is curved from bottom to top and inserted between the clamping part 14 and the supporting part 13. When the clamping part 14 and the supporting part 13 gradually close and clamp the curved section 11, the degree to which the curved section 11 protrudes from the main body 25 will gradually increase. This causes the friction between the curved section 11 and the spherical cavity 9 to gradually increase. That is, by adjusting the distance between the supporting part 13 and the clamping part 14, the friction between the ball head component 8 and the ball head seat 7 can be adjusted.

[0046] Furthermore, compared to the traditional integral ball head structure, the multiple curved sections 11 and the main body 25 work together with the spherical cavity 9, which has the advantage of being lightweight, thereby reducing the amplitude of the pressure transmitter 4 shaking when the medium flows in the channel and vibrates.

[0047] Furthermore, when the support part 13 and the clamping part 14 are separated, the side of the bending section 11 away from the moving section 12 can move significantly. The bending section 11 is easy to deform, which makes it easy for the bending section 11 to close, thereby allowing the main body 25 to be removed from the spherical cavity 9, which has the advantage of convenient assembly and disassembly.

[0048] The pushing part 15 is used to push the moving section 12 to move. By adjusting the position of the moving section 12, the overall structural shape of the curved section 11 can be adjusted. Specifically, when the side of the curved section 11 away from the moving section 12 is clamped, the moving section 12 is pushed into the spherical cavity 9. At this time, the degree of curvature of the curved section 11 will change, so that the curved section 11 can better fit the spherical cavity 9. This reduces the manufacturing precision requirements of the spherical cavity 9 and makes the ball head component 8 applicable to spherical cavities 9 with different inner diameters. Furthermore, when the clamping part 14 and the supporting part 13 are not clamping the curved section 11, the position of the end of the curved section 11 between the clamping part 14 and the supporting part 13 can be adjusted by moving the moving section 12. In this way, when the clamping part 14 and the supporting part 13 are closed, the degree of deformation of the curved section 11 will change, so that the friction between the ball head component 8 and the spherical cavity 9 can be adjusted within a wider range.

[0049] In some embodiments, the main body 25 is provided with a guide rod, the push part 15 is provided with a guide hole, and the guide rod passes through the guide hole.

[0050] The guide rod passes through the guide hole, allowing the push part 15 to be movably connected to the main body 25.

[0051] The main body 25 may be equipped with a limit component, which can unlock or lock the push part 15. The locking component can be selected from the existing structure, which will not be described in detail here.

[0052] In some embodiments, the diameter of the guide hole 16 gradually decreases from the inlet section to the middle of the guide hole 16, and from the side of the main body 25 away from the spherical cavity 9 to the side of the main body 25 inserted into the spherical cavity 9, the guide hole 16 is inclined in a direction gradually away from the second through hole 17. The ball head component 8 also includes a rotating part 22 and a moving part 23. The rotating part 22 is rotatably disposed on the pushing part 15, and the rotation axis of the rotating part 22 is perpendicular to the axial direction of the second through hole 17. The side of the rotating part 22 away from the second through hole 17 is bent, and the moving part 12 abuts against the bend of the rotating part 22. The elastic support part 10 is provided with a protrusion 20 on the side away from the second through hole 17. The moving part 23 is movably connected to the pushing part 15 along the axial direction of the second through hole 17, and an elastic member 24 is provided between the moving part 23 and the pushing part 15.

[0053] The diameter of the guide hole 16 gradually decreases, allowing the end of the elastic support part 10 away from the spherical cavity 9 to move within the range limited by the hole wall.

[0054] The guide hole 16 gradually tilts, which on the one hand allows the distance between the curved section 11 and the inner wall of the spherical cavity 9 to be adjusted when the moving section 12 moves, and on the other hand allows the friction between the curved section 11 and the spherical cavity 9 to be adjusted by moving the moving section 12. Furthermore, by adjusting the position of the curved section 11 relative to the spherical cavity 9, the curved section 11 can better fit with the inner wall of the spherical cavity 9, thereby improving the fitting accuracy between the ball head component 8 and the spherical cavity 9.

[0055] The rotating part 22 is bent on the side away from the second through hole 17, so that the side of the rotating part 22 away from the second through hole 17 can limit the moving section 12. In the initial state, the bent side of the rotating part 22 is away from the main body 25, and the other side is close to the main body 25. Since the part of the moving section 12 outside the main body 25 is longer at this time, under the limitation of the rotating part 22, the moving section 12 is away from the guide hole 16 and close to the inner wall of the second through hole 17. At this time, the part of the moving section 12 outside the main body 25 is close to vertical. This can reduce the risk of the part of the moving section 12 outside the main body 25 bending when the pushing part 15 pushes the moving section 12 to move.

[0056] The protrusion 20 reduces the risk of the moving segment 12 bending under the action of the pushing part 15. Furthermore, when the moving segment 12 moves to a point where the protrusion 20 abuts against the inner wall of the guide hole 16, it swings towards the inner wall of the guide hole 16 and the second through hole 17 under the action of the protrusion 20. Since the portion of the moving segment 12 outside the main body 25 is shorter at this point, it will not bend when the pushing part 15 pushes it. This design increases the overall tilt angle of the moving segment 12, facilitating its movement along the tilt direction of the guide hole 16. Additionally, the proximity of the moving segment 12 to the inner wall of the guide hole 16 and the second through hole 17 allows multiple moving segments 12 to clamp the cable 19 and push it a certain distance into the spherical cavity 9. This protects and secures the cable 19, reducing the risk of it breaking due to being pulled when the main body 25 rotates. Specifically, if the cable 19 is taut, it will be under tension when the main body 25 rotates. By leaving a certain amount of slack in the second through hole 17, the risk of the cable 19 breaking due to tension when the main body 25 rotates can be reduced. Furthermore, since the moving section 12 is made of elastic material, the risk of excessive clamping force on the cable 19, which could damage the cable 19's outer sheath, is reduced.

[0057] The moving part 23 is used to enable the moving segment 12 to swing from the side of the guide portion away from the second through hole 17 to the side closer to the second through hole 17.

[0058] In this embodiment, the elastic element 24 may be a spring.

[0059] In some embodiments, the elastic support portion 10 is provided with a flexible contact portion 21 on the side near the second through hole 17.

[0060] The flexible contact part 21 can be made of rubber.

[0061] The flexible contact portion 21 can increase the clamping effect of the moving section 12 on the cable 19, as well as the friction between the moving section 12 and the cable 19, so that the moving section 12 can clamp the cable 19 and push the cable 19 into the second through hole 17.

[0062] In some embodiments, a separation notch 26 is provided on the side of the curved segment 11 away from the moving segment 12. The separation notch 26 divides the side of the curved segment 11 away from the moving segment 12 into two segments 28. The curved segment 11 includes a second side facing the support portion 13. The curved segment 11 is provided with an elastic separation portion 27. The elastic separation portion 27 is bent and its two ends are respectively connected to the second sides of the two segments 28.

[0063] Since the curved section 11 is made of elastic material, by reasonably setting the structure of the separation notch 26, the two sections 28 can be separated or joined together.

[0064] The elastic separation part 27 can guide the bent section 11. For example, in the embodiment where the clamping part 14 is provided with a guide groove 29, when the bent section 11 is between the clamping part 14 and the support part 13, the bent section 11 will abut against the support part 13 under the action of elastic restoring force. At this time, the tip formed by the bending of the elastic separation part 27 can be inserted into the guide groove 29, which facilitates the movement of the bent section 11. On the other hand, when the clamping part 14 and the support part 13 are closed, the elastic separation part 27 is compressed, and the distance between its two ends increases, so that the two segments 28 of the bent section 11 can be separated, so that the bent section 11 can form multiple contact points with the spherical cavity 9, thereby improving the fit stability and fit accuracy between the bent section 11 and the spherical cavity 9, and also preventing the ball head component 8 from falling out of the spherical cavity 9.

[0065] In some embodiments, the clamping part 14 is provided with a guide groove 29 on the side facing the support part 13. A plurality of guide grooves 29 are arranged circumferentially around the second through hole 17. The length direction of the guide groove 29 intersects the axis of the second through hole 17. The cross-sectional area of ​​the guide groove 29 gradually increases from the side of the guide groove 29 close to the second through hole 17 to the side away from the second through hole 17.

[0066] On the one hand, the cross-sectional area of ​​the guide groove 29 away from the second through hole 17 is larger, which makes it easier for the tip formed by the bending of the elastic separation part 27 to enter the guide groove 29. On the other hand, when the length of the bent section 11 inserted between the support part 13 and the clamping part 14 is long, when the clamping part 14 and the support part 13 close, the bent section 11 may be pulled out of the spherical cavity 9 excessively, and the deformation of the bent section 11 is large. Therefore, when the distance between the clamping part 14 and the support part 13 is large, sufficient friction can be generated between the bent section 11 and the inner wall of the spherical cavity 9. At this time, the tip formed by the bending of the elastic separation part 27 is located in the part with a smaller cross-sectional area of ​​the guide groove 29. The elastic separation part 27 can hinder the closing of the clamping part 14 and the support part 13, reduce the excessive closing of the two, and reduce the risk of the bent section 11 being pulled out of the spherical cavity 9. At the same time, the elastic separation part 27 also ensures the clamping and fixing effect of the clamping part 14 and the support part 13 on the bent section 11.

[0067] When the length of the bent section 11 inserted between the support part 13 and the clamping part 14 is short, the deformation of the bent section 11 is small when the clamping part 14 and the support part 13 are closed. Therefore, the clamping part 14 and the support part 13 can be closed further, which increases the distance between the two segments 28 of the bent section 11 and ensures the fit between the bent section 11 and the spherical cavity 9.

[0068] In some embodiments, the elastic separation portion 27 is bent to form two parts, each part being curved with its concave side facing away from the second side.

[0069] When the clamping part 14 and the supporting part 13 are closed, the tip of the elastic separating part 27 is subjected to force. Each part of the elastic separating part 27 is curved with its concave side facing away from the second side. This allows the elastic separating part 27 to separate the two segments 28 while generating an elastic force on the two segments 28 toward the clamping part 14. In turn, it generates a force toward the inner wall of the spherical cavity 9. This allows the curved segment 11 to fit better with the inner wall of the spherical cavity 9, improving the fit. On the other hand, it increases the friction between the curved segment 11 and the inner wall of the spherical cavity 9.

[0070] In some embodiments, the side of the curved segment 11 facing the spherical cavity 9 is a convex arc surface.

[0071] The convex arc surface of the curved section 11 fits with the inner wall of the spherical cavity 9, which facilitates the rotation of the ball head component 8 within the spherical cavity 9.

[0072] In some embodiments, the end of the second through hole 17 opposite to the first through hole 18 is a frustoconical shape with the larger end facing the inlet of the spherical cavity 9.

[0073] The frustoconical end of the second through hole 17 reduces the risk of the main body 25 exerting tension on the cable 19 when it rotates relative to the ball head seat 7, which could cause the cable 19 to break.

[0074] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications, alterations, alterations, or substitutions made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model shall fall within the protection scope defined by the claims of the present utility model.

Claims

1. A main and backup water source switching control system for the main shaft seal of a water turbine, applied to the main shaft seal of a water turbine (5), characterized in that, include: The flow detection component (3) is installed in the main water source channel (1) and the backup water source channel (2), respectively. Pressure transmitter (4) is respectively installed in the main water source channel (1) and the backup water source channel (2); A wire assembly is provided on the pressure transmitter (4), the wire assembly being used to lay the cable (19) of the pressure transmitter (4) in a specified direction.

2. The turbine main shaft seal main and backup water source switching control system according to claim 1, characterized in that, The conductor assembly includes: A ball head seat (7) is connected to the pressure transmitter (4) and is provided with a spherical cavity (9). The ball head seat (7) is provided with a first through hole (18) communicating with the spherical cavity (9). A ball head component (8) is housed in the spherical cavity (9). The ball head component (8) is provided with a second through hole (17). The first through hole (18) and the second through hole (17) are arranged opposite to each other.

3. The turbine main shaft seal main and backup water source switching control system according to claim 2, characterized in that, The ball head component (8) includes: The main body (25) has a second through hole (17) disposed on the main body (25) and the main body (25) is inserted into the spherical cavity (9). Around the second through hole (17), the main body (25) is provided with a plurality of guide holes (16). The inlet end of the guide hole (16) is disposed on the side of the main body (25) away from the spherical cavity (9), and the outlet end of the guide hole (16) is disposed on the side of the main body (25) inserted into the spherical cavity (9). An elastic support (10) is provided corresponding to the guide hole (16). The elastic support (10) includes a bending section (11) and a moving section (12). The moving section (12) passes through the guide hole (16). One side of the bending section (11) is connected to one end of the moving section (12) located in the spherical cavity (9). The bending section (11) bends toward the entrance of the spherical cavity (9). The clamping part (14) is movably disposed on the main body (25) along the axial direction of the second through hole (17). A support part (13) is connected to the main body (25), and a clamping part (14) is disposed above the support part (13). The clamping part (14) and the support part (13) cooperate to clamp the other side of the curved section (11). The pusher (15) is movably disposed on the body (25) along the axial direction of the second through hole (17) and is used to abut against the side of the moving section (12) away from the spherical cavity (9).

4. The turbine main shaft seal main and backup water source switching control system according to claim 3, characterized in that, The main body (25) is provided with a guide rod, and the push part (15) is provided with a guide hole, through which the guide rod passes.

5. The turbine main shaft seal main and backup water source switching control system according to claim 4, characterized in that, From the entrance section of the guide hole (16) to the middle of the guide hole (16), the diameter of the guide hole (16) gradually decreases. From the side of the main body (25) away from the spherical cavity (9) to the side of the main body (25) inserted into the spherical cavity (9), the guide hole (16) is inclined in a direction that gradually moves away from the second through hole (17). The ball joint component (8) also includes: A rotating part (22) is rotatably disposed on the pushing part (15). The rotation axis of the rotating part (22) is perpendicular to the axial direction of the second through hole (17). The side of the rotating part (22) away from the second through hole (17) is bent. The moving section (12) abuts against the bend of the rotating part (22). The elastic support part (10) is provided with a protrusion (20) on the side away from the second through hole (17). The movable part (23) is movably connected to the push part (15) along the axial direction of the second through hole (17), and an elastic element (24) is provided between the movable part (23) and the push part (15).

6. The turbine main shaft seal main and backup water source switching control system according to claim 5, characterized in that, The elastic support (10) has a flexible contact part (21) on the side near the second through hole (17).

7. The turbine main shaft seal main and backup water source switching control system according to claim 3, characterized in that, A separation notch (26) is provided on the side of the curved section (11) away from the moving section (12). The separation notch (26) divides the side of the curved section (11) away from the moving section (12) into two segments (28). The curved section (11) includes a second side facing the support (13). The curved section (11) is provided with an elastic separation part (27). The elastic separation part (27) is bent. The two ends of the elastic separation part (27) are respectively connected to the second side of the two segments (28).

8. The turbine main shaft seal main and backup water source switching control system according to claim 7, characterized in that, The elastic separation part (27) is bent to form two parts, each part being a concave side facing away from the second side.

9. The turbine main shaft seal main and backup water source switching control system according to claim 3, characterized in that, The side of the curved section (11) facing the spherical cavity (9) is a convex arc surface.

10. The turbine main shaft seal main and backup water source switching control system according to claim 3, characterized in that, The end of the second through hole (17) opposite to the first through hole (18) is a frustum-shaped cone with the larger end facing the entrance of the spherical cavity (9).

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