Reinforcing device and method for safety valve connecting pipe of hydropower station

Abstract

The application provides a hydropower station safety valve connecting pipe reinforcing device and a hydropower station safety valve connecting pipe reinforcing method, relates to the technical field of hydropower station operation and maintenance, and is designed to solve the problem of local weakness of the hydropower station safety valve connecting pipe. The hydropower station safety valve connecting pipe reinforcing device comprises a sleeve pipe, the sleeve pipe comprises two detachably connected sub-sleeve pipes, and the shapes of the two sub-sleeve pipes are symmetrically arranged along the symmetry plane of the hydropower station safety valve connecting pipe. The hydropower station safety valve connecting pipe reinforcing method comprises the following steps: obtaining parameters of the connecting pipe to be reinforced and modeling; prefabricating the sleeve pipe; on-site processing of the connecting pipe; and installing the sleeve pipe on the connecting pipe. The hydropower station safety valve connecting pipe reinforcing device provided by the application can reduce the safety hazards at the hydropower station safety valve connecting pipe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydropower station operation and maintenance, in particular to a hydropower station safety valve connecting pipe reinforcing device and a hydropower station safety valve connecting pipe reinforcing method. BACKGROUND

[0002] In a hydropower station, in order to prevent excessive water hammer pressure from being generated in the case of generator unit load rejection and reduce the impact of the water conduit, a safety valve is often provided. If the connecting pipe of the safety valve is a bend pipe, there is generally a local thinning defect, which is a weak point in the pressure system. SUMMARY

[0003] A first object of the present application is to provide a hydropower station safety valve connecting pipe reinforcing device to solve the technical problem of local weakness of the existing hydropower station safety valve connecting pipe.

[0004] The hydropower station safety valve connecting pipe reinforcing device provided by the present application comprises a sleeve, the sleeve comprises two detachably connected sub-sleeves, and the shapes of the two sub-sleeves are symmetrically arranged along the symmetry plane of the hydropower station safety valve connecting pipe.

[0005] By arranging two symmetrical sub-sleeves, the sub-sleeves can be sleeved on the connecting pipe from both sides of the hydropower station safety valve connecting pipe, and then the two sub-sleeves are fixedly connected without disassembly loss of the bend pipe structure of the original connecting pipe. By contacting the components connected to the two ends of the connecting pipe with the sub-sleeves, the sub-sleeves can play a reinforcing effect on the connecting pipe outside, and eliminate part of the safety hazards of the equipment.

[0006] The hydropower station safety valve connecting pipe reinforcing device provided by the present application has the following beneficial effects:

[0007] In the preferred technical solution, the sub-sleeve comprises a sub-bend pipe and first and second sub-straight pipes, one end of the sub-bend pipe is fixedly connected to the first sub-straight pipe, and the other end of the sub-straight pipe is fixedly connected to the second sub-straight pipe.

[0008] In the preferred technical solution, the first sub-straight pipe is welded to the sub-bend pipe, an injection hole is arranged at the weld joint of the first sub-straight pipe and the sub-bend pipe, and a rubber plug is inserted into the injection hole.

[0009] In the preferred technical solution, the inner end of the rubber plug is provided with a plurality of drainage channels extending in the radial direction of the rubber plug.

[0010] In the preferred technical solution, a metal wire is further arranged in the sleeve and configured to be wound outside the reinforced connecting pipe.

[0011] A second object of the present application is to provide a hydropower station safety valve connecting pipe reinforcing method to solve the technical problem of local weakness of the hydropower station safety valve connecting pipe.

[0012] The water power station safety valve connecting pipe reinforcing method provided by the application uses the water power station safety valve connecting pipe reinforcing device described above, and comprises the following steps:

[0013] Obtaining parameters of the connecting pipe to be reinforced and modeling;

[0014] Preparation of the sleeve;

[0015] On-site processing of the connecting pipe;

[0016] Mounting the sleeve on the connecting pipe.

[0017] The water power station safety valve connecting pipe reinforcing device provided by the application has the following advantages:

[0018] The parameters of the connecting pipe to be reinforced are obtained and modeled first, so that a more accurate connecting pipe model can be obtained, thereby improving the success rate of sleeve manufacturing.

[0019] In the preferred technical solution, the water power station safety valve connecting pipe reinforcing method further comprises: winding a metal wire around the connecting pipe before mounting the sleeve on the connecting pipe; and filling resin into the space between the sleeve and the connecting pipe after mounting the sleeve on the connecting pipe.

[0020] In the preferred technical solution, the water power station safety valve connecting pipe reinforcing method further comprises: winding waterproof tape around the connecting pipe to block the lower end opening of the space between the sleeve and the connecting pipe before filling the resin.

[0021] In the preferred technical solution, the water power station safety valve connecting pipe reinforcing method further comprises: after filling the resin, taking the sleeve as one electrode and the metal wire wound around the connecting pipe as the other electrode to detect the conductivity between the two electrodes.

[0022] In the preferred technical solution, the water power station safety valve connecting pipe reinforcing method further comprises: removing the rubber plug and welding to block the injection hole.

[0023] By setting the water power station safety valve connecting pipe reinforcing device in the water power station safety valve connecting pipe reinforcing method, the water power station safety valve connecting pipe reinforcing method has all the advantages of the water power station safety valve connecting pipe reinforcing device described above, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the background art, the accompanying drawings needed to be used in the description of the embodiments or the background art will be briefly introduced. Obviously, the accompanying drawings in the following description only explain the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on the provided drawings.

[0025] Figure 1 The structure schematic diagram of the water power station safety valve connecting pipe reinforcing device provided by the embodiment of the present application when resin is poured;

[0026] Figure 2 The structure schematic diagram of the rubber plug in the water power station safety valve connecting pipe reinforcing device provided by the embodiment of the present application when the rubber plug is poured by the injector;

[0027] Figure 3 The flow schematic diagram of the water power station safety valve connecting pipe reinforcing method provided by the second embodiment of the present application;

[0028] Figure 4 The structure schematic diagram of the sub-elbow pipe and the connecting pipe in the water power station safety valve connecting pipe reinforcing method provided by the second embodiment of the present application when the sub-elbow pipe and the connecting pipe are simulated to be assembled;

[0029] Figure 5 The structure schematic diagram of the sub-elbow pipe and the connecting pipe in the water power station safety valve connecting pipe reinforcing method provided by the second embodiment of the present application when the sub-elbow pipe and the connecting pipe are simulated to be assembled.

[0030] Explanation of the reference signs:

[0031] 11 - sub-elbow pipe; 12 - first sub-straight pipe; 13 - second sub-straight pipe; 14 - rubber plug; 141 - drainage channel; 15 - flange of double-jacket pipe; 16 - injector; 20 - connecting pipe. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.

[0033] Embodiment one:

[0034] Figure 1 The structure schematic diagram of the water power station safety valve connecting pipe reinforcing device provided by the embodiment of the present application when resin is poured; Figure 2 The structure schematic diagram of the rubber plug in the water power station safety valve connecting pipe reinforcing device provided by the embodiment of the present application when the rubber plug is poured by the injector. As Figures 1-2As shown, the water power station safety valve connecting pipe reinforcing device provided by the embodiment one of the present application comprises a sleeve, the sleeve comprises two detachably connected sub-sleeves, and the shapes of the two sub-sleeves are symmetrically arranged along the symmetry plane of the water power station safety valve connecting pipe.

[0035] In the present application, the water power station safety valve connecting pipe to be reinforced comprises a bent pipe portion, the bent pipe portion is bent in a certain plane, and along the plane, the pipe section of the connecting pipe 20 is radially symmetrical. Therefore, the plane is the symmetry plane of the water power station safety valve, and correspondingly, the shapes of the two sub-sleeves are also symmetrical along the symmetry plane.

[0036] By arranging two symmetrical sub-sleeves, the two sub-sleeves can be sleeved on the connecting pipe 20 from two sides of the water power station safety valve connecting pipe, and then the two sub-sleeves are fixedly connected, without disassembling and losing the bent pipe structure of the original connecting pipe 20, the sub-sleeves can contact the components connected to the two ends of the connecting pipe 20, and the sub-sleeves can play a reinforcing effect on the connecting pipe 20 outside the connecting pipe 20, thereby eliminating part of the safety hazards of the equipment.

[0037] As shown in the figure, Figure 1 Preferably, the sub-sleeve comprises a sub-bent pipe 11 and a first sub-straight pipe 12 and a second sub-straight pipe 13, one end of the sub-bent pipe 11 is fixedly connected to the first sub-straight pipe 12, and the other end of the sub-straight pipe is fixedly connected to the second sub-straight pipe 13.

[0038] Although the reinforced connecting pipe 20 does not necessarily comprise straight pipes at both ends of the bent pipe, since there is a space between the sub-sleeve and the reinforced connecting pipe 20, even if the shapes of the two do not completely match, the first sub-straight pipe 12 can accommodate the part of the connecting pipe 20 at the lower part of the bent pipe. Specifically, the sub-bent pipe 11 can adopt a standard bent pipe in the shape of a circular arc, and the wall thickness of the bent pipe is uniform.

[0039] By adopting the combination of the first sub-straight pipe 12 and the sub-bent pipe 11, ready-made pipe materials can be selected, which are divided into two along the symmetry plane, thereby improving the convenience of processing, and also being conducive to ensuring the uniformity of the material thickness.

[0040] As shown in the figure, Figure 1 Preferably, the first sub-straight pipe 12 is welded to the sub-bent pipe 11, an injection hole is arranged at the weld joint of the first sub-straight pipe 12 and the sub-bent pipe 11, and a rubber plug 14 is inserted into the injection hole.

[0041] Among them, the first sub-straight pipe 12 is the sub-straight pipe connected to the lower part of the sub-bent pipe 11, and the second sub-straight pipe 13 is the sub-straight pipe connected to the upper part of the second sub-bent pipe 11. Among them, the rubber plug 14 is in the shape of a truncated cone, and the closer to the connecting pipe 20, the smaller the diameter of the rubber plug 14. This shape helps to ensure the sealing effect of the rubber plug 14 on the injection hole. In addition, the needle of the syringe 16 can be a flat needle, the needle of the syringe 16 is inserted into the rubber plug 14 and extends from the rubber plug 14 towards the end face of the connecting pipe 20.

[0042] By setting the injection hole at the welding seam between the first sub-straight pipe 12 and the sub- elbow pipe 11, the resin can be injected into the space between the two sub-casing pipes and the connecting pipe 20 after the two sub-casing pipes are fixed, and the injected resin can flow gradually from the lower part to the upper part, thereby increasing the contact time of the resin with the surface before solidification, which is beneficial to improve the contact effect of the resin.

[0043] As shown in Figure 2 Preferably, the inner end of the rubber plug 14 is provided with a plurality of drainage channels extending in the radial direction of the rubber plug 14.

[0044] Among them, on the inner end surface of the rubber plug 14, a drainage channel in the shape of a cross can be provided, and correspondingly, the area between the cross-shaped is a convex part in the shape of a fan.

[0045] By setting the drainage channel extending in the radial direction of the rubber plug 14, the injected resin can be promptly drained to the surrounding, so that the resin can be fused with the surface of the casing pipe and the connecting pipe 20 as soon as possible.

[0046] Preferably, it also includes a wire (not shown in the figure), which is arranged in the casing pipe and configured to be wound outside the reinforced connecting pipe 20.

[0047] By setting the wire, the casing pipe can be supported outside the connecting pipe 20 to prevent the casing pipe and the elbow pipe from deviating too much. Moreover, because of the ductility of metal, even if the size difference, it will not cause hindrance, in addition, the wire can also cooperate with the inspection of the filling condition of the resin.

[0048] Embodiment two:

[0049] Figure 3 The flowchart of the water power station safety valve connecting pipe reinforcing method provided by the embodiment two of the present application; as Figure 3 shown, the water power station safety valve connecting pipe reinforcing method provided by the embodiment two of the present application uses any of the above water power station safety valve connecting pipe reinforcing devices, and the water power station safety valve connecting pipe reinforcing method comprises:

[0050] Obtaining the parameters of the connecting pipe 20 to be reinforced and modeling;

[0051] Preparation of the casing pipe;

[0052] On-site processing of the connecting pipe 20;

[0053] Installing the casing pipe on the connecting pipe 20.

[0054] In the embodiment, the parameters of the pipe 20 to be reinforced are obtained, a mobile 3D scanning system can be selected to map the field pipe, and the size is obtained through a threshold matching workstation, and then a three-dimensional model is established. The mobile 3D scanning system can be handheld, and is a field data acquisition and processing system based on a laser radar, and is applied to fields such as automatic driving, house building, and topographic mapping. The scanning system is prior art and will not be described in detail.

[0055] The prefabricated sleeve includes selecting the size of the sleeve and determining the reinforcement design parameters. For example, the field pipe 20 model is φ114*20mm, and the model of the sleeve in the embodiment can be selected as φ159*10mm. Based on the mapping result and the reinforcement design parameter requirement, a three-dimensional model of the sleeve is drawn, and a simulation assembly check is performed, as shown in FIG. 6. Figure 4 Specifically, the simulation assembly check is to assemble the three-dimensional model of the field pipe 20 and the three-dimensional model of the sleeve by using three-dimensional modeling software such as SolidWorks, and to check whether the assembly is suitable and whether interference occurs, as shown in FIG. 7. Figure 5

[0056] In the embodiment, the sub-sleeve is not an integral component, and when the sleeve is manufactured, a bent pipe and two straight pipes can be selected, the two straight pipes are respectively welded and fixed at two ends of the bent pipe, and then the two straight pipes are cut along the symmetry plane. In this way, the difficulty of workshop processing can be reduced, and manufacturing of various types of bent pipes can be facilitated.

[0057] Further, when the groove is manufactured before welding, the groove is outwardly opened, that is, the closer to the inner side of the sleeve, the narrower the width of the groove. On the one hand, the prefabricated groove can ensure the size of the groove and improve the welding quality, and on the other hand, the outward opening of the groove is beneficial to the operation of the welder.

[0058] In addition, the field processing pipe 20 includes rust removal of the surface of the pipe 20 to be repaired by using a rust removal agent and polishing. If the rust removal agent is used, the pipe 20 after rust removal is also cleaned and dried.

[0059] The sleeve is installed on the pipe 20, including sleeving the two sub-sleeves on the pipe 20 from both sides of the pipe 20, and connecting the clamping sleeve flanges 15 by using bolts to realize fixation.

[0060] ​The parameters to be reinforced are obtained and modeled in advance, so that a more accurate model of the nozzle 20 can be obtained to improve the success rate of the sleeve manufacturing. The nozzle 20 can be processed on site to ensure the surface performance of the nozzle 20, thereby preventing the nozzle 20 from being gradually corroded and damaged after rusting.

[0061] As shown in Figure 3 Preferably, the method for reinforcing the nozzle of the safety valve of the hydropower station further comprises: winding the metal wire around the nozzle 20 before the sleeve is installed on the nozzle 20, and filling the space between the sleeve and the nozzle 20 with resin after the sleeve is installed on the nozzle 20.

[0062] The metal wire cannot be too thick, so that the sleeve cannot be completely installed in place, or the metal wire is excessively pressed after the sleeve is installed in place, so that the combination between the metal wire and the sleeve is too tight, a certain sealing effect is formed, and the resin is difficult to penetrate. For example, since the metal wire does not strictly and absolutely completely adhere to the outer wall of the nozzle 20 when winding the nozzle 20, and the metal wire can be flattened, if the gap between the sleeve and the nozzle 20 is 20 mm, the diameter of the metal wire can be 20±2 mm, and the metal wire can be selected as a high-purity copper wire. Specifically, in this embodiment, a plurality of metal wires can be arranged around the outer wall of the nozzle 20, and each metal wire can extend from the second sub-straight pipe 13 above. In addition, after the resin is filled, the sleeve can be repeatedly retired in the lateral direction, so that the resin can cover each structure surface in the sleeve. In addition, the resin can be an insulating resin such as epoxy resin.

[0063] By arranging the metal wire, the gap between the sleeve and the nozzle 20 can be filled, so that the sleeve and the nozzle 20 can be firmly installed, and the error of the gap between the inner wall and the outer wall caused by the inconsistent shape can be compensated.

[0064] As shown in Figure 3 Preferably, the method for reinforcing the nozzle of the safety valve of the hydropower station further comprises: winding the waterproof tape around the nozzle 20 to block the lower end opening of the space between the sleeve and the nozzle 20 before filling the resin.

[0065] The waterproof tape is wound around the position where the lower end of the nozzle 20 is connected to other components. In addition, the waterproof tape can also fix the end of the metal wire. Specifically, the waterproof tape can be the tape used by plumbers to repair pipes.

[0066] By winding the waterproof tape around the pipe to block the lower end opening of the space between the sleeve and the nozzle 20, the waste of the resin can be reduced or even eliminated, and the difficulty of filling the resin can be reduced.

[0067] As shown in Figure 3As shown, preferably, the method for reinforcing the connecting pipe of the safety valve of the hydropower station further comprises: after filling the resin, taking the sleeve as one electrode and the metal wire wound on the connecting pipe 20 as the other electrode to detect the conductivity between the two electrodes.

[0068] Specifically, since multiple metal wires are arranged, the current is measured by taking each metal wire as one electrode and the sleeve as the other electrode. The current after filling the resin is measured respectively before and after filling the resin, and the greater the difference between the current before and after filling the resin, the more full the epoxy resin is filled between the metal wire and the sleeve. If the current after filling the resin is zero, it means that the metal wire and the sleeve are completely isolated. If the current of each metal wire is zero, it is the best filling state. If the filling fullness condition is not met, the resin is filled again.

[0069] Taking the sleeve and the metal wire as electrodes respectively, the conductivity between the two electrodes is detected, which can be used to judge whether the resin is completely filled in place by detecting the insulation between the metal wire and the sleeve, and the detection accuracy is high and the operation is convenient.

[0070] As shown in Figure 3 , preferably, the method for reinforcing the connecting pipe of the safety valve of the hydropower station further comprises: removing the rubber plug 14 and welding the injection hole.

[0071] After detecting that the resin is completely filled in place, the rubber plug 14 is removed, and the injection hole is sealed by welding.

[0072] Removing the rubber plug 14 can avoid air leakage between the sleeve and the connecting pipe 20 due to aging of the rubber, and sealing the injection hole by welding can completely prevent air leakage from the injection hole.

[0073] As shown in Figure 3 , specifically, the method for reinforcing the connecting pipe of the safety valve of the hydropower station comprises the following steps in sequence:

[0074] S1, obtaining the parameters of the connecting pipe 20 to be reinforced and modeling:

[0075] The parameters of the connecting pipe 20 to be reinforced can be obtained by selecting a mobile 3D scanning system to survey the site bending pipe and obtaining the size through a threshold matching workstation, and then establishing a three-dimensional model.

[0076] S2, pre-preparing the sleeve:

[0077] The size of the sleeve is selected, and the reinforcement design parameters are determined. Based on the surveying results and the reinforcement design parameter requirements, a three-dimensional model of the sleeve is drawn, and a simulation assembly check is performed. Specifically, the simulation assembly check is that a three-dimensional model of the field connection pipe 20 is assembled with the three-dimensional model of the sleeve by using a three-dimensional modeling software such as SolidWorks, and whether the assembly is suitable and whether interference occurs is checked by sectioning. If the check is passed, the sleeve can be prefabricated in the workshop, and the sleeve is divided into two sub-sleeves.

[0078] A section of elbow pipe and two sections of straight pipe are selected, and the two sections of straight pipe are respectively welded and fixed at the two ends of the elbow pipe. After the welding is completed, the sleeve is cut along the symmetry plane to form two sub-sleeves.

[0079] Further, when the groove is made before welding, the groove is opened outward, that is, the closer to the inside of the sleeve, the narrower the width of the groove.

[0080] The opposite clamping sleeve flanges 15 are respectively welded at the edge positions of the two sub-sleeves in contact. One of the opposite two clamping sleeve flanges 15 is provided with a threaded hole.

[0081] S3, field processing of the connection pipe 20:

[0082] The surface of the connection pipe 20 to be repaired is derusted by using a derusting agent, grinding and the like. If the derusting agent is used to derust, the connection pipe 20 after derusting is also cleaned and dried.

[0083] S4, winding a metal wire on the connection pipe 20;

[0084] S5, winding the connection pipe 20 with waterproof tape to block the lower end opening of the space between the sleeve and the connection pipe 20.

[0085] The waterproof tape is wound at the position where the lower end of the connection pipe 20 is connected to other components. In addition, the waterproof tape can also fix the end of the metal wire.

[0086] S6, installing the sleeve on the connection pipe 20:

[0087] The two sub-sleeves are sleeved on the connection pipe 20 from both sides of the connection pipe 20, and the opposite clamping sleeve flanges 15 are connected by bolts to realize fixation.

[0088] S7, filling resin into the space between the sleeve and the connection pipe 20;

[0089] S8, after filling the resin, taking the sleeve as one electrode and the metal wire wound on the connection pipe 20 as the other electrode to detect the conductivity between the two electrodes:

[0090] Specifically, since multiple metal wires are arranged, each metal wire is taken as an electrode, and the sleeve is taken as another electrode to be electrified, and the current size is measured. Wherein, the current is measured before and after the resin is filled respectively, and the greater the difference between the current after the resin is filled and the current before the resin is filled, the more full the epoxy resin is filled between the metal wire and the sleeve. If the current after the resin is filled is zero, it means that the metal wire and the sleeve are completely isolated. If the current of each metal wire is zero, it is the best filling state. If the filling fullness condition is not met, the resin is filled again.

[0091] S8, remove the rubber plug 14 and weld the injection hole:

[0092] Wherein, the related steps of the field treatment of the butt joint pipe 20 and the sleeve manufacturing are not limited in the sequence.

[0093] Although the present application is disclosed as above, the present application is not limited to this. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and the protection scope of the present application should be limited by the scope defined by the claims.

[0094] Finally, it should also be noted that in this text, the relationship terms such as first and second 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 the entities or operations. Moreover, the term "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or equipment including the element.

[0095] In the above embodiments, the description of the orientation such as "upper", "lower" and the like is based on the drawings shown.

[0096] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application.

[0097] Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for reinforcing a connecting pipe of a safety valve of a hydroelectric power station, characterized in that, The water power station safety valve connecting pipe reinforcing device comprises a sleeve and a wire, the wire is arranged in the sleeve and configured to be wound outside the connecting pipe (20) to be reinforced, the sleeve comprises two detachably connected sub-sleeves, the shapes of the two sub-sleeves are symmetrically arranged along the symmetry plane of the water power station safety valve connecting pipe; the sub-sleeve comprises a sub-ellbow (11) and a first sub-straight pipe (12), one end of the sub-ellbow (11) is fixedly connected with the first sub-straight pipe (12), the first sub-straight pipe (12) is welded with the sub-ellbow (11), an injection hole is arranged at the weld joint of the first sub-straight pipe (12) and the sub-ellbow (11), a rubber plug (14) is inserted into the injection hole, a plurality of drainage channels extending along the radial direction of the rubber plug (14) are arranged at the inner end of the rubber plug (14); The water power station safety valve connecting pipe reinforcing method comprises the following steps: obtaining the parameters of the connecting pipe (20) to be reinforced and modeling; preparing the sleeve; on-site processing of the connecting pipe (20); winding the wire on the connecting pipe (20), then installing the sleeve on the connecting pipe (20), then filling resin into the space between the sleeve and the connecting pipe (20), after filling the resin, taking the sleeve as one electrode and the wire wound on the connecting pipe (20) as the other electrode to detect the conductivity between the two electrodes.

2. The method of reinforcing a penstock of a hydraulic power plant safety valve according to claim 1, characterized in that, The sub-sleeve further comprises a second sub-straight pipe (13), the other end of the sub-straight pipe is fixedly connected with the second sub-straight pipe (13).

3. The method of reinforcing a penstock of a hydraulic power plant safety valve according to claim 1, characterized in that, Further comprising: before installing the sleeve on the connecting pipe (20), winding the connecting pipe (20) with waterproof tape to block the lower end opening of the space between the sleeve and the connecting pipe (20).

4. The method of reinforcing a penstock of a hydraulic power plant safety valve according to claim 1, characterized in that, Further comprising: removing the rubber plug (14) and welding to block the injection hole.

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