Fixing device for a generator stator slot leakage flux sensor

Abstract

The utility model relates to a kind of fixing device of generator stator slot leakage flux sensor, belong to generator monitoring equipment technical field, the device includes sensor, base and insulating pin;Base is rectangular insulating plate, is equipped with convex part and positioning groove, convex part is embedded in stator slot line, positioning groove is matched with the shape of stator slot line side wall to realize accurate positioning, top surface sets up clamping groove fixed sensor;Base four corners are provided with through hole and insert diameter gap matched insulating pin;Base is fixed by the double positioning structure of convex part and positioning groove combination insulating pin, ensure that sensor is stable in the anti-vibration of generator operation, while silica gel filling and epoxy resin bonding enhance sealing property and insulating property.The utility model is mainly used for the reliable installation of generator rotor winding turn-to-turn short-circuit on-line monitoring system sensor and signal transmission protection, can solve the problem of poor sensor installation stability, cable wiring is vulnerable to vibration interference and the problem of insufficient insulating pin fixing reliability.

Description

Technical Field

[0001] This utility model belongs to the technical field of power equipment installation structure, specifically relating to a fixing device for a leakage flux sensor in the stator slot of a generator. Background Technology

[0002] In generator rotor inter-turn short circuit monitoring systems, the installation reliability of leakage flux sensors directly affects the accuracy of monitoring data. In existing technologies, sensors are typically fixed to the stator slots using a single mechanical structure or adhesive bonding. However, due to the continuous vibration caused by the high-speed rotation of the rotor during generator operation, as well as material deformation caused by temperature rise, sensors are prone to displacement or detachment, resulting in unstable signal acquisition.

[0003] If the installation relies on a simple shape match between the base and the stator slot, lacking a multi-level positioning design, repeated adjustments are required during installation, which is time-consuming and makes it difficult to guarantee positioning accuracy. In addition, the sensor signal lines are often directly exposed in the slot space. Due to vibration and friction with the slot wall, the insulation layer of the cable is easily worn or even broken. Existing wiring structures mostly use open slots or binding fixation, which cannot effectively distribute mechanical stress, posing safety hazards in long-term operation.

[0004] For fixing insulating pins, conventional designs use a gap fit combined with adhesive bonding. However, the adhesive is prone to aging and failure under high-temperature environments, leading to fretting wear between the insulating pin and the mounting hole, thus reducing insulation performance. Furthermore, relying solely on a gap fit is insufficient to eliminate axial movement caused by vibration, requiring frequent maintenance and inspection. The root cause of these problems lies in the failure to systematically integrate mechanical positioning, cable vibration protection, and multiple fixing mechanisms, as well as limitations in material matching and structural adaptability design, making it difficult to simultaneously achieve installation reliability and long-term stability. Utility Model Content

[0005] One objective of this invention is to provide a fixing device for a leakage flux sensor in the stator slot of a generator, which solves the problems of poor sensor installation stability, easy interference from vibration in cable routing, and insufficient reliability of insulating pin fixing. In particular, the existing fixing devices rely on a single mechanical structure or adhesive method, which is difficult to resist high-speed rotational vibration and temperature rise deformation, resulting in sensor displacement or signal line wear. The design of adhesive bonding between the insulating pin and the mounting hole is prone to aging and failure at high temperatures, causing fretting wear and reduced insulation performance.

[0006] To achieve these objectives and other advantages of this utility model, the present utility model provides a fixing device for a generator stator slot leakage flux sensor, which includes a sensor, a base, an insulating pin, and a signal line.

[0007] The base is a rectangular insulating plate with a protrusion on its bottom surface. The protrusion fits into the generator stator slot. The two sides of the protrusion are provided with positioning grooves that match the shape of the stator slot sidewall. The top surface of the base is provided with a slot for fixing the sensor and a cable routing groove.

[0008] There are four through holes at the four corners of the base. Insulating pins are inserted into the through holes, and the diameter of the insulating pins is fitted with the inner diameter of the through holes with clearance.

[0009] The sensor is fixed to the base by a slot, and the sensor signal line is led out from the cable routing channel, which is filled with silicone.

[0010] The base is fixed to the stator slot by an insulating pin passing through the through hole. The stator slot has a mounting hole at the corresponding position, and epoxy resin adhesive is injected into the mounting hole.

[0011] Preferably, the positioning groove of the base of this utility model is provided with several protrusions, the extension direction of the protrusions is consistent with the length direction of the stator groove; after the base protrusion is embedded into the stator groove, one side of the protrusion contacts the side wall of the stator groove to achieve pre-positioning, and then is fixed by the cooperation of the insulating pin with the pre-drilled mounting hole.

[0012] Preferably, the cross-section of the protrusion of this utility model is trapezoidal or rectangular, and several protrusions are arranged in parallel and spaced apart to form intervals, which are filled with elastic insulating and thermally conductive material.

[0013] Preferably, the cable routing channel of the base of this utility model is provided with an elastic pressure plate; the fixed end of the elastic pressure plate is fixed to the side wall of the cable routing channel, and the free end of the elastic pressure plate is bent toward the center of the cable routing channel at a bending angle of 45 degrees.

[0014] The end of the elastic pressure plate is provided with an arc-shaped groove, the radius of which matches the outer diameter of the cable;

[0015] The signal line passes through the arc-shaped groove of the splitter clamp, and the elastic pressure plate presses the cable tightly against the side wall of the cable routing channel.

[0016] Preferably, the inner wall of the through hole of the base of this utility model is provided with an internal thread, and the outer surface of the insulating pin is provided with an external thread that matches the internal thread; a compression spring is provided at the top of the insulating pin, and when the insulating pin is screwed into the through hole, the external thread and the internal thread mesh, and the bottom surface of the compression spring presses against the top surface of the base; the inner wall of the pre-drilled hole of the stator slot is coated with epoxy resin adhesive, and after the insulating pin is screwed into the pre-drilled hole, the adhesive fills the thread gap.

[0017] Preferably, the signal line of this utility model is led out from the base and passes through the galvanized cable conduit and the plastic-coated metal flexible conduit in sequence, and a rubber sheath is provided at the connection between the galvanized cable conduit and the plastic-coated metal flexible conduit.

[0018] This utility model has at least the following beneficial effects:

[0019] 1. Existing fixing devices rely on a single mechanical structure or adhesive method, which is difficult to resist high-speed rotational vibration and temperature rise deformation, leading to sensor displacement or signal line wear. The design of adhesive bonding with a gap fit between the insulating pin and the mounting hole is prone to aging and failure at high temperatures, causing fretting wear and a decline in insulation performance. This utility model significantly improves the positioning accuracy and vibration resistance of sensor installation by using a double match between the convex part and the positioning groove on the bottom surface of the base to the shape of the stator groove, combined with the fixing of the insulating pin and epoxy resin adhesive. The silicone filling in the cable routing groove effectively suppresses signal line vibration displacement, reduces the risk of insulation layer wear, and enhances sealing and insulation performance. It effectively solves the problems of poor sensor installation stability, cable routing being susceptible to vibration interference, and insufficient reliability of insulating pin fixing.

[0020] 2. When an auxiliary positioning structure is lacking, the base position needs to be repeatedly adjusted, which is time-consuming and makes it difficult to ensure consistent positioning. This invention adds a raised strip to the positioning groove, which contacts the side wall of the stator slot line, enabling rapid pre-positioning before installation, reducing manual adjustment steps, and improving installation efficiency. The extended direction of the raised strip is consistent with the length of the slot line, ensuring the axial alignment accuracy between the base and the slot line. This effectively solves the problems of low pre-positioning accuracy and low installation efficiency between the base and the stator slot line.

[0021] 3. To address the issues of stress concentration and poor heat dissipation at the contact point between the convex strip and the stator slot, this invention uses trapezoidal or rectangular cross-section convex strips to disperse the contact stress with the sidewall of the slot, preventing localized stress concentration that could lead to base deformation. The spaced areas are filled with elastic insulating and thermally conductive material, which buffers vibration and impact, improves heat conduction within the slot, and extends the sensor's lifespan.

[0022] 4. To address the issue of signal cables becoming loose or damaged due to friction within the cable tray caused by vibration, this utility model utilizes an elastic pressure plate with a 45-degree bending angle and an arc-shaped groove design to apply uniform radial pressure to the signal cable, preventing the cable from rubbing against the tray wall during vibration. The fixed end of the pressure plate is rigidly connected to the side wall of the channel, ensuring a long-lasting and stable constraint force.

[0023] 5. To address the issues of axial movement of the insulating pin and uneven adhesive distribution, this invention utilizes a threaded fit combined with a spring preload to eliminate axial movement of the insulating pin. Epoxy resin adhesive fills the thread gaps, enhancing sealing and resistance to fretting wear. This dual-fixing mechanism improves the long-term reliability of the insulating pin under high-temperature conditions.

[0024] 6. To address the issue of insufficient vibration protection for exposed signal cables, this invention employs segmented protection with galvanized cable conduit and PVC-coated metal flexible conduit, respectively resisting mechanical impact and electromagnetic interference; the rubber sheath buffers stress at the connection points, preventing cable bending and fatigue fracture, and ensuring stable signal transmission.

[0025] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the installation position structure of the leakage flux sensor of this utility model;

[0027] Figure 2 This is a schematic diagram of the first structure of the fixing device described in this utility model;

[0028] Figure 3 This is a schematic diagram of a second structure of the fixing device described in this utility model;

[0029] Figure 4 This is a schematic diagram of the insulating pin described in this utility model.

[0030] Among them, there is a leakage flux sensor 10, a generator rotor 20, a generator stator 30, a generator stator slot 301, a base 101, a protrusion 102, a positioning groove 103, a slot 104, a cable routing groove 105, a through hole 106, a protrusion 107, a protrusion interval 108, an elastic pressure plate 109, a fixed end 1091, a free end 1092, an arc-shaped groove 1093, an insulating pin 110, a compression spring 1101, and an external thread 1102. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the embodiments, so that those skilled in the art can implement it based on the description.

[0032] like Figures 1-4 As shown, the present invention provides a fixing device for a leakage flux sensor in a generator stator slot, comprising: a leakage flux sensor 10, a base, an insulating pin, and a signal line.

[0033] The base 101 is a rectangular insulating plate with a protrusion 102 on its bottom surface. The protrusion 102 fits into the generator stator slot 301. The protrusion 102 has positioning grooves 103 on both sides that match the shape of the side wall of the generator stator slot 301. The top surface of the base 101 has a slot 104 for fixing the leakage flux sensor 10 and a cable routing groove 105. As shown in Figure 1, the side wall of the generator stator slot 301 has a concave-convex structure. The positioning grooves 103 on both sides of the protrusion 102 of the base 101 are adapted to the concave-convex structure. The slot 104 in the figure is rectangular, but it can actually be set according to the shape of the sensor, such as circular or other shapes, as long as it can fit the sensor.

[0034] The base 101 has four through holes 106 at its four corners. Insulating pins 110 are inserted into the through holes 106, and the diameter of the insulating pins 110 is clearance-fitted with the inner diameter of the through holes 106.

[0035] The leakage flux sensor 10 is fixed to the base 101 via the slot 104. The signal line of the leakage flux sensor 10 is led out from the cable routing groove 105, which is filled with silicone.

[0036] The base 101 is fixed to the generator stator slot 301 by an insulating pin 110 passing through the through hole 106. The generator stator slot 301 has a mounting hole at the corresponding position, and epoxy resin adhesive is injected into the mounting hole.

[0037] Specifically, regarding the base structure and positioning design, the base 101 uses a rectangular insulating plate with a thickness ranging from 8 mm to 12 mm. The bottom surface has a protrusion 102 with a height of 3 mm to 5 mm. The positioning grooves 103 on both sides of the protrusion 102 have a depth of 2 mm to 4 mm, and their width is controlled within ±0.2 mm of the dimensional error of the generator stator slot 301 sidewall. The base 101 can be made of epoxy resin laminate or polyimide insulating board, which have high temperature resistance and insulation properties. The positioning grooves 103 are machined using a CNC milling machine to ensure matching accuracy with the generator stator slot 301 sidewall. During installation, the protrusion 102 on the bottom surface of the base 101 is embedded into the generator stator slot 301, the positioning groove 103 fits against the side wall of the generator stator slot 301, and the slot 104 on the top surface is used to fix the leakage flux sensor 10. The gap between the inner wall of the slot 104 and the housing of the leakage flux sensor 10 is 0.5 mm to 1 mm. During machining, a contour milling process can be referenced, and the tool path can be adjusted by measuring the dimensions of the side wall of the generator stator slot 301. During installation, the protrusion 102 and the slot line should be aligned first, and then the horizontal alignment should be finely adjusted using the positioning groove 103. This design reduces installation deviation, improves positioning accuracy to within ±0.5 mm, and the material's temperature resistance range covers -20℃ to 150℃, avoiding displacement caused by thermal deformation.

[0038] Regarding the fixing mechanism of the insulating pins and mounting holes, the diameter of the through holes 106 at the four corners of the base 101 is 6 mm to 8 mm, and the diameter of the insulating pins 110 is 5.9 mm to 7.9 mm, with a clearance fit of 0.1 mm to 0.3 mm between them and the through holes 106. The depth of the mounting holes in the generator stator slot 301 is 6 mm to 8 mm, and the hole diameter matches the diameter of the insulating pins 110. The insulating pins 110 can be made of polytetrafluoroethylene or glass fiber reinforced nylon, and the epoxy resin adhesive can be a two-component epoxy adhesive. During installation, the insulating pins 110 are inserted into the through holes 106 of the base 101 and then pass through the mounting holes in the generator stator slot 301. Epoxy resin adhesive is injected into the mounting holes, and after curing, a mechanical and adhesive composite fixation is formed. The installation process is similar to bolt pre-tightening, with the clearance fit ensuring perpendicularity. After the adhesive fills the gaps, it cures to enhance vibration resistance. The epoxy resin curing conditions are 24 hours at room temperature or 1 hour at 80°C to ensure a uniform adhesive layer without bubbles. This mechanism increases the tensile strength of the insulating pin 110 to over 200 N, allows it to withstand vibration frequencies from 50 Hz to 100 Hz, and achieves an epoxy resin insulation resistance value ≥1×10⁻⁶. 12 Oh, to avoid the risk of electric leakage.

[0039] Regarding the cable routing trough and signal line protection design, the width of the cable routing trough 105 is 1.2 to 1.5 times the outer diameter of the cable, and the depth is 1.5 to 2 times the cable diameter. The silicone filler thickness covers the cable surface by at least 2 mm. Room temperature vulcanizing silicone rubber with a Shore hardness of 30A to 50A can be used. The leakage flux sensor 10 signal line is led out from the slot 104 and laid along the cable routing trough 105. The cable routing trough 105 is filled with silicone until flush with the slot opening, forming an elastic coating after curing. The silicone filling process references electronic potting technology, using a dispensing gun to evenly inject the silicone into the trough, avoiding air bubble residue. The distance between the signal line routing path and the inner wall of the trough is ≥1 mm to prevent friction damage. This design reduces the cable's vibration displacement to within ±0.2 mm. The width of the cable routing trough 105 is adapted to the cable size, reducing the bending radius to ≥5 times the cable diameter, ensuring signal transmission stability. The technical parameters meet the requirements of actual application, as verified by vibration table testing and high-temperature aging tests.

[0040] In this embodiment, as shown in Figure 1, the generator includes a generator rotor 20 and a generator stator 30. During the manufacturing process, a leakage flux sensor 10 is pre-set in the generator stator slot 301 on the inner wall of the generator stator 30, and a mounting hole is opened. The leakage flux sensor 10 (such as Honeywell HMC1001) is fixedly installed onto the base 101 through the slot 104 and secured with adhesive. Then, the base 101 is embedded into the mounting position in the generator stator slot 301, and insulating pins 110 are inserted through the four through holes 106. The base 101 is fixed in the generator stator slot 301. The signal line of the leakage flux sensor 10 is led out from the cable routing groove 105, which is filled with silicone. Then, the cable is led to the outside of the generator stator 30, thus completing the installation. Later, the signal line is connected to a short-circuit monitoring system for monitoring.

[0041] Furthermore, in another embodiment, the positioning groove 103 of the base 101 of this utility model is provided with a plurality of protrusions 107, the extending direction of the protrusions 107 being consistent with the length direction of the generator stator slot 301; after the protrusion 102 of the base 101 is inserted into the generator stator slot 301, one side of the protrusion 107 contacts the side wall of the generator stator slot 301 to achieve pre-positioning, and then is fixed by the insulating pin 110 cooperating with the pre-drilled mounting hole.

[0042] Regarding the structural design of the protrusion 107, the protrusion 107 set in the positioning groove 103 of the base 101 has a height of 1 mm to 3 mm, a width of 2 mm to 4 mm, and a spacing of 5 mm to 8 mm between adjacent protrusions 107. The protrusion 107 can be made of aluminum alloy T6061 or 304 stainless steel or plastic strips, and the surface is anodized to improve wear resistance. The extension direction of the protrusion 107 is strictly parallel to the length direction of the generator stator slot 301, and the allowable angular deviation does not exceed ±0.5 degrees. During processing, it can be milled on the bottom surface of the positioning groove 103 using a CNC milling machine, or integrally formed with the base 101 by injection molding. The top corner of the protrusion 107 can be machined into a rounded corner with a radius of 0.2 mm to avoid scratching the coating on the side wall surface of the generator stator slot 301. During installation, the contact area between the working surface of the rib 107 and the side wall of the generator stator slot 301 must reach more than 70% of the surface area of ​​a single rib 107. The distribution of contact spots can be inspected by blue oil.

[0043] Regarding the fit between the protrusion 107 and the positioning groove 103, the depth of the positioning groove 103 is 0.5 mm to 1 mm greater than the height of the protrusion 107, forming an installation space to accommodate the protrusion 107. The gap between the side walls of the groove and the side of the protrusion 107 is controlled between 0.1 mm and 0.3 mm, ensuring smooth assembly while avoiding excessive looseness. When the protrusion 102 of the base 101 is embedded in the generator stator slot 301, about two protrusions 107 simultaneously contact the side walls of the slot line, forming multi-point constraint and achieving the purpose of pre-positioning.

[0044] Regarding the pre-positioning and fixing of the insulating pin 110, after the pre-positioning of the protrusion 107 is completed, a 5 mm diameter locating pin is used to temporarily fix the base 101. Then, a 6 mm diameter mounting hole is drilled at the pre-positioned position in the generator stator slot 301 using a hand drill. The deviation between the axis of the mounting hole and the axis of the through hole 106 of the base 101 does not exceed 0.1 mm, which can be calibrated using a coordinate measuring machine. The insulating pin 110 is pressed into the mounting hole with an interference fit, and the interference is controlled within the range of 0.02 mm to 0.05 mm. After pre-drilling, iron filings need to be removed with compressed air, and a 0.1 mm thick epoxy resin adhesive is applied to the hole wall. During final fixing, the perpendicularity error between the insulating pin 110 and the plane of the base 101 must be less than 0.5 degrees, which can be checked and adjusted in real time using a right-angle ruler. This structure reduces the installation time of the base 101 by 40%, and the positioning repeatability accuracy reaches ±0.15 mm.

[0045] Furthermore, in another embodiment, the cross-section of the protrusion 107 of this invention is trapezoidal or rectangular, and several protrusions 107 are arranged in parallel and spaced apart to form protrusion intervals 108, which are filled with elastic insulating and thermally conductive material. Regarding the cross-sectional shape design of the protrusion 107, the cross-section of the protrusion 107 can be trapezoidal or rectangular. The base width of the trapezoidal cross-section is 3 mm to 5 mm, the top width is 1 mm to 2 mm, and the height is 1.5 mm to 3 mm; the width of the rectangular cross-section is 2 mm to 4 mm, and the height is 2 mm to 3 mm.

[0046] Regarding the arrangement of the raised strip intervals 108, the spacing between adjacent raised strips 107 is 4 mm to 6 mm, forming the raised strip intervals 108. The bottom surface of the raised strip intervals 108 can preferably be machined with a positioning groove of 0.5 mm depth to restrict the flow range of the filling material. Before filling, the surface of the raised strip intervals 108 needs to be cleaned with acetone to remove oil and oxide layers. The elastic insulating and thermally conductive material can be silicone rubber (thermal conductivity ≥ 0.5 W / m·K) or polyurethane elastomer (thermal conductivity ≥ 0.3 W / m·K), such as Kingstar's K-539 high-performance thermally conductive silicone. The filling thickness is 2 mm to 3 mm, and after filling, the material surface protrudes 0.2 mm to 0.5 mm above the top surface of the raised strips 107 to form a pre-compression. The filling process can use a vacuum dispensing machine to inject the material into the raised strip intervals 108, with the dispensing pressure controlled at 0.2 MPa to 0.5 MPa, and the curing temperature set at 80℃ to 100℃.

[0047] During installation, the filler material undergoes an elastic deformation of 0.1 mm to 0.3 mm under pressure, which both buffers vibration impact and maintains stable contact pressure between the convex strip 107 and the side wall of the generator stator slot 301. Tests show that, under vibration frequency of 50 Hz and amplitude ±0.5 mm, the stress relaxation rate of the filler material is <5% / 100h.

[0048] Furthermore, in another embodiment, the cable routing groove 105 of the base 101 of this utility model is provided with an elastic pressure plate 109 (one piece or two pieces can be symmetrically arranged on the left and right sides, as long as they can press the signal line tightly); the fixed end 1091 of the elastic pressure plate 109 is fixed to the side wall of the cable routing groove 105, and the free end 1092 of the elastic pressure plate 109 is bent towards the center of the cable routing groove 105 at a bending angle of 45 degrees;

[0049] The free end 1092 of the elastic pressure plate 109 is provided with an arc-shaped groove 1093, the radius of which matches the outer diameter of the cable;

[0050] The signal line passes through the arc-shaped groove 1093 of the splitter clamp, and the elastic pressure plate 109 presses the cable tightly against the side wall of the cable routing groove 105.

[0051] Specifically, the thickness of the elastic pressure plate 109 is 0.5 mm to 1 mm, and its width is 80% to 90% of the width of the cable tray 105. The angle at which the free end 1092 of the elastic pressure plate 109 bends towards the center of the channel is strictly controlled within 45 degrees ± 2 degrees, and the bending radius is equal to 2 to 3 times the thickness of the elastic pressure plate 109. The radius of the arc-shaped groove 1093 is 50% to 55% of the cable's outer diameter; for example, when the cable's outer diameter is 3 mm, the groove radius is 1.5 mm to 1.65 mm. The elastic pressure plate 109 can be made of 304 stainless steel strip or phosphor bronze strip, preferably annealed to maintain its elasticity. During processing, a continuous die stamping process is used, first punching out the shape and then bending it into shape, with the bending die angle tolerance controlled within ±0.5 degrees.

[0052] The fixed end 1091 of the elastic pressure plate 109 is fixed to the side wall of the cable tray 105 by two M3 stainless steel bolts, with the bolt spacing being 1 / 3 to 1 / 2 of the width of the elastic pressure plate 109. Before installation, a positioning step with a depth of 2 mm needs to be machined on the side wall of the channel, and the step width is 0.1 mm wider than the fixed end 1091 of the elastic pressure plate 109. The contact surface between the elastic pressure plate 109 and the side wall of the channel can be coated with a 0.05 mm thick nitrile rubber layer and fixed by epoxy adhesive. During assembly, the bolts are pre-tightened first, and then the threads are cured with anaerobic adhesive to prevent loosening. The initial position of the free end 1092 of the elastic pressure plate 109 is 3 mm to 5 mm away from the side wall of the channel, forming a pre-compression space.

[0053] When inserting the signal cable, it must be guided along the center line of the arc-shaped groove 1093, with the contact area between the cable's outer wall and the groove ≥85%. The deformation of the elastic pressure plate 109 under pressure is controlled within the elastic deformation range, and the maximum deformation displacement does not exceed 20% of the length of the free end 1092. After installation, the cable fixing effect is tested by applying a 5N axial tensile force; the displacement must be less than 0.2 mm. This design reduces the cable vibration displacement to ±0.15 mm and prevents insulation layer deformation due to excessive clamping force.

[0054] Furthermore, in another embodiment, the inner wall of the through hole 106 of the base 101 of this utility model is provided with an internal thread, and the outer surface of the insulating pin 110 is provided with an external thread 1102 that matches the internal thread; a compression spring 1101 is provided at the top of the insulating pin 110, and when the insulating pin 110 is screwed into the through hole 106, the external thread 1102 engages with the internal thread, and the bottom surface of the compression spring 1101 presses against the top surface of the base 101; the inner wall of the pre-drilled hole of the generator stator slot 301 is coated with epoxy resin adhesive, and after the insulating pin 110 is screwed into the pre-drilled hole, the adhesive fills the thread gap.

[0055] Specifically, the inner wall of the through hole 106 in the base 101 is machined with a standard metric internal thread of M6×1 or M8×1.25, with an effective thread length of 8 mm to 12 mm. The outer surface of the insulating pin 110 is machined with a corresponding external thread 1102, with the major diameter tolerance controlled within a 6g precision range. The base 101 can be made of epoxy resin laminate (FR-4), and the insulating pin 110 can be made of polytetrafluoroethylene rod or glass fiber reinforced nylon (PA66-GF30). During machining, the insulating pin 110 is threaded using a CNC lathe, with a thread angle of 60 degrees and a pitch error of less than ±0.02 mm. The internal thread of the through hole 106 is formed by tapping. Before tapping, a pre-drilled hole diameter of 5.1 mm (M6 thread) or 6.8 mm (M8 thread) is used. After tapping, a thread gauge is used to check if the go / no-go gauge is qualified.

[0056] The spring 1101, located at the top of the insulating pin 110, has a free length of 10 to 15 mm, a wire diameter of 1 to 1.2 mm, and an outer diameter of 8 to 10 mm. It is made of 304 stainless steel. During installation, the spring 1101 is pre-compressed by 3 to 5 mm, generating an initial preload of 15 N to 25 N. When screwing in the insulating pin 110, a torque wrench is used to control the tightening torque to 1.5 N·m to 2.5 N·m, ensuring that the bottom surface of the spring 1101 evenly presses against the top surface of the base 101.

[0057] The inner wall of the pre-drilled mounting hole in generator stator slot 301 is coated with epoxy resin adhesive (such as 3M DP460) to a thickness of 0.1 mm to 0.3 mm, with the coating length covering 120% of the effective thread length. When the insulating pin 110 is screwed in, the gap between the external thread 1102 and the inner wall of the pre-drilled hole is 0.05 mm to 0.1 mm. The adhesive is squeezed into the gap between the thread crests through thread engagement. After curing, the installation is complete. After installation, an axial tensile force of 50 N is applied for testing. The displacement must be less than 0.05 mm, and the insulation resistance test value must be ≥1×10⁻⁶. 13 Ω.

[0058] Further preferred, such as Figure 1As shown, the insulating pin 110 is inserted into the mounting hole at an angle downwards, biased towards the inside of the stator slot, rather than perpendicular to the base plane. Specifically, the axis of the insulating pin forms an angle of 5 to 10 degrees with the base plane, with the tilt direction pointing towards the center line of the inside of the stator slot. The axis of the internal thread of the base through hole is tilted at the same angle, and the tilt angle is controlled within ±0.2 degrees by a five-axis CNC machine tool. The axis of the pre-drilled hole in the stator slot is kept parallel to the axis of the insulating pin, and a magnetic drill with an angle positioning function is used for drilling. The drill bit guide sleeve has an adjustable angle gauge of 3 to 12 degrees built in. The external thread profile of the insulating pin is modified to a 30-degree asymmetrical trapezoidal thread, and the angle of the tooth surface on the force side is reduced to 25 degrees to improve shear resistance. When screwing in the insulating pin, an electric torque wrench with a universal joint head is used to keep the tool axis consistent with the tilt angle of the insulating pin. The installation position of the compression spring is offset 2 to 3 mm towards the inside of the stator slot to ensure uniform pressure distribution between the bottom surface of the compression spring and the top surface of the base. After curing, a lateral force was applied using a shear force tester, and the shear strength of the insulating pin in the inclined state was tested to be ≥150N. The inclined installation reduced the vibration directional force on the insulating pin by 30% to 40%. After installation, a laser displacement sensor was used to detect the axial displacement of the inclined installation structure under 50Hz lateral vibration conditions, which was ≤0.03mm, an improvement of 45% compared to the vertical installation.

[0059] Furthermore, in another embodiment, the signal line of this utility model is led out from the base 101 and passes through the galvanized cable pipe and the plastic-coated metal flexible hose in sequence until it is led out of the generator. The connection between the galvanized cable pipe and the plastic-coated metal flexible hose is provided with a rubber sheath.

[0060] Specifically, galvanized cable conduits can be made of cold-galvanized steel pipe with an outer diameter of 20 mm and a wall thickness of 1.5 mm. The zinc coating thickness is 8 to 12 micrometers. The length is cut according to the distance from the base to the junction box, and each section should not exceed 1.5 meters. PVC-coated flexible metal conduits can be made of 304 stainless steel corrugated pipe with an inner diameter of 18 mm and an outer PVC coating, with a bending radius ≥ 150 mm. A 10 to 15 mm straight pipe section is reserved at the connection between the galvanized pipe and the flexible conduit, and the surface roughness Ra is ≤ 6.3 μm. The end of the galvanized pipe near the base is fixed with an M20×1.5 threaded connector, and the threaded joint is sealed with 3 turns of PTFE tape. The rubber sheath has an inner diameter of 19 mm, an outer diameter of 25 mm, and a wall thickness of 3 mm. The material can be EPDM or neoprene rubber, with a Shore hardness of 60A±5. During installation, insert 15 mm of galvanized pipe and hose into each end of the sheath, heat it to 120°C with a hot air gun to soften the rubber, and then press it tightly. At the same time, use stainless steel hose clamps to lock it at both ends.

[0061] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be easily made by those skilled in the art.

Claims

1. A fixing device for a generator stator slot leakage flux sensor, characterized by, include: Sensor, base, insulating pin, and signal cable; The base is a rectangular insulating plate with a protrusion on its bottom surface. The protrusion fits into the generator stator slot. The two sides of the protrusion are provided with positioning grooves that match the shape of the stator slot sidewall. The top surface of the base is provided with a slot for fixing the sensor and a cable routing groove. There are four through holes at the four corners of the base. Insulating pins are inserted into the through holes, and the diameter of the insulating pins is fitted with the inner diameter of the through holes with clearance. The sensor is fixed to the base by a slot, and the sensor signal line is led out from the cable routing channel, which is filled with silicone. The base is fixed to the stator slot by an insulating pin passing through the through hole. The stator slot has a mounting hole at the corresponding position, and adhesive is injected into the mounting hole.

2. The fixing device for the leakage flux sensor in the generator stator slot according to claim 1, characterized in that, The positioning groove of the base is provided with several protrusions, and the extension direction of the protrusions is consistent with the length direction of the stator slot line. After the protrusion of the base is embedded into the stator slot line, one side of the protrusion contacts the side wall of the stator slot line to achieve pre-positioning, and then is fixed by the cooperation of the insulating pin with the pre-drilled mounting hole.

3. The stator slot leakage flux sensor fixture for a generator of claim 1, wherein, The cross-section of the raised strip is trapezoidal or rectangular, and several raised strips are arranged in parallel at intervals to form intervals, which are filled with elastic insulating and thermally conductive material.

4. The stator slot leakage flux sensor fixture for a generator of claim 1, wherein, The base has an elastic pressure plate in the cable routing channel; the fixed end of the elastic pressure plate is fixed to the side wall of the cable routing channel, and the free end of the elastic pressure plate is bent toward the center of the cable routing channel at a bending angle of 45 degrees. The end of the elastic pressure plate is provided with an arc-shaped groove, the radius of which matches the outer diameter of the cable; The signal line passes through the arc-shaped groove of the splitter clamp, and the elastic pressure plate presses the cable tightly against the side wall of the cable routing channel.

5. The stator slot leakage flux sensor fixture for a generator of claim 1, wherein, The inner wall of the through hole of the base is provided with internal thread, and the outer surface of the insulating pin is provided with external thread that matches the internal thread; a compression spring is provided at the top of the insulating pin. When the insulating pin is screwed into the through hole, the external thread and the internal thread mesh, and the bottom surface of the compression spring presses against the top surface of the base; the inner wall of the pre-drilled hole of the stator slot is coated with epoxy resin adhesive, and the adhesive fills the thread gap after the insulating pin is screwed into the pre-drilled hole.

6. The stator slot leakage flux sensor fixture for a generator of claim 1, wherein, After the signal cable is led out from the base, it passes through the galvanized cable conduit and the plastic-coated metal flexible conduit in sequence. The connection between the galvanized cable conduit and the plastic-coated metal flexible conduit is equipped with a rubber sheath.

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