A kind of core mineral insulated cable based on segmented limiting fixed wire structure

Abstract

The present application relates to the technical fields of electric wire and cable, and discloses a kind of based on segmented limit fixed wire structure's reactor mineral insulated cable, including wire core, sheath, the wire core is filled with mineral filler between sheath, the wire core includes wire, the circumferential outer surface of wire is equipped with mineral insulation layer, the sheath is provided with fixed structure by the sliding slot being opened in its outer surface;Wherein, the fixed structure includes the inner snap ring of the circumferential outer periphery of sheath, the circumferential inner surface of inner snap ring is fixedly connected with sliding block.The reactor mineral insulated cable based on segmented limit fixed wire structure, can effectively solve the problem in the prior art, the sheath of traditional mineral insulated cable is usually smooth metal tubular structure, body does not have the fixed wire installation characteristics of self, external clamp is difficult to position on smooth cable sheath, clamp is easy to shift relative to sheath, causes cable limiting failure.

Description

Technical Field

[0001] This invention relates to the field of wire and cable technology, and specifically to a mineral-insulated cable with a core based on a segmented limiting and fixing structure. Background Technology

[0002] Mineral-insulated cables are special cables that use inorganic mineral powders such as magnesium oxide and aluminum oxide as the insulating medium and a metal sheath as the protective layer. They have outstanding advantages such as high temperature resistance, flame retardancy, radiation resistance, and long service life. They are widely used in nuclear power reactor cores, metallurgy, petrochemicals, and high-rise buildings where fire protection and reliability requirements are high.

[0003] In existing technologies, during reactor operation, the fluid excitation force generated by the flow of coolant, the impact load generated by the movement of control rods, and the thermal expansion and contraction caused by temperature changes can all cause the cable to vibrate and displace. Traditional mineral-insulated cables typically have a smooth metal tubular sheath and do not have built-in cable fixing features. External clamps are difficult to position on the smooth cable sheath, and the clamps are prone to displacement relative to the sheath, causing the cable's limiting function to fail. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a reactor core mineral-insulated cable based on a segmented limiting and fixing structure. This effectively solves the problems in existing technologies where, during reactor operation, fluid excitation forces generated by coolant flow, impact loads generated by control rod movement, and thermal expansion and contraction caused by temperature changes all cause cable vibration and displacement. Traditional mineral-insulated cables typically have a smooth metal tubular sheath and lack built-in fixing and installation features. External clamps are difficult to position on the smooth cable sheath, and the clamps are prone to displacement relative to the sheath, leading to cable limiting failure.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a mineral-insulated cable with a segmented limiting and fixing structure, comprising a core and a sheath, wherein a mineral filler is filled between the core and the sheath, the core includes a conductor, and a mineral insulation layer is sleeved on the outer circumference of the conductor, and the sheath is fixed by a groove formed on its outer surface.

[0007] The fixing structure includes an inner retaining ring sleeved around the circumference of the sheath. A slider is fixedly connected to the inner surface of the inner retaining ring, and the outer surface of the slider slides against the inner wall of the groove. Multiple inner retaining rings are provided and spaced apart along the extension direction of the sheath. A fixing block is fixedly connected inside the inner retaining ring, and a mounting plate is fixedly connected to the outer side of the fixing block. The mounting plate has a mounting hole inside, and bolt holes are provided through the fixing block and the mounting plate. Screws that fit against the inner wall surface of the groove are threaded into the bolt holes. An adjusting element is provided in the inner retaining ring through an annular groove on its outer circumference.

[0008] Furthermore, the wire cores are provided in a plurality of such a plurality of wire cores, which are distributed in a ring-shaped interval around the axis of the sheath.

[0009] Furthermore, the adjusting component includes an outer ring rotatably connected to the inner wall of the annular groove, the axis of the outer ring coincides with the axis of the inner retaining ring, a shaft is fixedly connected to the outer side of the outer ring, and a connecting rod is hinged between the shafts of two adjacent outer rings.

[0010] Furthermore, a connecting block is fixedly connected to the outer periphery of the outer ring, an arc-shaped groove is provided inside the connecting rod, and a circular ring passing through the arc-shaped groove is fixedly connected to the side of the connecting block away from the outer ring.

[0011] Furthermore, the ring is slidably connected to a limiting post through a limiting groove formed on its outer surface. A reciprocating ring is fixedly connected to the outer end of the limiting post, and a spring connected to the inner side of the reciprocating ring is sleeved on the outer circumference of the limiting post.

[0012] Furthermore, the upper surface of the reciprocating ring is provided with locking teeth, and the inner wall of the arc-shaped groove is provided with a locking groove on the side near the reciprocating ring.

[0013] Furthermore, the mounting plate has an internal cavity that communicates with the bolt hole. A wedge block one and a wedge block two are slidably connected inside the cavity. The wedge block one slides axially along the bolt hole, and the wedge block two slides radially along the bolt hole. The wedge block one and the wedge block two are perpendicularly distributed and abut against each other through an inclined surface. An abutment block is fixedly connected to the side of the wedge block two near the outer ring. A tension spring connected to the inner wall of the cavity is provided on the side of the wedge block two away from the abutment block. The axial sliding of the wedge block one can drive the wedge block two to slide radially through the compression of the inclined surface. The end of the wedge block one away from its inclined surface is in contact with the side of the screw head near the cavity.

[0014] Furthermore, the outer ring has friction protrusions on its side, and the abutment block has a friction groove on the side away from the second wedge.

[0015] The technical solution provided by this invention has the following advantages compared with the prior art:

[0016] 1. This invention features a through-groove along the axial direction on the outer surface of the sheath. A slider is installed inside the inner retaining ring, slidingly engaging with the groove. The inner diameter of the inner retaining ring is larger than the outer diameter of the sheath, allowing the entire fixing structure to slide and adjust freely along the cable's extension direction. Multiple sets of inner retaining rings can be moved and arranged at stress points in curved and straight sections according to the actual cable laying configuration, achieving segmented and uniform positioning. This effectively improves stress concentration in curved sections of the cable, enhancing the overall support uniformity and structural stability of the cable.

[0017] 2. This invention features an outer ring and connecting rods. The outer ring can rotate relative to the inner retaining ring. The outer ring is hinged to the connecting rod via a shaft fixed to its outer surface. The connecting rod can achieve angular oscillation through an arc-shaped groove cooperating with the ring. This allows for the uniform adjustment of multiple sets of connecting rods to the same horizontal plane where the cable bends, based on different laying configurations such as left-right bends, front-back bends, and multi-angle arc bends. This ensures that the connecting rod support structure always conforms to the cable bending plane. This invention can adapt to differences in bending angles, avoid damage from hard compression, and effectively protect the sealing integrity of the seamless alloy sheath.

[0018] 3. The present invention is provided with wedge block one and wedge block two. Through a single set of screw locking actions, two locking functions can be achieved simultaneously: first, the screw end presses against the inner wall of the slide groove to lock the axial relative position of the inner retaining ring and the cable sheath, preventing the fixed structure from slipping or moving relative to the cable sheath; second, the inclined surfaces of wedge block one and wedge block two drive the abutment block to press against the friction protrusion of the outer ring, thereby achieving rigid locking of the rotation angle of the outer ring and preventing the outer ring from vibrating and rotating.

[0019] 4. The present invention provides multiple sets of fixed structures arranged at intervals along the cable extension direction to form a full-area segmented limiting support. In the vertical section of the cable, multiple inner retaining rings and outer rings are arranged in a linear array along the axial direction. Under the action of the spring, the retaining teeth at the outer end of the reciprocating ring engage with the retaining groove. The included angle between two adjacent connecting rods is 180 degrees, and the multiple inner retaining rings and outer rings are kept in a state of linear array distribution along the axial direction. In the cable bending section, multiple inner and outer rings are distributed along the cable bending path. After the position is adjusted and stabilized, the retaining teeth at the outer end of the reciprocating ring engage with the retaining groove under the action of the spring, locking the angle of the inner and outer rings at adjacent positions. The bending section of the mineral insulated cable is the weakest area with the most concentrated stress and the weakest vibration resistance of the entire cable. It is also the main stress point of fluid impact and alternating vibration. Traditional fixing structures cannot meet the precise fitting and fixing of different bending arc shapes, and are prone to problems such as the bending section being suspended and the support being missing. This invention can deploy the fixing structure to the cable bending section through sliding adjustment. With the circumferential rotation of the outer ring and the multi-angle hinge of the connecting rod for adaptive angle adjustment, it can completely fit the cable bending arc contours with different curvatures and orientations, forming a full-coverage fitting segmented support for the bending section. It can effectively share the cantilever bending moment and vibration load of the bending section, avoid fatigue cracks and local depression damage of the alloy sheath caused by long-term stress accumulation in the bending section, and at the same time restrain the slight sway of the bending section, eliminate the problem of loosening and voiding of the internal mineral insulation powder of the bending section caused by vibration, stabilize the insulation performance of the bending section, and solve the problems of easy damage, insulation failure and short service life of cable bending sections in the existing technology. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the sheath, groove, and fixing structure according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the internal retaining ring, fixing block, mounting plate, and adjusting component in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the mounting plate, inner retaining ring, and outer ring in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the separation structure of the inner retaining ring, outer ring, and connecting rod in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the separated structure of the ring, spring, and reciprocating ring according to an embodiment of the present invention;

[0027] Figure 7 This is a cross-sectional structural diagram of the wire core, sheath, inner retaining ring, and outer ring according to an embodiment of the present invention;

[0028] Figure 8 This is an embodiment of the present invention. Figure 7 A magnified structural diagram of part A in the middle;

[0029] Figure 9 This is an embodiment of the present invention. Figure 7 A magnified structural diagram of section B in the middle.

[0030] The labels in the diagram represent: 1. Core wire; 11. Conductor wire; 12. Mineral insulation layer; 2. Sheath; 21. Slide groove; 3. Mineral filler; 4. Fixing structure; 41. Inner retaining ring; 411. Ring groove; 42. Slider; 43. Fixing block; 431. Bolt hole; 432. Receiving cavity; 44. Mounting plate; 45. Screw; 46. Adjusting component; 461. Outer ring; 4611. Friction tooth; 462. Shaft; 463. Connecting rod; 4631. Arc groove; 4632. Slot; 464. Connecting block; 465. Circular ring; 466. Limiting post; 467. Reciprocating ring; 4671. Retaining tooth; 468. Spring; 471. Wedge one; 472. Wedge two; 473. Abutment block; 4731. Friction groove; 474. Tension spring. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] The present invention will be further described below with reference to embodiments.

[0033] Example:

[0034] Please see Figures 1-9 The present invention provides a technical solution: a mineral-insulated cable with a core based on a segmented limiting and fixing structure, including a core 1 and a sheath 2, with a mineral filler 3 filling the space between the core 1 and the sheath 2, the core 1 including a conductor 11, a mineral insulation layer 12 covering the outer circumference of the conductor 11, and the sheath 2 having a fixing structure 4 provided by a groove 21 opened on its outer surface.

[0035] The fixing structure 4 includes an inner retaining ring 41 sleeved around the circumference of the sheath 2. The inner diameter of the inner retaining ring 41 is larger than the outer diameter of the sheath 2. A slider 42 is fixedly connected to the inner circumference of the inner retaining ring 41. The outer surface of the slider 42 slides against the inner wall of the groove 21. Multiple inner retaining rings 41 are provided and are spaced apart along the extension direction of the sheath 2. A fixing block 43 is fixedly connected inside the inner retaining ring 41. A mounting plate 44 is fixedly connected to the outer side of the fixing block 43. The mounting plate 44 has a mounting hole inside. Bolt holes 431 are provided through the fixing block 43 and the mounting plate 44. Screws 45 that fit against the inner wall surface of the groove 21 are threaded inside the bolt holes 431. An adjusting member 46 is provided in the inner retaining ring 41 through an annular groove 411 on its outer circumference.

[0036] Several cores 1 are provided, and the cores 1 are distributed in a ring with the axis of the sheath 2 as the center.

[0037] The adjusting member 46 includes an outer ring 461 that is rotatably connected to the inner wall of the ring groove 411. The axis of the outer ring 461 coincides with the axis of the inner retaining ring 41. A shaft 462 is fixedly connected to the outer side of the outer ring 461. A connecting rod 463 is hinged between the shafts 462 of two adjacent outer rings 461.

[0038] A connecting block 464 is fixedly connected to the outer periphery of the outer ring 461. An arc-shaped groove 4631 is opened inside the connecting rod 463. A circular ring 465 passing through the arc-shaped groove 4631 is fixedly connected to the side of the connecting block 464 away from the outer ring 461.

[0039] The ring 465 is slidably connected to the limiting post 466 through the limiting groove formed on its outer surface. The outer end of the limiting post 466 is fixedly connected to the reciprocating ring 467. The outer circumference of the limiting post 466 is fitted with a spring 468 that is connected to the inner side of the reciprocating ring 467.

[0040] The upper surface of the reciprocating ring 467 is provided with a retaining tooth 4671, and the inner wall of the arc groove 4631 is provided with a retaining groove 4632 on the side near the reciprocating ring 467.

[0041] The mounting plate 44 has an internal cavity 432 that communicates with the bolt hole 431. Wedge 1 471 and wedge 2 472 are slidably connected in the cavity 432. Wedge 1 471 slides axially along the bolt hole 431, and wedge 2 472 slides radially along the bolt hole 431. Wedge 1 471 and wedge 2 472 are perpendicularly distributed and abut against each other through an inclined surface. A stop block 473 is fixedly connected to the side of wedge 2 472 near the outer ring 461. A tension spring 474 connected to the inner wall of the cavity 432 is provided on the side of wedge 2 472 away from the stop block 473. The axial sliding of wedge 1 471 can drive wedge 2 472 to slide radially through the pressure of the inclined surface. The end of wedge 1 471 away from its inclined surface is in contact with the side of the screw head near the cavity 432.

[0042] The outer ring 461 has friction protrusions 4611 on its side, and the abutment block 473 has a friction groove 4731 on the side away from the wedge block 472.

[0043] The mineral-insulated cable of the present invention mainly comprises four parts from the inside out: conductor 1, mineral filler 3, sheath 2, and fixing structure 4. Several conductors 1 are arranged in a ring-shaped distribution around the axis of the sheath 2. In this embodiment, there are five conductors 1, evenly arranged to ensure uniform stress on the cable cross-section. Each conductor 1 includes a conductor 11, which is made of high-purity copper or copper alloy. A mineral insulation layer 12 is sleeved on the outer circumference of the conductor 11.

[0044] The gaps between several conductors 1 and the sheath 2 are densely filled with mineral filler 3. The mineral filler 3 is made of the same or similar material as the mineral insulation layer 12. After high-temperature sintering, it forms an integral and dense structure with the mineral insulation layer 12 and the inner wall of the sheath 2, which not only achieves electrical isolation between conductors 1, but also provides radial support for conductors 1, preventing displacement of conductors 1 when the cable is bent or compressed. The sheath 2 is made of stainless steel or nickel-based alloy, which has the characteristics of corrosion resistance, high temperature resistance, and radiation resistance, and can effectively protect the internal conductors 1 and mineral filler 3 from the influence of the core stack environment. A groove 21 is formed along the entire axial length of the outer circumference surface of the sheath 2. The groove 21 is formed through the sheath 2 along the axial direction, providing sliding guidance and circumferential limit for the fixing structure 4.

[0045] The sheath 2 is fitted with a fixing structure 4 via a groove 21 on its outer surface. An inner retaining ring 41 in the fixing structure 4 is fitted around the circumference of the sheath 2. The structure can be a split ring, formed by two halves joined together. The inner diameter of the inner retaining ring 41 is larger than the outer diameter of the sheath 2, allowing it to slide freely along the axial direction of the sheath 2. A slider 42 is fixedly connected to the inner circumference of the inner retaining ring 41. When the inner retaining ring 41 is fitted around the outer circumference of the sheath 2, the slider 42 engages with the groove 21, preventing the inner retaining ring 41 from rotating circumferentially around the sheath 2, thus achieving circumferential limiting of the inner retaining ring 41. Multiple inner retaining rings 41 are provided, spaced apart along the extension direction of the sheath 2.

[0046] A fixing block 43 is fixedly connected inside the inner retaining ring 41. The fixing block 43 is located at the radial center of the inner retaining ring 41 and has a block-shaped structure. A mounting plate 44 is fixedly connected to the outer side of the fixing block 43, i.e., the side away from the sheath 2. The mounting plate 44 has a plate-shaped structure, and its surface is fixedly connected to the end face of the fixing block 43. A bolt hole 431 is provided through the interior of the fixing block 43 and the mounting plate 44. The bolt hole 431 is a threaded through hole, and its axis extends radially along the sheath 2. A screw 45 is threadedly connected inside the bolt hole 431. The end of the screw 45 passes through the bolt hole 431 and fits against the inner wall surface of the slide groove 21. When the screw 45 is tightened, the end of the screw 45 presses against the inner wall of the slide groove 21, so that the inner retaining ring 41 is fixed relative to the sheath 2. When the screw 45 is loosened, the end of the screw 45 disengages from the inner wall of the slide groove 21, and the inner retaining ring 41 can slide axially along the sheath 2 to adjust its position.

[0047] An annular groove 411 is formed on the outer circumference of the inner retaining ring 41. The annular groove 411 is an annular groove along the outer circumference of the inner retaining ring 41. An adjusting member 46 is provided in the annular groove 411 through the annular groove 411. The adjusting member 46 is fitted inside the annular groove 411 and can rotate around the axis of the inner retaining ring 41. Its function is to meet the fixing requirements of the cable at different bending directions and bending angles. The adjusting member 46 includes an outer ring 461, a shaft 462, and a connecting rod 463. The outer ring 461 is fitted inside the annular groove 411 of the inner retaining ring 41. The inner wall of the outer ring 461 is rotatably connected to the inner wall of the annular groove 411, that is, the outer ring 461 can rotate freely around the axis of the inner retaining ring 41 within the annular groove 411. The axis of the outer ring 461 coincides with the axis of the inner retaining ring 41, ensuring that the outer ring 461 will not wobble eccentrically when rotating. A shaft 462 is fixedly connected to the outer side of the outer ring 461, i.e., the side away from the inner retaining ring 41. The shaft 462 is a cylindrical rod whose axis extends radially along the outer ring 461. A connecting rod 463 is hinged between the shafts 462 of two adjacent outer rings 461. The two ends of the connecting rod 463 are respectively hinged to the shafts 462 on the two adjacent outer rings 461.

[0048] A connecting block 464 is fixedly connected to the outer circumference of the outer ring 461. The connecting block 464 is a block-shaped structure protruding from the outer surface of the outer ring 461, and a circular ring 465 is fixedly connected to the side of the connecting block away from the outer ring 461. An arc-shaped groove 4631 is formed inside the connecting rod 463 along its length. The arc-shaped groove 4631 is a long strip-shaped through groove, and its center line is an arc with the hinge point of the shaft 462 as the center. The circular ring 465 passes through the interior of the arc-shaped groove 4631, allowing the circular ring 465 to slide along the groove within the arc-shaped groove 4631. When the connecting rod 463 swings around the shaft 462, the circular ring 465 slides relative to the connecting rod 463 within the arc-shaped groove 4631.

[0049] A ring 465 is slidably connected to a limiting post 466 via a limiting groove formed on its upper surface. The limiting groove is a blind hole extending axially along the ring 465. The limiting post 466 is a cylindrical rod whose lower end is inserted into the limiting groove and can slide axially along the limiting groove. A reciprocating ring 467 is fixedly connected to the outer end of the limiting post 466. The reciprocating ring 467 is an annular piece set on the upper end of the limiting post 466, and its area is the same as that of the ring 465. A spring 468 is fitted on the outer circumference of the limiting post 466. The spring 468 is a compression spring, whose upper end is connected to the inner side, i.e., the lower surface, of the reciprocating ring 467, and its lower end abuts against the upper surface of the ring 465. In its natural state, the elastic force of the spring 468 pushes the reciprocating ring 467 upward, keeping the reciprocating ring 467 in its upper limit position. The upper surface of the reciprocating ring 467 is provided with locking teeth 4671, which are multiple tooth-shaped protrusions spaced apart along the circumference of the reciprocating ring 467. A groove 4632 is provided on the inner wall of the arc-shaped groove 4631 near the reciprocating ring 467. The groove 4632 is a tooth-shaped groove that matches the shape of the locking teeth 4671, and its number corresponds to the number of locking teeth 4671. When the reciprocating ring 467 moves upward under the action of the spring 468 until it abuts against the inner wall of the arc-shaped groove 4631, the locking teeth 4671 and the groove 4632 engage with each other.

[0050] When the reciprocating ring 467 is not subjected to external force, it moves upward under the action of the spring 468 until it abuts against the inside of the groove 4632 on the inner wall of the arc groove 4631. When the reciprocating ring 467 is compressed by external force, the reciprocating ring 467 drives the limiting post 466 to press into the limiting groove. After being compressed, the spring 468 is in a compressed state. At this time, there is a gap between the outer surface of the reciprocating ring 467 and the end of the inner wall of the arc groove 4631. The retaining teeth 4671 on the outer surface of the reciprocating ring 467 no longer abut against the inside of the groove 4632 on the inner wall of the arc groove 4631. At this time, the connecting rod 463 can rotate relative to the shaft 462, so that the two adjacent inner retaining rings 41 can slide in accordance with the bend.

[0051] The mounting plate 44 has an internal cavity 432 that communicates with the bolt hole 431. The cavity 432 is a hollow space within the mounting plate 44, located on the side wall of the bolt hole 431 head and communicating with it. A first wedge 471 and a second wedge 472 are slidably connected within the cavity 432. The sliding direction of the first wedge 471 extends axially along the bolt hole 431, meaning it can slide axially within the cavity 432. The sliding direction of the second wedge 472 extends radially along the bolt hole 431, meaning it can slide radially within the cavity 432. The first and second wedges 471 are perpendicularly distributed and abut against each other via inclined surfaces. Specifically, the end of the first wedge 471 has a first inclined surface, and the corresponding position of the second wedge 472 has a second inclined surface that matches the first inclined surface. The first and second inclined surfaces are in close contact.

[0052] A stop block 473 is fixedly connected to the side of wedge 472 near the outer ring 461, with its end extending out of the receiving cavity 432 and facing the outer ring 461. A tension spring 474 is provided on the side of wedge 472 away from the stop block 473. One end of the tension spring 474 is connected to the inner end of wedge 472 near the second inclined surface, and the other end is connected to the inner wall side of the receiving cavity 432. In its natural state, the tension of the tension spring 474 pulls wedge 472 away from the outer ring 461, causing the stop block 473 to retract into the receiving cavity 432, keeping the outer ring 461 free to rotate. The outer end of wedge 471 away from its inclined surface is in contact with the head of screw 45 near the receiving cavity 432. The diameter of the screw head is larger than the diameter of the locking section of screw 45, so that when screw 45 is screwed into bolt hole 431, the head presses against the outer end of wedge 471.

[0053] When the operator tightens screw 45 with a tool, screw 45 moves inward along the bolt hole 431 axially. The head of screw 45 pushes wedge 471 to slide inward along the bolt hole 431 axially. During the inward sliding process of wedge 471, its first inclined surface presses against the second inclined surface of wedge 472. Since wedge 472 can only slide radially, the pressing force of the inclined surface is decomposed into a radial component. This radial component drives wedge 472 to slide radially outward along the bolt hole 431, i.e., towards the outer ring 461.

[0054] When wedge 472 extends radially outward, it drives abutment block 473 to extend synchronously outward. The end of abutment block 473 finally abuts against the friction protrusion 4611 on the side of outer ring 461, pressing and fixing outer ring 461 into the annular groove 411 of inner retaining ring 41, preventing outer ring 461 from rotating around inner retaining ring 41, thus achieving radial locking between outer ring 461 and inner retaining ring 41. The inclined surfaces of wedge 471 and wedge 472 have a force-increasing effect. Under the same screw 45 tightening torque, the radial locking force of abutment block 473 on outer ring 461 is much greater than the locking force of screw 45 directly pressing against the inner wall of slide groove 21, significantly improving locking reliability. When it is necessary to loosen outer ring 461 to adjust its position, the operator loosens screw 45 in the opposite direction. The head of screw 45 disengages from the outer end of wedge 471, and wedge 471 loses axial thrust. At this point, the tension of the tension spring 474 pulls the second wedge 472 back away from the outer ring 461. The second wedge 472, through the inclined surface, drives the first wedge 471 to reset axially outward. The abutment block 473 retracts into the receiving cavity 432 along with the second wedge 472, and the outer ring 461 is released, allowing it to rotate again around the inner retaining ring 41 for position adjustment. This release process requires no additional operation; the tension spring 474 automatically completes the reset, making the operation simple.

[0055] Before cable laying and installation, the cable is in a straight, upright state, and the fixing structure 4 is located at one end of the cable. In actual installation, the cable needs to be bent, resulting in a curved section. The fixing structure 4 is provided in several groups, each group containing multiple inner retaining rings 41. In the initial state, the multiple inner retaining rings 41 and outer rings 461 are linearly arrayed. Under the action of spring 468, the retaining teeth 4671 on the outer surface of the reciprocating ring 467 engage with the retaining grooves 4632 on the inner wall of the arc-shaped groove 4631. The included angle between the two connecting rods 463 hinged to the outer surface of the same shaft 462 is 180 degrees. At this time, screw 45 is in an unlocked installation state. Under the action of tension spring 474, wedge 472 is in a retracted state, located on the side away from inner retaining ring 41 within its stroke range. At the same time, the abutment block 473 on the outer side of wedge 472 is separated from the friction protrusion 4611 on the side of outer ring 461, and outer ring 461 can rotate relative to the outer surface of inner retaining ring 41. When the fixing structure 4 is located in the straight section of the cable, the multiple connecting rods 463 on the outer surface of outer ring 461 can be located on any side of the periphery of inner retaining ring 41.

[0056] After the cable is bent, a set of fixing structures 4 is moved to the bending point along the slide groove 21. Before moving, the angle of the connecting rods 463 in the multiple adjusting parts 46 of the fixing structure 4 relative to the outer side of the inner retaining ring 41 is adjusted. When the cable is vertically distributed and its top bends to the left or right, the outer ring 461 and connecting rods 463 need to be kept in front of the sheath 2, that is, with the inner retaining ring 41 as the center, the connecting rods 463 and the mounting plate 44 are symmetrically distributed. This ensures that the multiple connecting rods 463 are always in the same horizontal plane. When the cable is vertically distributed and its top bends to the front or back, the outer ring 461 and connecting rods 463 need to be kept to the left or right side of the sheath 2, that is, the connecting rods 463 and the mounting plate 44 are distributed at a 90-degree angle with the axis of the inner retaining ring 41 as the center. This ensures that the multiple connecting rods 463 are always in the same horizontal plane. When the fixed structure 4 moves to the curved section, the reciprocating ring 467 needs to be pressed, and the spring 468 is compressed. The retaining teeth 4671 on the outer surface of the reciprocating ring 467 separate from the retaining groove 4632 in the arc groove 4631, so that when the inner retaining ring 41 and the outer ring 461 move, the connecting rod 463 on the outer surface of the shaft 462 can be rotated and hinged. After the movement is completed, the inner retaining rings 41 at both ends of the fixed structure 4 are placed outside the straight section of the sheath 2.

[0057] After the fixing structure 4 is moved to its required position, the relative position of the inner retaining ring 41 and the outer surface of the sheath 2 needs to be fixed to prevent the inner retaining ring 41 from sliding along the axial direction of the sheath 2. The screw 45 is installed in the bolt hole 431 and tightened. The screw 45 is a flat-bottomed screw, and its flat end fits against the inner wall of the groove 21, locking the relative position of the inner retaining ring 41. Simultaneously, when the screw 45 is tightened, the side of the screw head near the receiving cavity 432 fits against the outer end of the wedge block 471, and after being pressed, the inclined surface causes the abutment block 473 to fit tightly against the friction protrusion 4611 on the side of the outer ring 461, thus fixing the relative position of the inner retaining ring 41 and the outer ring 461.

[0058] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mineral-insulated cable with a core based on a segmented limiting and fixing structure, characterized in that, Includes a wire core (1) and a sheath (2), with a mineral filler (3) filling the space between the wire core (1) and the sheath (2). The wire core (1) includes a conductor (11), and a mineral insulation layer (12) is provided on the outer circumference of the conductor (11). The sheath (2) is provided with a fixing structure (4) through a groove (21) opened on its outer surface. The fixing structure (4) includes an inner retaining ring (41) sleeved and installed on the outer periphery of the sheath (2). A slider (42) is fixedly connected to the inner surface of the inner retaining ring (41). The outer surface of the slider (42) slides against the inner wall of the groove (21). Multiple inner retaining rings (41) are provided. Multiple inner retaining rings (41) are arranged at intervals along the extension direction of the sheath (2). A fixing block (43) is fixedly connected inside the inner retaining ring (41). A mounting plate (44) is fixedly connected to the outer side of the fixing block (43). Bolt holes (431) are provided through the fixing block (43) and the mounting plate (44). Screws (45) that fit against the inner wall surface of the groove (21) are threaded inside the bolt holes (431). An adjusting element (46) is provided in the inner retaining ring (411) opened on its outer circumference.

2. The mineral-insulated cable with a core based on a segmented limiting and fixing structure according to claim 1, characterized in that: The wire core (1) is provided in a plurality of such a plurality of wire cores (1) and the plurality of wire cores (1) are distributed in a ring-shaped interval with the axis of the sheath (2) as the center.

3. A mineral-insulated cable with a core based on a segmented limiting and fixing structure according to claim 1, characterized in that: The adjusting component (46) includes an outer ring (461) rotatably connected to the inner wall of the annular groove (411). The axis of the outer ring (461) coincides with the axis of the inner retaining ring (41). A shaft (462) is fixedly connected to the outer side of the outer ring (461), and a connecting rod (463) is hinged between the shafts (462) of two adjacent outer rings (461).

4. A mineral-insulated cable with a core based on a segmented limiting and fixing structure according to claim 3, characterized in that: A connecting block (464) is fixedly connected to the outer periphery of the outer ring (461), and an arc groove (4631) is opened inside the connecting rod (463). A circular ring (465) passing through the arc groove (4631) is fixedly connected to the side of the connecting block (464) away from the outer ring (461).

5. A mineral-insulated cable with a core based on a segmented limiting and fixing structure according to claim 4, characterized in that: The ring (465) is slidably connected to a limiting post (466) through a limiting groove on its outer surface. A reciprocating ring (467) is fixedly connected to the outer end of the limiting post (466). A spring (468) connected to the inner side of the reciprocating ring (467) is sleeved on the outer circumference of the limiting post (466).

6. A mineral-insulated cable with a core based on a segmented limiting and fixing structure according to claim 5, characterized in that: The upper surface of the reciprocating ring (467) is provided with a retaining tooth (4671), and the inner wall of the arc groove (4631) is provided with a retaining groove (4632) on the side near the reciprocating ring (467).

7. A mineral-insulated cable with a core based on a segmented limiting and fixing structure according to claim 4, characterized in that: The mounting plate (44) has an internal cavity (432) that communicates with the bolt hole (431). A wedge block 1 (471) and a wedge block 2 (472) are slidably connected in the cavity (432). The wedge block 1 (471) slides axially along the bolt hole (431), and the wedge block 2 (472) slides radially along the bolt hole (431). The wedge block 1 (471) and the wedge block 2 (472) are perpendicularly distributed. The wedge block 1 (471) and the wedge block 2 (472) abut against each other through an inclined surface. A stop block (473) is fixedly connected to the side of the wedge block 2 (472) near the outer ring (461). A tension spring (474) connected to the inner wall side of the cavity (432) is provided on the side of the wedge block 2 (472) away from the stop block (473).

8. A mineral-insulated cable with a core based on a segmented limiting and fixing structure according to claim 7, characterized in that: The outer ring (461) has friction protrusions (4611) on its side, and the abutment block (473) has a friction groove (4731) on the side away from the wedge block (472).

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