Ceramic insulation support and power cable connecting device

Abstract

The utility model relates to a ceramic insulation support and a power cable connecting device, the ceramic insulation support comprises a first ceramic insulation module and a second ceramic insulation module, the first ceramic insulation module is provided with a plurality of accommodating grooves used for accommodating cable wiring terminals; the second ceramic insulation module is provided with a plurality of accommodating grooves for accommodating cable wiring terminals; the first ceramic insulation module is connected with the second ceramic insulation module, and the accommodating groove of the first ceramic insulation module is communicated with the accommodating groove of the second ceramic insulation module to form an accommodating cavity for accommodating a cable wiring terminal. The long-term temperature resistance of the ceramic matrix material can reach more than 2000 DEG C and is far higher than that of plastic (approximately 120-200 DEG C), the structure is kept complete, not softened and not decomposed in a cable flame combustion (950-1000 DEG C, 3 h) test, reliable insulation and mechanical support can still be maintained in an extremely high temperature or fire environment, and the power supply safety of a power supply system is greatly improved.

Description

Technical Field

[0001] This utility model relates to a ceramic insulating bracket and a power cable connection device. Background Technology

[0002] With the continuous expansion of power system scale and the increasing density of cable laying, power cable connection devices, as key nodes for power transmission between main cables and branch cables, are directly related to the stable operation of the entire power equipment and the safety of personnel and property.

[0003] However, existing power cable connection devices generally have the following shortcomings:

[0004] The insulation supports and housings of existing power cable connection devices are mostly made of engineering plastics or glass fiber reinforced plastics, which can only meet the electrical insulation requirements for normal power supply at room temperature. They cannot meet the power supply requirements during fires or under local overload conditions. Their heat distortion temperature is usually in the range of 120 °C to 200 °C, which is far lower than the fire resistance standard for maintaining power supply for 3 hours at temperatures of 950 °C to 1000 °C during a fire. Once the support or housing softens or burns due to heat, it can easily lead to insulation failure, causing phase-to-phase short circuits, grounding faults, and even electrical fires. Utility Model Content

[0005] The primary objective of this invention is to provide a ceramic insulating bracket that meets electrical insulation requirements and has excellent high-temperature resistance.

[0006] The second objective of this invention is to provide a power cable connection device that can meet electrical insulation requirements and has excellent high-temperature resistance.

[0007] The primary objective of this invention is achieved as follows:

[0008] A ceramic insulation bracket includes a first ceramic insulation module and a second ceramic insulation module. The first ceramic insulation module has a plurality of receiving slots for accommodating cable terminals, and the second ceramic insulation module has a plurality of receiving slots for accommodating cable terminals.

[0009] The first ceramic insulation module and the second ceramic insulation module are connected, and the receiving groove of the first ceramic insulation module and the receiving groove of the second ceramic insulation module are connected to form a receiving cavity for accommodating cable terminals.

[0010] The ceramic matrix material has a long-term temperature resistance of over 2000 °C, far exceeding that of plastics (≈120–200 °C). In the cable flame burning test (950–1000 °C, 3 h), it maintains structural integrity, does not soften or decompose, and ensures that it can maintain reliable insulation and mechanical support in extreme high temperature or fire environments, greatly improving the power supply safety of the power supply system.

[0011] Ceramic materials inherently possess high dielectric strength and high volume resistivity, and are free of halogens and carbonization products. Even in high-temperature or humid environments, they do not generate conductive channels, ensuring stable insulation between cable terminals and between the cable and the outer casing, and reducing the risk of electrical insulation breakdown and electrical short circuits.

[0012] The first and second ceramic insulation modules have identical structures, are mirror images of each other, or are identical parts, and are produced using the same set of molds. This not only reduces mold costs but also simplifies installation due to their identical structure. During production and installation, the first and second ceramic insulation modules are simply connected to form a ceramic insulation support, reducing labor costs and error rates.

[0013] Under multiple harsh working conditions such as high temperature, fire and humidity, it can still maintain mechanical strength and insulation performance, eliminate the hidden dangers of plastic brackets such as flammability, thermal deformation and aging cracking, and reduce electrical failure and fire risk from the source.

[0014] The primary objective of this utility model can also be achieved by the following technical measures:

[0015] Furthermore, the first ceramic insulation module is provided with a retaining rib and a retaining groove, and the second ceramic insulation module is provided with a retaining rib and a retaining groove. The retaining rib of the first ceramic insulation module is inserted into the retaining groove of the second ceramic insulation module, and the retaining rib of the second ceramic insulation module is inserted into the retaining groove of the first ceramic insulation module, thereby realizing the connection of the first ceramic insulation module and the second ceramic insulation module into one unit.

[0016] No additional metal fasteners or adhesive materials are required during installation; the parts can be quickly aligned and snapped together, simplifying the on-site assembly process.

[0017] The ribs and slots form a mechanical engagement, which enhances the tensile and shear strength between modules, ensuring that they do not loosen under vibration or thermal expansion conditions, and improving the stability and durability of the connection.

[0018] Furthermore, the first ceramic insulation module has a retaining rib around its corresponding receiving groove and a retaining slot around its corresponding receiving groove; the second ceramic insulation module has a retaining rib around its corresponding receiving groove and a retaining slot around its corresponding receiving groove.

[0019] When the second ceramic insulation module approaches the first ceramic insulation module, the retaining rib automatically enters the corresponding slot, achieving precise alignment between the modules. This eliminates the need for repeated manual adjustments, significantly reducing assembly difficulty and labor intensity, and enabling convenient and reliable on-site installation.

[0020] Furthermore, the receiving groove is provided with baffles to prevent the cable terminals from becoming loose.

[0021] The retaining ribs and cable terminals form a mechanical barrier, ensuring that the cable terminals remain stably in the predetermined position for a long time and reducing contact resistance fluctuations.

[0022] Improve the reliability of equipment operation under harsh conditions and reduce the risk of arcing, overheating or failure caused by loose cable terminals.

[0023] Furthermore, the receiving groove has an opening on one side with the baffle rib, and an opening on the other side for connecting to another receiving groove of ceramic insulation module. The receiving groove also has the baffle rib on its top.

[0024] One-sided retaining rib prevents the cable terminal from retracting along the direction of insertion force, and top retaining rib prevents the cable terminal from tilting up, ensuring that the cable terminal is constrained in all three dimensions.

[0025] This ensures that the cable terminals remain firmly held within the housing cavity during module assembly and energized vibration, achieving higher vibration and oscillation resistance.

[0026] Furthermore, the first ceramic insulation module has five of the aforementioned receiving slots, and the second ceramic insulation module has five of the aforementioned receiving slots.

[0027] It meets the one-time branching requirements of common five-core cables (such as three-phase + ground wire + neutral wire), reducing the use of external accessories.

[0028] Furthermore, it also includes bolts and nuts. Both the first ceramic insulation module and the second ceramic insulation module have through holes to facilitate the bolts to pass through. The bolts pass through the through holes of the first ceramic insulation module and the second ceramic insulation module in sequence to connect the nuts, thereby locking the first ceramic insulation module and the second ceramic insulation module.

[0029] Tightening the bolts prevents the first and second ceramic insulation modules from separating, ensuring the overall structural integrity and long-term reliable operation of the insulation support.

[0030] The second objective of this utility model is achieved as follows:

[0031] A power cable connection device includes a cable terminal block and a high-temperature resistant housing. The cable terminal block is snapped into the receiving cavity of a ceramic insulating bracket, and the ceramic insulating bracket is disposed inside the high-temperature resistant housing. The high-temperature resistant housing has a main cable inlet and outlet and a branch cable inlet and outlet.

[0032] Each cavity of the ceramic insulating bracket securely holds the corresponding cable terminal, ensuring that each terminal is independently insulated, preventing short circuits between conductors, and maintaining stable insulation with the outer casing;

[0033] The exterior is encased in a high-temperature resistant metal or ceramic composite shell, which can withstand temperatures of ≥1000 °C during fires, preventing damage to internal insulation components and terminals from direct flames or heat radiation. This dual protection ensures fire-fighting power supply during fires.

[0034] The second objective of this utility model can also be achieved by the following technical measures:

[0035] Furthermore, the high-temperature resistant housing includes an upper housing and a lower housing, the upper housing being a metal upper housing and the lower housing being a metal lower housing, the upper housing and the lower housing being connected to form the high-temperature resistant housing.

[0036] Iron has a melting point of approximately 1538 °C, which is much higher than the cable flame test temperature (950–1000 °C). The casing remains structurally intact in a fire environment, without softening or burning, ensuring that critical internal components continue to be protected.

[0037] The metal casing has a natural shielding effect against external electromagnetic interference (EMI), which can reduce the impact of electromagnetic pulses generated by switching arcs or large current jumps on surrounding equipment; similarly, the casing also blocks the interference of strong external electromagnetic fields on connection points, improving the system's anti-interference capability.

[0038] The iron upper and lower housings not only enhance the mechanical and high-temperature protection capabilities of the power cable connection device, but also provide electromagnetic shielding, cost advantages, and ease of maintenance, further improving the reliability and practicality of the entire power cable connection system.

[0039] Furthermore, the cable terminal includes a base integrally formed from a high-strength conductive metal material that is not easily deformed under stress, a conductive metal sliding plate made of a highly conductive metal material, and a wire pressing metal plate;

[0040] The base is provided with a cable core receiving channel, and the base has an open opening that connects to the cable core receiving channel;

[0041] The conductive metal slide plate is provided with an upper arc-shaped opening and a lower arc-shaped opening. The conductive metal slide plate is movably placed in the cable core receiving channel. The lower arc-shaped opening and the bottom wall of the cable core receiving channel form a lower clamping cavity for clamping the cable core.

[0042] The wire pressing metal plate is provided with a height-adjustable wire pressing component. The wire pressing metal plate is detachably mounted on the base with a sealed opening. The wire pressing component faces the upper arc-shaped opening, and the wire pressing component and the upper arc-shaped opening form an upper clamping cavity for clamping the cable core.

[0043] The use of detachable wire clamping plates makes it easier to insert cable cores into the cable core receiving channel. The use of height-adjustable wire clamping components makes the cable core crimping process more convenient, significantly shortening installation time and improving work efficiency.

[0044] The upper and lower arc-shaped openings on the conductive metal sliding plate cooperate with the bottom wall of the cable core receiving channel and the pressure metal plate inside the base to form upper and lower clamping cavities, thereby achieving uniform and stable clamping of the cable core on both sides, ensuring good electrical contact and mechanical fixation.

[0045] The conductive metal sliding plate is small in size, reducing the space it occupies in the cable core receiving channel. This ensures that the cable core does not protrude outside the receiving channel after it enters, making it easier for users to install the wire clamping metal plate and thus speeding up the user's wiring efficiency.

[0046] The base is made of a one-piece molded high-strength conductive metal material, which has strong resistance to deformation and ensures that the structure remains stable even when operating for a long time and subjected to large mechanical stress. This reduces the safety hazards caused by poor contact and ensures the safe operation of the power system.

[0047] The beneficial effects of this utility model are as follows:

[0048] This invention provides a ceramic matrix material for an insulating support with a long-term temperature resistance of approximately 2000 °C, far exceeding that of plastics (approximately 120–200 °C). During cable flame combustion tests (950–1000 °C, 3 h), the structure remains intact, without softening or decomposition, ensuring reliable insulation and mechanical support even in extreme high-temperature or fire environments, thus greatly improving the fire safety of the system.

[0049] In this invention, when the second ceramic insulation module approaches the first ceramic insulation module, the retaining rib automatically enters the corresponding slot, achieving precise alignment between the modules. This eliminates the need for repeated manual adjustments, significantly reducing assembly difficulty and labor intensity, and enabling convenient and reliable on-site installation. Furthermore, the retaining rib and slot form a mechanical lock, enhancing the tensile and shear strength between the modules, making them less prone to loosening even under vibration or thermal expansion conditions.

[0050] In this invention, bolt tightening prevents the separation of the first and second ceramic insulation modules, ensuring the overall structural integrity and long-term reliable operation of the insulation support.

[0051] This invention provides an insulating bracket for a power cable connection device with a temperature resistance of approximately 2000 °C. The iron high-temperature resistant shell of the power cable connection device (melting point approximately 1538 °C) can maintain structural integrity and insulation performance even under flame combustion conditions of 950–1000 °C, effectively preventing insulation failure caused by fire. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of an insulating support.

[0053] Figure 2 This is a schematic diagram of the insulating support from another angle.

[0054] Figure 3 This is an assembly diagram of the first ceramic insulation module and the second ceramic insulation module.

[0055] Figure 4 This is an assembly view of the first and second ceramic insulation modules from another angle.

[0056] Figure 5 This is a schematic diagram of cable terminals.

[0057] Figure 6 This is an assembly diagram of the first ceramic insulation module, cable terminals, and the second ceramic insulation module.

[0058] Figure 7 This is an assembly diagram of the first and second ceramic insulation modules (some cable terminals enter the receiving slot of the first ceramic insulation module).

[0059] Figure 8 This is a schematic diagram of the combination of an insulating support and cable terminals (the cable terminals enter the receiving cavity of the insulating support).

[0060] Figure 9 This is an assembly diagram for a power cable connection device.

[0061] Figure 10 This is a schematic diagram of a power cable connection device. Detailed Implementation

[0062] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0063] Implementation examples, in conjunction with Figures 1 to 4 As shown, a ceramic insulating bracket 1 includes a first ceramic insulating module 2 and a second ceramic insulating module 3. The first ceramic insulating module 2 has a plurality of receiving slots 11 for accommodating some cable terminals 4, and the second ceramic insulating module 3 has a plurality of receiving slots 11 for accommodating cable terminals.

[0064] The first ceramic insulation module 2 and the second ceramic insulation module 3 are connected, and the receiving groove 11 of the first ceramic insulation module 2 and the receiving groove 11 of the second ceramic insulation module 3 are connected to form a receiving cavity 5 for accommodating the cable terminal 4.

[0065] Furthermore, the first ceramic insulation module 2 is provided with a retaining rib 6 and a retaining groove 7, and the second ceramic insulation module 3 is provided with a retaining rib 6 and a retaining groove 7. The retaining rib 6 of the first ceramic insulation module 2 is inserted into the retaining groove 7 of the second ceramic insulation module 3, and the retaining rib 6 of the second ceramic insulation module 3 is inserted into the retaining groove 7 of the first ceramic insulation module 2, thereby realizing the connection of the first ceramic insulation module 2 and the second ceramic insulation module 3 into one unit.

[0066] Furthermore, the first ceramic insulation module 2 is provided with the retaining rib 6 around the corresponding portion of the receiving groove 11, and the first ceramic insulation module 2 is provided with the retaining groove 7 around the corresponding portion of the receiving groove 11. The second ceramic insulation module 3 is provided with the retaining rib 6 around the corresponding portion of the receiving groove 11, and the first ceramic insulation module 2 is provided with the retaining groove 7 around the corresponding portion of the receiving groove 11.

[0067] Furthermore, the receiving groove 11 is provided with a retaining rib 8 to prevent the cable terminal 4 from becoming loose.

[0068] Furthermore, the receiving groove 11 has an opening on one side with the baffle 8, and the receiving groove 11 has an opening on the other side for connecting to another ceramic insulating module. The receiving groove 11 has the baffle 8 on its top.

[0069] Furthermore, the first ceramic insulation module 2 has five of the aforementioned receiving slots 11, and the second ceramic insulation module 3 has five of the aforementioned receiving slots 11.

[0070] Furthermore, it also includes bolts and nuts. The first ceramic insulation module 2 has through holes 12 to facilitate the bolts to pass through. The bolts pass through the through holes 12 of the first ceramic insulation module 2 and the through holes 12 of the second ceramic insulation module 3 in sequence to connect the nuts, thereby locking the first ceramic insulation module 2 and the second ceramic insulation module 3.

[0071] Combination Figures 5 to 10 As shown, a power cable connection device includes a cable terminal block 4 and a high-temperature resistant housing 9. The cable terminal block 4 is snapped into the receiving cavity 5 of an insulating support 1. The insulating support 1 is disposed inside the high-temperature resistant housing 9. The high-temperature resistant housing 9 has a main cable inlet / outlet 93 and a branch cable inlet / outlet 94.

[0072] Furthermore, the high-temperature resistant housing 9 includes an upper housing 91 and a lower housing 92. The upper housing 91 is an iron upper housing, and the lower housing 92 is an iron lower housing. The upper housing 91 and the lower housing 92 are connected to form the high-temperature resistant housing 9.

[0073] Furthermore, the cable terminal 4 includes a base 41 integrally formed from a high-strength conductive metal material that is not easily deformed under stress, a conductive metal sliding plate 42 made from a highly conductive metal material, and a wire pressing metal plate 43;

[0074] The base 41 is provided with a cable core receiving channel 44, and the base 41 has an open opening that connects to the cable core receiving channel 44.

[0075] The conductive metal slide plate 42 is provided with an upper arc-shaped opening 421 and a lower arc-shaped opening 422. The conductive metal slide plate 42 is movably placed in the cable core receiving channel 44. The lower arc-shaped opening 422 and the bottom wall of the cable core receiving channel 44 form a lower clamping cavity 45 for clamping the cable core.

[0076] The wire pressing metal plate 43 is provided with a height-adjustable wire pressing component 46. The wire pressing metal plate 43 is detachably mounted on the base 41 with a sealed opening. The wire pressing component 46 faces the upper arc-shaped opening 421. The wire pressing component 46 and the upper arc-shaped opening 421 form an upper clamping cavity 47 for clamping the cable core.

[0077] Users can quickly complete the installation of this high-temperature resistant power cable connection device by following these steps:

[0078] First, insert the cable terminal 4 into the corresponding receiving slot 11 of the first ceramic insulation module 2.

[0079] Subsequently, the second ceramic insulation module 3 is aligned with the first ceramic insulation module 2, so that the retaining rib 6 of the first ceramic insulation module 2 is inserted into the retaining groove 7 of the second ceramic insulation module 3, and the retaining rib 6 of the second ceramic insulation module 3 is inserted into the retaining groove 7 of the first ceramic insulation module 2, thereby connecting the first ceramic insulation module 2 and the second ceramic insulation module 3.

[0080] Subsequently, the bolts are passed through the pre-reserved through holes 12 of the first ceramic insulation module 2 and the second ceramic insulation module 3 and the nuts are tightened to achieve a firm lock of the first ceramic insulation module 2 and the second ceramic insulation module 3, forming a complete insulation bracket 1, and the cable terminal 4 is safely enclosed in the receiving cavity 5 of the ceramic insulation bracket 1.

[0081] Finally, the corresponding cable terminal 4 is introduced into the cable connection, and the insulating bracket 1 is directly embedded into the high-temperature resistant shell 9, which is composed of an iron upper shell and an iron lower shell. The cable is then led out from the high-temperature resistant shell 9, thus completing the installation of the entire high-temperature resistant power cable connection device.

Claims

1. A ceramic insulating bracket, comprising a first ceramic insulating module and a second ceramic insulating module, characterized in that: The first ceramic insulation module has multiple receiving slots for accommodating cable terminals, and the second ceramic insulation module has multiple receiving slots for accommodating cable terminals. The first ceramic insulation module and the second ceramic insulation module are connected, and the receiving groove of the first ceramic insulation module and the receiving groove of the second ceramic insulation module are connected to form a receiving cavity for accommodating cable terminals.

2. The ceramic insulating bracket according to claim 1, characterized in that: The first ceramic insulation module is provided with a retaining rib and a retaining groove, and the second ceramic insulation module is provided with a retaining rib and a retaining groove. The retaining rib of the first ceramic insulation module is inserted into the retaining groove of the second ceramic insulation module, and the retaining rib of the second ceramic insulation module is inserted into the retaining groove of the first ceramic insulation module, so as to realize the connection between the first ceramic insulation module and the second ceramic insulation module.

3. The ceramic insulating bracket according to claim 2, characterized in that: The first ceramic insulation module has a retaining rib around its corresponding receiving groove and a retaining slot around its corresponding receiving groove; the second ceramic insulation module has a retaining rib around its corresponding receiving groove and a retaining slot around its corresponding receiving groove.

4. The ceramic insulating bracket according to claim 1, characterized in that: The receiving groove is provided with a retaining rib to prevent the cable terminals from becoming loose.

5. The ceramic insulating bracket according to claim 4, characterized in that: The receiving groove has an opening on one side with the baffle rib, and an opening on the other side for connecting to another receiving groove of ceramic insulation module. The receiving groove has the baffle rib on the top.

6. The ceramic insulating bracket according to claim 1, characterized in that: The first ceramic insulation module has five of the aforementioned receiving slots, and the second ceramic insulation module has five of the aforementioned receiving slots.

7. The ceramic insulating bracket according to claim 1, characterized in that: It also includes bolts and nuts. Both the first ceramic insulation module and the second ceramic insulation module have through holes to facilitate the bolts to pass through. The bolts pass through the through holes of the first ceramic insulation module and the second ceramic insulation module in sequence to connect the nuts, thereby locking the first ceramic insulation module and the second ceramic insulation module.

8. A power cable connection device employing a ceramic insulating bracket as described in any one of claims 1-7, characterized in that: It includes cable terminals and a high-temperature resistant housing. The cable terminals are snapped into the receiving cavity of a ceramic insulating bracket. The ceramic insulating bracket is set inside the high-temperature resistant housing. The high-temperature resistant housing has main cable inlet and outlet and branch cable inlet and outlet.

9. The power cable connection device according to claim 8, characterized in that: The high-temperature resistant housing includes an upper housing and a lower housing. The upper housing is a metal upper housing, and the lower housing is a metal lower housing. The upper housing and the lower housing are connected to form the high-temperature resistant housing.

10. The power cable connection device according to claim 8, characterized in that: The cable terminal block includes a base integrally formed from a high-strength conductive metal material that is not easily deformed under stress, a conductive metal sliding plate made of a highly conductive metal material, and a wire pressing metal plate. The base is provided with a cable core receiving channel, and the base has an open opening that connects to the cable core receiving channel; The conductive metal slide plate is provided with an upper arc-shaped opening and a lower arc-shaped opening. The conductive metal slide plate is movably placed in the cable core receiving channel. The lower arc-shaped opening and the bottom wall of the cable core receiving channel form a lower clamping cavity for clamping the cable core. The wire pressing metal plate is provided with a height-adjustable wire pressing component. The wire pressing metal plate is detachably mounted on the base with a sealed opening. The wire pressing component faces the upper arc-shaped opening, and the wire pressing component and the upper arc-shaped opening form an upper clamping cavity for clamping the cable core.

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