An industrial low voltage power cable

Abstract

The present application relates to an industrial low-voltage power cable applied to the field of cables, which replaces the crimping mode of the cable in the prior art by means of abutting connection of the terminal post and the rotating piece, and meanwhile, the abutting state is maintained by limiting through hot-melt filler, so that the power is stably transmitted. When the temperature of the joint is too high, the hot-melt filler gradually melts, the binding force of the terminal post and the rotating piece is weakened, the rotating piece gradually resets in the normal direction, the terminal post and the rotating piece are automatically separated by cooperating with the contraction force of the spring cable core, and then the effect of automatically cutting off the connection between the two cable bodies is realized. Compared with the heat dissipation mode of the joint in the prior art, the further temperature rise of the joint can be effectively avoided, and the phenomena of combustion, fire and the like in the case of temperature anomaly are achieved, and the safety hazard is greatly reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to an industrial low-voltage power cable, in particular to an industrial low-voltage power cable applied in the field of cables. BACKGROUND

[0002] The main features of low-voltage cables are as follows:

[0003] 1. Low voltage level: suitable for power transmission or distribution systems below 1kV.

[0004] 2. Simple structure: generally includes conductor (usually copper or aluminum, twisted structure to improve flexibility), insulation layer (commonly used polyvinyl chloride, cross-linked polyethylene or rubber material), and outer sheath (PVC, PE or flame-retardant / halogen-free material for mechanical protection and environmental protection).

[0005] 3. Wide application scenarios: building electrical (such as lighting, socket), industrial equipment, temporary power supply, etc.

[0006] 4. Lower cost: compared with medium and high voltage cables, materials and manufacturing processes are simpler.

[0007] During the use of low-voltage cables, due to the influence of environmental temperature, or due to the oxidation of the conductor in the joint, water seepage, etc., the joint is prone to local overheating, and in severe cases, it may even cause burning, fire, etc. not only seriously affect the stable transmission of power, but also easily exist a large security risk.

[0008] To solve the above problems, the existing technology generally improves the heat dissipation rate at the joint to reduce the security risk, for example, the Chinese patent specification with publication number CN114243626B discloses a cable dismounting joint, and the Chinese patent specification with publication number CN113922321A discloses a device for automatically cooling the cable joint. However, this method is effective when the joint starts to heat up, but the effect is poor when the joint accumulates high temperature, and there may still be a security risk such as fire. SUMMARY

[0009] In view of the above existing technology, the technical problem to be solved by the present application is that the existing measures for cooling the joint have poor effect when the joint accumulates high temperature, and there is still a certain security risk.

[0010] To solve the above problems, the application provides an industrial low-voltage power cable, which comprises at least two cable bodies and a thermal monitoring joint arranged between the two adjacent cable bodies, the thermal monitoring joint comprises an outer shell and a bottom plate fixedly connected to the lower end of the outer shell, the cable bodies are fixedly connected to the end of the outer shell, the inner part of the outer shell is provided with a thermal monitoring unit, the thermal monitoring unit comprises a rotating piece, two connecting posts and a positioning rod fixedly connected to the lower end of the two connecting posts, the ends of the two connecting posts away from each other are fixedly connected with the spring cable core between the connecting post and the cable body on the same side, the inner bottom end of the outer shell is fixedly connected with a restraint table, the middle part of the bottom plate is provided with a positioning groove, the positioning rod is sequentially movably penetrated through the restraint table and the cable body and extends into the positioning groove, the upper end of the rotating piece is fixedly connected with a hard connecting piece between the top of the outer shell, the connecting post comprises a contact section matched with the rotating piece and an insulating section fixedly connected to the lower end of the contact section, the positioning rod comprises an active section and a moving section fixedly connected to the lower end of the active section, the outer end of the active section is fixedly connected with two connecting rods, the outer end of the active section is further provided with two pushing plates, the ends of the two connecting rods are fixedly connected with a limiting ring, the limiting ring is fixedly sleeved on the outer side of the insulating section, the two pushing plates are located in the restraint table, and the restraint table is filled with hot melt filler.

[0011] In the above industrial low-voltage power cable, the connecting mode of the connecting post and the rotating piece is used to replace the cable crimping mode in the prior art, so that the connection can be automatically cut off when the temperature of the joint is too high, thereby effectively avoiding further temperature rise of the joint, and the phenomenon of combustion, fire and the like caused by temperature abnormality is avoided, and the safety hazard is greatly reduced.

[0012] As a further improvement of the application, the contact section and the rotating piece are made of metal conductive material, the rotating piece is S-shaped, the rotating piece has elasticity, the two connecting posts are respectively matched with two arc sections of the S-shaped rotating piece, and the insulating section is made of insulating material.

[0013] As a further improvement of the application, the active section is cylindrical, the moving section is polygonal in cross section, and the moving section is completely located in the positioning groove, the pushing plate is fixedly connected with the active section, and an angle sensor is installed on one of the pushing plates.

[0014] As a further improvement of the application, in the top view: the vertical center line of the rotating piece, the axis of the positioning rod and the vertical center line of the thermal monitoring joint all coincide with each other, and the two ends and the midpoint of the rotating piece all fall on the vertical center line of the thermal monitoring joint.

[0015] In use, the two connecting posts are in contact with the two arc sections of the rotating piece, and the two ends of the rotating piece are away from the vertical center line of the thermal monitoring joint in counterclockwise direction.

[0016] As a further improvement of the present application, a plurality of wedge-shaped grooves are arranged in an annular array on the inner wall of the restraint platform, and the arc-shaped inner wall of the wedge-shaped grooves gradually approaches the center of the restraint platform in the counterclockwise direction.

[0017] As a further improvement of the present application, a plurality of wedge-shaped grooves are arranged in an annular array on the inner wall of the restraint platform, and the arc-shaped inner wall of the wedge-shaped grooves gradually approaches the center of the restraint platform in the counterclockwise direction.

[0018] As a further improvement of the present application, a plurality of wedge-shaped grooves are arranged in an annular array on the inner wall of the restraint platform, and the arc-shaped inner wall of the wedge-shaped grooves gradually approaches the center of the restraint platform in the counterclockwise direction.

[0019] As a further improvement of the present application, a plurality of wedge-shaped grooves are arranged in an annular array on the inner wall of the restraint platform, and the arc-shaped inner wall of the wedge-shaped grooves gradually approaches the center of the restraint platform in the counterclockwise direction.

[0020] As a further improvement of the present application, a plurality of wedge-shaped grooves are arranged in an annular array on the inner wall of the restraint platform, and the arc-shaped inner wall of the wedge-shaped grooves gradually approaches the center of the restraint platform in the counterclockwise direction. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a perspective view of the first embodiment of the present application;

[0022] Figure 2 is a perspective view of the first embodiment of the present application;

[0023] Figure 3 is a perspective view of the first embodiment of the present application;

[0024] Figure 4 is a perspective view of the first embodiment of the present application;

[0025] Figure 5 Fig. 2 is a top view of the first embodiment of the application when the two terminals are rotated in reverse direction to interfere with the rotating piece;

[0026] Figure 6 Fig. 3 is a top view of the first embodiment of the application when the two terminals are rotated in positive direction to reset and separate from the rotating piece after the overheat situation;

[0027] Figure 7 Fig. 4 is a perspective view of the positioning rod of the first embodiment of the application;

[0028] Figure 8 Fig. 5 is a sectional view of the restraining platform when the two cables interfere with each other in the first embodiment of the application;

[0029] Figure 9 Fig. 6 is a sectional view of the restraining platform when the two cables gradually separate due to the overheat situation at the joint in the first embodiment of the application;

[0030] Figure 10 Fig. 7 is a perspective view of the positioning rod when the overheat situation occurs in the second embodiment of the application;

[0031] Figure 11 Fig. 8 is a perspective view of the positioning rod when the temperature at the heat monitoring joint is normal in the second embodiment of the application;

[0032] Figure 12 Fig. 9 is a sectional view of the positioning rod when the overheat situation occurs in the second embodiment of the application.

[0033] Explanation of the reference numerals in the figures:

[0034] 1 cable body, 2 heat monitoring joint, 21 outer sheath, 22 bottom plate, 201 positioning groove, 3 terminal, 31 interference section, 32 insulation section, 4 rotating piece, 401 hard connecting piece, 5 spring cable core, 6 positioning rod, 61 driving section, 62 adjusting section, 63 limiting ring, 601 connecting rod, 602 pushing plate, 7 restraining platform, 701 wedge-shaped groove, 81 warning capsule, 82 material collecting capsule piece, 83 pull rope, 801 pre-driving groove, 802 liquid guiding channel. DETAILED DESCRIPTION

[0035] The two embodiments of the application will be described in detail below with reference to the accompanying drawings.

[0036] First embodiment:

[0037] Figures 1-3The utility model discloses an industrial low-voltage power cable, at least comprising two cable bodies 1 and the thermal monitoring joint 2 arranged between the two adjacent cable bodies 1, the thermal monitoring joint 2 comprises the outer sheath 21 and the bottom plate 22 fixedly connected at the lower end of the outer sheath 21, the cable body 1 is fixedly connected with the end of the outer sheath 21, the inner part of the outer sheath 21 is equipped with the thermal monitoring unit, the contact connection of the terminal post 3 and the swivel piece 4 replaces the cable crimping mode in the prior art, and the temperature at the connecting place of the two cable bodies 1 can be monitored through the thermal monitoring unit, when the abnormally high temperature appears, the terminal post 3 and the swivel piece 4 can be automatically separated in real time, and the electric connection between the two cable bodies 1 is cut off, so that the abnormally high temperature is not easy to further increase, and the subsequent combustion and fire are effectively avoided.

[0038] As Figure 4 The thermal monitoring unit comprises the swivel piece 4, the two terminal posts 3 and the position adjusting rod 6 fixedly connected at the lower end of the two terminal posts 3, the swivel piece 4 is S-shaped, and the swivel piece 4 is elastic, the two terminal posts 3 are matched with the two arc-shaped segments of the S shape respectively, the spring cable core 5 is fixedly connected between the end, away from each other, of the two terminal posts 3 and the cable body 1 on the same side, the restraining table 7 is fixedly connected to the inner bottom end of the outer sheath 21, the position adjusting groove 201 is dug in the middle of the bottom plate 22, the hard connecting sheet 401 is fixedly connected between the upper end of the swivel piece 4 and the top of the outer sheath 21, the terminal post 3 comprises the contact segment 31 matched with the swivel piece 4 and the insulating segment 32 fixedly connected at the lower end of the contact segment 31, the contact segment 31 and the swivel piece 4 are made of metal conductive material, and the insulating segment 32 is made of insulating material, so that the safety of power transmission between the spring cable core 5, the swivel piece 4 and the terminal post 3 is higher, and it is not easy to leak to the outside of the thermal monitoring joint 2.

[0039] As Figure 7, the adjusting rod 6 is sequentially movable through the restraint table 7 and the cable body 1 and extends into the adjusting slot 201, the adjusting rod 6 comprises a driving section 61 and a adjusting section 62 fixedly connected to the lower end of the driving section 61, two connecting rods 601 are fixedly connected to the outer end of the driving section 61, two pushing plates 602 are further arranged at the outer end of the driving section 61, the ends of the two connecting rods 601 are fixedly connected to a limiting ring 63, the limiting ring 63 is fixedly sleeved on the outer side of the insulating section 32, the two terminal posts 3 can be connected into one through the adjusting rod 6, so that the two terminal posts 3 can be synchronously deflected under the action of the adjusting rod 6, the driving section 61 is cylindrical, the adjusting section 62 is polygonal in cross section, and the adjusting section 62 is completely located in the adjusting slot 201, when the two cable bodies 1 are connected or after the connection of the two cable bodies 1 is cut off, the power transmission between the two cable bodies 1 is manually checked and restored, the bottom of the thermal monitoring joint 2 can be preheated first, so that the hot melt filler is gradually hot melted, at this time, a tool matched with the shape of the adjusting section 62 is used to rotate the adjusting section 62, so as to drive the two terminal posts 3 to rotate counterclockwise, and then the two terminal posts 3 are gradually embedded in the arc shape of the rotating piece 4 and gradually abut against the rotating piece 4, so that the two terminal posts 3 are reset.

[0040] In the embodiment, the pushing plates 602 are fixedly connected to the driving section 61, and an angle sensor is arranged on one of the pushing plates 602, so that the rotation of the pushing plate 602 can be monitored by the angle sensor, and the staff can remotely monitor the abnormality of the cable joint according to the data change of the angle sensor, so that the staff can timely take corresponding measures to deal with the thermal monitoring joint 2, the power can be timely restored, and the difficulty of checking the abnormal point after power cut is reduced.

[0041] As shown in Figure 6 In the perspective view, the vertical center line of the rotating piece 4, the axis of the adjusting rod 6 and the vertical center line of the thermal monitoring joint 2 all coincide with each other, and the two ends and the midpoint of the rotating piece 4 all fall on the vertical center line of the thermal monitoring joint 2.

[0042] As shown in Figure 5 In use, the two terminal posts 3 abut against the two arc-shaped sections of the rotating piece 4 respectively, and the two ends of the rotating piece 4 are counterclockwise away from the vertical center line of the thermal monitoring joint 2, at this time, the rotating piece 4 is in a twisted state along the counterclockwise direction under the pushing force of the terminal posts 3, and the spring cable core 5 is in a stretched state, when the temperature is abnormally high, the hot melt filler is lost, and the rotating piece 4 and the spring cable core 5 are restored along the clockwise direction, so that the terminal posts 3 are first rotated together with the rotating piece 4, and then gradually separated from the rotating piece 4, so that the two cable bodies 1 are temporarily disconnected, the staff needs to perform safety inspection on the place, and the hot melt filler is preheated and the adjusting rod 6 is rotated after it is determined that there is no abnormality, so that the two cable bodies 1 are connected again.

[0043] As shown in Figure 8, figure a represents hot melt filler, two pusher plates 602 are located in the restraint platform 7, and the restraint platform 7 is filled with hot melt filler, the inner wall of the restraint platform 7 is carved with a plurality of wedge-shaped grooves 701 arranged in a ring array, and the arc-shaped inner wall of the wedge-shaped groove 701 gradually approaches the axis of the restraint platform 7 in the counterclockwise direction, so that the depth of the wedge-shaped groove 701 in the clockwise direction becomes deeper, and the other inner wall of the turning part of the inner wall of the wedge-shaped groove 701 is a vertical inner wall, so that the hot melt filler is in a solidified state, a plurality of wedge-shaped grooves 701 can be limited, two pusher plates 602 are located in the solidified hot melt filler, temporarily forming a whole, effectively preventing the position change of the adjusting rod 6 and the two terminal posts 3 connected thereto, when the temperature is too high, the hot melt filler melts, at this time, the restraint force is lost, under the elastic force of the reset of the rotary piece 4 and the spring cable core 5, like Figure 9 , the adjusting rod 6 rotates, thereby realizing self-disconnection.

[0044] It is worth noting that the hot melt temperature of the hot melt filler is close to the limit high temperature of the safe operation temperature of the low-voltage cable and is higher than the limit high temperature, and the temperature difference between the two is not more than 5℃, which effectively ensures that the cable can be cut off in time when the temperature is higher than the limit high temperature of the safe operation, and it is not easy to continue to run at an abnormally high temperature, thereby effectively reducing the safety hazard of fire and burning.

[0045] In summary, the abutting connection mode of the terminal post 3 and the rotary piece 4 replaces the cable crimping mode in the prior art, and the hot melt filler is used to limit the abutting state between the two, so that the power is stably transmitted, when the temperature of the joint is too high, the hot melt filler gradually melts, the restraint force on the terminal post 3 and the rotary piece 4 is weakened, the rotary piece 4 is gradually reset in the positive direction, and the terminal post 3 and the rotary piece 4 are automatically separated, thereby realizing the effect of automatically cutting off the connection between the two cable bodies 1, compared with the heat dissipation mode of the joint in the prior art, the temperature of the joint can be effectively avoided to further rise, thereby achieving the phenomenon of burning, fire and other phenomena when the temperature is abnormal, and greatly reducing the safety hazard.

[0046] Second embodiment:

[0047] The embodiment adds a warning unit and related structures based on the first embodiment, and the rest is the same as the first embodiment.

[0048] Figures 11-12It is shown that the active section 61 is opened in the prediction groove symmetrical about the center of the active section 61, the prediction groove includes two pre-movement grooves 801 and two liquid guide channels 802, the pre-movement grooves 801 and the liquid guide channels 802 on the same side communicate with each other, and the pre-movement groove 801 is open to the outside. The end of the push plate 602 close to the active section 61 is fixedly connected with the push piece, the push piece is slidably connected with the pre-movement groove 801, the warning unit is further connected to the adjusting rod 6, the warning unit includes the receiving capsule 82 fixedly connected to one end of the push piece, the pull rope 83 fixedly connected to the other end of the push piece, and the warning capsule 81 movably penetrating the middle part of the adjusting section 62. The warning capsule 81 is of elastic structure, and the upper end of the warning capsule 81 is fixedly connected to the adjusting section 62. The receiving capsule 82, the liquid guide channel 802 and the warning capsule 81 communicate in sequence, and the interiors of the three are saturatedly filled with liquid. The liquid can be non-toxic and non-corrosive, and is preferably colored liquid. The radial end surface of the warning capsule 81 is opaque, and the cylindrical surface of the warning capsule 81 is transparent. When the hot melt filler gradually melts, the warning capsule 81 gradually recovers deformation. For example, Figure 10 Thus, the adjusting section 62 gradually shrinks inward, and the convex gradually decreases until it disappears. In this process, not only the convex disappears, but also the color gradually disappears. When the artificial receives the data change of the angle sensor, the abnormal hot monitoring connector 2 can be quickly locked according to the state of the warning capsule 81 at the adjusting section 62 during rechecking.

[0049] The pull rope 83, the push piece and the receiving capsule 82 are distributed in sequence along the counterclockwise direction. The receiving capsule 82 and the warning capsule 81 are both of elastic hollow capsule structure, and the pull rope 83 is of elastic structure. For example, Figure 11 When the cable is used, the lower end of the warning capsule 81 protrudes from the surface of the adjusting section 62. When an abnormally high temperature occurs, the hot melt filler gradually melts. In this process, when the flowability of the hot melt filler is low, the hot melt filler still has a binding force on the terminal post 3 and the rotary piece 4. The restoring deformation force of the rotary piece 4 and the spring cable core 5 is not enough to drive the terminal post 3 and the adjusting rod 6 to positively deflect. At this time, the small push plate 602 will gradually directly extrude the loose hot melt filler in the process of the hot melt filler gradually melting, so that the push plate 602 first deflects along the pre-movement groove 801 with the adjusting rod 6. At this time, the angle sensor can also be triggered, thereby generating a small amplitude data change. Compared with the first embodiment, the temperature is higher before the angle sensor is triggered. In this embodiment, the angle sensor can be triggered in advance, so that the staff can manually intervene before the connection between the two cable bodies 1 is cut off. This can not only reduce the safety hazard of subsequent fire burning, but also effectively reduce the direct power cut-off.

[0050] The above-mentioned embodiments of the present application are combined with the current actual demand, the protection scope is not limited to this, various changes made within the knowledge range of the person skilled in the art without departing from the concept of the present application still fall within the protection scope of the present application.

Claims

1. An industrial low-voltage power cable, characterized in that: The device includes at least two cable bodies (1) and a thermal monitoring connector (2) disposed between two adjacent cable bodies (1). The thermal monitoring connector (2) includes an outer sheath (21) and a base plate (22) fixedly connected to the lower end of the outer sheath (21). The cable body (1) is fixedly connected to the end of the outer sheath (21). A thermal monitoring unit is provided inside the outer sheath (21). The thermal monitoring unit includes a rotating plate (4), two terminals (3), and an adjustment rod (6) fixedly connected to the lower end of the two terminals (3). A spring cable core (5) is fixedly connected between the ends of the two terminals (3) that are far apart from each other and the cable body (1) on the same side. A binding platform (7) is fixedly connected to the bottom of the outer sheath (21). An adjustment groove (201) is carved in the middle of the base plate (22). The adjustment rod (6) moves through the binding platform (7) and the cable in sequence. The main body (1) extends into the adjustment groove (201). A rigid connecting piece (401) is fixedly connected between the upper end of the rotary plate (4) and the top of the outer shell (21). The terminal block (3) includes a contact section (31) that matches the rotary plate (4) and an insulating section (32) fixedly connected to the lower end of the contact section (31). The adjustment rod (6) includes an active section (61) and an adjustment section (62) fixedly connected to the lower end of the active section (61). Two connecting rods (601) are fixedly connected to the outer end of the active section (61). Two push plates (602) are also provided at the outer end of the active section (61). Limiting rings (63) are fixedly connected to the ends of the two connecting rods (601). The limiting rings (63) are fixedly sleeved outside the insulating section (32). The two push plates (602) are located inside the binding platform (7), and the binding platform (7) is filled with hot melt filler. The contact section (31) and the rotating plate (4) are both made of conductive metal material. The rotating plate (4) is S-shaped and elastic. The two terminals (3) are respectively matched with the two arc segments of the S-shape. The insulating section (32) is made of insulating material.

2. The industrial low-voltage power cable according to claim 1, characterized in that: The active section (61) is cylindrical, the adjustment section (62) has a polygonal cross section, and the adjustment section (62) is completely located in the adjustment groove (201). The pusher plate (602) is fixedly connected to the active section (61), and an angle sensor is installed on one of the pusher plates (602).

3. The industrial low-voltage power cable according to claim 1, characterized in that: From a top-down perspective: the vertical centerline of the rotary plate (4), the axis of the adjusting rod (6) and the vertical centerline of the thermal monitoring connector (2) all coincide with each other, and the two ends and the midpoint of the rotary plate (4) all fall on the vertical centerline of the thermal monitoring connector (2); When in use, the two terminals (3) respectively abut against the two arc segments of the rotating plate (4), and both ends of the rotating plate (4) are counterclockwise away from the vertical center line of the heat monitoring connector (2). At this time, the spring cable core (5) is in a stretched state.

4. The industrial low-voltage power cable according to claim 1, characterized in that: The inner wall of the binding platform (7) is carved with multiple wedge-shaped grooves (701) arranged in a ring array, and the arc-shaped inner wall of the wedge-shaped grooves (701) gradually approaches the axis of the binding platform (7) in a counterclockwise direction.

5. An industrial low-voltage power cable according to claim 1, characterized in that: The active section (61) has a prediction groove symmetrical about the center of the active section (61). The prediction groove includes two pre-movement grooves (801) and two liquid guiding channels (802). The pre-movement grooves (801) and liquid guiding channels (802) on the same side are interconnected. The opening of the pre-movement groove (801) is open to the outside. The pusher plate (602) is fixedly connected to the pusher plate at one end near the active section (61). The pusher plate is connected to the sliding rod of the pre-movement groove (801). The adjustment rod (6) is also connected to a warning unit.

6. An industrial low-voltage power cable according to claim 5, characterized in that: The warning unit includes a receiving bag (82) fixedly connected to one end of the lever, a pull rope (83) fixedly connected to the other end of the lever, and a warning bag (81) that moves through the middle of the adjustment section (62). The warning bag (81) is an elastic structure, and the upper end of the warning bag (81) is fixedly connected to the adjustment section (62). The receiving bag (82), the liquid guiding channel (802), and the warning bag (81) are connected in sequence, and all three are saturated with liquid.

7. An industrial low-voltage power cable according to claim 6, characterized in that: The pull rope (83), the lever, and the receiving bag (82) are distributed in a counterclockwise direction. The receiving bag (82) and the warning bag (81) are both elastic hollow bag structures. The pull rope (83) is an elastic structure. When the cable is in use, the lower end of the warning bag (81) protrudes from the surface of the adjustment section (62).

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