Anti-loose torque terminal

Abstract

This utility model provides an anti-loosening torque terminal, including a terminal body, a conductive wire sleeve, and a locking bolt. The terminal body has a sleeve groove and a connecting hole, and a threaded hole communicating with the sleeve groove. A polygonal positioning block is provided on the bottom inner wall of the sleeve groove. The conductive wire sleeve includes a tube and a cover detachably connected to the tube. The cover and the cavity installed between the tube form a clamping groove, which extends along a ring-shaped path. This device does not require additional crimping tools or equipment, making the connection more convenient. It avoids the influence of terminal material characteristics, human operation errors, equipment precision, and other factors on the connection quality between the terminal and the wire during crimping. Its structure is simple and reliable, easy to operate, has low maintenance costs, and is widely applicable.

Description

Technical Field

[0001] This utility model relates to an electrical connection device, specifically, to an anti-loosening torque terminal. Background Technology

[0002] In the electrical industry, reliable connections between terminals and wires are crucial, directly affecting the safe and stable operation of electrical equipment. While traditional terminal crimping technology is widely used, it still presents several problems in practical applications, primarily in the following aspects: Traditional crimping methods rely primarily on mechanical force to deform the terminals and thus grip the conductor. Due to various factors, crimping quality can vary between batches and even within the same batch, making it difficult to guarantee consistency. This results in a lack of uniform and tight contact between the terminals and conductors, leaving small gaps. Over long-term use, environmental factors such as vibration and thermal expansion and contraction can cause these gaps to gradually widen, leading to loosening or even detachment of the connection, potentially causing power outages, short circuits, and other safety hazards. During crimping, terminal deformation inevitably reduces the cross-sectional area of ​​the conductor, a phenomenon known as "crimping cross-sectional loss." Excessive cross-sectional loss significantly increases the conductor's resistance and reduces its current-carrying capacity. Due to limitations in connection reliability and current carrying capacity, traditional crimped terminals are prone to overheating under full load. Prolonged high temperatures accelerate oxidation and corrosion of the terminals and conductors, further increasing contact resistance and creating a vicious cycle that ultimately leads to connection failure. When current flows, the connection generates even more heat, causing localized overheating, accelerating insulation aging, and potentially even causing a fire.

[0003] Therefore, there is an urgent need for a non-loosening torque terminal that does not require additional crimping tools or equipment, making the connection more convenient. It avoids the impact of terminal material characteristics, as well as human operation errors and equipment precision during crimping on the connection quality between the terminal and the wire. Its structure is simple and reliable, easy to operate, has low maintenance costs, and is widely applicable. Utility Model Content

[0004] A new anti-loosening torque terminal has been designed that eliminates the need for additional crimping tools or equipment, making connections more convenient. It avoids the impact of terminal material properties, human error during crimping, and equipment precision on the connection quality between the terminal and the wire. Its structure is simple and reliable, easy to operate, has low maintenance costs, and is widely applicable.

[0005] This utility model provides an anti-loosening torque terminal, including a terminal body, a conductive wire sleeve, and a locking bolt: The terminal body is provided with a sleeve groove and a connecting hole. The terminal body is provided with a threaded hole that communicates with the sleeve groove. The bottom inner wall of the sleeve groove is provided with a polygonal positioning block. The conductive wire sleeve includes a tube body and a cover body that is detachably connected to the tube body. The cover body and the cavity installed between the tube body form a clamping groove, which extends along a ring-shaped path. The tube body is provided with a through insertion hole, and the tube body is provided with a wave channel. The wave channel extends along the wave trajectory, and the wave channel is alternately provided with arc-shaped bosses and arc-shaped grooves. The locking bolt passes through the threaded hole and the socket on the terminal body in sequence and abuts against the wire.

[0006] Preferably, the tube body is provided with an annular groove, and the annular groove is provided with a first connecting thread.

[0007] Preferably, the cover is provided with a connecting ring, the connecting ring is provided with a second connecting thread that mates with the first connecting thread, and a gasket is provided in the area enclosed by the connecting ring, the gasket being connected to one end of the tube.

[0008] Preferably, the locking bolt is provided with an anti-loosening washer.

[0009] Preferably, the cover is provided with a forked pin, which is located at the center of the area enclosed by the pad ring, and the end of the forked pin is a pointed tip.

[0010] Preferably, the wave channel forms an arc-shaped protrusion with a pin, and the end of the pin is a pointed tip.

[0011] Preferably, a sealing ring is provided on the outer side of the tube body, and the sealing ring is engaged with the sealing groove on the inner wall of the sleeve when the tube body is installed in the sleeve groove.

[0012] Preferably, both the terminal body and the tube body are provided with guide holes, and a conductive film is provided inside the guide holes. The conductive film passes through the guide holes and abuts against the wire, and an electrorheological fluid cavity is wrapped inside the conductive film.

[0013] The beneficial effects of this utility model are as follows: This utility model provides an anti-loosening torque terminal. The device uses bolts to provide torque, achieving the connection between the terminal and the wire. Compared to traditional crimping methods, it eliminates the need for additional crimping tools or equipment, making the connection more convenient. It also avoids the impact of terminal material properties, human error during crimping, and equipment precision on the connection quality between the terminal and the wire. The wire is installed on the terminal through a conductive sleeve, achieving sequential conductivity between the wire, the conductive sleeve, and the terminal. This avoids the cross-sectional loss caused by crimping, reduces the wire's resistance, increases its current-carrying capacity, reduces heat generation at the connection point, prevents localized overheating and accelerated insulation aging, and reduces the risk of fire. During connection, the corrugated holes of the conductive sleeve fit tightly against the wire, and the conductive sleeve adheres to the inner wall of the terminal, preventing gaps and reducing resistance. The corrugated holes of the conductive sleeve not only increase the current-carrying capacity by increasing the conductive contact area but also allow the wire to form alternating protrusions and recesses after installation. The bolt abuts against the recessed part of the wire, using the bolt to restrict the sliding of the protrusions and prevent the wire from detaching from the terminal. Attached Figure Description

[0014] Figure 1 A schematic diagram of the anti-loosening torque terminal; Figure 2 Exploded view of the anti-loosening torque terminal; Figure 3 A cross-sectional view of the exploded view of the anti-loosening torque terminal; Figure 4 This is a cross-sectional view of the conductive wire sleeve; Figure 5 This is a cross-sectional view of an exploded view of a conductive wire sleeve.

[0015] In the figure: Terminal body 1, sleeve groove 11, connecting hole 12, threaded hole 13, polygonal positioning block 14, conductive wire sleeve 2, tube body 21, wavy channel 211, arc boss 212, arc groove 213, insertion hole 214, ring groove 215, insertion pin 216, cover body 22, sealing ring 221, connecting ring 222, washer ring 223, forked pin 224, locking bolt 3, guide hole 4, conductive film 5, electrorheological fluid chamber 6. Detailed Implementation

[0016] To make the technical solution of this utility model easier to understand, the technical solution of this utility model will now be clearly and completely described in conjunction with the accompanying drawings and specific embodiments.

[0017] Example 1: like Figure 1-5 As shown, an anti-loosening torque terminal of this embodiment includes a terminal body 1, a conductive wire sleeve 2, and a locking bolt 3. The terminal body 1 is provided with a sleeve groove 11 and a connecting hole 12. The terminal body 1 is provided with a threaded hole 13 communicating with the sleeve groove 11. The bottom inner wall of the sleeve groove 11 is provided with a polygonal positioning block 14. The conductive wire sleeve 2 includes a tube body 21 and a cover 22 detachably connected to the tube body 21. The cover 22 and the cavity installed between the tube body 21 form a clamping groove, which extends along an annular path. The tube body 21 is provided with a through insertion hole 214, and the tube body 21 is provided with a wave channel 211. The wave channel 211 extends along the wave trajectory, and the wave channel 211 is alternately provided with arc-shaped bosses 212 and arc-shaped grooves 213. The locking bolt 3 passes through the threaded hole 13 and the insertion hole 214 on the terminal body 1 in sequence and abuts against the wire.

[0018] The tube body 21 is provided with an annular groove 215, and the annular groove 215 is provided with a first connecting thread.

[0019] The cover 22 is provided with a connecting ring 222, the connecting ring 222 is provided with a second connecting thread that mates with the first connecting thread, and a gasket 223 is provided in the area enclosed by the connecting ring 222, the gasket 223 being connected to one end of the tube 21.

[0020] The locking bolt 3 is equipped with an anti-loosening washer.

[0021] The cover 22 is provided with a forked pin 224, which is located at the center of the area enclosed by the pad ring 223, and the end of the forked pin 224 is a pointed tip.

[0022] The wave channel 211 forms an arc-shaped boss 212 on which a pin 216 is provided, and the end of the pin 216 is a pointed tip.

[0023] A sealing ring 221 is provided on the outside of the tube body 21. When the tube body 21 is installed in the sleeve groove 11, the sealing ring 221 is engaged with the sealing groove on the inner wall of the sleeve groove 11.

[0024] Both the terminal body 1 and the tube body 21 are provided with guide holes 4. A conductive film 5 is provided inside the guide hole 4. The conductive film 5 passes through the guide hole 4 and abuts against the wire. An electrorheological fluid cavity 6 is wrapped inside the conductive film 5.

[0025] Example 2: Unlike Example 1, such as Figure 1-5 As shown, this embodiment has an anti-loosening torque terminal. The conductive wire sleeve 2 includes a tube body 21 and a cover 22 detachably connected to the tube body 21, for example, by threaded connection or snap-fit ​​connection. A corrugated hole 211 is located on the tube body 21, and the cover 22 covers one opening of the corrugated hole 211. Both the tube body 21 and the cover 22 can be used to insert the wire. The cover 22 abuts against the bottom wall of the sleeve groove 11. The bottom wall of the sleeve groove 11 is provided with a polygonal positioning block 14, and the cover 22 is provided with a polygonal positioning groove 221. When the conductive wire sleeve 2 is inserted into the sleeve groove 11, the cover 22 enters the sleeve groove 11 first until the polygonal positioning block 14 engages with the polygonal positioning groove 221, achieving positioning and facilitating alignment of the threaded hole 13 and the insertion hole 214. When using the conductive wire sleeve 2, the wire core is first inserted into the corrugated hole 211 of the tube body 21. After confirming that the wire core is located at the opening at one end of the tube body 21, the opening is sealed by installing the cover 22. Finally, insert the wire core, tube 21, and cover 22 into the slot 11 as a whole.

[0026] To ensure a secure connection between the conductive sleeve 2 and the conductor core, the cover 22, after being installed on the tube 21, forms a clamping groove to hold the end of the conductor core. Specifically, the tube 21 has an annular groove 215 with a first connecting thread, and the cover 22 has a connecting ring 222 with a second connecting thread that mates with the first connecting thread, thus achieving a threaded connection between the cover 22 and the tube 21. A washer ring 223 is provided within the area enclosed by the connecting ring 222. The washer ring 223 is connected to one end of the tube 21, forming a clamping groove between the tube 21 and the cover 22, extending along an annular path. The conductor core consists of multiple copper wires. A forked pin 224 is provided on the cover 22, located at the center of the area enclosed by the washer ring 223, with a pointed end. When installing the cover 22, it is positioned close to the tube 21 and the wire core. The tip of the forked pin 224 is inserted into the middle of multiple copper wires in the wire core, causing the copper wires to be pushed open and inserted into the clamping slots along the perimeter. Finally, the cover 22 is tightened, and the cover 22 and the tube 21 clamp one end of the copper wire in the wire core. Through the cover 22 and the forked pin 224, not only is the wire core prevented from detaching from the conductive sleeve 2, but the conductivity of the forked pin 224 also increases the conductive area, further improving the current-carrying performance.

[0027] A pin 216 is provided on the arc-shaped boss 212 formed by the corrugated hole 211. The end of the pin 216 is a pointed tip. The pointed tip of the pin 216 is inserted between multiple copper wires of the conductor core, making the raised part of the conductor larger. This allows the arc-shaped boss 212 of the corrugated hole 211 to fit more tightly with the raised part of the conductor, resulting in better conductivity, greatly increased friction, and prevention of the conductor from detaching from the corrugated hole 211. At the same time, the pin 216 can conduct electricity, increasing the conductive current-carrying area.

[0028] A sealing ring is provided on the outside of the tube body 21. When the tube body 21 is installed in the sleeve groove 11, the sealing ring is engaged with the sealing groove on the inner wall of the sleeve groove 11, which further improves the stability of the tube body 21 installed in the sleeve groove 11.

[0029] The conductive film 5 is cylindrical and has a current-rheological fluid cavity 6, which is filled with current-rheological fluid. Both the terminal body 1 and the tube body 21 have guide holes 4. After the wire is locked onto the terminal body 1 through the conductive wire sleeve 2 and the locking nut, the conductive film 5 is inserted into the guide hole 4. Finally, insulating tape or heat shrink tubing or cold shrink tubing is wrapped around the outside of the terminal body 1 to cover the conductive film 5 and the current-rheological fluid cavity 6 inside the conductive film 5. When the terminal is in use, the electrical energy generated by the wire will flow to the conductive film 5, causing the current-rheological fluid in the current-rheological fluid cavity 6 to change from a liquid state to a solid state, increasing its hardness, and further preventing the conductive wire sleeve 2 from detaching from the sleeve groove 11 of the terminal body 1.

[0030] The conductive film 5 passes through the guide hole 4 on the tube body 21 and abuts against the wire. Whether the electrorheological fluid solidifies is used to determine whether it conducts electricity. Especially during maintenance, part of the insulating tape can be torn off, and then the conductivity can be determined by whether the electrorheological fluid inside the conductive film 5 solidifies. At the same time, the conductive film 5 can also be connected to an external measuring device to measure the current and voltage of the wire.

[0031] To further reduce the loosening problem caused by thermal expansion and contraction of wires and traditional terminals, the locking bolts 3 and conductive sleeves 2 in this application are all made of materials with a negative coefficient of thermal expansion. These materials have the property of expanding and contracting with temperature changes, which is the opposite of thermal expansion and contraction. This opposite property ensures that the locking bolts 3, conductive sleeves 2, and wires maintain a tight fit. Materials with a negative coefficient of thermal expansion include, but are not limited to, zirconium tungstate, lithium nepheline composite conductive materials (such as lithium nepheline combined with metal particles to enhance conductivity), copper-tungsten composite materials, graphene-metal composite materials, graphene-ceramic composite materials, and other conductive composite materials.

[0032] Understandably, materials with low coefficients of thermal expansion, such as locking bolts 3 and conductive sleeves 2, can be used to reduce the impact of temperature. Conductive materials such as Invar alloy, Invar alloy, aluminum-silicon carbide composites, silicon carbide, titanium nitride, and conductive silicon nitride ceramics can be employed. For example, using Invar alloy, which exhibits neither thermal expansion nor contraction with temperature changes, is a magnetic metal alloy composed of iron (Fe) and nickel (Ni) in a specific ratio. Invar alloy displays almost zero thermal expansion over a wide range of temperature and pressure. This anomalous phenomenon is known as the Invar effect. Due to this unique property, it is highly suitable for applications requiring extremely high precision and connection stability, preventing loosening.

[0033] Conductive silicon nitride ceramics can prevent the impact of environmental factors such as vibration and thermal expansion and contraction during long-term use, and prevent the gap between the wire and the locking bolt 3 and conductive sleeve 2 from further widening, which could lead to loosening or even detachment of the connection and cause safety accidents such as power outages and short circuits.

[0034] During use, this device avoids losses caused by the cross-sectional area of ​​the terminal body 1 being crimped with the wire by tightening the bolt 3, thus reducing the resistance of the wire, increasing its current carrying capacity, reducing the amount of heat generated at the connection, preventing localized overheating and accelerated insulation aging, and reducing the risk of fire. No additional crimping tools or equipment are required during installation, resulting in higher efficiency. The corrugated hole 211 increases the connection length and contact area between the conductive sleeve 2 and the wire, improving current carrying capacity. It also allows the wire to be installed in the conductive sleeve 2 with alternating protrusions and recesses. The bolt abuts against the recessed part of the wire, and the bolt restricts the sliding of the protrusions of the wire to prevent the wire from detaching from the terminal, resulting in stronger connection stability. When the conductor and conductive sleeve 2 deform due to thermal expansion and contraction caused by heat generated by current overload, the protrusion of the conductor can also cooperate with the arc groove 213 of the conductive sleeve 2, and the arc boss 212 of the conductive sleeve 2 can also cooperate with the concave part of the conductor. This ensures that the conductor extends in a wavy manner and is in an uneven whole, thereby ensuring that the friction between the conductor and the locking bolt 3 is large enough, and thus ensuring the connection stability between the conductive sleeve 2 and the conductor.

[0035] It should be noted that the embodiments described herein are only some embodiments of this utility model, and not all implementations of this utility model. These embodiments are merely illustrative and are intended only to provide a more intuitive and clear way of understanding the content of this utility model, not to limit the technical solutions described herein. All other implementation methods that can be conceived by those skilled in the art without creative effort, as well as other simple substitutions and variations of the technical solutions of this utility model, without departing from the concept of this utility model, are within the protection scope of this utility model.

Claims

1. A torque-locking terminal, comprising a terminal body (1), a conductive wire sleeve (2), and a locking bolt (3), characterized in that: The terminal body (1) is provided with a sleeve groove (11) and a connecting hole (12). The terminal body (1) is provided with a threaded hole (13) communicating with the sleeve groove (11). The bottom inner wall of the sleeve groove (11) is provided with a polygonal positioning block (14). The conductive wire sleeve (2) includes a tube (21) and a cover (22) detachably connected to the tube (21). The cover (22) and the cavity installed between the tube (21) form a clamping groove, which extends along an annular path. The tube body (21) is provided with a through insertion hole (214), and the tube body (21) is provided with a wave channel (211). The wave channel (211) extends along the wave trajectory, and the wave channel (211) is alternately provided with arc bosses (212) and arc grooves (213). The locking bolt (3) passes through the threaded hole (13) and the socket (214) on the terminal body (1) in sequence and abuts against the wire.

2. The anti-loosening torque terminal as described in claim 1, characterized in that, The tube body (21) is provided with an annular groove (215), and the annular groove (215) is provided with a first connecting thread.

3. The anti-loosening torque terminal as described in claim 1, characterized in that, The cover (22) is provided with a connecting ring (222), the connecting ring (222) is provided with a second connecting thread that mates with the first connecting thread, and a gasket (223) is provided in the area enclosed by the connecting ring (222), and the gasket (223) is connected to one end of the tube (21).

4. The anti-loosening torque terminal as described in claim 1, characterized in that, The locking bolt (3) is equipped with an anti-loosening washer.

5. The anti-loosening torque terminal as described in claim 3, characterized in that, The cover (22) is provided with a forked pin (224), which is located at the center of the area enclosed by the pad ring (223), and the end of the forked pin (224) is a pointed tip.

6. The anti-loosening torque terminal as described in claim 1, characterized in that, The wave channel (211) forms an arc boss (212) on which a pin (216) is provided, and the end of the pin (216) is a pointed tip.

7. The anti-loosening torque terminal as described in claim 1, characterized in that, The outer side of the tube body (21) is provided with a sealing ring (221). When the tube body (21) is installed in the sleeve groove (11), the sealing ring (221) is engaged with the sealing groove on the inner wall of the sleeve groove (11).

8. The anti-loosening torque terminal as described in claim 1, characterized in that, Both the terminal body (1) and the tube body (21) are provided with guide holes (4), and a conductive film (5) is provided inside the guide hole (4). The conductive film (5) passes through the guide hole (4) and abuts against the wire. The conductive film (5) contains an electrorheological fluid cavity (6).

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