Variable frequency cable

Abstract

The frequency conversion cable of the utility model comprises a first cable and a second cable which are plugged together. A concave arc surface is arranged at the cable core connecting end of the first cable, a convex arc surface is arranged at the cable core connecting end of the second cable, the convex arc surface of the second cable is matched with the concave arc surface of the first cable, a fixing groove is formed in a sheath layer at the inserting position of the first cable, an elastic sheath section is arranged at the inserting position of the second cable, and the fixing groove is matched with the elastic sheath section. A buckle is arranged on the elastic sheath section, the buckle of the second cable is inserted into the fixing groove of the first cable to achieve fixed connection of the two cables, and the length of the buckle of the second cable extending out of the end face of the elastic sheath section is smaller than the distance from the fixing groove to the outer end face of the sheath layer. Therefore, when the buckle is matched with the fixing groove, the elastic sheath section of the second cable is compressed, and the tight matching between the cable core of the first cable and the cable core of the second cable is further stabilized. In a scene requiring frequent plugging and adjustment, the connection stability and the mechanical firmness of the cable are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, and in particular to a frequency conversion cable. Background Technology

[0002] When installing a frequency converter, it needs to be connected to peripheral devices such as motors, control computers, PLCs, and measuring instruments. In this scenario, the frequency converter cable is used to transmit control signals and power, ensuring coordinated operation between the devices. During equipment maintenance, if it is necessary to replace or repair the frequency converter cable, the cable usually needs to be reconnected to ensure normal equipment operation. For example, when the frequency converter cable is damaged or aged, it needs to be disconnected from the equipment, replaced with a new cable, and reconnected.

[0003] In existing variable frequency cables, the connection points may be damaged by mechanical stress in equipment that requires frequent plugging, unplugging, or adjustment, leading to connection interruption. The connection may gradually loosen or fail over long-term use, affecting the reliability of the equipment. Utility Model Content

[0004] In order to overcome the technical defect of the above-mentioned frequency converter cable, where the connection point may be damaged due to mechanical stress in equipment that requires frequent plugging and unplugging or adjustment, resulting in connection interruption, this utility model provides a frequency converter cable.

[0005] To solve the above problems, this utility model is implemented according to the following technical solution:

[0006] The present invention discloses a frequency conversion cable comprising a first cable and a second cable plugged together. The first cable has a concave arc surface at its core connection end, and the second cable has a convex arc surface at its core connection end, the convex arc surface of the second cable being adapted to the concave arc surface of the first cable. A fixing groove is provided on the sheath layer at the plug-in point of the first cable, and an elastic sheath section is provided at the plug-in point of the second cable. A buckle is provided on the elastic sheath section, and the buckle of the second cable is inserted into the fixing groove of the first cable to achieve a fixed connection between the two cables. The length of the buckle extending beyond the end face of the elastic sheath section is less than the distance from the fixing groove to the outer end face of the sheath layer of the first cable, thereby compressing the elastic sheath section of the second cable when the buckle engages with the fixing groove, further stabilizing the tight fit between the cores of the first and second cables.

[0007] Preferably, a sliding groove, a spring, and a button are also provided at the second cable plug-in point; the buckle is disposed in the sliding groove, and the inner surfaces of both the sliding groove and the buckle are provided with grooves for fixing the spring, and the buckle slides in the sliding groove; the button is embedded in the outer surface of the elastic sheath section for controlling the sliding of the buckle; the buckle is adapted to the fixing groove for fixing the first cable and the second cable.

[0008] Preferably, the protective cover is made of ABS plastic.

[0009] Preferably, both the first cable and the second cable include a composite cable core, a filling layer, an insulating layer, and the sheath layer; the composite cable core includes a cable core and an insulation layer, the insulation layer is cross-linked polyethylene, the insulation layer wraps the cable core, and the cable core is made of copper.

[0010] Preferably, the filling layer wraps around the composite cable core, and the filling layer is made of glass fiber rope.

[0011] Preferably, the insulating layer encloses the filling layer, and the insulating layer is chlorosulfonated polyethylene.

[0012] Preferably, the sheath layer covers the isolation layer.

[0013] Preferably, the elastic sheath segment is a polyurethane sheath.

[0014] This invention replaces the original single cable with a combination of two cables connected together. A special structure is used at the connection point (the core connection end of the first cable has a concave arc surface, and the core connection end of the second cable has a convex arc surface, the convex arc surface of the second cable matching the concave arc surface of the first cable). This concave-convex arc surface design prevents damage to the connection point from mechanical stress caused by bending and twisting at different angles. Simultaneously, the concave-convex arc surface design ensures a large contact area between the two cables when bent and twisted at different angles, thereby improving the stability and efficiency of current transmission and reducing connection interruptions due to poor contact.

[0015] This invention relates to a first cable and a second cable connected together via a snap-fit ​​and fixing groove structure. An elastic sheath section is provided at the insertion point of the second cable. This elastic sheath section is made of an elastic material to give it a certain degree of elasticity. Because the length of the snap-fit ​​extending beyond the end face of the elastic sheath section is less than the distance from the fixing groove to the outer end face of the sheath layer, the snap-fit ​​compresses the elastic sheath section of the second cable when it engages with the fixing groove. The elastic sheath section is compressed by the pulling force of the snap-fit, thus making the contact between the cores of the first and second cables tighter. This further stabilizes the tight fit between the cores of the first and second cables, further reducing connection interruptions due to poor contact. The compression design of the elastic sheath section of this invention can adapt to certain mechanical stresses and vibrations, ensuring long-term stable operation in complex environments (such as industrial equipment, frequency converters, etc.). The elastic sheath section not only provides a fixing function but also has a certain buffering function, protecting the cable core from external mechanical stresses and extending the cable's service life.

[0016] The design of the snap-fit ​​and fixing groove in this utility model makes cable insertion more convenient, eliminating the need for complex tools or operations and reducing installation difficulty. This design of the frequency converter cable, through optimized core connection and sheath fixing structure, significantly improves the cable's connection stability, mechanical robustness, and adaptability, making it particularly suitable for frequency converter equipment and industrial applications requiring high reliability and long lifespan. Attached Figure Description

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 This is a cross-sectional view of the mating structure of a frequency conversion cable according to this utility model;

[0019] Figure 2 This is a schematic diagram of the structural cross-section of the first cable in a frequency conversion cable according to this utility model;

[0020] Figure 3 This is a schematic diagram of the structural cross-section of the second cable in a frequency conversion cable according to this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the first cable of the variable frequency cable of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the second cable of a frequency conversion cable according to this utility model;

[0023] Figure 6 This is a schematic diagram of the fixing structure in the second cable of a frequency conversion cable according to this utility model;

[0024] Figure 7This is a schematic diagram of the protective sleeve in a frequency conversion cable according to this utility model from one perspective.

[0025] Figure 8 This is a structural cross-sectional view of a protective sleeve for a frequency conversion cable according to this utility model;

[0026] In the diagram: 1-first cable, 110-cable core, 111-concave arc surface, 112-plug channel, 120-insulation layer, 130-filling layer, 140-isolation layer, 150-sheath layer, 151-flange, 152-fixing groove, 1521-channel;

[0027] 2-Second cable, 210-Cable core, 211-Convex arc surface, 220-Insulation layer, 230-Filling layer, 240-Insulation layer, 250-Sheath layer, 2501-Elastic sheath section, 2502-Lower sheath section, 251-Button, 252-Snap, 2521-Protrusion, 253-Spring, 254-Sliding groove, 2541-Groove;

[0028] 3-Protective sleeve, 310-Through hole, 320-Slot, 330-Fastener. Detailed Implementation

[0029] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0030] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0031] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] like Figures 1-8As shown, the present invention includes a first cable and a second cable 2 plugged together; a concave arc surface 111 is provided at the core connection end of the first cable 1, and a convex arc surface 211 is provided at the core connection end of the second cable 2, the convex arc surface 211 of the second cable 2 being adapted to the concave arc surface 111 of the first cable 1; a fixing groove 152 is provided on the sheath layer at the plug-in point of the first cable 1, and an elastic sheath section 2501 is provided at the plug-in point of the second cable 2, a buckle is provided on the elastic sheath section 2501, the buckle of the second cable 2 is inserted into the fixing groove 152 of the first cable 1 to achieve a fixed connection between the two cables; the length of the buckle of the second cable 2 extending out of the end face of the elastic sheath section 2501 is less than the distance from the fixing groove 152 to the outer end face of the sheath layer 150, so that when the buckle 252 cooperates with the fixing groove 152, it will compress the elastic sheath section 2501 of the second cable 2, further stabilizing the tight fit between the core of the first cable 1 and the core of the second cable 2.

[0033] Understandably, such as Figure 1 As shown, one end of the first cable 1 and the second cable 2 are connected by a plug-in connection, ensuring convenient and stable connection. The core connection end of the first cable 1 has a concave arc surface 111. The core connection end of the second cable 2 has a convex arc surface 211, which matches the concave arc surface 111. Through the cooperation of the concave and convex arc surfaces, the contact area between the cable cores is increased, reducing the possibility of poor contact and improving the stability and reliability of signal transmission. This improves connection stability, effectively reduces contact resistance, improves the stability and efficiency of current transmission, and reduces the risk of overheating due to poor contact. In the event of bending due to mechanical stress during use, the cooperation of the concave and convex arc surfaces can prevent cable power loss.

[0034] A fixing groove 152 is provided on the sheath layer 150 at the insertion point of the first cable 1. A flexible sheath section 2501 is provided at the insertion point of the second cable 2, and a buckle 252 is provided on the flexible sheath section 2501. The buckle 252 of the second cable 2 is inserted into the fixing groove 152 of the first cable 1 to achieve a fixed connection between the two cables. This prevents loosening or detachment due to external forces and improves the connection's strength.

[0035] The length of the clip 252 extending beyond the end face of the elastic sheath section 2501 of the second cable 2 is less than the distance from the fixing groove 152 to the outer end face of the sheath layer 150. When the clip 252 is inserted into the fixing groove 152, the elastic sheath section 2501 is compressed, thereby further securing the tight fit between the cable cores. The design of the elastic sheath section 2501 and the clip 252 makes cable insertion more convenient, requiring no complicated tools or operations, reducing installation difficulty. Improved installation convenience: The compression design of the elastic sheath section 2501 can adapt to certain mechanical stress and vibration, ensuring long-term stable operation in complex environments (such as industrial equipment, frequency converters, etc.). Improved adaptability: The elastic sheath section 2501 not only provides a fixing function but also has a certain buffering function, protecting the cable core from external mechanical stress and extending the cable's service life.

[0036] This variable frequency cable design significantly improves connection stability, mechanical robustness, and adaptability by optimizing the core connection and sheath fixing structure, making it particularly suitable for variable frequency equipment and industrial applications requiring high reliability and long lifespan.

[0037] Furthermore, such as Figure 6 As shown, a sliding groove 254, a spring 253, and a button 251 are also provided at the second cable connector; the buckle 252 is disposed in the sliding groove 254, and the inner surfaces of both the sliding groove 254 and the buckle 252 are provided with grooves 2541 for fixing the spring 253, and the buckle 252 slides in the sliding groove 254; the button 251 is embedded in the outer surface of the second cable 2 for controlling the sliding of the buckle 252; the buckle 252 is adapted to the fixing groove 152 for fixing the first cable 1 and the second cable 2.

[0038] Specifically, the latch 252 is disposed within the sliding groove 254. Both the sliding groove 254 and the inner surface of the latch 252 are designed with grooves 2541 for fixing the spring 253, thus providing elastic support for the latch 252. The latch 252 can slide freely within the sliding groove 254 and automatically reset due to the elasticity of the spring 253. A button 251 is embedded in the outer surface of the second cable 2 for manually controlling the sliding of the latch 252. When connection is required, pressing the button 251 causes the latch 252 to slide within the sliding groove 254 and compress the spring 253. A vertical protrusion 2521 extends from the latch 252 and enters the fixing groove 152 along the channel 1521. When the first cable 1 and the second cable 2 are inserted into place, the latch 252 automatically resets under the elastic force of the spring 253, tightly engaging with the fixing groove 152, thereby firmly fixing the first cable 1 and the second cable 2 together. The fixed structure design not only facilitates operation but also effectively prevents loosening of connections due to vibration or external forces, significantly improving the reliability and service life of the frequency converter cable under complex operating conditions. Simultaneously, the simple operation of button 251 allows for quick cable connection and disconnection, greatly enhancing efficiency. The entire design ensures electrical performance while also considering mechanical stability and ease of operation. The interlocking structure between the protrusion 2521 and the fixing groove 152 further enhances connection stability, ensuring reliable electrical and mechanical connections during long-term use. It is also suitable for applications requiring frequent plugging and unplugging or operating in vibration-prone environments.

[0039] The first cable 1 and the second cable 2 are quickly connected by end plugging, and are equipped with a protective sleeve 3, forming a dual protection mechanism of mechanical locking and physical protection.

[0040] Furthermore, the protective sleeve 3 is made of ABS plastic.

[0041] ABS plastic has high impact resistance, effectively protecting cables from external physical impacts or mechanical damage, especially in applications where cables need to be frequently bent or subjected to external forces. The smooth and wear-resistant surface of ABS plastic reduces damage caused by friction during use, extending the cable's lifespan. ABS plastic has excellent electrical insulation properties, effectively preventing current leakage or short circuits, ensuring the safety and reliability of the cable. ABS plastic maintains stable insulation performance within a certain voltage range, making it suitable for cables of medium and low voltage ratings. ABS plastic has good toughness and elasticity, maintaining its shape when bent or stretched without easily breaking.

[0042] In one embodiment, a protective sleeve 3 made of ABS plastic is used to protect the connection between the first cable 1 and the second cable 2. It also provides insulation, chemical resistance, mechanical properties, and processability. By using ABS plastic, the cable can better adapt to complex working environments, improving reliability and service life.

[0043] In one embodiment, such as Figure 1 As shown, one end of the composite core of the first cable 1 is provided with a recessed insertion channel 112, and the core 210 of the second cable 2 extends outward for a period of time, the length of which is adapted to the insertion channel 112 of the first cable 1.

[0044] Understandably, the length of the extended cable core 210 is adapted to the length of the insertion channel 112 of the first cable 1, thereby enabling the insertion of the first cable 1 and the second cable 2. Specifically, the cable core 110 of the first cable 1 is recessed inward, while the cable core 210 of the second cable 2 extends outward, with the extension length matching the length of the cable core interface to ensure the stability and reliability of the connection.

[0045] Furthermore, such as Figures 2-3 As shown, both the first cable 1 and the second cable 2 include a composite core, a filling layer, an insulating layer, and a sheath layer;

[0046] The composite cable core includes a cable core and an insulation layer. The insulation layer is cross-linked polyethylene and wraps around the cable core, which is made of copper.

[0047] Understandably, in a preferred embodiment, the insulation layer 120 of the first cable 1 is cross-linked polyethylene. In this embodiment, cross-linked polyethylene is a material in which cross-linking structures are formed between polyethylene molecular chains through chemical or physical methods, exhibiting excellent heat resistance, mechanical properties, chemical corrosion resistance, and electrical insulation properties. In another preferred embodiment, the insulation layer 220 of the second cable 2 is cross-linked polyethylene. In this embodiment, cross-linked polyethylene is formed by introducing cross-linking bonds between polyethylene molecular chains, transforming it from a linear structure to a three-dimensional network structure, thereby significantly improving its physical and chemical properties. The heat resistance temperature can be increased to over 100°C, strength, hardness, and creep resistance are significantly improved, chemical corrosion resistance is good, exhibiting good tolerance to various chemical substances, and excellent electrical insulation properties. The insulation layer encapsulates the cable core, and copper, with its excellent electrical conductivity, contributes to the cable's superior conductivity.

[0048] This application uses cross-linked polyethylene as the material for the insulation layer 120 in the first cable 1 and the insulation layer 220 in the second cable 2, which further improves the waterproof protection of the high-voltage cable, ensures good insulation performance, and is also safer and more environmentally friendly.

[0049] Furthermore, Figures 2-3 As shown, the filling layer wraps around the composite cable core, and the filling layer is made of glass fiber rope.

[0050] Understandably, in a preferred embodiment, the filling layer 130 of the first cable 1 is made of fiberglass rope. Fiberglass is an engineering material with advantages such as non-combustibility, corrosion resistance, high temperature resistance, low thermal absorption, and low deformation coefficient. In another preferred embodiment, the filling layer 230 of the second cable 2 is made of fiberglass rope. The fiberglass rope is made of high-temperature resistant, high-strength fiberglass, woven using a special process. It is a woven elastic fiberglass rope with key properties such as high temperature resistance, corrosion resistance, and high strength. This application uses fiberglass rope as the material for the filling layer 130 in the first cable 1 and the filling layer 230 in the second cable 2. Preferably, the cross-sectional thickness of the fiberglass rope is 0.3 mm. This thickness of fiberglass rope as a filling layer can effectively protect the cable, improving both the cable insulation and flame retardancy.

[0051] Furthermore, such as Figures 2-3 As shown, the insulating layer encloses the filling layer, and the insulating layer is chlorosulfonated polyethylene.

[0052] Understandably, in a preferred embodiment, the insulating layer 140 of the first cable 1 is chlorosulfonated polyethylene. Chlorosulfonated polyethylene is a special chlorine-containing elastomer material with a highly saturated chemical structure, obtained by chlorination and chlorosulfonation reaction of polyethylene as the main raw material. It belongs to a high-performance special rubber variety. Its appearance is a white or milky white elastic material with thermoplasticity. Due to the presence of chlorosulfonyl active groups in its molecular structure, it exhibits high activity, particularly excelling in resistance to chemical media corrosion, ozone oxidation, oil erosion, and flame retardancy. It also possesses weather resistance, heat resistance, resistance to ionizing radiation, low-temperature resistance, abrasion resistance, electrical insulation, and excellent mechanical properties. In another preferred embodiment, the insulating layer 240 of the second cable 2 is chlorosulfonated polyethylene. As a high-performance material, chlorosulfonated polyethylene has excellent ozone resistance, weather resistance, oil resistance, and electrical insulation properties.

[0053] In this application, chlorosulfonated polyethylene is used as the material for the insulating layer 140 of the first cable 1 and the insulating layer 240 of the second cable 2. Chlorosulfonated polyethylene has good physical and mechanical properties, aging resistance, heat and low temperature resistance, flame retardancy, abrasion resistance and electrical insulation.

[0054] Furthermore, such as Figures 2-3 As shown, the sheath layer wraps around the isolation layer. The elastic sheath segment 2501 is a polyurethane sheath.

[0055] like Figure 1 and Figure 5As shown, the sheath layer 250 of the second cable 2 includes an elastic sheath section 2501 and a lower sheath section 2502. In one embodiment, the polyurethane sheath has excellent elasticity, enabling it to adapt to complex mechanical structures and moving parts, providing good cushioning and protection. Polyurethane material has high abrasion resistance, allowing for long-term use in high-friction environments, reducing sheath wear and replacement frequency. The polyurethane sheath has good resistance to many chemicals, resisting corrosion from substances such as oil, water, acids, and alkalis. In oily environments, the polyurethane sheath maintains stable performance and will not deform or be damaged by oil corrosion. The polyurethane sheath maintains good flexibility and elasticity even at low temperatures and will not become brittle due to temperature changes. The polyurethane sheath has good UV resistance and anti-aging properties, enabling long-term use in outdoor environments. The elastic sheath section 2501 uses a polyurethane sheath, which has high elasticity, abrasion resistance, corrosion resistance, oil resistance, low-temperature resistance, and aging resistance. Furthermore, the polyurethane sheath is lightweight and does not increase the burden on mechanical parts. Polyurethane sheaths have a long service life, low maintenance costs, and high cost-effectiveness.

[0056] In one embodiment, the sheath layer is made of neoprene rubber. It is understood that the sheath layer 150 of the first cable 1 and the lower sheath 2502 of the second cable 2 can also be made of neoprene rubber. Neoprene rubber cables can operate for extended periods in oily environments while maintaining good electrical performance and mechanical strength. Neoprene rubber cables can be used in environments with strong corrosive media such as acids and alkalis without affecting their electrical performance. Neoprene rubber cables can be used normally in extreme high and low temperature environments and can adapt to various harsh climatic conditions. This application uses neoprene rubber as the material for the outermost sheath layer, giving it good oil resistance, excellent acid and alkali resistance, and good high and low temperature resistance.

[0057] Understandably, the fixing structure of the second cable 2 is designed to achieve a stable connection after it is plugged into the first cable 1. During the plugging process, the operator only needs to press the buttons 251 on both sides of one end of the second cable 2. The latches 252 inside the buttons 251 are then engaged, and the spring 253 is compressed. At this time, the second cable 2 is smoothly pushed into the core interface of the first cable 1, and the latches 252 will slide smoothly into the channel 1521 on one side of the fixing groove 152 on the first cable 1. When the latches 252 reach the position of the fixing groove 152, the buttons 251 are released, and the spring 253 immediately releases its elastic potential energy, pushing the latches 252 and buttons 251 to reset. At this time, the protrusions 2521 extending from the latches 252 precisely engage in the fixing groove 152, completing the secure connection between the first cable 1 and the second cable 2.

[0058] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A frequency varying cable, characterized by: Including the first and second cables that are plugged together; The first cable has a concave arc surface at the core connection end, and the second cable has a convex arc surface at the core connection end. The convex arc surface of the second cable is adapted to the concave arc surface of the first cable. A fixing groove is provided on the sheath layer of the first cable plug-in point, and an elastic sheath section is provided at the second cable plug-in point. A buckle is provided on the elastic sheath section. The buckle of the second cable is inserted into the fixing groove of the first cable to achieve a fixed connection between the two cables. The length of the second cable's buckle extending beyond the elastic sheath section is less than the distance from the fixing groove to the outer end face of the first cable's sheath layer. This allows the buckle to compress the elastic sheath section of the second cable when it engages with the fixing groove, further securing the tight fit between the cores of the first and second cables.

2. The frequency conversion cable according to claim 1, characterized in that: The second cable connector is also provided with a sliding groove, a spring, and a button; The buckle is disposed in the sliding groove, and both the inner surfaces of the sliding groove and the buckle are provided with grooves for fixing the spring. The buckle slides in the sliding groove. The button is embedded in the outer surface of the elastic sheath section and is used to control the sliding of the buckle; The buckle is adapted to the fixing groove and is used to fix the first cable and the second cable.

3. A frequency conversion cable according to claim 1 or 2, characterized in that: The outer surface of the sheath of the first cable extends a flange, which is used to connect the protective sleeve after the first cable and the second cable are plugged in. The protective case is made of ABS plastic.

4. A frequency conversion cable according to claim 3, characterized in that: Both the first cable and the second cable include a composite core, a filling layer, an insulating layer, and the sheath layer; The composite cable core includes a cable core and an insulation layer. The insulation layer is cross-linked polyethylene and wraps around the cable core, which is made of copper.

5. A frequency conversion cable according to claim 4, characterized in that: The filling layer encapsulates the composite cable core, and the filling layer is made of glass fiber rope.

6. A frequency conversion cable according to claim 4, characterized in that: The insulating layer encloses the filling layer, and the insulating layer is chlorosulfonated polyethylene.

7. A frequency conversion cable according to claim 4, characterized in that: The sheath layer encloses the insulating layer.

8. A frequency conversion cable according to claim 4, characterized in that: The elastic sheath section is a polyurethane sheath.

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