Three-core European standard plug cord

Abstract

The utility model relates to the technical field of plug cord manufacturing, in particular to a three-core European standard plug cord, which is formed by connecting a three-pole plug and a cable. The cable is formed by compounding a cable core and an insulating plastic sleeve. The cable core is composed of a live wire, a zero wire and a ground wire. The three-pole plug comprises a high-thermal-conductivity plastic insulator, a live wire insertion piece, a zero wire insertion piece, a ground wire insertion piece and a current limiting assembly. The current limiting assembly is pre-buried in the high-thermal-conductivity plastic insulator and comprises a first wire, a second wire and a resistor. The resistor is electrically connected between the live wire insertion piece and the zero wire insertion piece. Therefore, when the resistance value of the cable core exceeds a threshold value, the shunted electric energy is consumed by the resistor, and the generated heat is discharged through the high-thermal-conductivity plastic insulator; or, when the contact area is not uniform or the contact is poor, the shunt current can be effectively balanced due to the existence of the current limiting assembly, so that the local current overload phenomenon can be reduced or avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of plug wire manufacturing, in particular to a three-core European standard plug wire. Background Art

[0002] Three-core plug cables are typically used in high-power power supply applications, such as refrigerators, washing machines, air conditioners, and charging new energy vehicles. Under continuous high-power supply conditions, three-core plug cables generate severe heat, which in turn affects the stability and safety of the power supply, and also results in high energy loss. The reasons for this are: 1) During application, the supply current is too large, and the cable core has a certain resistance, which inevitably causes the line to heat up. Over time, the heat generation exceeds the standard, and as the temperature rises, the cable core resistance also increases; 2) The contact area between the three-core plug cable and the socket is uneven or poor contact occurs frequently, resulting in current overload and subsequent local overheating of the three-core plug cable. Therefore, technical personnel are urgently needed to solve the above problems. Utility Model Content

[0003] Therefore, in view of the above-mentioned existing problems and defects, the designers of the present invention collected relevant information, conducted multiple evaluations and considerations, and, after continuous experimentation and modification by technicians with many years of R&D experience in this industry, ultimately led to the emergence of the three-core European standard plug cable.

[0004] In order to solve the above-mentioned technical problems, the utility model relates to a three-core European standard plug cord, which is connected by a three-pole plug and a cable. The cable is composed of a cable core and an insulating plastic sheath. The cable core is wrapped by the insulating plastic sheath and is isolated from the external environment. The cable core is composed of three parallel live wires, neutral wires and ground wires. The three-pole plug includes a high-thermal-conductivity plastic insulator, a live wire plug, a neutral wire plug and a ground wire plug. The live wire plug, the neutral wire plug and the ground wire plug are all rooted and fixed in the high-thermal-conductivity plastic insulator, and their tail ends are electrically connected to the live wire, the neutral wire and the ground wire respectively. The three-pole plug also includes a current limiting component. The current limiting component is pre-buried in the high-thermal-conductivity plastic insulator and serves as an electrical conduction transition between the live wire plug and the neutral wire plug. The current limiting component includes a first conductor, a second conductor and a resistor. One end of the resistor is electrically connected to the live wire plug by means of a first wire, and the other end of the resistor is electrically connected to the neutral wire plug by means of a second wire.

[0005] As a further improvement to the technical solution disclosed in this utility model, the hot wire insert has a first insertion cavity formed at its rear end. The neutral wire insert has a second insertion cavity formed at its rear end. The ground wire insert has a third insertion cavity formed at its rear end. The hot wire and the first conductor are clustered and inserted together in the first insertion cavity. The neutral wire and the second conductor are clustered and inserted together in the second insertion cavity; the ground wire is inserted independently in the third insertion cavity.

[0006] As a further improvement of the technical solution disclosed in this utility model, the model of the live wire is RV1.5~2.5mm 2 ; The model of the neutral line is BV1.5~2.5mm 2 ; The model of the ground wire is BV1.5~2.5mm 2 ;The resistor model is SCF-050 1 / 2W.

[0007] As a further improvement to the technical solution disclosed in this utility model, a flexible anti-bending section extends backward from the tail end of the high-thermal-conductivity plastic insulator. With the help of the flexible anti-bending section, the minimum bending radius of the cable is limited when the base bends under external force.

[0008] As a further improvement to the technical solution disclosed in this utility model, the flexible anti-bending section is formed with a first bending avoidance groove and a second bending avoidance groove disposed in opposite directions. The number of the first bending avoidance groove and the second bending avoidance groove is set to multiple, and they are arranged linearly along the length of the flexible anti-bending section.

[0009] As a further improvement of the technical solution disclosed in the present invention, a through-shaped heat dissipation gap is formed in the high thermal conductivity plastic insulator directly above the resistor.

[0010] As a further improvement to the technical solution disclosed in the present utility model, insertion and extraction force applying portions are formed on both opposite side walls of the high thermal conductivity plastic insulator.

[0011] As a further improvement of the technical solution disclosed in the present invention, the plugging and unplugging force applying portion is composed of a plurality of linear arrays along the height direction of the high thermal conductivity plastic insulator, and the friction-increasing convex strips are formed by continuing to extend outward from the high thermal conductivity plastic insulator.

[0012] By adopting the above technical solution, a first current loop is formed between the live wire, the neutral wire, and the electrical appliance, while a second current loop is formed between the live wire, the neutral wire, and the resistor. In one case, as the temperature continues to rise, when the total resistance of the cable core exceeds a threshold, more current is diverted to the second current loop, where the resistor continuously consumes electrical energy, and the generated heat is promptly discharged to the external environment through the high-thermal-conductivity plastic insulator. In another case, when the contact area is uneven or the contact is poor, the coexistence of the first and second current loops can effectively balance the diverted current, which not only helps reduce or avoid the occurrence of local current overloads, paving the way for avoiding local overheating of three-core European plug cables and reducing their overall heat generation, but also effectively prevents damage to electrical appliances due to instantaneous overloads. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 It is a structural schematic diagram of the three-core European standard plug wire disclosed in the utility model.

[0015] Figure 2 It is a side view of a three-pole plug in a three-core European standard plug cable disclosed in the utility model.

[0016] Figure 3 The utility model is a front view of a three-pole plug in a three-core European standard plug cable disclosed in the utility model.

[0017] Figure 4 It is a cross-sectional view of the cable in the three-core European standard plug cable disclosed in the utility model.

[0018] Figure 5 The utility model discloses a wiring diagram between a current limiting component and a live wire plug and a neutral wire plug in a three-core European standard plug cable.

[0019] Figure 6 It is a three-dimensional schematic diagram of the current limiting component in the three-core European standard plug cable disclosed in the utility model.

[0020] 1-Three-pole plug; 11-High thermal conductivity plastic insulator; 111-Flexible anti-bending section; 1111-First bending avoidance groove; 1112-Second bending avoidance groove; 112-Heat dissipation notch; 113-Plug-in and pull-out force-applying portion; 1131-Friction-increasing ridge; 12-Live wire blade; 121-First insertion cavity; 13-Neutral wire blade; 131-Second insertion cavity; 14-Ground wire blade; 141-Third insertion cavity; 15-Current limiting component; 151-First conductor; 152-Second conductor; 153-Resistor; 2-Cable; 21-Cable core; 211-Live wire; 212-Neutral wire; 213-Ground wire; 22-Insulating plastic sleeve. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the present invention in conjunction with specific embodiments. Figure 1 The structure diagram of the three-core European standard plug cable disclosed in the present invention is shown in FIG. It is known that the three-pole plug 1 and the cable 2 are connected. Figure 4As shown in FIG, the cable 2 is composed of a cable core 21 and an insulating plastic sheath 22. The cable core 21 is wrapped by the insulating plastic sheath 22 and isolated from the external environment. The cable core 21 is composed of three parallel live wires 211, neutral wire 212 and ground wire 213. Figure 2 、 3 As shown in FIG, the three-pole plug 1 is mainly composed of a high thermal conductivity plastic insulator 11, a live wire blade 12, a neutral wire blade 13, a ground wire blade 14, and a current limiting component 15. Among them, the live wire blade 12, the neutral wire blade 13, and the ground wire blade 14 are all rooted and fixed in the high thermal conductivity plastic insulator 11, and their tail ends are electrically connected to the live wire 211, the neutral wire 212, and the ground wire 213 respectively. Figure 1 、 2 As shown in FIG. 5 , the current limiting component 15 is pre-buried in the high thermal conductivity plastic insulator 11 and serves as an electrical conductive transition between the live wire plug 12 and the neutral wire plug 13 .

[0022] like Figure 6 As shown in FIG, the current limiting component 15 is mainly composed of a first wire 151, a second wire 152, and a resistor 153. One end of the resistor 153 is electrically connected to the live wire blade 12 via the first wire 151, and the other end is electrically connected to the neutral wire blade 13 via the second wire 152.

[0023] In actual applications, current limiting component 15 generates a significant amount of heat due to the current flowing through it, which is dissipated into the external environment via the high-thermal-conductivity plastic insulator 11. Therefore, the high-thermal-conductivity plastic insulator 11 is preferably made of a thermally conductive plastic with both high thermal conductivity and high insulation properties. Thermally conductive plastics are formed by adding high-thermal-conductivity reinforcing materials to engineering plastics or general-purpose plastics. They possess the heat transfer properties of metals and ceramics while retaining the other design, performance, and cost advantages of conventional plastics.

[0024] The working mechanism and beneficial technical effects of the three-core European plug cable are comprehensively analyzed as follows: After preparation, a first current loop is formed between the live wire 211, the neutral wire 212, and the electrical appliance. Simultaneously, a second current loop is formed between the live wire 211, the neutral wire 212, and the resistor 153. In certain situations, as the temperature continues to rise, when the total resistance of the cable core 21 exceeds a threshold, more current is diverted to the second current loop, where resistor 153 continuously consumes energy, and the generated heat is promptly discharged to the outside environment through the highly thermally conductive plastic insulator 11. In other situations, when the contact area relative to the socket is uneven or poor, the coexistence of the first and second current loops effectively balances the diverted current, reducing or avoiding local current overloads, paving the way for preventing local overheating of the three-core European plug cable and reducing its overall heat output. Furthermore, it effectively prevents damage to the appliance due to transient overloads.

[0025] In addition to the above mechanism analysis, after the three-core European plug line was prepared, it was also subjected to laboratory performance tests, mainly for thermal performance and electrical performance tests. The specific experimental conditions were: the model of the live wire 211 was RV2mm 2 The models of the neutral wire 212 and the ground wire 213 are both BV2mm 2 The model of resistor 153 is SCF-050 1 / 2W. Test results show that compared with conventional designs, the operating temperature of cable 2 of the new design structure is well controlled, and its electrical performance is also optimized to a certain extent.

[0026] As is known, the live wire 211, the neutral wire 212, and the ground wire 213 can adopt a variety of design structures to achieve electrical conduction with the live wire plug 12, the neutral wire plug 13, and the ground wire plug 14 respectively. However, here we recommend an implementation scheme that is easy to implement, does not require soldering, has high electrical conduction stability, and has a relatively small contact resistance value. Specifically, as follows: Figure 5As shown in FIG, a first insertion cavity 121 is formed at the tail end of the live wire plug 12. A second insertion cavity 131 is formed at the tail end of the neutral wire plug 13. A third insertion cavity 141 is formed at the tail end of the ground wire plug 14. When preparing a three-core European standard plug cable, the live wire 211, the neutral wire 212, and the ground wire 213 are first stripped to expose a sufficient length of each metal wire, and then the three are inserted into the first insertion cavity 121, the second insertion cavity 131, and the third insertion cavity 141 one by one. Subsequently, a clamping force is applied to the tails of the live wire plug 12, the neutral wire plug 13, and the ground wire plug 14 in sequence until the first insertion cavity 121, the second insertion cavity 131, and the third insertion cavity 141 undergo a "necking" deformation, and the live wire 211, the neutral wire 212, and the ground wire 213 are stably clamped, which means that good electrical conduction is achieved between the three and the live wire plug 12, the neutral wire plug 13, and the ground wire plug 14 respectively.

[0027] Of course, in order to achieve good electrical conduction and relatively low contact resistance between the first wire 151 and the second wire 152 and the live wire plug 12 and the neutral wire plug 13, as a further optimization of the above technical solution, the same Figure 5 As shown in FIG, the first conductor 151 and the live wire 211 are clustered and inserted into the first insertion cavity 121 . The second conductor 152 and the neutral wire 212 are clustered and inserted into the second insertion cavity 131 .

[0028] It is known that according to consumer complaints, after a period of use, the root of the cable 2 (near the three-pole plug 1) is very easy to break. The reason is that during long-term use, the cable 2 is often bent, twisted or pulled forcefully. In addition, the closer to the connection root, the smaller the maximum bending radius. In view of this, as a further optimization of the above technical solution, Figure 1 、 2 As shown in Figures 3 and 4, a flexible anti-bending section 111 continues to extend backward from the tail end of the high thermal conductivity plastic insulator 11. With the help of the flexible anti-bending section 111, the minimum bending radius of the cable 2 when the root is bent by an external force can be limited. A first bending avoidance groove 1111 and a second bending avoidance groove 1112 are formed on the flexible anti-bending section 111 at the same time. The number of the first bending avoidance groove 1111 and the second bending avoidance groove 1112 are both set to multiple, and are linearly arranged along the length direction of the flexible anti-bending section 111. In this way, when the cable 2 is bent, twisted or strongly pulled, the posture, relative spacing value and shape of the first bending avoidance groove 1111 and the second bending avoidance groove 1112 all undergo adaptive changes.

[0029] As is known, in actual applications, the heat generated by the resistor 153 is discharged through the high thermal conductivity plastic insulator 11. However, when the heat dissipation rate is lower than the heat generation rate, the high thermal conductivity plastic insulator 11 continues to heat up due to heat accumulation, which not only burns the three-core European standard plug cable but also makes it difficult for consumers to perform plugging and unplugging operations. In view of this, as a further optimization of the above technical solution, Figure 2 As shown in FIG, a through-shaped heat dissipation gap 112 is formed in the high thermal conductivity plastic insulator 11 directly above the resistor 153. In this way, low-temperature airflow can freely pass through the heat dissipation gap 112, and in this process, a large amount of heat is immediately taken out and discharged to the external environment.

[0030] Furthermore, by Figure 2 As can be clearly seen in the figure, insertion and removal force-applying portions 113 are formed on both opposing side walls of the highly thermally conductive plastic insulator 11, thereby facilitating quick and effortless insertion and removal of the three-pole plug 1. The insertion and removal force-applying portions 113 are comprised of a plurality of friction-enhancing ridges 1131 extending outward from the highly thermally conductive plastic insulator 11 and arranged in a linear array along the height of the highly thermally conductive plastic insulator 11.

[0031] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A three-core European plug cord, comprising a three-pole plug and a cable; the cable is composed of a cable core and an insulating plastic sheath; the cable core is wrapped in the insulating plastic sheath to isolate it from the external environment; the cable core is composed of three parallel live wires, a neutral wire, and a ground wire; the three-pole plug includes a high-thermal-conductivity plastic insulator, a live wire blade, a neutral wire blade, and a ground wire blade; the live wire blade, the neutral wire blade, and the ground wire blade are all rooted and fixed in the high-thermal-conductivity plastic insulator, and their tail ends are electrically connected to the live wire, the neutral wire, and the ground wire, respectively, in a one-to-one correspondence. The three-pole plug further includes a current limiting component; the current limiting component is pre-buried in the high thermal conductivity plastic insulator and serves as an electrical conductive transition between the live wire plug and the neutral wire plug; the current limiting component includes a first wire, a second wire, and a resistor; One end of the resistor is electrically connected to the live wire plug by means of the first wire, and the other end of the resistor is electrically connected to the neutral wire plug by means of the second wire.

2. The three-core European standard plug cable according to claim 1, characterized in that The tail end of the live wire plug is formed with a first plug-in cavity; the tail end of the neutral wire plug is formed with a second plug-in cavity; the tail end of the ground wire plug is formed with a third plug-in cavity; the live wire and the first wire are clustered and inserted into the first plug-in cavity together; the neutral wire and the second wire are clustered and inserted into the second plug-in cavity together; the ground wire is independently inserted into the third plug-in cavity.

3. The three-core European standard plug cable according to claim 1, characterized in that , the model of the live wire is RV1.5~2.5mm 2 The model of the neutral line is BV1.5~2.5mm 2 The ground wire model is BV1.5~2.5mm 2 ;The model of the resistor is SCF-050 1 / 2W.

4. The three-core European plug cable according to any one of claims 1 to 3, characterized in that A flexible anti-bending section continues to extend backward from the tail end of the high thermal conductivity plastic insulator; with the assistance of the flexible anti-bending section, the minimum bending radius of the cable can be limited when the root is bent by external force.

5. The three-core European standard plug cable according to claim 4, characterized in that The flexible anti-bending section is simultaneously formed with a first bending avoidance groove and a second bending avoidance groove arranged opposite to each other; the number of the first bending avoidance groove and the second bending avoidance groove is set to multiple, and are linearly arranged along the length direction of the flexible anti-bending section.

6. The three-core European standard plug cable according to any one of claims 1 to 3, characterized in that , located directly above the resistor, a through-shaped heat dissipation gap is formed in the high thermal conductivity plastic insulator.

7. The three-core European standard plug cable according to any one of claims 1 to 3, characterized in that , plugging and unplugging force applying parts are formed on the two opposite side walls of the high thermal conductivity plastic insulator.

8. The three-core European standard plug cable according to claim 7, characterized in that The plugging and unplugging force applying portion is composed of a plurality of linear arrays along the height direction of the high thermal conductivity plastic insulator, and is formed by the high thermal conductivity plastic insulator continuing to extend outward to form friction-increasing convex strips.

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