A temperature control plug wire

Abstract

The present invention relates to the technical field of plug wire manufacturing, in particular to a temperature-controlled plug wire, which is connected by a three-pole plug and a cable. The cable is composed of a cable core and an insulating plastic sleeve. The cable core is bundled with a live wire, a neutral wire, a ground wire and a signal control wire. The live wire plug, the neutral wire plug and the ground wire plug are directly electrically conductive with the live wire, the neutral wire and the ground wire respectively. The temperature switch is hidden in the plastic insulator and is electrically conductive with the signal control line. With the assistance of a ceramic heat conductor, the temperature switch can indirectly sense the real-time temperature of the live wire plug and the neutral wire plug. During the use of the temperature-controlled plug wire, the temperature at the live wire plug and the neutral wire plug will be transmitted to the temperature switch in real time through the ceramic heat conductor. When the temperature rises to a preset temperature value, the temperature sensing element of the temperature switch is heated to generate internal stress and quickly actuates to open the contact, and the signal control line cannot form a current loop, so that the power supply to the cable core is interrupted due to being controlled by the power control box.

Description

Technical Field

[0001] The invention relates to the technical field of plug wire manufacturing, in particular to a temperature-controlled plug wire. Background Art

[0002] Three-pole plug wires are usually used in high-power power supply occasions, such as refrigerators, washing machines, air conditioners, and new energy vehicle charging. Under continuous high-power power supply, the three-pole plug wire and the sockets that match it will heat up seriously, which will affect the stability and safety of the power supply, and the three-pole plug wire, power cable core or socket will be burned from time to time. The reasons are as follows: 1) In the actual use process, the power supply current is too large, and the cable core has a certain resistance, which will inevitably cause the line to heat up. As time accumulates, the heat generation exceeds the standard, and as the temperature rises, the resistance value of the cable core also increases; 2) The contact area between the three-pole plug wire and the socket is uneven or the contact is poor, which leads to current overload. In addition, the heat dissipation of the three-pole plug wire and the socket does not meet the standard, which causes the three-pole plug wire, power cable core or socket to burn due to local overheating. Therefore, it is urgent for technical personnel to solve the above problems. Summary of the invention

[0003] Therefore, in view of the above existing problems and defects, the designers of the present invention collected relevant information, conducted multiple evaluations and considerations, and continued to experiment and modify after many years of R&D experience in this industry, which ultimately led to the emergence of the temperature control plug line.

[0004] In order to solve the above technical problems, the present invention relates to a temperature control plug line, which is connected by a three-pole plug and a cable. The cable is composed of a cable core and an insulating plastic sleeve. The cable core is bundled by a live wire, a neutral wire, a ground wire and a signal control wire wrapped in a parallel insulating plastic sleeve. The signal control line is used to control the power control box. The three-pole plug includes a stabilizing frame, a plastic insulator, a live wire plug, a neutral wire plug, a ground wire plug, a temperature switch and a ceramic heat conductor. The stabilizing frame serves as a rooting and fixing foundation for the live wire plug, the neutral wire plug, the ground wire plug and the ceramic heat conductor, and it serves as an injection molding growth foundation for the plastic insulator. The live wire plug, the neutral wire plug and the ground wire plug are directly electrically connected to the live wire, the neutral wire and the ground wire respectively. The temperature switch is hidden in the plastic insulator and is electrically connected to the signal control line. With the assistance of the ceramic heat conductor, the temperature switch can indirectly sense the real-time temperature of the live wire plug and the neutral wire plug.

[0005] As a further improvement of the technical solution disclosed in the present invention, the ceramic heat conducting member is composed of a ceramic body, a first heat conducting arm and a second heat conducting arm. An insertion cavity for inserting a temperature switch is formed on the rear end surface of the ceramic body. When the live wire plug, the neutral wire plug, the ground wire plug and the ceramic heat conducting member are rooted and fixed relative to the stabilizing frame, the first heat conducting arm and the second heat conducting arm respectively correspond to the live wire plug and the neutral wire plug and keep in a top contact state.

[0006] As a further improvement of the technical solution disclosed in the present invention, a strip-shaped through groove is formed on the front end surface of the ceramic body.

[0007] As a further improvement of the technical solution disclosed in the present invention, the number of the strip-shaped through grooves is set to multiple, and they are arranged in a linear array along the width direction of the ceramic body.

[0008] As a further improvement of the technical solution disclosed in the present invention, the temperature switch includes a temperature sensing control body and a first lead pin. The first lead pin is led out from the temperature sensing control body and is connected to the signal control line.

[0009] As a further improvement of the technical solution disclosed in the present invention, the temperature switch further includes a second lead pin. The second lead pin is led out from the temperature sensing control body and is connected to the ground wire or the ground wire plug.

[0010] In the technical solution disclosed in the present invention, the temperature switch is a switch using a bimetallic strip as a temperature sensing element. The ceramic thermal conductor has excellent electrical insulation and thermal conductivity. During the use of the temperature control plug line, the temperature at the live wire plug and the neutral wire plug will be transmitted to the temperature switch in real time through the ceramic thermal conductor. When the temperature rises to the preset temperature value, the temperature sensing element of the temperature switch generates internal stress due to heat and quickly operates to open the contact, and the signal control line cannot form a current loop, so that the power supply to the cable core is interrupted due to the control of the power control box, which plays a role of thermal protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0012] Figure 1 It is a three-dimensional schematic diagram from one viewing angle of the first embodiment of the temperature control plug cable disclosed in the present invention.

[0013] Figure 2 It is a three-dimensional schematic diagram from another perspective of the first embodiment of the temperature control plug cable disclosed in the present invention.

[0014] Figure 3 It is a three-dimensional schematic diagram of a three-pole plug in a first embodiment of the temperature control plug wire disclosed in the present invention from one viewing angle.

[0015] Figure 4 It is a three-dimensional schematic diagram of another viewing angle of the three-pole plug in the first embodiment of the temperature control plug wire disclosed in the present invention.

[0016] Figure 5 It is a wiring diagram of a three-pole plug and a cable core in the first embodiment of the temperature control plug wire disclosed in the present invention (with the plastic insulator hidden).

[0017] Figure 6 It is also a three-dimensional schematic diagram of a three-pole plug in the first embodiment of the temperature control plug wire disclosed in the present invention from one viewing angle (with the plastic insulator hidden).

[0018] Figure 7 It is also a three-dimensional schematic diagram of a three-pole plug in another perspective of the first embodiment of the temperature control plug line disclosed in the present invention (with the plastic insulator hidden).

[0019] Figure 8 It is a three-dimensional schematic diagram of a ceramic heat conductor in the first embodiment of the temperature control plug line disclosed in the present invention from one viewing angle.

[0020] Fig. 9 It is a three-dimensional schematic diagram from another perspective of the ceramic heat conductor in the first embodiment of the temperature control plug line disclosed in the present invention.

[0021] Fig.10 It is a wiring diagram of a three-pole plug and a cable core in the second embodiment of the temperature control plug wire disclosed in the present invention (with the plastic insulator hidden).

[0022] 1-three-pole plug; 11-stabilizing frame; 12-plastic insulator; 13-live wire plug; 14-neutral wire plug; 15-ground wire plug; 16-temperature switch; 161-temperature sensing control body; 162-first lead pin; 163-second lead pin; 17-ceramic heat conductor; 171-ceramic body; 1711-insertion cavity; 1712-strip through groove; 172-first heat conducting arm; 173-second heat conducting arm; 2-cable; 21-cable core; 211-live wire; 212-neutral wire; 213-ground wire; 214-signal control line; 22-insulating plastic sleeve. DETAILED DESCRIPTION

[0023] Three-pole plug wires are usually used in high-power power supply situations. For example, when charging new energy vehicles, a three-pole plug wire is used to connect to the socket panel of the charging pile, and a power control box is provided to control the charging current, charging voltage, and the on / off of the charging process. In the fast charging scenario, the high charging current reaches 150-400A, and the vehicle battery can be fully charged in a short time.

[0024] The present invention will be further described in detail below with reference to specific embodiments. Figure 1 , Figure 2 The three-dimensional schematic diagrams of two different perspectives of the first embodiment of the temperature control plug line disclosed in the present invention are respectively shown. It can be seen that it is connected by a three-pole plug 1 and a cable 2. Among them, the cable 2 is composed of a cable core 21 and an insulating plastic sleeve 22. The cable core 21 is bundled by a live wire 211, a neutral wire 212, a ground wire 213 and a signal control line 214 that are parallel and wrapped by an insulating plastic sleeve 22. The signal control line 214 is used to input a control signal to the power control box. The three-pole plug 1 is mainly composed of a stabilizing frame 11, a plastic insulator 12, a live wire plug 13, a neutral wire plug 14, a ground wire plug 15, a temperature switch 16 and a ceramic heat conductor 17. The stabilizing frame 11 serves as a rooting and fixing foundation for the live wire plug 13, the neutral wire plug 14, the ground wire plug 15 and the ceramic heat conductor 17, and it serves as an injection molding growth foundation for the plastic insulator 12. And when the plastic insulator 12 is in the injection-molded cold-setting state, the whole of the stabilizing frame 11, the temperature switch 16 and the ceramic heat-conducting component 17, as well as parts of the live wire plug 13, the neutral wire plug 14 and the ground wire plug 15 are all hidden therein. The live wire plug 13, the neutral wire plug 14 and the ground wire plug 15 are directly electrically connected to the live wire 211, the neutral wire 212 and the ground wire 213 respectively. The temperature switch 16 is inserted into the tail of the ceramic heat-conducting component 17, and it includes a temperature sensing control body 161 and a first lead pin 162. The first lead pin 162 is directly led out from the temperature sensing control body 161, and it is connected to the signal control line 214. Thanks to the thermal conductivity of the ceramic heat-conducting component 17, the temperature switch 16 can indirectly sense the real-time temperature of the live wire plug 13 and the neutral wire plug 14 (such as Figure 2-7 ).

[0025] In the technical solution disclosed in the present invention, the temperature switch 16 is a switch using a bimetallic strip as a temperature sensing element. The ceramic thermal conductor 17 has excellent electrical insulation and thermal conductivity. During the use of the temperature control plug line, the temperature at the live wire plug 13 and the neutral wire plug 14 will be transmitted to the temperature switch 16 in real time through the ceramic thermal conductor 17. When the temperature rises to the preset temperature value, the temperature sensing control body 161 generates internal stress due to heat and acts quickly, opening the contact, and the signal control line 214 cannot form a current loop, so that the power supply is interrupted to the cable core 21 due to the control of the power control box, and the new energy vehicle can interrupt the charging process, which plays a role in thermal protection.

[0026] like Figure 8 , 9 As shown in the figure, the ceramic heat conducting member 17 is composed of a ceramic body 171, a first heat conducting arm 172 and a second heat conducting arm 173. An insertion cavity 1711 for inserting the temperature switch 16 is formed on the rear end surface of the ceramic body 171. When the live wire plug 13, the neutral wire plug 14, the ground wire plug 15 and the ceramic heat conducting member 17 are rooted and fixed relative to the stabilizing frame 11, the first heat conducting arm 172 and the second heat conducting arm 173 respectively correspond to the live wire plug 13 and the neutral wire plug 14 and keep in a top contact state (as shown in FIG. Figure 5 , 6 , as shown in 7).

[0027] Under the design premise that heat can be quickly transferred from the live wire plug 13 and the neutral wire plug 14 to the temperature switch 16, in order to ensure the insertion stability of the temperature switch 16 relative to the ceramic heat conductor 17, and thus avoid the position change or accidental fall-off due to the excessive impact force of the liquid resin during the injection molding process of the plastic insulator 12, as a further optimization of the above technical solution, before the insertion operation of the temperature switch 16 is performed, the insertion cavity 1711 can be pre-filled with thermal conductive silicone (not shown in the figure). The temperature switch 16 can achieve stable insertion and rapid heat conduction with the ceramic heat conductor 17 by virtue of the excellent bonding performance and high thermal conductivity of the thermal conductive silicone.

[0028] After the first batch of temperature-controlled plug cables were put on the market, some southern customers reported that the temperature-controlled plug cables were prone to short circuits in humid environments, which would inevitably affect the safety of the charging process of new energy vehicles. The reason is that due to the insufficient fusion of the materials, when the plastic insulator 12 is injection molded, it is difficult to wrap the live wire plug 13, the neutral wire plug 14, the ground wire plug 15 and the ceramic body 171 without gaps. Some moisture penetrates through the gaps and easily condenses into water on the ceramic body 171, causing the risk of short circuits between the live wire plug 13 and the neutral wire plug 14. In view of this, as a further optimization of the above technical solution, as shown in FIG. Figure 8 , 9As shown in the figure, a strip-shaped through groove 1712 is formed on the front end surface of the ceramic body 171. The number of the strip-shaped through grooves 1712 is set to be multiple, and they are arranged in a linear array along the width direction of the ceramic body 171. In this way, during the use of the temperature control plug line, a large amount of condensed water can be retained in the strip-shaped through groove 1712, thereby effectively preventing the occurrence of a "short circuit" phenomenon caused by direct electrical conduction between the live wire plug 13 and the neutral wire plug 14 due to excessive condensed water.

[0029] Fig.10 The figure shows the wiring diagram of the three-pole plug and the cable core in the second embodiment of the temperature control plug line disclosed in the present invention. It can be seen that the difference compared with the first embodiment is that the temperature switch 16 is grounded. The temperature switch 16 also includes a second lead pin 163. The second lead pin 163 is led out from the temperature sensing control body 161, and is connected to the ground wire 213 or the ground wire plug 15. In this way, the temperature switch 16 not only monitors the temperature changes of the live wire plug 13, the neutral wire plug 14 and the plug-in surface to perform overheating protection, but also ensures that when the temperature switch 16 or related electrical equipment has a leakage, the current can quickly flow back to the ground through the ground wire, thereby protecting the safety of people and equipment.

[0030] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be 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 will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A temperature control plug cable, characterized in that: It is connected by a three-pole plug and a cable; the cable is composed of a cable core and an insulating plastic sleeve; the cable core is bundled by a live wire, a neutral wire, a ground wire and a signal control wire that are parallel and wrapped by the insulating plastic sleeve; the signal control wire is used to control the power control box; the three-pole plug includes a stabilizing frame, a plastic insulator, a live wire plug, a neutral wire plug, a ground wire plug, a temperature switch and a ceramic heat conductor; the stabilizing frame serves as a rooting and fixing foundation for the live wire plug, the neutral wire plug, the ground wire plug and the ceramic heat conductor, and it serves as an injection molding growth foundation for the plastic insulator; the live wire plug, the neutral wire plug and the ground wire plug are directly electrically connected to the live wire, the neutral wire and the ground wire respectively in a one-to-one correspondence; The temperature switch is hidden in the plastic insulator and is electrically connected to the signal control line; with the assistance of the ceramic heat conductor, the temperature switch can indirectly sense the real-time temperature of the live wire plug and the neutral wire plug.

2. The temperature control plug cable according to claim 1, characterized in that The ceramic heat-conducting component is composed of a ceramic body, a first heat-conducting arm and a second heat-conducting arm; an insertion cavity for the temperature switch to be installed is formed on the rear end surface of the ceramic body; and when the live wire plug, the neutral wire plug, the ground wire plug and the ceramic heat-conducting component are rooted and fixed relative to the stabilizing frame, the first heat-conducting arm and the second heat-conducting arm respectively correspond to the live wire plug and the neutral wire plug and maintain a top-contact state.

3. The temperature control plug cable according to claim 2, characterized in that A strip-shaped through groove is formed on the front end surface of the ceramic body.

4. The temperature control plug cable according to claim 3, characterized in that The number of the strip-shaped through grooves is set to be multiple, and they are arranged in a linear array along the width direction of the ceramic body.

5. The temperature control plug cable according to any one of claims 1 to 4, characterized in that The temperature switch includes a temperature sensing control body and a first lead pin; the first lead pin is led out from the temperature sensing control body and is connected to the signal control line.

6. The temperature control plug cable according to claim 5, characterized in that The temperature switch also includes a second lead pin; the second lead pin is led out from the temperature sensing control body and is connected to the ground wire or the ground wire plug.

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