Temperature control type national standard plug cord
By introducing a temperature control design that uses a thermistor and a current sensing resistor into the plug wire, the problem of burning of the three-core plug wire due to overheating is solved, thereby improving safety and reliability.
Patent Information
- Application Number
- CN202422442625.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2034-10-10
AI Technical Summary
Three-core plug cables generate severe heat in high-power supply situations, leading to unstable power supply and safety issues, and are prone to burning.
A temperature-controlled national standard plug cord was designed, equipped with a thermistor and a current sensing resistor. The temperature of the plug and socket was monitored by the temperature measurement component, and the current and voltage were adjusted using the power control box to avoid overheating.
It effectively prevents plugs, cords and sockets from being damaged by overheating, improves safety and lifespan, and ensures the reliability and safety of high-power electrical equipment.
Smart Images
Figure CN223348117U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of plug wire manufacturing, in particular to a temperature-controlled national standard plug wire. Background Art
[0002] Three-core plug cables are usually used in high-power power supply situations, such as refrigerators, washing machines, air conditioners, and new energy vehicle charging. Under continuous high-power power supply conditions, the three-core plug cable and the corresponding socket will heat up seriously, which will affect the stability and safety of the power supply. In addition, the plug cable, power cable core or socket will be burned from time to time. The reasons are as follows: 1) During the application 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-core plug cable and the socket is uneven or poor contact occurs from time to time, resulting in current overload. In addition, the heat dissipation of the plug cable and the socket does not meet the standard, which will cause the three-core plug cable, power cable core or socket to burn due to local overheating. 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 this temperature-controlled national standard plug cord.
[0004] In order to solve the above-mentioned technical problems, the utility model relates to a temperature-controlled national 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 an insulating plastic sheath and is isolated from the external environment. The cable core is bundled by three parallel live wires, neutral wires and ground wires. The three-pole plug includes a 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 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 first temperature measuring component and a second temperature measuring component. The first temperature measuring component is used to directly monitor the real-time temperature changes of the plastic insulator, and it includes a thermistor and a first wire. The thermistor is hidden in the plastic insulator, and it is electrically connected to the ground wire plug with the help of the first wire. The second temperature measurement component indirectly monitors the actual temperature of the outlet panel. It includes a current sensing resistor, a first conductive copper sleeve, a second wire, and a third wire. The first conductive copper sleeve is embedded in the plastic insulator, with its ends exposed. The two ends of the current sensing resistor are electrically connected to the first conductive copper sleeve and the grounding plug via the second and third wires, respectively.
[0005] As a further improvement to the technical solution disclosed in the present invention, the power supply system for supplying electric energy to the temperature-controlled national standard plug cord is equipped with a power control box. The first temperature measuring component also includes a first signal transmission line. The first signal transmission line is used to transmit the temperature parameter of the plastic insulator monitored by the thermistor to the power control box in real time, and the first signal transmission line is electrically conductive with the thermistor. The second temperature measuring component also includes a second signal transmission line. The second signal transmission line is used to transmit the temperature parameter of the socket panel monitored by the current sensing resistor to the power control box in real time, and the second signal transmission line is electrically conductive with the current sensing resistor. When either the temperature parameter of the plastic insulator or the temperature parameter of the socket panel reaches the temperature threshold, the power supply current of the cable core drops instantaneously under the intervention of the power control box.
[0006] As a further improvement to the technical solution disclosed in the present invention, a first insertion cavity is formed at the tail end of the thermistor. A second insertion cavity is formed at the tail end of the first conductive copper sleeve. A third insertion cavity is formed at the tail end of the ground wire insert. The first signal transmission line and the first conductor are clustered and inserted together in the first insertion cavity, and tightened with a compression neck. The second signal transmission line and the second conductor are clustered and inserted together in the second insertion cavity, and tightened with a compression neck. The ground wire, the first conductor, and the third conductor are clustered and inserted together in the third insertion cavity, and tightened with a compression neck.
[0007] As a further improvement to the technical solution disclosed in this utility model, the second temperature measurement assembly also includes a second conductive copper sleeve. This second conductive copper sleeve is a pseudo-frequency decoration, also embedded in the plastic insulator, with its end exposed. The first and second conductive copper sleeves are symmetrically positioned on either side of the grounding plug.
[0008] As a further improvement of the technical solution disclosed in the present utility model, the exposed lengths of the first conductive copper sleeve and the second conductive copper sleeve are consistent, both controlled to be 0.15 to 0.2 mm.
[0009] As a further improvement of the technical solution disclosed in this utility model, in a laboratory environment, the outer jacket withstand voltage test: AC3500 -0 +100 V / 1S; Inter-electrode withstand voltage test: AC2500 -0 +100 V / 1S; Insulation test: DC500V / 1S.
[0010] By adopting the above technical solution, the temperature-controlled national standard plug cord has two independent temperature measurement circuits: a first temperature measurement circuit and a second temperature measurement circuit. The first temperature measurement circuit mainly consists of a thermistor for directly measuring the real-time temperature of the plastic insulator, a first conductor for grounding the thermistor, and a first signal transmission line for transmitting temperature parameters to the power control box. The second temperature measurement circuit mainly consists of a current sensing resistor for indirectly measuring the real-time temperature of the socket panel, a first conductive copper sleeve that contacts the temperature-sensitive post of the socket panel, a second conductor for electrically connecting the current sensing resistor and the first conductive copper sleeve, a second signal transmission line for transmitting temperature parameters to the power control box, and a third conductor for grounding the current sensing resistor.
[0011] In practical applications, the temperature-controlled national standard plug cord disclosed in this utility model can achieve at least the following beneficial technical effects: the resistance of the thermistor is closely related to the ambient temperature, acting as a temperature sensor, capable of sensing real-time temperature changes in the plastic insulator. Simultaneously, as the temperature of the socket panel rises, the temperature-sensitive column embedded therein can generate an electrical signal that changes with temperature. The resistance of the current-sensing resistor changes with the current flowing through the temperature-sensitive column of the socket panel, enabling indirect sensing of real-time temperature changes in the socket panel. In actual applications, when either the actual measured temperature of the plastic insulator or the actual measured temperature of the socket panel exceeds a preset threshold, the thermistor or current sensing resistor instantly transmits a resistance signal to the power control box, adjusting the current and voltage supplied to the national standard plug cord, or even cutting off the power supply, which means an instantaneous drop in heating power, preventing the national standard plug cord or socket panel from burning due to excessive heat. This not only improves the safety of temperature-controlled national standard plug cords and socket panels and significantly increases their service life, but also ensures the reliability and safety of the charging operation process for large-function electrical appliances or electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] 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.
[0013] Figure 1 It is a structural schematic diagram of the first embodiment of the temperature-controlled national standard plug wire disclosed in the present utility model.
[0014] Figure 2 It is a three-dimensional schematic diagram of the first embodiment of the temperature-controlled national standard plug wire disclosed in the present utility model (with the plastic insulator and the insulating plastic sleeve hidden).
[0015] Figure 3 It is a front view of a three-pole plug in a first embodiment of the temperature-controlled national standard plug wire disclosed in the present utility model.
[0016] Figure 4 It is a three-dimensional schematic diagram of the second embodiment of the temperature-controlled national standard plug wire disclosed in the present utility model (with the plastic insulator and the insulating plastic sleeve hidden).
[0017] Figure 5 It is a front view of a three-pole plug in the second embodiment of the temperature-controlled national standard plug wire disclosed in the present utility model.
[0018] Figure 6 This is a physical picture of a charging socket that is compatible with a certain temperature-controlled national standard plug cord in the existing technology.
[0019] 1-Three-pole plug; 11-Plastic insulator; 12-Live wire plug; 13-Neutral wire plug; 14-Ground wire plug; 15-First temperature measurement component; 151-Thermistor; 152-First conductor; 153-First signal transmission line; 16-Second temperature measurement component; 161-Current sensing resistor; 162-First conductive copper sleeve; 163-Second conductor; 164-Third conductor; 165-Second signal transmission line; 166-Second conductive copper sleeve; 2-Cable; 21-Cable core; 211-Live wire; 212-Neutral wire; 213-Ground wire; 22-Insulating plastic sleeve. DETAILED DESCRIPTION
[0020] Three-core plug cables are typically used for high-power applications. For example, when charging new energy vehicles, they connect to the charging station's socket panel using a three-core plug cable. A power control box is also included to control the charging current and voltage. In fast-charging scenarios, the charging current can reach 150-400A, allowing the vehicle's battery to be fully charged in a short period of time.
[0021] The following is a further detailed description of the present invention in conjunction with specific embodiments. Figure 1 The schematic diagram of the first embodiment of the temperature-controlled national standard plug cord disclosed in this utility model shows that it is composed of a three-pole plug 1 connected to a cable 2. The cable 2 is composed of a cable core 21 and an insulating plastic sheath 22. The cable core 21 is encased in the insulating plastic sheath 22, isolating it from the external environment.
[0022] Combine Figure 1 、 2 As shown in FIG, the cable core 21 is formed by a bundle of three parallel live wires 211, neutral wire 212 and ground wire 213. Figure 2 、 3As shown in FIG, the three-pole plug 1 is mainly assembled from several parts, including a plastic insulator 11, a live wire blade 12, a neutral wire blade 13, and a ground wire blade 14. The live wire blade 12, the neutral wire blade 13, and the ground wire blade 14 are all rooted and fixed in the 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.
[0023] Depend on Figure 2 It can also be clearly seen from the figure that the three-pole plug 1 is equipped with a first temperature measuring component 15 and a second temperature measuring component 16. Among them, the first temperature measuring component 15 is used to directly monitor the real-time temperature changes of the plastic insulator, and the second temperature measuring component 16 is used to indirectly monitor the actual temperature changes of the socket panel, and the temperature measurement processes of the two are independent of each other. The first temperature measuring component 15 includes a thermistor 151 and a first wire 152. The thermistor 151 is hidden in the plastic insulator 11, and it is electrically connected to the ground wire plug 14 with the help of the first wire 152. The second temperature measuring component 16 includes a current sensing resistor 161, a first conductive copper sleeve 162, a second wire 163 and a third wire 164. The first conductive copper sleeve 162 is rooted in the plastic insulator 11, and the end is exposed to facilitate top contact and electrical conduction with the temperature-sensitive column of the socket panel. The two ends of the current sensing resistor 161 are electrically connected to the first conductive copper sleeve 162 and the grounding plug 14 via the second conductive wire 163 and the third conductive wire 164 .
[0024] The power supply system that supplies power to the temperature-controlled national standard plug line is equipped with a power control box (not shown in the figure). Furthermore, when the temperature value sensed by the thermistor 151 and the current sensing resistor 161 exceeds the preset threshold value, the temperature parameters can be immediately transmitted to the power control box. As a further optimization of the above technical solution, Figure 2 As shown in FIG, the first temperature measurement component 15 is further provided with a first signal transmission line 153. The first signal transmission line 153 is used to transmit the temperature parameter of the plastic insulator 11 monitored by the thermistor 151 to the power control box in real time, and is electrically conductive with the thermistor 151. The second temperature measurement component 16 is further provided with a second signal transmission line 165. The second signal transmission line 165 is used to transmit the temperature parameter of the socket panel monitored by the current sensing resistor 161 to the power control box in real time, and is electrically conductive with the current sensing resistor 161. When either the temperature parameter of the plastic insulator 11 or the temperature parameter of the socket panel reaches a temperature threshold, the power supply current of the cable core 21 is instantaneously reduced under the intervention of the power control box.
[0025] As can be seen from the above description, the newly developed temperature-controlled national standard plug cord has two independent temperature measurement circuits: a first temperature measurement circuit (the main body of which is the first temperature measurement component 15) and a second temperature measurement circuit (the main body of which is the second temperature measurement component 16). The first temperature measurement circuit mainly consists of a thermistor 151 for directly measuring the real-time temperature of the plastic insulator 11, a first wire 152 for grounding the thermistor 151, and a first signal transmission line 153 for transmitting temperature parameters to the power control box. The second temperature measurement circuit mainly consists of a current sensing resistor 161 for indirectly measuring the real-time temperature of the socket panel, a first conductive copper sleeve 162 that contacts the temperature-sensitive column of the socket panel, a second wire 163 for electrically connecting the current sensing resistor 161 and the first conductive copper sleeve 162, a third wire 164 for grounding the current sensing resistor 161, and a second signal transmission line 165 for transmitting temperature parameters to the power control box.
[0026] In practical applications, the temperature-controlled national standard plug wire disclosed by the present invention has achieved the following beneficial technical effects: the resistance of the thermistor 151 is closely related to the ambient temperature, which is equivalent to a temperature sensor. The thermistor 151 can sense the real-time temperature changes of the plastic insulator 11. At the same time, as the temperature of the socket panel increases, the temperature-sensitive column (such as Figure 6 ) can give an electrical signal change as the temperature changes. The resistance of the current sensing resistor 161 changes as the current of the temperature-sensitive column of the socket panel changes. The current sensing resistor 161 can indirectly sense the real-time temperature change of the socket panel. In actual applications, when the actual measured temperature of the plastic insulator 11 and the actual measured temperature of the socket panel exceed the preset threshold, the thermistor 151 or the current sensing resistor 161 immediately transmits the resistance signal to the power control box, adjusts the current and voltage of the national standard plug line, or even cuts off the power supply, which means an instantaneous drop in heating power, avoiding the occurrence of burning of the national standard plug line or the socket panel due to excessive heat. In this way, not only can the safety of the use of temperature-controlled national standard plug lines and socket panels be improved, and their service life be greatly improved, but also the reliability and safety of the charging operation process for large-function electrical appliances or electrical equipment can be guaranteed.
[0027] As is known, the live wire 211, the neutral wire 212, the ground wire 213, the first wire 152, the second wire 163 and the third wire 164 can adopt a variety of design structures to achieve electrical conduction. 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: Figure 2As shown in FIG, the tail end of the thermistor 151 is formed with a first insertion cavity. The tail end of the first conductive copper sleeve 162 is formed with a second insertion cavity. The tail end of the ground wire plug 14 is formed with a third insertion cavity. The first signal transmission line 153 and the first conductor 152 are clustered and inserted into the first insertion cavity together, and the compression neck is tightened. The second signal transmission line 165 and the second conductor 163 are clustered and inserted into the second insertion cavity together, and the compression neck is tightened. The ground wire 213, the first conductor 152, and the third conductor 164 are clustered and inserted into the third insertion cavity together, and the compression neck is tightened. In the process of preparing the temperature-controlled national standard plug wire, taking the electrical conduction method between the first conductive copper sleeve 162 and the second signal transmission line 165 and the second wire 163 as an example, the second signal transmission line 165 and the second wire 163 are firstly stripped to expose a sufficient length of each metal wire, and then the two are bundled to be inserted into the second plug-in cavity. Subsequently, a clamping force is applied to the circumferential side wall of the second plug-in cavity until the second plug-in cavity undergoes a "necking" deformation, and the second signal transmission line 165 and the second wire 163 are stably clamped, and the first conductive copper sleeve 162 achieves good electrical conduction with the second signal transmission line 165 and the second wire 163.
[0028] Without significantly increasing the difficulty and manufacturing cost of injection molding of the plastic insulator 11, in order to ensure that the first conductive copper sleeve 162 can achieve good top contact and electrical conductivity with the temperature-sensitive column of the socket panel, the exposed length of the first conductive copper sleeve 162 is consistent and controlled at 0.15~0.2mm.
[0029] Figure 4 The figure shows a perspective diagram of the second embodiment of the temperature-controlled national standard plug cable disclosed in the present invention. The difference between the second embodiment and the first embodiment is that the second temperature measuring component 16 has a second conductive copper sleeve 166. The second conductive copper sleeve 166 is a pseudo-frequency decoration. It is also rooted in the plastic insulator 11, and the end is exposed and maintains the same height as the first conductive copper sleeve 162. The first conductive copper sleeve 162 and the second conductive copper sleeve 166 are respectively arranged on both sides of the ground wire plug 213 and are symmetrical (as shown in FIG. Figure 5 ).
[0030] Finally, it should be noted that in order to ensure that the temperature-controlled national standard plug wire has good electrical performance after preparation and to ensure safe power supply in subsequent practical applications, it is necessary to conduct performance testing before formal packaging and storage. In a laboratory environment, the outer sheath withstand voltage test: AC3500 -0 +100 V / 1S; Inter-electrode withstand voltage test: AC2500 -0 +100 V / 1S; Insulation test: DC500V / 1S.
[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 temperature-controlled national standard plug cord, composed of 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 to be isolated from the external environment; the cable core is bundled by three parallel live wires, a neutral wire, and a ground wire; the three-pole plug includes a 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 plastic insulator, and their tail ends are electrically connected to the live wire, the neutral wire, and the ground wire respectively, one by one. Characterized in that: The three-pole plug further includes a first temperature measuring component and a second temperature measuring component; the first temperature measuring component is used to directly monitor the real-time temperature change of the plastic insulator, and includes a thermistor and a first wire; the thermistor is hidden in the plastic insulator and is electrically connected to the ground plug via the first wire; the second temperature measuring component is used to indirectly monitor the actual temperature change of the socket panel, and includes a current sensing resistor, a first conductive copper sleeve, a second wire, and a third wire; The first conductive copper sleeve is rooted in the plastic insulator, with an end portion exposed; The two ends of the current sensing resistor are electrically connected to the first conductive copper sleeve and the ground wire plug at the same time by means of the second wire and the third wire respectively.
2. The temperature-controlled national standard plug wire according to claim 1, characterized in that The power supply system that supplies electric energy to the temperature-controlled national standard plug line is equipped with a power control box; the first temperature measuring component also includes a first signal transmission line; the first signal transmission line is used to transmit the temperature parameter of the plastic insulator monitored by the thermistor to the power control box in real time, and it is electrically conductive with the thermistor; the second temperature measuring component also includes a second signal transmission line; the second signal transmission line is used to transmit the temperature parameter of the socket panel monitored by the current sensing resistor to the power control box in real time, and it is electrically conductive with the current sensing resistor; when any one of the temperature parameter of the plastic insulator and the temperature parameter of the socket panel reaches the temperature threshold, under the intervention of the power control box, the power supply current of the cable core drops instantaneously.
3. The temperature-controlled national standard plug wire according to claim 2, characterized in that The tail end of the thermistor is formed with a first insertion cavity; the tail end of the first conductive copper sleeve is formed with a second insertion cavity; the tail end of the ground wire plug is formed with a third insertion cavity; the first signal transmission line and the first conductor are clustered and inserted into the first insertion cavity together, and the compression neck is tightened; the second signal transmission line and the second conductor are clustered and inserted into the second insertion cavity together, and the compression neck is tightened; the ground wire, the first conductor and the third conductor are clustered and inserted into the third insertion cavity together, and the compression neck is tightened.
4. The temperature-controlled national standard plug cord according to any one of claims 1 to 3, characterized in that The second temperature measuring component also includes a second conductive copper sleeve; the second conductive copper sleeve is a false frequency decoration, which is also rooted in the plastic insulator and the end is exposed; the first conductive copper sleeve and the second conductive copper sleeve are respectively arranged on both sides of the ground wire plug and are symmetrical.
5. The temperature-controlled national standard plug wire according to claim 4, characterized in that The exposed lengths of the first conductive copper sleeve and the second conductive copper sleeve are consistent, both controlled at 0.15 to 0.2 mm.
6. The temperature-controlled national standard plug cord according to any one of claims 1 to 3, characterized in that ,In laboratory environment, outer jacket withstand voltage test: AC3500 -0 +100 V / 1S; Inter-electrode withstand voltage test: AC2500 -0 +100 V / 1S; Insulation test: DC500V / 1S.