KR102150943B1 - Temperature-sensitive safety plug with sensor box - Google Patents

Abstract

The present invention relates to a plug for supplying power to a high-capacity electric device such as an electric vehicle and an electric device. Specifically, provided is a safety plug with a temperature sensor embedded in a plug body, wherein the temperature sensor is inserted into a separate sensor box to be embedded, and the sensor box is also inserted and fixed by using a ground terminal body embedded with a terminal support in the plug body. Since the temperature sensor assembled by using the sensor box is protected from external physical force during assembly and injection molding of the safety plug, the safety plug having a temperature sensor at a constant position at all times can be molded. By minimizing the defect rate, the quality stability of the safety plug is very excellent and high-quality safety plugs can be produced in large quantities, thereby the safety plug being very economical. As for the assembly process of the temperature sensor, it is sufficient to simply insert the sensor box into the ground terminal to be fixed, and so the assembly productivity is also greatly improved, which is very efficient.

Description

Temperature-sensitive safety plug with sensor box {Temperature-sensitive safety plug with sensor box}

The present invention relates to a plug for supplying power to high-capacity electric devices and electric devices such as an electric vehicle, and more particularly, a temperature sensor embedded in the plug body is built into a separate sensor box, and the sensor box is The present invention relates to a temperature-sensing safety plug that prevents the temperature sensor from flowing during the insert injection molding process of the plug body by configuring it to be easily coupled and fixed using a pot holder and a ground terminal body in the plug body.

In general, a plug-in power plug is a connection device for supplying power from an outlet to which power is applied to various electric devices and electrical devices, and is used to supply power to home appliances used in general homes or industrial devices used in industrial sites. It is essentially used as a connector.

The plugged power plug is connected to the end of the cord connected to various electric devices and devices. When the above plug having a structure corresponding to the outlet of the outlet is inserted into an outlet to which power is applied, the power of the outlet is turned off. It can be supplied to the above electric devices and devices through plugs and cords.

In addition, in recent years, various electric devices and electric devices using electricity, which are eco-friendly energy, are widely used, and representatively, electric vehicles are applicable. In the case of the above electric vehicles, a vehicle battery using a separate electric charging station is used. The pack is quickly charged or the battery pack is charged at a low speed by using a household power source.

In particular, the electric vehicle industry based on electric energy as described above is developing day by day, and such electric vehicles commonly use electric energy to drive vehicles, especially PHEV (Plug-in Hybrid EV) and EV (Electric Vehicle) A vehicle is to be supplied with power from the outside, and a vehicle that receives power from the outside has a battery pack inside the vehicle and can charge the battery pack through an external charger. Similar to charging by connecting the battery, the battery pack in the vehicle can be charged by connecting the power plug to the power outlet provided in the external charger.

Here, high-capacity electric devices and electric devices such as the electric vehicle are provided with a plug for supplying power such as charging a battery, and in the case of the plug, the plug has a sufficient standard to continuously and stably supply high-capacity power. It consists of a cable and a plug body formed at the end of the cable.

In particular, in recent years, the required power of various electric devices and electric devices has become more high-capacity, and in the case of electric vehicles, plugs are used to supply more high-capacity power to meet the demand for an increase in charging quantity and an increase in charging speed. In this case, a control means (controller) for controlling the power provided through the plug should be provided.

In other words, in the case of a high-capacity plug, if continuous overload (rated load) occurs, high heat occurs in the plug, outlet, and power cord due to overcurrent (rated maximum current) occurring at the connection between the plug and the outlet, or the connection between the outlet and the plug. Alternatively, high heat may occur due to arcing caused by foreign substances in the connection part. If such a high-temperature heating effect continues or the temperature rises, there is a risk of fire at the plug and outlet, and serious damage to property and human life is caused by such an unexpected fire.

Accordingly, in recent years, in order to prevent fire due to high heat at the plug connector, structural improvements have been implemented for the plug body, and when high temperature heat is detected, power supply through the plug is temporarily cut off through a separate control means. By configuring so that it is possible to prevent unexpected fire due to overload, a safety plug is being used.

In other words, as in Utility Model Registration No. 20-0176766, an intermittent switch is installed inside the plug so that it is connected only when the plug is correctly inserted to prevent electric shock. In the electric vehicle charging tool comprising a, the contact of the terminal placed inside the plug and the wire are separated from each other, the terminal is installed to be able to contact/interrupt the contact by sliding in a longitudinal direction inside the plug, and the Safety plugs for charging electric vehicles with an elastic spring interposed between terminals and contacts have been devised and registered.

Then, as in Utility Model Registration No. 20-0290997, in the power plug connected to the other side of the cord connected to the electric appliance and connected to a plurality of connection pins configured to be inserted into an outlet, when the cord is overheated inside the plug It is a temperature sensor that is installed close to the cord to provide a power plug provided with a power cutoff device that cuts off the power supply and transmits the temperature signal of the cord to the control unit of the electric appliance so that the power can be cut off when the temperature of the cord is above a certain temperature. A power plug made of bimetal that is made or connected to a cord and cuts off power by shorting a cord line when the cord is above a certain temperature has been devised and registered.

In addition, a plug portion including a plurality of circular plug pins configured to be inserted into a power outlet, as in Korean Patent Application Publication No. 10-2017-0087121, a sensor disposed adjacent to the plug portion and detecting heat of the plug portion, and the plug portion A housing that supports the sensor from the inside, and one end enters into the housing, holds an electric wire connected to the plug portion therein, and includes a cable having a part of the outer circumferential surface fixed to the housing, The housing is characterized in that the sensor insertion hole is integrally formed in the inner body, and the sensor is interposed in the sensor insertion hole of the housing so as to be positioned between the plug pins, and specifically, the sensor generates heat in the plug. A temperature sensor and a power plug for electric vehicles with built-in US-type terminals have been devised respectively.

In addition, a plug portion including a plurality of circular plug pins configured to be inserted into a power outlet as in Korean Patent Application Publication No. 10-2017-0093269, a sensor disposed adjacent to the plug portion, and sensing heat of the plug portion, and the plug portion A housing that supports the sensor from the inside, and one end enters into the housing, holds an electric wire connected to the plug portion therein, and includes a cable having a part of the outer circumferential surface fixed to the housing, The housing is characterized in that the sensor insertion hole is integrally formed in the inner body, and the sensor is interposed in the sensor insertion hole of the housing so as to be positioned between the plug pins, and specifically, the sensor generates heat in the plug. A temperature sensor and a power plug for an electric vehicle with a built-in European terminal have been devised, respectively, that can detect and cut off the current flowing through the plug when it exceeds a certain temperature.

However, in the case of the above-described temperature-sensing safety plug, the embedded temperature-sensing sensor flows due to injection pressure during the insert injection molding process of the plug body, significantly lowering the quality stability, preventing mass production of high-quality safety plugs. Has.

In other words, in the case of the existing temperature-sensing safety plug, in a state in which the ground terminal body is connected using a terminal support and a temperature sensor is inserted into the terminal support, the power line of the cable and the ground terminal body are connected to the terminal support and the ground terminal body. The ground wire and the sensing wire are connected respectively, and after inserting them into the injection mold, the plug body is injection-molded through the insert molding method.

At this time, since the temperature sensor is inserted entirely by hand by the operator, the temperature sensor cannot be inserted at a certain position, as well as the high temperature and high pressure melt resin flows the temperature sensor during the injection molding process. Eventually, the temperature monitoring sensor has to be molded differently for each completed safety plug.

Therefore, in some cases, the temperature sensing sensor is molded in a state that is excessively exposed to the outer surface of the plug body, or in some cases, it is molded deep inside the plug body, so the temperature sensing speed and reaction force are different, and in some cases, the overheating condition. It has a problem such as not being able to detect or shutting off power due to unnecessarily fast detection.All of these defective products are shipped with the temperature sensor completely embedded in the plug body, so it is not possible to accurately inspect the defective state. There is one problem, and in such a case, fire due to overheating cannot be prevented in advance.

Korea registered utility model 20-0176766 (2000.01.19. registered) Korea Registered Utility Model 20-0290997 (Registered on September 19, 2002) Korean Patent Publication 10-2017-0087121 (published on July 28, 2017) Republic of Korea Patent Publication 10-2017-0093269 (published on August 16, 2017)

The present invention is to improve the problem as described above, in the safety plug in which the temperature sensor is embedded in the plug body, the temperature sensor is inserted into a separate sensor box to be embedded, and the sensor box is also the plug body It is configured to be inserted and fixed using a ground terminal body embedded with the terminal support.

The temperature sensing sensor, which is protected from the outside by the sensor box, can maintain a stable state without any flow during the assembly process as well as during the molding process of the plug body.Therefore, a sensor box equipped with a characteristic sensor box capable of mass production of high-quality safety plugs is provided. It is an object of the present invention to provide a knowledge safety plug.

The present invention for achieving the above object, a pair of plug pins are vertically coupled, support posts are protruding on both sides of the upper surface, and a terminal support having a socket receiving groove and a terminal receiving groove respectively formed on the bottom surface; A ground terminal body having a ground socket portion and a ground terminal portion bent, respectively, and vertically formed bent support portions closely coupled to the support posts on both sides; A temperature sensing sensor and a lead wire of the temperature sensing sensor positioned inside the terminal receiving groove of the terminal support; A cable consisting of a power line, a ground line, and a sensing line respectively connected to the plug pin, the ground terminal part, and the lead wire; In the temperature sensing safety plug comprising the terminal support and the ground terminal body, the temperature sensing sensor, and a plug body that is insert injection molded so that a part of the cable is embedded,

The temperature sensor is inserted into a separate sensor box, the sensor box into which the temperature sensor is inserted is inserted and fixed into the terminal receiving groove of the terminal support, and the lead wire of the temperature sensor is drawn out to the upper portion of the terminal receiving groove. It is configured to be connected to the sensing line of the cable.

In the present invention, since the temperature sensing sensor assembled using the sensor box is protected from no physical force from outside during the assembly process and injection molding process of the safety plug, a safety plug having a temperature sensing sensor at a constant position can be molded at all times. It is not only excellent in quality stability, but also very economical as it can produce high-quality safety plugs in large quantities by minimizing the defect rate. The assembly process of the temperature sensor is also sufficient to simply insert the sensor box into the ground terminal and fix it. Productivity is also greatly improved, which is very efficient.

1 is an overall configuration diagram of a safety plug according to the present invention
Figure 2 is an enlarged perspective view of the main part of the safety plug according to the present invention
3 is an enlarged cross-sectional view of the main part of the safety plug according to the present invention
Figure 4 is an exploded perspective view of the sensor box of the safety plug according to the present invention
5 is an overall side cross-sectional view of the sensor box of the safety plug according to the present invention
6 is an assembly process diagram of the terminal support of the safety plug according to the present invention
Figure 7 is a complete assembly of the terminal support of the safety plug according to the present invention
Figure 8 is a state diagram of the cable connection to the terminal support of the safety plug according to the present invention

Additional objects, features, and advantages of the present invention may be more clearly understood from the following detailed description and accompanying drawings.

Prior to the detailed description of the present invention, the present invention can be made various modifications and various embodiments, and the examples described below and shown in the drawings are intended to limit the present invention to specific embodiments. It should be understood as including all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

In addition, when a component is referred to as being "connected" or "connected" to another component, it may be directly connected or connected to the other component, but other components may exist in the middle. It should be understood that there is. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

Subsequently, the terms used in the present specification are used only to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

In addition, terms such as "... unit", "... unit", and "... module" described in the specification mean a unit that processes at least one function or operation, which is hardware, software, or hardware and It can be implemented as a combination of software.

In addition, in the description with reference to the accompanying drawings, the same reference numerals are assigned to the same components regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an overall configuration diagram of a safety plug according to the present invention, FIG. 2 is an enlarged perspective view of a main part of the safety plug according to the present invention, and FIG. 3 is an enlarged cross-sectional view showing a main part of the safety plug according to the present invention. An exploded perspective view of the sensor box of the safety plug according to the present invention, FIG. 5 is a cross-sectional side view of the safety plug according to the present invention.

As shown in the figure, the safety plug according to the present invention is intended to improve the problem of the safety plug in which the existing temperature sensing sensor is embedded. In the present invention, a separate sensor box for accommodating the temperature sensing sensor is provided, and the sensor box Improvements have been made to the mutual assembly to be easily and securely assembled and fixed.

Here, the safety plug is composed of a terminal support 10, a ground terminal body 20, a temperature sensor 30, a cable 40, and a plug body 50 by insert injection molding, and the terminal support ( 10) is injection-molded using heat-resistant insulating material, but a pair of plug pins 11 and 11 ′ are vertically coupled on both sides, and vertical support posts 12 and 12 are vertically coupled to both sides of the upper terminal support 10. ') is formed, and a socket receiving groove 13 and a terminal receiving groove 14 are formed in succession on the bottom surface of the terminal support 10, respectively.

At this time, the plug pins 11 and 11 ′ correspond to a power connection pin for coupling to a socket to which power is applied, and the terminal support 10 and the support posts 12 and 12 ′ correspond to the entire plug. At the same time, it serves as an internal skeleton of the terminal and at the same time serves to closely fix the ground terminal body 20 provided separately, and the socket receiving groove 13 allows the ground socket to be inserted into the inner side and the terminal receiving groove 14 Is to insert a ground terminal to which a separate ground wire is connected.

Subsequently, the ground terminal body 20 that is closely fixed to the terminal support 10 is made by bending a metal plate material having excellent conductivity, and is in close contact with the bottom surface of the terminal support 10 and at the same time, each of the socket receiving grooves ( The ground socket portion 21 inserted into 13) and the ground terminal portion 22 inserted into the terminal receiving groove 14 to protrude upward from the terminal support 10 are bent.

In addition, vertical bent support portions 23 and 23 ′ are formed on both sides of the ground terminal body 20 so that the support posts 12 and 12 ′ of the terminal support 10 are bent support portions 23 ( 23') are coupled to each other in close contact, and engaging protrusions (not shown in the drawing) are formed at each end of the support posts 12, 12', and corresponding bending support portions 23, 23' By forming a locking hole (omitted in the drawing) at each tip of, the ground terminal body 20 can be securely and easily fixed in close contact with the terminal support 10 by mutual locking.

In particular, the ground terminal part 22 is formed on the upward bent part 24 formed by bending the ground terminal body 20 upward in a "c" shape, and the ground terminal part 22 is a terminal support ( It is inserted through the terminal receiving groove 14 of 10) and protrudes upward of the ground terminal part 11, and the upwardly bent part 24 remains inserted into the terminal receiving groove 14. .

In addition, fastening holes 25 and 25 ′ penetrated in the transverse direction are formed at both sides of the upwardly bent part 24, and the fastening holes 25 and 25 ′ are separately provided in a sensor box. (60) will play a role in efficiently coupling and fixing.

Subsequently, a pair of lead wires 31 and 31 ′ are formed in the temperature sensor 30 inserted into the sensor box 60, and the temperature sensing state by the temperature sensor 30 is determined by the lead wire. It can be transmitted through (31) (31'), and the lead wires (31, 31') are connected to a separate controller, etc., so that the temperature value provided through the lead wires (31, 31') The controller is in charge of controlling the power supply. When overheating is detected by the temperature sensor 30, the controller uses the information provided through the lead wires 31 and 31 ′. It is possible to prevent a fire in the safety plug by immediately shutting off the power provided.

In addition, the safety plug in the present invention is composed of a cable 40 connected to the terminal support 10, the ground terminal body 20, and the temperature sensor 30, respectively, the cable 40 It is composed of a pair of power lines 41 and 41 ′, a single stranded ground line 42 and a pair of sensing lines 43 and 43 ′, and the power lines 41 and 41 ′ are It is connected to the plug pins 11 and 11 ′ of the terminal support 10 and connected to an outlet.

Then, the ground wire 42 is connected to the ground terminal portion 22 of the ground terminal body 20, and the grounding state for various electric devices and electric devices through the ground socket portion 21 exposed to the outside of the safety plug. The sensing wires 43 and 43 ′ are connected to the respective lead wires 31 and 31 ′ of the temperature sensing sensor 30, and these sensing lines 43 and 43 ′ are Is connected to a separate controller, so the controller regulates the power supplied to various electric devices and electric devices through the temperature sensor 30, the lead wires 31, 31', and the sensing wires 43, 43'. Will do.

In particular, the sensor box 60 into which the temperature sensor 30 is inserted is injection-molded using synthetic resin made of an insulator, and has an open top, and the upper part of the open sensor box 60 As the separate cover 62 is coupled, the inside of the sensor box 60 is sealed.

In addition, the cover 62 has a vertically penetrating withdrawal hole 61 formed therein, and the lead wires 31 and 31 ′ of the temperature sensor 30 located inside the sensor box 60 are the withdrawal holes ( 61) is exposed to the upper side of the cover 62 and can be connected to the sensing lines 43 and 43' of the electric cable 40.

Subsequently, the upper surface of the sensor box 60 has fitting pins 63 and 63' protruding in all directions, and the corresponding cover 62 has vertically penetrating fitting holes 64 and 64'. After inserting the temperature sensor 30 into the sensor box 60, inserting the cover 62 while pulling out the lead wires 31 and 31 ′ to the outside through the withdrawal hole 61 When the fitting pins 63 and 63 ′ of the sensor box 60 are joined by force insertion with the balls 64 and 64 ′, the inside of the sensor box 60 is sealed and the cover 62 and It will remain firmly assembled.

In addition, semicircular protrusions 65 and 65 ′ that face each other are protruding from the upper side of both sides of the sensor box 60 and the lower side of both sides of the cover 62, respectively, with respect to the sensor box 60 62), these semi-circular protrusions 65 and 65 ′ form a circular protrusion while the end faces of these semi-circular protrusions are in close contact with each other, and the circular protrusions by the semi-circular protrusions 65 and 65 ′ in contact with each other are electricity. It corresponds to the fastening holes 25 and 25 ′ formed in the upwardly bent part 24 of one grounding terminal body 20, and the sensor box 60 into the inside of the upwardly bent part 24 of the earthing terminal body 20. ), the semicircular protrusions 65 and 65 ′ of the sensor box 60 are inserted into the fastening holes 25 and 25 ′, thereby creating a mutually rigid assembly and fixing state.

Accordingly, as shown in FIG. 6, the ground terminal body 20 is pushed up from the lower side of the terminal support 10 so that the bent support portions 23 and 23 ′ of the ground terminal body 20 are supported by the support body 10. At the same time, the ground socket portion 21 and the ground terminal portion 22 of the ground terminal body 20 are coupled to the posts 12 and 12', respectively, the socket receiving groove 13 and the terminal receiving groove of the terminal support 10. 14), and in this state, the sensor box 60 having the temperature sensor 30 can be pushed into the terminal receiving groove 14.

That is, the lead wires 31 and 31 ′ of the temperature sensing sensor 30 pass through the terminal receiving groove 14 and are drawn out to the upper side of the terminal support 10 to accommodate the terminal. When pushed into the groove 14, the sensor box 60 and the cover 62 are inserted into the upward bent portion 24 of the ground terminal body 20 in the terminal receiving groove 14, and these sensor boxes 60 And the semi-circular protrusions 65 and 65' of the cover 62 are forcibly inserted into the fastening holes 25 and 25' on both sides of the upward bent portion 24 to achieve a solid assembly state between them.

In addition, the sensor box 60 is completely recessed into the inner side of the terminal receiving groove 14 of the terminal support 10 and does not interfere with the molding conditions of the entire plug at all.

In this state, the plug pins 11 and 11' of the terminal support 10, the ground terminal 22 of the grounding terminal body 20, and the lead wires 31 and 31' of the temperature sensor 30 are respectively The power line 41, 41', the ground line 42, and the sensing line 43, 43' of the cable 40 can be connected to each other by soldering or the like, and in this assembled state, they are placed in the plug molding mold. After the plug body 50 is molded through the insert injection molding method, the safety plug of the present invention is completed.

Therefore, the safety plug of the present invention is embedded in the plug in a state in which the temperature sensor 30 capable of detecting overheating of the plug is inserted into the sensor box 60 which is firmly fixed. It is possible to maintain stable quality by maintaining a constant purchase position, as well as to produce high-quality safety plugs in large quantities without defects.

The configurations shown in the embodiments and drawings as described above are only the most preferred embodiment of the present invention, and do not represent all the technical spirit of the present invention, so various equivalents and modifications that can replace them It should be understood that there may be examples.

10: terminal support 11,11': plug pin
12,12': support post 13: socket receiving groove
14: terminal receiving groove
20: ground terminal body 21: ground socket part
22: ground terminal 23,23': bending support
24: upward bend 25,25': fastening hole
30: temperature sensor 31,31': lead wire
40: cable 41,41': power line
42: ground wire 43,43': sensing wire
50: plug body
60: sensor box 61: withdrawal hole
62: cover 63,63': insertion pin
64,64': fitting hole 65,65': semi-circular projection

Claims (3)

A pair of plug pins (11) (11') are vertically coupled, and support posts (12) (12') are protruded on both sides of the upper side, and socket receiving grooves (13) and terminal receiving grooves (14) are formed respectively A terminal support 10; The ground socket part 21 and the ground terminal part 22 are each bent, and on both sides, a bent support part 23 and 23 ′ that are closely coupled to the support posts 12 and 12 ′ are vertically formed. )Wow; The lead wires 31 and 31 ′ of the temperature sensing sensor 30 and the temperature sensing sensor 30 located inside the terminal receiving groove 14 of the terminal support 10; Power lines 41, 41', ground lines 42, and sensing lines 43, respectively connected to the plug pins 11 and 11', the ground terminal 22, and the lead lines 31 and 31' A cable 40 consisting of 43'); The terminal support 10, the ground terminal body 20, and a part of the cable 40 are insert injection-molded so that a part of the cable 40 is embedded, and the temperature sensor 30 is a plug body that is inserted into a separate sensor box 60 In the temperature sensing type safety plug consisting of (50),
The sensor box 60 into which the temperature sensing sensor 30 is inserted is inserted and fixed into the terminal receiving groove 14 of the terminal support 10, and the sensor box 60 is coupled and fixed to the ground terminal body 20. But,
In the grounding terminal body 20 located in the terminal receiving groove 14 of the terminal support 10, an upward bent portion 24 for accommodating the sensor box 60 is formed, and both sides of the upward bent portion 24 The fastening holes 25 and 25 ′ are formed to pass through, and the sensor box 60 is configured such that the upper part of the sensor box 60 is opened and the cover 62 having a through-out hole 61 formed therein is coupled to the sensor box. Opposing semi-circular protrusions 65 and 65 ′ are formed on both upper portions of the box 60 and the lower portions of the cover 62, respectively, and when the sensor box 60 and the cover 62 are combined, these semi-circular protrusions 65 A circular protrusion is formed by the close contact of (65'), and the circular protrusions 65 and 65' are formed into fastening holes 25 and 25 ′ formed on both sides of the upward bent part 24. Temperature sensing type provided with a sensor box, characterized in that the sensor box 60 and the cover 62 are fixed in a close contact state within the upward bent portion 24 of the ground terminal body 20 while the protrusion is inserted and fixed. Safety plug. delete delete

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