Junction box with leakage current limiting function

Abstract

The present invention relates to a junction box having a leakage current limiting function, in which a leakage current is limited by using an area difference between conductor electrodes respectively connecting end portions of single-phase three-wire input-side phase voltage lines (R lines), neutral lines (N lines), and ground lines (G lines) and output-side phase voltage lines (R lines), neutral lines (N lines), and ground lines (G lines), so that an electric shock accident can be more effectively prevented.

Description

Technical Field

[0001] This invention relates to a technique for limiting leakage current, and more specifically, to a terminal block having a leakage current limiting function. Background Technology

[0002] The applicant previously disclosed a technique in Korean Patent Registration No. 10-1625493 (May 24, 2016) in which leakage current decreases due to an increase in the area difference between two plate-shaped conductors. In this technique, leakage current is limited by using the area difference between conductor electrodes, thereby preventing electric shock.

[0003] Therefore, the inventors of this invention have developed a junction box with leakage current limiting function, in which leakage current is limited by the area difference between conductor electrodes, the two ends of which are connected to each of the phase voltage line (R line), neutral line (N line) and ground line (G line) on the input side of a single-phase three-wire circuit, and to each of the phase voltage line (R line), neutral line (N line) and ground line (G line) on the output side of a single-phase three-wire circuit, thereby preventing the risk of electric shock. Summary of the Invention

[0004] [Technical Issues]

[0005] The present invention aims to provide a junction box with leakage current limiting function, in which leakage current is limited by the area difference between conductor electrodes. The two ends of the conductor electrodes are connected to each of the phase voltage line (R line), neutral line (N line) and ground line (G line) on the input side of a single-phase three-wire circuit, and to each of the phase voltage line (R line), neutral line (N line) and ground line (G line) on the output side of a single-phase three-wire circuit, thereby preventing the risk of electric shock.

[0006] [Technical Solution]

[0007] According to an embodiment of the present invention, a junction box with leakage current limiting function includes an insulated junction box body, which includes an R conductor electrode, an N conductor electrode, and a G conductor electrode installed in the insulated junction box body. A phase voltage line (R line) at the input side and a phase voltage line (R line) at the output side of the single-phase three-wire circuit are connected to the two ends of the R conductor electrode. A neutral line (N line) at the input side and a neutral line (N line) at the output side of the single-phase three-wire circuit are connected to the two ends of the N conductor electrode. A grounding line (G line) at the input side and a grounding line (G line) at the output side of the single-phase three-wire circuit are connected to the two ends of the G conductor electrode. The junction box also includes an insulating housing coupled to the insulated junction box body to surround the upper and lower parts of the insulated junction box body. The junction box also includes a leakage current limiting unit that is electrically contacted with the N conductor electrode of the insulated junction box body and expands the area of ​​the N conductor electrode to limit leakage current.

[0008] The leakage current limiting unit may include a conductor area extension that is in electrical contact with the N conductor electrode and expands the area of ​​the N conductor electrode.

[0009] The leakage current limiting unit may also include a conductor inner shell that is in electrical contact with a conductor area extension member and further extends the area of ​​the N conductor electrode.

[0010] [Beneficial Effects]

[0011] In this invention, the area difference between conductor electrodes is used to limit leakage current. The two ends of the conductor electrodes are connected to each of the phase voltage line (R line), neutral line (N line), and ground line (G line) on the input side of a single-phase three-wire circuit, and to each of the phase voltage line (R line), neutral line (N line), and ground line (G line) on the output side of a single-phase three-wire circuit, thereby more effectively preventing electric shock accidents. Attached Figure Description

[0012] Figure 1 This is an external perspective view showing the configuration of a junction box with leakage current limiting function according to an embodiment of the present invention.

[0013] Figure 2 This is an exploded perspective view showing the configuration of a junction box with leakage current limiting function according to an embodiment of the present invention. Detailed Implementation

[0014] In the following description, exemplary embodiments of the invention will be described in more detail with reference to the accompanying drawings to enable those skilled in the art to readily understand and implement the invention. Although specific embodiments are shown in the drawings and detailed descriptions are provided, these embodiments are not intended to limit the embodiments of the invention to any particular form.

[0015] In the description of this invention, detailed descriptions of relevant well-known functions or configurations will be omitted when it is determined that such detailed descriptions unnecessarily obscure the spirit of the invention.

[0016] If a component is described as “connected” or “linked” to another component, it should be understood that the component can be directly connected to or linked to the corresponding component, or that other components may exist between them.

[0017] On the other hand, if a component is described as "directly connected" or "directly linked" to another component, it should be understood that there are no other components between them.

[0018] Figure 1 This is an external perspective view showing the configuration of a junction box with leakage current limiting function according to an embodiment of the present invention. Figure 2 This is an exploded perspective view showing the configuration of a junction box with leakage current limiting function according to an embodiment of the present invention.

[0019] As shown in the figure, the junction box 100 with leakage current limiting function according to this embodiment includes an insulated junction box body 110, an insulated outer shell 120 and a leakage current limiting unit 130.

[0020] The insulating junction box body 110 is made of insulating material. Multiple electrode receiving slots 111, formed by cutting from the upper part to the lower part of the insulating junction box body 110, are formed opposite to each other on the input side and the output side, and each electrode receiving slot 111 is electrically isolated by a partition wall 112.

[0021] Meanwhile, an R-conductor electrode 113a is disposed inside the insulating junction box body 110, and the two ends of the R-conductor electrode 113a are connected to the phase voltage line (R line) (not shown) on the input side of the single-phase three-wire circuit and the phase voltage line (R line) (not shown) on the output side of the single-phase three-wire circuit. For example, the R-conductor electrode 113a can be installed through a partition 112 formed between two electrode receiving slots 111 on one peripheral side of the insulating junction box body 110.

[0022] Furthermore, an N-conductor electrode 113b is disposed inside the insulating junction box body 110, and its two ends are connected to the neutral line (N-line) (not shown) on the input side of a single-phase three-wire circuit and the neutral line (N-line) (not shown) on the output side of a single-phase three-wire circuit. For example, the N-conductor electrode 113b can be mounted through a partition 112 formed between two central electrode receiving slots 111 in the insulating junction box body 110.

[0023] Furthermore, the G-conductor electrode 113c is disposed inside the insulating junction box body 110, and its two ends are connected to the grounding wire (G-line) (not shown) on the input side of the single-phase three-wire circuit and the grounding wire (G-line) (not shown) on the output side of the single-phase three-wire circuit. For example, the G-conductor electrode 113c can be mounted through a partition 112 formed between two electrode receiving slots 111 on another peripheral side of the insulating junction box body 110.

[0024] An insulating housing 120 is coupled to an insulating junction box body 110 to surround the upper and lower portions of the insulating junction box body 110. For example, the insulating housing 120 includes an insulating housing base body 121 and an insulating housing cover 122. The insulating housing base body 121 has a receiving groove 121a in which the insulating junction box body 110 is received. The insulating housing cover 122 is coupled to the upper portion of the insulating housing base body 121 by screws (not shown) while the insulating junction box body 110 is received in the receiving groove 121a.

[0025] In the accompanying drawings, reference numeral 121 indicates a through slot through which the phase voltage line (R line) at the input side and the phase voltage line (R line) at the output side of the single-phase three-wire, the neutral line (N line) at the input side and the neutral line (N line) at the output side of the single-phase three-wire, and the ground line (G line) at the input side and the ground line (G line) at the output side of the single-phase three-wire pass, reference numerals 121c and 122a indicate screw coupling slots to which screws are coupled, and reference numeral 114 indicates a screw through slot through which screws pass.

[0026] The leakage current limiting unit 130 makes electrical contact with the N conductor electrode 113b of the insulating junction box body 110 to expand the area of ​​the N conductor electrode 113b, thereby limiting the leakage current.

[0027] For example, the leakage current limiting unit 130 may include a conductor area extension 131 that is electrically contacted with the N conductor electrode 113b to expand the area of ​​the N conductor electrode. In this case, an opening 131a may be formed in the middle portion of the conductor area extension 131.

[0028] Through opening 131a, conductor area extension 131 is inserted into and coupled to partition 112 between two central electrode receiving slots 111 formed in the insulating junction box body 110. Thus, the lower part of conductor area extension 131 is electrically contacted with N conductor electrode 113b on both sides of the partition 112 between the two central electrode receiving slots 111, where conductor area extension 131 is installed across the partition 112 between the two central electrode receiving slots 111.

[0029] In this invention, through this implementation, because the conductor area extension member 131, the R conductor electrode 113a and the N conductor electrode 113b have different conductor areas, the leakage current is limited due to the area difference between the R conductor electrode 113a and the N conductor electrode 113b with different conductor areas.

[0030] In this case, due to the increasing difference in conductor area between the R conductor electrode 113a and the N conductor electrode 113b, the leakage current gradually decreases. Because the leakage current decreases, the risk of electric shock also decreases, thus providing a leakage current limiting function without the risk of electric shock.

[0031] This is because, as disclosed in Korean Patent Registration No. 10-1625493 (May 24, 2016) described in the related art, compared with the plate-shaped conductor connected to the positive terminal of the power supply (corresponding to the R conductor electrode of the present invention), the leakage current is reduced in the plate-shaped conductor connected to the negative terminal (corresponding to the N conductor electrode of the present invention) due to the increased area of ​​the plate-shaped conductor.

[0032] Therefore, in this invention, the area difference between conductor electrodes is used to limit leakage current. The two ends of the conductor electrodes are connected to the phase voltage line (R line), neutral line (N line), and ground line (G line) on the input side of a single-phase three-wire system, and to each of the phase voltage line (R line), neutral line (N line), and ground line (G line) on the output side of a single-phase three-wire system, thereby more effectively preventing electric shock accidents.

[0033] Meanwhile, according to another aspect of the invention, the leakage current limiting unit 130 may further include a conductor inner shell 132. This conductor inner shell 132 is in electrical contact with the conductor area extension member 131 to further expand the area of ​​the N-conductor electrode 113b.

[0034] For example, the conductor inner shell 132 includes a conductor inner shell base body 132a and a conductor inner shell cover 132b. The conductor inner shell base body 132a has a receiving groove 132a-1 in which the insulating junction box body 110 is received. The conductor inner shell cover 132b is coupled to the upper part of the conductor inner shell base body 132a by a screw (not shown) when the insulating junction box body 110 is received in the receiving groove 132a-1.

[0035] The lower part of the conductor area expansion member 131 is in electrical contact with the N conductor electrode 113b, and the upper part of the conductor area expansion member 131 is in electrical contact with the lower surface of the conductor inner shell cover 132b, so as to further expand the area of ​​the N conductor electrode 113b.

[0036] Furthermore, the conductor inner shell cap 132b is coupled to the upper part of the conductor inner shell base body 132a to further expand the area of ​​the N conductor electrode 113b. In the figures, reference numerals 132a-2 and 132b-1 indicate screw through slots through which screws for coupling the insulating shell base body 121 and the insulating shell cap 122 pass.

[0037] In this invention, the leakage current is limited by using the area difference between the conductor electrodes. The two ends of the conductor electrodes are connected to each of the phase voltage line (R line), neutral line (N line), and ground line (G line) on the input side of the single-phase three-wire system, and to each of the phase voltage line (R line), neutral line (N line), and ground line (G line) on the output side of the single-phase three-wire system, thereby more effectively preventing electric shock accidents.

[0038] The various embodiments disclosed in this specification and accompanying drawings are merely illustrative examples for a better understanding of the invention and are not intended to limit the scope of the various embodiments of the invention.

[0039] Therefore, the scope of the various embodiments of the present invention should be interpreted as including all changes and modifications derived from the technical ideas of the various embodiments of the present invention, in addition to the embodiments described herein.

[0040] [Industrial Applications]

[0041] This invention can be applied in the field of junction box technology and its application technology in industry.

Claims

1. A junction box with leakage current limiting function, comprising: An insulated junction box body includes an R conductor electrode, an N conductor electrode, and a G conductor electrode installed within the insulated junction box body. A phase voltage line (R line) at the input side and a phase voltage line (R line) at the output side of the single-phase three-wire circuit are connected to the two ends of the R conductor electrode. A neutral line (N line) at the input side and a neutral line (N line) at the output side of the single-phase three-wire circuit are connected to the two ends of the N conductor electrode. A grounding line (G line) at the input side and a grounding line (G line) at the output side of the single-phase three-wire circuit are connected to the two ends of the G conductor electrode. An insulating housing coupled to the insulating junction box body to surround the upper and lower portions of the insulating junction box body; and A leakage current limiting unit is included, which makes electrical contact with the N-conductor electrode of the insulated junction box body and expands the area of ​​the N-conductor electrode to limit leakage current. The leakage current limiting unit includes: A conductor area extender, the conductor area extender being in electrical contact with the N-conductor electrode and extending the area of ​​the N-conductor electrode; and A conductor inner shell, which is in electrical contact with the conductor area expansion member and further expands the area of ​​the N-conductor electrode, comprises a conductor inner shell base body and a conductor inner shell cover. The conductor inner shell base body has a receiving groove therein for accommodating the insulating junction box body. The conductor inner shell cover is coupled to the upper part of the conductor inner shell base body while the insulating junction box body is accommodated in the receiving groove. Specifically, the area of ​​the N conductor electrode is further expanded by electrically connecting the lower part of the conductor area expansion member to the N conductor electrode and electrically connecting the upper part of the conductor area expansion member to the lower surface of the conductor inner shell cover, and the area of ​​the N conductor electrode is further expanded by coupling the conductor inner shell cover to the upper part of the conductor inner shell base body.

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