JP5689097B2 - Terminal block - Google Patents

Description

  The present invention relates to a terminal block for connecting (connecting) a plurality of terminals.

Conventionally, terminals having various structures are known as terminal blocks used for connection (connection), branching, and relaying of electric wires (see, for example, Patent Documents 1 to 5).
However, conventionally, in a power transmission / reception route such as an event venue, as a terminal block for connecting (connecting) a power supply side cable terminal and a plurality of load side cable terminals, an insulating board made of bakelite is used as a base. A device that uses terminals and transmits power to each exhibition hall is generally used.

JP 2000-123891 A JP 2000-341806 A JP 2006-196407 A JP 2009-212025 A JP 2010-22080 A

A terminal block configured to use four terminals based on a conventional bakelite is composed of three phases of R, S, and T, which constitute one set and have the same structure. As shown in FIGS. 4 and 5, each phase terminal block has an electrode plate 4 arranged in parallel on the back side of an insulating board 2 made of bakelite. Four bolts 6, 8, 10, 12 are vertically disposed through the electrode plate 4 and the insulating board 2, and nuts 14, 16, 18 screwed into the bolts 6, 8, 10, 12. , 20, 22, 24, 26, and 28, the bolts 6, 8, 10, and 12 are fixed to the insulating board 2. The electrode plate 4 is interposed between the heads 6a, 8a, 10a, 12a of the bolts 6, 8, 10, 12 and the nuts 16, 20, 24, 28 constituting a pair with the heads 6a, 8a, 10a, 12a via spring washers or washers. It is fixed to the bolts 6, 8, 10, and 12.
Nuts 15, 19, 23, and 27 are screwed onto the bolts 6, 8, 10, and 12, washers 30 and 32 are disposed above the nut 15, and washers 36 and 38 are disposed above the nuts 19, 23, and 27. Are arranged respectively.

The terminal of the power supply side electric wire (cable) is inserted and arranged in the bolt 6 so as to be sandwiched between the washers 30 and 32, and is fixed between the washers 30 and 32 by the tightening force of the nut 34. On the other hand, the load-side electric wire terminal is inserted into the bolt so as to be sandwiched between the washers 36 and 38 disposed on the selected load-side bolt, and is fixed between the washers 36 and 38 by the tightening force of the nut 37. . The electric power supplied from the power supply side electric wire is supplied to the electrode plate 4 through a bolt 6 and a washer. On the other hand, power on the power source side is supplied to the electric wire on the load side through the electrode plate 4, bolts and washers 36 and 38, and terminals.

  In power transmission to each exhibition hall, such as an event venue, using the conventional terminal board with the combined structure of the insulating board 2 and the electrode plate 4, traces of burnout that were considered to be poor contact were found on the terminal board. There is. In order to investigate the cause, the applicant conducted a test of the terminal block having the above-described conventional configuration. As shown in the test results of FIGS. 6 and 7, the conventional terminal block has a predetermined level under a predetermined condition. It was confirmed that the above exothermic phenomenon occurred.

This is because energization is performed through the screw thread of the bolt and the screw thread of the nut that is screwed to the screw thread, which increases the contact resistance, which is considered to cause heat generation, and in some cases burns out. There was a case.
In the figure, R terminal, S terminal, and T terminal indicate terminal blocks of R phase, S phase, and T phase, and M16, M12A, 12B, and M12 indicate terminal coupling portions.

In the conventional terminal block shown in FIG. 4, when the nuts 34 and 37 are tightened to fix the terminals between the washers 30 and 32 and 36 and 38, the rotational force of the nuts 34 and 37 becomes the bolts 6 and 8. , 10, 12 and the bolts 6, 8, 10, 12 may idle. When the bolt is idle, a carbonization phenomenon occurs due to rubbing on the contact surface between the electrode plate and the member interlocking with the bolt, thereby causing a contact failure, which also causes heat generation. Further, when the bolt is idle, the electrode plate is loosely fixed, which also causes contact failure and increases contact resistance.
The present invention aims to solve the above problems.

In order to achieve the above object, the present invention provides a terminal comprising a terminal receiving surface and a screw projecting from the terminal receiving surface on one side of the wide side of the insulating board (40) supported by the frame (72). A terminal block provided with a plurality of coupling portions, wherein an electrode plate (68) is arranged on one surface on the wide side of the insulating board (40), and the screws are connected to the insulating board (40) and the electrode plate ( 68), and the end of each screw is locked to the other surface of the insulating board (40), and the terminal receiving electrode nut (50) has flat surfaces at both ends in the axial direction. (52) (54) (56) are screwed into the respective screws, and one flat surface of each terminal receiving electrode nut (50) (52) (54) (56) is flattened on the electrode plate (68). The other surface of each terminal receiving electrode nut (50) (52) (54) (56) The terminal receiving surface is a flat surface, and the terminal block is provided with an anti-rotation mechanism for preventing rotation of the screws (42) (44) (46) (48) with respect to the insulating board (40). The fitting portion of the terminal of the electric wire is inserted into the screw protruding from the screw, and the nut (58) (60) (62) (64) is screwed onto the screw from above the terminal, and the flat surface of the terminal Is brought into surface contact with the terminal receiving surface so as to be fixed by crimping.
Moreover, this invention comprises the said screw with a volt | bolt (42) (44) (46) (48).
Further, according to the present invention, the anti-rotation mechanism has a back plate (66) disposed on the other surface of the insulating board (40), and ends of the bolts (42) (44) (46) (48). The back plate (66) is fixed by welding.
In the present invention, an electrode protective insulating plate (70) is detachably disposed on the electrode plate (68).

In the present invention, since the contact between the terminal on the power source side and the electrode nut and between the electrode nut and the electrode plate are in surface contact, the energization performance can be improved, and burning due to heat generation can be prevented.
In addition, since the electrode plate is arranged on the terminal coupling portion installation surface side of the insulating board, the operator can easily check surface contact on the electrode plate and check for looseness. In addition, there are effects that the surface contact portion can be easily tightened and safety confirmation can be easily performed.

It is sectional drawing of the terminal block which concerns on this invention. It is a top view of a terminal block. It is an external view of an electrode nut. It is sectional drawing of a prior art. It is sectional drawing of a prior art. It is explanatory drawing of the temperature rise test result of a terminal block. It is explanatory drawing of the temperature rise test result of a terminal block. It is explanatory drawing of the temperature rise test result of a terminal block. It is explanatory drawing of the temperature rise test result of a terminal block. It is explanatory drawing of the temperature rise test result of a terminal block.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 shows a cross-sectional view of a terminal block 39 according to the present invention. The terminal block 39 is prepared in three phases, and FIG. 1 shows one phase (R phase) terminal block 39 among the three phases. The terminal block 39 includes an insulating board 40, screws including four bolts 42, 44, 46, and 48 attached thereto, and terminal receiving electrode nuts 50 that are screwed into the respective bolts 42, 44, 46, and 48. 52, 54, 56, terminal mounting nuts 58, 60, 62, 64 that screw into these bolts 42, 44, 46, 48, a back plate 66, an electrode plate 68, and an electrode protection insulating plate 70. I have.

Each phase of the terminal block 39 has the same configuration and is configured independently of each other, and is named R phase, S phase (or N phase), and T phase, respectively. The terminal blocks 39 for each phase are arranged in parallel with each other on the support plane of the frame 72 of the terminal box (not shown), and each terminal block 39 is fixed to the support portion of the frame 72. In this embodiment, the three-phase terminal block supported by the frame 72 constitutes one set. The insulating board 40 is made of a substantially rectangular parallelepiped elongated plate-like FRP (fiber reinforced plastic), and is provided with bolt insertion holes 74, 76, 78, 80 at predetermined positions at four positions.

The vicinity of both ends in the longitudinal direction of the insulating board 40 is fixed to the frame 72 by bolts 82 and nuts 84. On the surface of the insulating board 40, a recessed portion 86 for arranging the electrode plates is formed over the entire length in the longitudinal direction, and an electrode plate 68 made of an elongated plate-like copper nickel plating material is fitted into the recessed portion 86. Is arranged. The depth of the recessed portion 86 and the thickness of the electrode plate 68 are set to substantially the same dimension, and the upper surface of the electrode plate 68 in the recessed portion 86 and the upper surface of the insulating board 40 are located on the same extended plane. The electrode plate 68 and the stainless steel back plate 66 disposed on the back surface of the insulating board 40 communicate with the bolt insertion holes 74, 76, 78, 80 of the insulating board 40 in the vertical direction. Bolt insertion holes are drilled in the holes.

Stainless steel bolts 42, 44, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46, 46 are respectively inserted into the bolt insertion holes that communicate with each other in the vertical direction so as to penetrate the overlapped back plate 66, insulating board 40, and electrode plate 68. Each shaft part of 48 is inserted and arranged. The heads 42a, 44a, 46a, 48a of the bolts 42, 44, 46, 48 are in close contact with the back surface of the back plate 66, and the heads 42a, 44a, 46a, 48a are welded to the back surface of the back plate 66. It is fixed. Electrode nuts 50, 52, 54, 56 for receiving terminals, made of brass, are screwed onto the shaft portions on which the male threads of the respective bolts 42, 44, 46, 48 are formed.

Due to the tightening force of these terminal receiving electrode nuts 50, 52, 54, 56 against the corresponding bolts 42, 44, 46, 48, the insulating board 40, the electrode plate 68, and the back plate 66 become the terminal receiving electrode nut 50. , 52, 54, 56 and the heads 42a, 44a, 46a, 48a of the bolts 42, 44, 46, 48, the flat surfaces of the bolts 42 are in pressure contact with each other, and the terminal receiving electrode nuts 50, 52, 54 56, the lower flat surfaces F2 and f2 are fixed to the upper surface of the flat surface of the electrode plate 68 in surface contact therewith. Shaft portions of the respective bolts 42, 44, 46, 48 protrude from the upper flat surfaces F1, f1 of the corresponding terminal receiving electrode nuts 50, 52, 54, 56 by a predetermined length. Stainless steel nuts 58, 60, 62, and 64 with stainless steel washers 88, 90, 92, and 94 are prepared.

The bolt 42 on the power supply side is provided with a stainless nut 96 for tightening. The frame 72 is formed with a support portion 72a, and both ends of each phase of the insulation board 40 are placed on the support portion 72a. The insulation board 40 of each phase is attached to the back plate 66 mounting side by bolts 82 and nuts 84. Is fixed to the frame 72 with the bottom facing the terminal box (not shown).

As shown in FIG. 3, the terminal receiving electrode nuts 50, 52, 54, 56 made of brass are made of prismatic bodies having a regular hexagonal planar shape at both axial ends, and are used for bolts in the axial direction at the center of the prismatic body. Screw holes a and b, and flat surfaces F1, f1, F2, and f2 perpendicular to the axial direction are formed at both ends. The electrode protection insulating plate 70 made of FRP is prepared for covering the open surface side of the electrode plate 68. The electrode protection insulating plate 70 is provided with holes for avoiding the terminal receiving electrode nuts 50, 52, 54, and 56 so that the back surface thereof can be brought into contact with the surface of the electrode plate 68. These holes are formed into the terminal receiving electrode nuts. 50, 52, 54, and 56 can be detachably fitted.
The terminal receiving surface consisting of the flat surfaces F1, f1 of the terminal receiving electrode nuts 50, 52, 54, 56 and the bolts 42, 44, 46, 48 protruding from the terminal receiving surface are wide in the insulating board (40). A terminal coupling portion is formed on one side of the side.

  In the configuration described above, in order to connect (connect) the power supply side electric wire 98 to one terminal coupling portion of the plurality of terminal coupling portions of the terminal block 39, the fitting provided on the terminal 100 of the terminal of the electric wire 98 is provided. The joint portion is inserted into the shaft portion of the bolt 42. Next, the nut 58 with the washer 88 is screwed into the male screw of the shaft portion of the bolt 42 with the washer 88 facing downward, and the nut 58 is tightened to fix the washer 88 and the upper flat receiving surface F1 of the electrode nut 50 (terminal receiver). And the terminal 100 of the electric wire 98 is crimped to the flat receiving surface F1 on the upper portion of the electrode nut 50 in a surface contact state. After the terminal 100 of the electric wire 98 is crimped and fixed to the flat receiving surface F1 of the electrode nut 50, the nut 96 is further screwed onto the male screw of the shaft portion of the bolt 42 from above the nut 58, so that the terminal 100 is connected to the electrode nut 50. A double nut configuration is used to prevent loosening of the surface contact.

Similarly, when the terminal of the load side electric wire (not shown) is connected (connected) to the terminal receiving surfaces of the load side electrode nuts 52, 54, 56 constituting the terminal coupling portion, the selected bolt 44 is also connected. 46, 48 are inserted into the shaft portion where the male threads of the load side are fitted, and the fitting portion of the terminal side terminal with flat surfaces formed on both sides is inserted into the shaft portion of the bolts 44, 46, 48. Screw the nuts 60, 62, 64 with washers to screw the flat surfaces of the load-side electric wire terminals into the upper flat surface f1 (terminal receiving surface) of the selected load-side electrode nuts 52, 54, 56 and the washers 90, 92, 94, and the terminal of the load side electric wire is crimped and fixed to the selected load side electrode nuts 52, 54, 56 in a surface contact state.

In this state, between the power supply side electric wire 98 and the load side electric wire, the terminal 100 of the power supply side electric wire 98, the terminal receiving electrode nut 50 in which the flat surface F1 is in surface contact with the terminal 100, and the terminal receiving electrode nut. 50, an electrode plate 68 in surface contact with the lower flat surface f2, selected terminal receiving electrode nuts 52, 54, 56 in which the lower flat surface f2 is in surface contact with the electrode plate 68, and the terminal receiving electrode nuts 52, 54. , 56 is formed with a current-carrying path consisting of terminals of the load-side electric wires that are in surface contact with the upper flat surface f1, and power is supplied from the power source side to the load side through the current-carrying path.

  In the present embodiment, since power is supplied from the power source side to the load side through surface contact connection (connection) between the electrode nut and the electric wire side terminal and surface contact connection (connection) between the electrode nut and the electrode plate, Compared to a conventional product that is energized, the specific resistance and contact resistance are reduced, and the voltage drop and power loss are reduced. In addition, when fixing the terminal on the power source side to the electrode nut, even if the nut with a washer is screwed into the bolt, the bolt is fixed to the back plate, so that the bolt does not run idle.

  In this embodiment, since the electrode plate 68 is arranged on the surface of the insulating board 40 and the configuration in which the charging unit is exposed is adopted, the insulating protective plate 66 is formed on the electrode plate 68 simultaneously with the termination of the terminal connection (connection) operation. By attaching, the short circuit accident which arises when a tool and many electroconductive substances contact a charging part is prevented. FIGS. 8 to 10 are temperature rise test results of the terminal block in the present embodiment conducted at the Tokyo Metropolitan Industrial Technology Center. Satisfactory results were obtained regarding the temperature rise of the terminal block according to the present invention.

2 Insulating board 4 Electrode plate 6 Bolt 8 Bolt 10 Bolt 12 Bolt 14 Nut 16 Nut 18 Nut 20 Nut 22 Nut 24 Nut 26 Nut 28 Nut 30 Washer 32 Washer 34 Nut 36 Washer 37 Nut 38 Washer 39 Terminal block 40 Insulating board 42 Bolt 44 bolt 46 bolt 48 bolt 50 electrode nut 52 electrode nut 54 electrode nut 56 electrode nut 58 terminal mounting nut 60 terminal mounting nut 62 terminal mounting nut 64 terminal mounting nut 66 back plate 68 electrode plate 70 electrode protection insulating plate 72 frame 74 bolt insertion Hole 76 Bolt insertion hole 78 Bolt insertion hole 80 Bolt insertion hole 82 Bolt 84 Nut 86 Recessed portion 88 Washer 90 Washer 92 Washer 94 Washer 96 Nut 98 Electric wire 100 Terminal

Claims (3)

A terminal block provided with a plurality of terminal coupling parts each including a terminal receiving surface and a screw protruding from the terminal receiving surface on one side of the wide side of the insulating board (40), the insulating board (40) An electrode plate (68) is arranged on one surface on the wide side, the screws are arranged vertically through the insulating board (40) and the electrode plate (68), and the end of each screw is connected to the insulating board. The terminal receiving electrode nuts (50), (52), (54), and (56) that are locked to the other surface side of (40) and have flat surfaces at both ends in the axial direction are screwed into the respective screws, One flat surface of the terminal receiving electrode nut (50) (52) (54) (56) is brought into surface contact with the flat surface of the electrode plate (68), and each terminal receiving electrode nut (50) (52) ( 54) (56) the other flat surface is the terminal receiving surface, and each screw (42) (4) ) (46) (48) is provided with an anti-rotation mechanism for preventing the insulation board (40) from rotating, and a fitting portion of an electric wire terminal is inserted and arranged in the screw protruding from each terminal receiving surface. A nut (58) (60) (62) (64) is screwed onto the screw from above, and the flat surface of the terminal is brought into surface contact with the terminal receiving surface so as to be fixed by crimping. Terminal block. The anti-rotation mechanism has a configuration in which a back plate (66) is arranged on the other surface of the insulating board (40), and an end of each screw is fixed to the back plate (66) by welding. The terminal block according to claim 1. The terminal block according to claim 1, wherein an electrode protection insulating plate (70) is detachably disposed on the electrode plate (68).

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