JP2008293832A - Terminal connection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a terminal connection device capable of stabilizing the contact of a contact section without increasing pressure force of a pressure member even though there is a center gap between connected terminals caused by large current flow due to an accident or the like. <P>SOLUTION: In the terminal connection device having a plurality of contactors 3 arranged to straddle both ends on the outer peripheral surface of ends where a first terminal 1 and a second terminal 2 are faced with each other, a guide plate 4 fixed on the end face of the first terminal 1 and regulating a movement of each contactor 3 in the axial and peripheral directions by making a plurality of recessed sections formed at an outer periphery connect with a locking groove 3c in the inside of each contactor 3, and the circular pressure member 5 mounted on a plurality of hollow sections on the outer periphery of each contactor 3 connected with the guide plate 4 and adding pressure force toward an axial center against each contactor 3, a guide ring 6 loosely fitted by preparing a small gap on the outer peripheral surface of each contactor 3 is arranged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a terminal connection device used for, for example, a connection portion between a primary terminal such as a switch or a circuit breaker and a fixed frame side terminal connected to the primary terminal.

An example of a conventional terminal connection device is shown in FIG. The figure is a side sectional view of the terminal connection device.
A terminal connection device that connects the first terminal 21 and the second terminal 22, and a plurality of contacts 23 having contact surfaces that come into contact with both the terminals 21 and 22 are arranged on the outer periphery of the first terminal 21. A guide plate 24 having recesses formed at predetermined intervals in the outer circumferential direction is fixed to the first terminal 21 inside the contact 23. The concave portion of the guide plate 24 is engaged with a groove formed inside the contact 23 so that the contact 23 is not displaced in the outer circumferential direction and the axial direction. Furthermore, a compression spring 25 is provided for pressing the contact 23 against both terminals 21 and 22 from the outer peripheral side of the contact 23. In this state, the second terminal 22 can be attached to and detached from the contact 23, and the two terminals 21 and 22 are electrically connected by inserting the second terminal 22 into the contact 23. It is configured. The current flows through the terminal connection device 26 along a path indicated by an arrow in the figure (for example, see Patent Document 1).

JP 11-31441 A (page 3-4, FIG. 1)

  In the conventional terminal connection device 26 as shown in Patent Document 1, when a current flows as shown by an arrow, an electromagnetic force acts in a direction in which the contactor 23 and both terminals 21 and 22 are separated. FIG. 8 shows an application example of the terminal connection device. For example, the case where the terminal connection device 26 is used in the connection portion between the circuit breaker side terminal 27a and the main circuit side terminal 28 of the circuit breaker 27 housed in a switchgear or the like. FIG. When a ground fault or the like occurs, a large current generated by the accident is cut off in the arc extinguishing chamber of the circuit breaker, for example, a vacuum valve. When a large current flows through the circuit breaker, an electromagnetic repulsive force is generated between the contactor 23 and both terminals 21 and 22. Since this electromagnetic repulsive force works in the direction of releasing the contact of the contact 23, the contact is not released by pressing with the compression spring 25 arranged on the outer peripheral side of the contact 23, that is, the generated electromagnetic repulsive force is beaten. Set the spring strength to win. Further, due to a large current generated by a ground fault or the like, as shown by an arrow in FIG. 8, an electromagnetic force is applied to the circuit breaker 27 so as to jump forward with the interlock pin 29 as a fulcrum.

When the breaking current is large, the electromagnetic force that tries to jump out of the circuit breaker 27 becomes larger, the center of the first terminal 21 and the second terminal 22 is displaced, and the contact 23 and the second terminal 22 The contact part becomes oblique and the contact becomes unstable. When the contact becomes unstable, melting damage or arcing due to heat generation occurs between the contact 23 and the second terminal 22. In order to prevent such melting and arcing, it is necessary to increase the pressing force of the compression spring 25 and increase the force directed from the outside to the inside of the contactor 23.
When the pressing force of the compression spring 25 is increased and the force directed from the outside to the inside of the contactor 23 is increased, for example, it is fixed to the circuit breaker terminal 27a (first terminal) on the circuit breaker 27 side as shown in FIG. When the terminal connection device 26 is inserted into the main circuit side terminal 28 (second terminal) on the fixed frame side, there is a problem that the insertion force becomes large and the insertion becomes difficult. Also, in order to increase the strength (rigidity) of the components constituting the circuit breaker 27 for insertion, to increase the strength (rigidity) of the insertion handle necessary for insertion, or to insert manually There was a problem that the insertion handle had to be lengthened.

  The present invention has been made to solve the above-described problems. A large current flows due to an accident or the like without increasing the pressing force of the pressing member (spring), and the terminal to be connected is displaced from the center. Even in such a case, an object is to obtain a terminal connecting device that can be regulated within an allowable value and can stabilize the contact of the contact portion.

  In the terminal connecting device according to the present invention, both terminals are opposed to each other in order to electrically connect a round bar-shaped first terminal and a second terminal arranged on the substantially same axis with a predetermined interval. A plurality of contacts disposed across the both ends on the outer peripheral surface of the end portion, and a plurality of contacts fixed to the end surface of the first terminal, and a plurality of recesses formed on the outer periphery are formed inside each contact. Formed on a disc-shaped guide plate that engages with the stop groove to restrict each contactor from moving in the axial direction and circumferential direction of the first terminal, and on the outer peripheral surface of each contactor that engages with the guide plate And an annular pressing member that applies a pressing force toward the axial center to each contact, and is loosely fitted with a small gap on the outer peripheral surface of each contact. A guide ring is provided to restrict each contact from opening in the radial direction.

  According to the terminal connection device of the present invention, in the terminal connection device for connecting the terminals provided on the outer circumferences of the both terminals to be connected to each terminal by the pressing member, a small gap is provided on the outer circumferential surface of each contact. Since a loosely fitting guide ring is provided and each contactor is restricted from opening in the radial direction, even if a large current flows and a center deviation occurs in both terminals, the center deviation is forcibly regulated within an allowable value. In order to maintain stable and stable contact, it is not necessary to increase the pressing force of the pressing member in preparation for center displacement, and a large insertion force is not required at the time of inserting a terminal, and an inexpensive terminal connection device can be obtained with a simple configuration. Can do.

Embodiment 1 FIG.
Hereinafter, the present invention will be described with reference to the drawings.
1 is a side cross-sectional view of a terminal connection device according to Embodiment 1, FIG. 2 is a front view of FIG. 1 as viewed from the direction of arrow II, FIG. 3 is a detailed view of the contact of FIG. FIG. 5 is a detailed view of the guide ring, viewed from the arrow IV-IV. FIG. 6 is a diagram for explaining positional misalignment between terminals when a large current flows through the terminal connection device.

  The terminal connection device 10 is for electrically connecting the round-bar-shaped first terminal 1 and the second terminal 2 that are arranged on the substantially same axis with a predetermined interval. As shown in FIG. 1 and FIG. 2, a plurality of contacts 3 are arranged at equal intervals in the outer circumferential direction across both ends on the outer circumferential surface of the opposing ends of both terminals 1, 2. In a state where a plurality of contacts 3 are arranged and combined, they are formed in a substantially cylindrical shape as a whole. In the following description, this state is referred to as a contact group.

  The details of the contact 3 will be described with reference to FIG. The contact 3 is made of a conductive member, and as shown in the side view of (a), on the side facing the terminal in the longitudinal direction, the first contact surface 3a that contacts the first terminal 1, A second contact surface 3b that contacts the second terminal 2 is formed, and a locking groove 3c that engages with a guide plate 4 described later is formed in the vicinity of the center. On the surface opposite to the contact surface in the longitudinal direction, a plurality of recesses 3d to 3g are formed to engage with a ring-shaped spring 5 which is a pressing member to be described later and prevent the displacement. The shape seen from the front is substantially trapezoidal as shown in FIG. In addition, the shape of this contactor 3 is an example, and is not limited to the figure.

  A disc-shaped guide plate 4 is fixed to the end face of the first terminal 1 inside the contact group by a bolt with the center aligned with the first terminal 1. As shown in the cross-sectional view of FIG. 4, the guide plate 4 has a gear shape in which a plurality (the same number as the contacts 3) of recesses 4 a are formed at equal intervals in the circumferential direction. By engaging with a locking groove 3 c formed inside 3, each contact 3 is restricted from moving in the axial direction and circumferential direction of the first terminal 1.

  A spring 5 that is a pressing member for applying a pressing force toward the axial center to the contact group is attached to each of the plurality of depressions 3 d to 3 g formed around each contact 3. The spring 5 is formed, for example, by connecting coil springs in an annular shape. By the pressing force of the spring 5, the first contact surface 3a and the first terminal 1 of the contactor 3 and the second contact surface 3b and the second terminal 2 are brought into firm contact with each other, thereby reducing the contact resistance. The current is normally supplied by keeping it below a certain level. For this reason, the arrangement position of the spring 3 is set such that an appropriate pressing force is applied to each of the outer peripheral side of the first terminal 1 and the outer peripheral side of the second terminal 2.

Further, as a feature of the present invention, a guide ring 6 that is loosely fitted with a small gap is provided on the outer peripheral surface of each contact 3, that is, on the outer peripheral surface of a contact group formed in a cylindrical shape. The guide ring 6 is made of, for example, stainless steel and has an annular shape as shown in FIG. 5, and the inner diameter D thereof is slightly larger than the outer diameter d of the contact group formed in the cylindrical shape shown in FIG. is doing. The operation of the guide ring 6 will be described later.
As described above, the terminal connection device 10 is configured by the contact 3, the guide plate 4, the spring 5, and the guide ring 6.

The connection operation of the terminal connection device 10 configured as described above will be described.
Since the terminal connection device 10 is used, for example, in the connection part of the circuit breaker housed in the switchboard as shown in FIG. 8 described in the background section, the operation will be described with reference to FIG. It is assumed that the terminal connection device 10 of the present invention is used instead of the terminal connection device 26 in the figure. The first terminal 1 corresponds to the circuit breaker terminal 27 a on the circuit breaker 27 side, and the second terminal 2 corresponds to the main circuit side terminal 28. The circuit breaker 27 is mounted on the carriage and is cut off at the portion of the terminal connection device 10 so that it can be pulled out to the front of the switchboard. In the disconnected state, the terminal connection device 10 is fixed to the circuit breaker terminal 27 side via the guide plate 4 and therefore remains on the circuit breaker 27 side, and the inner side of the contact 3 on the second terminal 2 side is cylindrical. A shaped space is formed. When connecting, the main circuit side terminal 28 is inserted into the space at the tip of the terminal connecting device 10 by pushing the circuit breaker 27 backward, and the contact 3 is pressed by the spring 5 with a predetermined contact pressure and stabilized. It becomes a contact and it will be in the state which can be electrically supplied.

Next, the operation of the guide ring 4 will be described.
The pressing force of the spring 5 is determined in consideration of the electromagnetic repulsive force generated by the short-circuit current flowing through the terminal connection device 10 and the first terminal 1 and the second terminal 2. In the state where the second terminal 2 is inserted into the terminal connection device 10, when a large current flows through the terminal connection device 10 due to a ground fault or the like, an electromagnetic repulsive force is generated between the contact 3 and both terminals 1, 2. Occurs. Further, an electromagnetic force is applied to make the circuit breaker 27 jump out forward. The circuit breaker 27 is fixed by an interlock pin 29 to prevent the circuit breaker 27 from being pulled forward. As shown by an arrow in FIG. 8, the engaging portion between the interlock pin 29 and the interlock hole of the floor board is used as a fulcrum. The center moment of the first terminal 1 and the center axis of the second terminal 2 are generated.

FIG. 6 is an explanatory diagram when the terminals to be connected are displaced when a ground fault or the like occurs.
The terminal connection device 10 is designed with a certain allowable value with respect to the center deviation G of both terminals 1 and 2. When the center deviation G between the first terminal and the second terminal generated by the forward electromagnetic force generated when a large current flows exceeds a certain allowable value, the contact 3 of the terminal connecting device 10 and the second terminal The number of contacts with the second terminal 2 is reduced. In this state, when a large current flows through the contact portion, heating occurs at the contact portion, causing melting and arcing between the contact 3 and the second terminal 2.

When the center shift G between the first terminal 1 and the second terminal 2 exceeds a certain allowable value, the guide ring 6 is arranged on the outer periphery of the contact 3 as in the present embodiment, thereby connecting the terminals. The center shift of both terminals 1 and 2 of the device 10 can be forcibly restricted so as not to exceed an allowable value.
Thus, by providing the guide ring 6, it is possible to suppress the center deviation G of both the terminals 1 and 2 within an allowable value without increasing the spring 5 and increasing the pressing force.
Further, since it is not necessary to increase the pressing force of the spring 5, it is not necessary to increase the insertion force when the second terminal 2 is inserted, and therefore it is possible to easily insert with a small force.

  In the terminal connection device 10 described above with reference to FIGS. 1 to 6, the pressing force on the contact surface between the contact 3 and the first terminal 1 is greater than the pressing force on the contact surface between the contact 3 and the second terminal 2. A case has been described in which the spring 5 as a plurality of pressing members is disposed at a position where the guide ring 6 is disposed only on the contact surface side between the contact 3 and the second terminal 2. That is, the recess 3d shown in FIG. 3 is formed at a position closer to the locking groove 3c than the recess 3g. Further, the distance between the recess 3e and the locking groove 3c and the distance between the recess 3f and the locking groove 3c are approximately the same distance. And the guide ring 6 was arrange | positioned on the outer periphery of the contactor group between the hollow parts 3g-3f.

If comprised in this way, since the pressing force provided to the 1st contact surface 3a becomes larger than the pressing force provided to the 2nd contact surface 3b, when the 2nd terminal 2 is extracted, the 1st The contact surface 3a and the first terminal 1 are not separated from each other, and the insertion force of the second terminal 2 may be small.
In addition, when both terminals 1 and 2 are displaced from the center, the contact on the second terminal 2 side where the pressing force is weak tends to come off first, so that the guide ring is on the contact surface side with the second terminal 2. By providing, it is possible to forcibly regulate the center deviation within an allowable value.

The number and arrangement position of the springs 5 are not limited to those shown in the drawing, and the guide ring 6 may be provided on the contact surface side between the contact 3 and the first terminal 1, for example.
In the above description, the terminal connection device is used for the connection part of a circuit breaker housed in a switchboard or the like. However, a switch other than the circuit breaker may be used, and for use in a switchboard such as a switchgear. Without limitation, the same effect can be obtained by applying to a terminal connection portion of a device in which a large current flows.

  As described above, according to the invention of the present embodiment, in the terminal connection device that connects the contacts provided on the outer circumferences of the first terminal and the second terminal by pressing the two terminals with the pressing member, each contact Since a guide ring that loosely fits in the outer peripheral surface of the child is provided and each contact is restricted from opening in the radial direction, even if a large current flows and a center shift occurs between both terminals, the contact In order to maintain stable contact by forcibly regulating the center deviation within an allowable value so that no melting damage or arcing occurs between the terminal and the terminal, the pressing force of the pressing member is increased in preparation for the center deviation In addition, it is not necessary to use a large insertion force when inserting a terminal, and an inexpensive terminal connection device can be obtained with a simple configuration.

  A plurality of pressing members are arranged at positions where the pressing force of the contact surface between the contact and the first terminal is larger than the pressing force of the contact surface between the contact and the second terminal. Since the guide ring is provided on the contact surface side with the terminal 2, the contact surface of the contact does not move away from the first contact surface when the second contact is removed, and the insertion force during the connection operation is increased. When both terminals are displaced from the center, the guide ring is provided on the second terminal side where the pressing force is weak, so that the center displacement can be efficiently regulated within an allowable value.

It is side surface sectional drawing of the terminal connection apparatus by Embodiment 1 of this invention. It is the front view seen from the arrow II direction of FIG. It is detail drawing of the contactor of FIG. It is sectional drawing seen from IV-IV of FIG. It is detail drawing of the guide ring of FIG. It is a figure explaining the position shift of terminals when a big current flows into a terminal connection device. It is side surface sectional drawing of the conventional terminal connection apparatus. It is a figure which shows the example of application of a terminal connection apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st terminal 2 2nd terminal 3 Contact 3a 1st contact surface 3b 2nd contact surface 3c Locking groove 3d-3g Recessed part 4 Guide plate 4a Recessed part 5 Spring (pressing member)
6 Guide ring 10 Terminal connection device.

Claims (2)

In order to electrically connect the round bar-shaped first terminal and the second terminal, which are arranged at a predetermined interval on substantially the same axis,
A plurality of contacts arranged across the both end portions on the outer peripheral surface of the opposite end portions of the two terminals;
A plurality of recesses formed on the outer periphery are fixed to the end surface of the first terminal and engage with a locking groove formed on the inner side of each contact so that each contact is an axis of the first terminal. A disc-shaped guide plate that restricts movement in the direction and circumferential direction;
A terminal connection comprising: an annular pressing member that is attached to a plurality of depressions formed on the outer peripheral surface of each contactor engaged with the guide plate and applies a pressing force toward the axial center to each contactor In the device
A terminal connection device, characterized in that a guide ring that is loosely fitted with a small gap is provided on the outer peripheral surface of each contact so as to restrict the opening of each contact in the radial direction.   2. The terminal connection device according to claim 1, wherein the pressing force of the contact surface between the contact and the first terminal is larger than the pressing force of the contact surface between the contact and the second terminal. A terminal connecting device, wherein a plurality of the pressing members are arranged, and the guide ring is provided on a contact surface side between the contact and the second terminal.

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