JP2007285718A - Structure of bypass terminal and connecting terminal for measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure of a bypass terminal for a measuring instrument which does not require to be manufactured while making the terminal suit the kind of the instrument, and can be formed simply and inexpensively. <P>SOLUTION: This terminal structure comprises relay terminals 7 to be connected to either primary electric wire 6a or secondary electric wire 6b, individual terminal blocks 5 which are united with the relay terminals 7 individually and include contact conductors 12 each of which is connected to any one of a plurality of terminals provided in a watt-hour meter, and contacts 16 which are brought into contact with terminal blocks 5 so as to be separable freely, and a connecting object 15 provided with a connecting conductor 20 for connecting contacts 16 in pairs. The terminal blocks 5 are individually connected being adjusted to the number of the pieces of the primary wire 6a and the secondary wire 6b, and in addition terminal blocks 5 are shortcircuited and connected with the connecting object 15 to the same phase, to form a detour circuit for supplying power to a load side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, for example, when replacing or repairing a meter such as a watt hour meter, the replacement or repair work is performed without removing the primary side wire and the secondary side wire connected to the meter, that is, in an uninterruptible state. The present invention relates to a bypass terminal structure for an instrument, and a connection terminal structure that is derived from the structure and can be generally applied.

  A conventional instrument bypass terminal structure of this type has been publicly known that includes, for example, a terminal block that is detachably attached to a watt-hour meter and a switching connector for forming a bypass energization circuit. (See Patent Document 1).

  The terminal block is connected to the power supply side relay terminal to which the primary side electric wire is connected, to the load side relay terminal to which the secondary side electric wire is connected, to both the relay terminals and to the watt hour meter. And a conductor. This terminal block is connected to the watt hour meter in advance.

  The power supply side relay terminal and the load side relay terminal are sequentially arranged from the left side, and both relay terminals corresponding to the neutral wire are connected by a flat conductor.

  The switching connection body has three plate-like movable contacts provided so as to freely advance and retract, and a knob for manually operating the advance and retreat operation of each movable contact individually. The central movable contact contacts the adjacent power supply side and load side relay terminals, and the left and right movable contact terminals correspond to the corresponding power supply side and load side relay terminals, i.e., the relay terminals located at both ends of the terminal block. Each comes into contact.

When exchanging or checking the watt-hour meter, if each knob is rotated in the forward direction and the movable contact is brought into contact with each contact conductor of the terminal block, each contact conductor is short-circuited in the same phase. As a result, a bypass energization circuit is formed, the primary side electric wire and the secondary side electric wire are conductively connected, and the load side is energized, that is, the watt hour meter can be replaced and inspected in an uninterruptible state. Yes.
JP 2002-139518 A

  However, in the case of the above-described conventional instrument bypass terminal structure, since both the terminal block and the switching connector are integrated, it is necessary to prepare various types according to the type of watt-hour meter. Furthermore, since it is necessary to advance and retract the movable contact with the knob, there is a problem that the structure is complicated and the number of parts is increased correspondingly, resulting in an increase in cost.

  Therefore, in view of the above problems, the present invention does not need to be manufactured according to the type of instrument, and provides a simple and inexpensive instrument bypass terminal structure, and a connection terminal structure that is widely derived and applicable from this. The purpose is to provide.

  In order to solve the above-mentioned problems, the instrument bypass terminal structure according to the present invention is integrated with the relay terminal 7 to which either the primary side electric wire 6a or the secondary side electric wire 6b is connected, or the relay terminal 7. In addition, an individual terminal block 5 having a contact conductor 12 connected to any one of a plurality of terminals 2 provided in the meter 1, a contact 16 that contacts the individual terminal block 5 detachably, It is comprised from the connection body 15 provided with the connection conductor 20 which connects the contactor 16 to a set of two, It is characterized by the above-mentioned.

  Therefore, when the individual terminal block 5 is individually connected according to the number of wires of the primary side electric wire 6a and the secondary side electric wire 6b, and the individual terminal block 5 is short-circuited in the same phase by the connection body 15, A bypass energization circuit to the load side is formed at the terminal portion 2. That is, the instrument body can be separated from the terminal portion 2 of the instrument 1 while the load side is energized. In other words, the instrument 1 can be replaced or inspected without a power failure.

  Further, in the individual terminal block 5, a female terminal 10 having a tapered contact concave portion 11 that opens greatly toward the outside is provided between the relay terminal 7 and the contact conductor 12, and the contact of the connection body 15. 16 is preferably formed of a trapezoidal male terminal having a contact surface that can be brought into and out of contact with the contact recess 11 of the female terminal 10.

  In this case, as the male terminal 16 is inserted into the female terminal 10, the contact surface of the male terminal 16 comes into contact with the contact recess 11 of the female terminal 10, and the connection state of both terminals 10 and 16 is ensured. On the other hand, the contact area between the terminals 10 and 16 can be increased, and the current capacity generated in the event of a short circuit can be increased, thereby reducing the size. The trapezoidal shape here includes a circular truncated cone and a truncated pyramid.

  Furthermore, it is preferable to provide fastening means 25 for fastening the female terminal 10 of the individual terminal block 5 and the male terminal 16 of the connection body 15.

  In this case, a reliable contact state between the female terminal 10 and the male terminal 16 can be secured by fastening the female terminal 10 of the individual terminal block 5 and the male terminal 16 of the connection body 15.

  In addition, the fastening means 25 is inserted into the screw hole 11 a formed in the bottom of the contact recess 11 of the female terminal 10, the through hole 17 formed along the axis of the male terminal 16 a, and the through hole 17. In addition, the screw rod 26 may be configured to be screwed into the screw hole 11a.

  Then, the screw rod 26 inserted through the through hole 17 is screwed into the screw hole 11a of the female terminal 10, and the female terminal 10 and the male terminal 16 are brought into pressure contact as the screw rod 26 is screwed. So that they are connected.

  Further, it is preferable to form a screw groove 19 that is screwed into the screw rod 26 in the middle of the through hole 17.

  In this case, when the male terminal 16 is pulled out from the female terminal 10, the screw rod 26 is screwed into the screw groove 19, so that it is easy to pull out.

  Further, it is preferable to form a slit 18 in the male terminal 16 along the length direction so as to communicate with the through hole 17.

  In this case, the outer diameter of the male terminal 16 is reduced by the slit 18 as the screw rod 26 is screwed into the screw hole 11a, so that the contact is surely made.

  In addition, the connection terminal structure of the present invention is configured so that either the power-source-side conductor 6a or the load-side conductor 6b can be connected, and has a tapered contact concavity 11 that opens greatly toward the outside. The female terminal 10 is configured to be connectable to either the load-side conductor 6b or the power-source-side conductor 6a, and has a trapezoidal male shape having a contact surface that can come into contact with and separate from the contact recess 11 of the female terminal 10 And a terminal 16.

  The trapezoidal male terminal 16 is attached to and detached from the tapered contact recess 11 of the female terminal 10, so that when the male terminal 16 is inserted into the contact recess 11 of the female terminal 10, the surfaces of each other Will be in pressure contact, and will surely come into surface contact. On the other hand, as the male terminal 16 is pulled out from the contact recess 11 of the female terminal 10 along the axial direction, the surfaces of the male terminal 16 are separated from each other, and a connection terminal that can be detached relatively easily can be provided.

  Further, according to the connection terminal structure of the present invention, the male terminal 30 formed with the conical contact surfaces 31 projecting in the opposite directions, and the contact recesses 33 that can contact and separate from the contact surfaces 31, 31 are provided. And a pair of female terminals 32 and a power-side conductor 6a and a load-side conductor 6b connected to the female terminals 32 and 32, respectively.

  In this case, since the conical contact surface of the male terminal protrudes on both sides, the female terminal can be rotated around the contact surface, and the position of the female terminal, that is, connected to the female terminal Thus, it is possible to fix the conductors at desired positions. Therefore, if it is an electric wire, it can be drawn around to a favorite position.

  As described above, according to the present invention, since it is individually connected according to the number of wires of the primary side wire and the secondary side wire, it is not necessary to prepare separately according to the model, and it corresponds to various types. it can. Furthermore, since only the trapezoidal male terminal and the female terminal having the tapered contact concave portion are brought into contact with each other, the structure is simple, and the number of parts is not increased, and there is an effect that it can be manufactured at low cost.

(Embodiment 1)
Hereinafter, the instrument bypass terminal structure according to Embodiment 1 of the present invention will be described with reference to the accompanying drawings.

  The instrument bypass terminal structure of the present embodiment is such that, for example, a meter such as a watt hour meter, to which the primary side wire and the secondary side wire are connected, the meter can be replaced or repaired while the load side is energized. Is. In the present embodiment, an instrument bypass terminal structure used in the watt-hour meter 1 will be described as an example. This instrument bypass terminal structure includes, for example, as shown in FIGS. 1 and 2, an individual terminal block 5 that is detachably attached to a plurality of terminals 2 provided in the watt hour meter, and the individual terminal block 5 The connection body 15 forms a detour energization circuit for maintaining the energization state to the load side. In addition, the watt-hour meter 1 shall be comprised so that the terminal 2 and the meter main body 3 can be attached or detached.

  The individual terminal block 5 includes a vertically-long rectangular parallelepiped relay terminal 7, a horizontally-long rectangular parallelepiped female terminal 10 integrally provided at the upper end of the relay terminal 7, and a base end thereof integrally with the upper surface of the female terminal 10. And a bar-shaped contact conductor 12 which is extended in a straight line. The relay terminal 7, the female terminal 10, and the contact conductor 12 are an integrated metal body (electrical conductor), and can be used when electricity is supplied from outside or led out to the outside. it can.

  In the lower part of the relay terminal 7, an insertion hole 8 is connected along the axis to which one of the outdoor electric wire (primary side electric wire) 6 a on the power source side or the indoor electric wire (secondary side electric wire) 6 b on the load side is connected. Is formed. In addition, a plurality of set screws 9 are screwed into the side wall portion on the front side of the insertion hole 8 in a direction perpendicular to the axis of the insertion hole 8, and the outdoor screw 6 a or the indoor cable 6 b is connected by the set screw 9. The connection state can be maintained.

  The female terminal 10 has a contact recess 11 formed along the axis thereof from the front end to the rear, and the contact recess 11 has a taper shape that is greatly opened toward the outer side (front side). Further, a screw hole 11 a into which a tip end of a screw rod 26 described later is screwed is formed at the bottom of the contact recess 11 along the axis thereof.

  The contact conductor 12 is positioned substantially concentrically with respect to the insertion hole 8 of the relay terminal 7, and is detachably connected to the terminal 2 provided in the watt hour meter 1, for example.

  The individual terminal block 5 is covered with an insulating case 13 made of a rubber material or a synthetic resin material. However, the screwed portion of the set screw 9 of the relay terminal 7, the opening of the insertion hole 8 of the relay terminal 7, the opening of the contact recess 11 of the female terminal 10, and the tip end side of the contact conductor 12 are not covered.

  The connection body 15 includes a male terminal 16 as a contact having a contact surface that can be brought into and out of contact with the contact recess 11 of the female terminal 10, and a cable 20 as a connection conductor for connecting the male terminals 16 in pairs, Fastening means 25 for fastening the female terminal 10 of the individual terminal block 5 and the male terminal 16 of the connection body 15 is provided.

  The male terminal 16 has a trapezoidal shape (conical frustum shape) corresponding to the contact recess 11 of the female terminal 10, the small diameter portion is located at the back of the contact recess 11, and the large diameter portion is the contact recess 11. The male terminal 16 and the female terminal 10 are connected to each other when they are positioned at the open ends. Further, a through hole 17 is formed along the axis of the male terminal 16, and a slit 18 is formed along the length direction on the peripheral surface. The slit 18 communicates with the through hole 17 and is formed in a radially outward direction of the through hole 17. That is, as the male terminal 16 is inserted from the opening end of the contact recess 11 of the female terminal 10 toward the back, the width of the slit 18 is reduced and the through hole 17 is reduced in diameter. Due to the reduced diameter, a stress that increases the diameter of the male terminal 16 in the radially outward direction acts on the cylindrical portion of the male terminal 16, and the outer peripheral surface of the male terminal 16 comes into pressure contact with the inner peripheral surface of the contact recess 11.

  Further, a screw groove 19 is formed in the middle of the through hole 17, thereby providing a double fastening structure and a drawing structure for the male terminal 16. That is, since the male terminal 16 is screwed into the screw hole 11a of the female terminal 10 in a state where a screw rod 26, which will be described later, is screwed into the screw groove 19, the male terminal 16 is firmly inserted to the back end portion of the contact recess 11. The surface contact is surely made. On the other hand, even if the screw rod 26 is released from the screw hole 11a, if the screw rod 26 is screwed into the screw groove 19, the screw rod 26 and the male terminal 16 are integrated. The male terminal 16 can be easily pulled out from the female terminal 10 by grasping the head of the rod 26.

  The cable 20 is covered with insulation except for both ends, and exposed conductors 21 at both ends are welded to the wide end surface of the male terminal 16. Furthermore, this welded part is protected by a cylindrical protective member (tube) 22 having insulating properties.

  The fastening means 25 is inserted into the screw hole 11 a of the female terminal 10, the through hole 17, the slit 18, and the screw groove 19 of the male terminal 16, and the through hole 17, and is screwed into the screw hole 11 a and the screw groove 19. And a threaded rod 26. The screw rod 26 has a rod shape from the intermediate portion to the head portion, and has a screw portion from the intermediate portion to the tip portion, and the rod portion has a smaller diameter than the screw portion. As the screw rod 26, a flat screw or a countersunk screw can be selected.

  Next, the usage mode will be described. First, the contact conductor 12 of the individual terminal block 5 is connected in advance to the plurality of terminals 2 provided in the watt hour meter 1, and further, the outdoor wire 6 a and the relay terminal 7 of the individual terminal block 5 are connected. The indoor electric wires 6b are connected in advance according to the number of wires such as a three-phase three-wire system and a single-phase two-wire system. Although it is simplified in FIG. 1, it is assumed that the three-phase three-wire system includes three outdoor wires 6a and three indoor wires 6b divided into a left half and a right half.

  In this state, when the watt-hour meter 1 is exchanged or inspected, the male terminal 16 is brought into contact with the female terminal 10 of the individual terminal block 5. That is, after inserting the trapezoidal male terminal 16 into the tapered contact recess 11 of the female terminal 10 and screwing the screw rod 26 into the screw groove 19 of the male terminal 16, the screw hole 11 a of the female terminal 10. Screw in and tighten. At this time, as described above, as the male terminal 16 is inserted, the gap between the slits 18 of the male terminal 16 is reduced, the inner diameter of the male terminal 16 is reduced, and the taper of the male terminal 16 is tapered on the wall surface of the contact recess 11. The surfaces are pressed against each other and contact is made reliably.

  As a result, the in-phase contact conductors 12 are short-circuited, the in-phase outdoor electric wire 6a and the indoor electric wire 6b are conductively connected, and a detour energization circuit to the load side is formed. In this state, the meter body 3 can be separated from the terminal portion 2 of the watt hour meter 1 so that the watt hour meter 1 can be replaced or inspected.

  In the case of the first embodiment, the female terminal 10 and the male terminal 16a have the bypass terminal structure of the watt hour meter 1, but such a structure is simply a power supply side electric wire (conductor) and a load side electric wire (conductor). Needless to say, it can be extended and used as a connection terminal structure for connecting the two.

  Further, in the case of the first embodiment, the watt-hour meter for obtaining the time integral of the electric power has been described as an example. However, the present invention can be applied to other meters such as a reactive watt-hour meter, a coulometer, and a digital meter. .

(Embodiment 2)
Next, a connection terminal structure according to Embodiment 2 will be described with reference to FIG.
The connection terminal structure of the present embodiment includes a male terminal 30 having a contact surface 31, a pair of female terminals 32 having a contact recess 33 that can be contacted and separated from the contact surface 31 of the male terminal 30, and the male terminal 30 and the female terminal. It is comprised from the fastening member which fastens 32.

  The male terminal 30 has a substantially rhombus shape when viewed from the side, and has contact cones 31 that are trapezoidal (conical frustum-shaped) protruding in opposite directions. Furthermore, a through hole 31a for inserting a screw rod of a fastening member described later is formed along the axial direction. In addition, a slit 31b is formed on the peripheral surface of the male terminal 30 along the length direction.

  The female terminal 32 has a comparatively flat rectangular parallelepiped shape, and a tapered contact concave portion 33 that is largely opened toward the outer side is formed in the thickness direction at a substantially center thereof. In addition, an insertion hole 33a for allowing the screw rod 35 to pass through is formed from the bottom to the rear of the contact recess 33. Furthermore, the conductor ends of the electric wires 6a and 6b connected to the power supply side and the load side are welded to the lower part of the back surface, the contact recess 33 of the female terminal 32 and the ends of the electric wires 6a and 6b welded to the back surface thereof. Are electrically connected to each other.

  In a state where both the male terminals 30 and the female terminals 32 are integrated, the fastening member passes through the insertion hole 33a of one female terminal 32 and the through hole 31a of the male terminal 30 to the insertion hole 33a of the other female terminal 32. The female terminal 32 and the male terminal 30 are integrated with each other by screwing into a relatively long screw rod 35 to be inserted and the tip of the screw rod 35 protruding from the insertion hole 33a of the other female terminal 32. And a nut 36 for maintaining the above state.

  Next, the usage mode will be described. After one contact surface 31 of the male terminal 30 is inserted into the contact recess 33 of one female terminal 32, the other contact surface 31 of the male terminal 30 is inserted into the contact recess 33 of the other female terminal 32. At this time, as the male terminal 30 is inserted, the interval between the slits 31 b of the male terminal 30 is reduced, the inner diameter of the male terminal 30 is reduced, and the tapered surface of the contact surface 31 of the male terminal 30 is formed on the wall surface of the contact recess 33. Will come into pressure contact and contact will be ensured.

  When the female terminals 32 and the male terminals 30 are in reliable contact with each other, the opposing surfaces of the female terminals 32 come into contact with each other, and the male terminals 30 are hidden by the contact recesses 33 of the female terminals 32 and cannot be seen from the outside.

  In this state, the screw rod 35 is inserted from the insertion hole 33a of one female terminal 32, passed through the through hole 31a of the male terminal 30, and inserted into the insertion hole 33a of the other female terminal 32, and the other female terminal. The tip end portion of the screw rod 35 protrudes from the insertion hole 33 a of 32, and the nut 36 is screwed into the tip portion of the protruding screw rod 35.

  At this time, since the opposing surfaces of both female terminals 32 are flat, the positions of the electric wires 6a and 6b can be rotated to a desired position when the opposing surfaces of both female terminals 32 are in contact with each other. Therefore, the electric wires 6a and 6b are rotated to desired positions, the screw rod 35 and the nut 36 are tightened, and the state where both the female terminals 32 and the male terminals 30 are integrated is maintained.

  In the case of the second embodiment, the connection terminal structure including the pair of female terminals 32 and the single male terminal 30 that can be connected to and separated from each female terminal 32 has been described. However, the present invention is not limited to this. Instead, a plurality of female terminals 32 integrated side by side and a plurality of male terminals 30 similarly integrated may be used.

  In the second embodiment, the electric wire is welded to the lower part of the back surface of the female terminal 32, but it may be a conductor.

  Furthermore, although the contact surface of the male terminals 16 and 30 of each of the first and second embodiments is a truncated cone shape, it may be a truncated cone shape.

It is a perspective view which shows the bypass terminal structure for instruments which concerns on Embodiment 1 of this invention. It is a sectional side view of FIG. It is sectional drawing which shows the connection terminal structure which concerns on Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electricity meter (instrument), 2 ... Terminal, 3 ... Instrument main body, 5 ... Individual terminal block, 6a ... Outdoor electric wire (primary side electric wire), 6b ... Indoor electric wire (secondary side electric wire), 7 ... Relay terminal, 8 ... Insertion hole, 9 ... Set screw, 10, 32 ... Female terminal, 11, 33 ... Contact recess, 11a ... Screw hole, 12 ... Contact conductor, 13 ... Case, 15 ... Connector, 16, 30 ... Male terminal ( Contact), 17, 31a ... through hole, 18, 31b ... slit, 19 ... screw groove, 20 ... cable (connection conductor), 21 ... conductor, 22 ... tube, 25 ... fastening means, 26, 35 ... screw rod, 33a ... insertion hole, 36 ... nut

Claims (8)

A relay terminal (7) to which either the primary side electric wire (6a) or the secondary side electric wire (6b) is connected, and a plurality of units provided in the instrument (1), which are integrated with the relay terminal (7) An individual terminal block (5) having a contact conductor (12) connected to any one of the terminals (2) of
A contact (16) that comes into contact with and separates from the individual terminal block (5), and a connection body (15) provided with connection conductors (20) that connect the contacts (16) in pairs. A bypass terminal structure for an instrument characterized by being made. The individual terminal block (5) has a female terminal (10) having a tapered contact concave portion (11) which is greatly opened toward the outside between the relay terminal (7) and the contact conductor (12). Provided,
The contact of the connector (15) comprises a trapezoidal male terminal (16) having a contact surface that can be contacted with and separated from the contact recess (11) of the female terminal (10). The instrument bypass terminal structure as described in 1.   The fastening means (25) for fastening the female terminal (10) of the individual terminal block (5) and the male terminal (16) of the connection body (15) is provided. Bypass terminal structure for instruments.   The fastening means (25) includes a screw hole (11a) formed in the bottom of the contact recess (11) of the female terminal (10) and a through hole (17 formed along the axis of the male terminal (16). And a screw rod (26) inserted through the through hole (17) and screwed into the screw hole (11a). Construction.   5. The instrument bypass terminal structure according to claim 4, wherein a thread groove (19) that is screwed into the threaded rod (26) is formed in a middle portion of the through hole (17).   The instrument bypass according to claim 4 or 5, wherein the male terminal (16) is formed with a slit (18) along its length to communicate with the through hole (17). Terminal structure.   Either one of the power supply side conductor (6a) or the load side conductor (6b) is configured to be connectable, and has a female terminal (10) having a tapered contact concave portion (11) that opens greatly toward the outside. ) And either the power source side conductor (6a) or the load side conductor (6b) are configured to be connectable, and a contact surface that can be contacted and separated from the contact recess (11) of the female terminal (10) is provided. A connection terminal structure comprising a trapezoidal male terminal (16).   A pair of females having a male terminal (30) formed with a trapezoidal contact surface (31) projecting in opposite directions, and a contact recess (33) capable of contacting and separating from each contact surface (31, 31) A connection terminal structure comprising a terminal (32), a power supply side conductor (6a) and a load side conductor (6b) connected to the female terminals (32, 32), respectively.

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