JP4410073B2 - Contact device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a contact device that connects opposing terminals via a bridge-type contact by moving one of the terminals, and more particularly to a contact device that is not disconnected once connected.

  In electrical equipment that has been used for many years, renewal work including replacement of equipment may be performed in order to avoid failure due to deterioration of various equipment constituting the equipment and to introduce the latest technology. In the renewal work, it is necessary to limit the power failure circuit and the power failure time as much as possible so as not to disturb the ongoing production activities as much as possible. For example, when replacing a circuit breaker housed in a switchboard, etc., it is unavoidable that power supply to the load device connected to this circuit breaker is stopped. The other load devices are considered so that the power supply can be continued.

  The above-mentioned circuit breaker, particularly a circuit breaker having a large current capacity, is often a drawer type having a drawer frame fixed to the switchboard, a circuit breaker body that moves within the drawer frame, and a drawer operation mechanism that moves the circuit breaker body. . This drawer type circuit breaker includes a frame terminal provided in the drawer frame, a body terminal connected to a switching contact incorporated in the circuit breaker body, and a drawer contact device provided in either the frame terminal or the body terminal. Have The end of the frame terminal that protrudes from the lead frame is a conductor connection end with the external conductor, and the inner end of the lead frame forms a contact end that contacts the main body terminal. And the circuit breaker main body is movable between the connection position where the frame terminal and the main body terminal come into contact via the drawer contact device and the disconnecting position where the terminal is opened. For this reason, the circuit breaker body can be moved to the disconnection position and safely removed from the drawer frame without stopping the operation of the power supply device. The drawer type circuit breaker is often inspected because the circuit breaker body that is opened and closed many times is deteriorated, but the drawer frame is hardly deteriorated because there are few movable members.

On the other hand, the circuit breaker has been reduced in size for many years. In the renewal work, only the breaker body of the existing drawer type circuit breaker is removed, and the new circuit breaker is placed in the remaining drawer frame with little deterioration. It is also possible to store the entire drawer frame. In such replacement work, instead of connecting a conductor to the conductor connection end of the frame terminal of the new circuit breaker, a retrofit circuit breaker with a bridge-type contact device as described later is configured. There are things to do. Such a retrofit circuit breaker can be easily connected to the power supply device by pushing it into the drawer frame of the existing circuit breaker so that the contact device contacts the contact end of the frame terminal of the existing circuit breaker. .
That is, since the existing bus bar that connects the frame terminal of the existing circuit breaker and the power supply device can be used as it is, the renewal work can be performed safely without stopping the operation of the power supply device.

  4 and 5 showing the concept of the retrofit circuit breaker, although not shown in detail, the circuit breaker body, the drawer frame, and the drawer operating device for moving the circuit breaker body within the drawer frame A retrofit circuit breaker 1 that uses a new three-phase circuit breaker having the above is housed in a drawer frame 2 of an existing circuit breaker. Upper and lower frame terminals 4 corresponding to the power supply side and the load side are attached to the drawer frame 2 via an insulator, and an existing bus bar 5 is connected to the conductor connection end of the frame terminal 4. Further, the retrofit circuit breaker 1 has a bridge-type contact that is attached to the wheel 3 for moving rightward when attached to the drawer frame 2 and the frame terminal 6 of the new circuit breaker via an attachment terminal 7. A device 8 is provided. The attachment terminal 7 is provided to make the contact device 8 face the contact end of the frame terminal 4.

  In order to attach such a retrofit circuit breaker to the drawer frame 2 of the existing circuit breaker, first, an existing circuit breaker body (not shown) is pulled to a disconnecting position using a drawing operation device (not shown). Remove from the circuit breaker drawer frame 2. And the existing frame side fixing block 9 for fixing the retrofit circuit breaker 1 is attached to the inside of the drawer frame 2 of the existing circuit breaker, and the contact device 8 contacts the frame terminal 4 with the retrofit circuit breaker 1. The retrofit circuit breaker-side fixing block 10 and the existing frame-side fixing block 9 that are attached to the outside of the drawer frame of the retrofit circuit breaker 1 in advance are fastened with screws 11. Even if a voltage is applied to the frame terminal 4 through the bus bar 5 during this work, there is no danger of an electric shock because the operator does not need to touch the frame terminal 4.

  Next, a conventional technique of the contact device described above will be described. 7 and 8 show a bridge-type contact device disclosed in Patent Document 1, which is used between a frame terminal and a main body terminal of a drawer type circuit breaker. As will be described later, the bridge-type contact device includes a main body terminal 51, a frame terminal 52, a pull-out contact 50 that bridge-contacts both of these terminals, and a contact spring 53 for obtaining contact pressure. In order to safely energize a larger current, it is necessary to use a contact spring 53 having a larger load. In order to insert the main body of such a circuit breaker into the drawer frame, In contrast, a larger insertion force is required. The invention of Patent Document 1 realizes reducing the insertion operation of such a circuit breaker.

7 and 8, the main body terminal 51 provided in the circuit breaker main body has upper and lower so that the drawing contacts 50 contacting the upper and lower surfaces of the main body terminal 51 and the frame terminal 52 face each other. Is provided. Each drawer contact 50 is rotatably held by a contact shaft 55 held by an arm portion of a shaft holding plate 54 mounted on the side surface of the main body terminal 51.
A contact stopper 56 formed in a U-shape with a shaft holding plate 54 having a mounting round hole and having a horizontal elongated hole 56a in both arms thereof is a step in which a male screw is formed at the tip end through which both holes are inserted. The attached bushing 57 is held by screwing it into the main body terminal 51, the shaft holding plate 54 is rotatable, and the contact stopper 56 is slidable in the left-right direction. The contact stopper 56 is urged rightward in FIG. 7 by a pulling spring 58 installed between the tip of the arm portion and the stepped bushing 57.

  A contact spring 53 is attached between the upper drawing contact 50 and the lower drawing contact 50 via a shaft 59 so that the facing distance between the two drawing contacts 50 is reduced. Both drawer contacts 50 have a main body side contact surface 50 a and a frame side contact surface 50 b formed in an arc shape, and the main body side contact surface 50 a is always in contact with the main body terminal 51. On the other hand, when the breaker body is in the disconnecting position, the contact stopper 56 is at the rightmost position, and the frame-side contact surface 50b of the upper and lower drawer contacts 50 connects the both arms of the contact stopper 56. The upper and lower edges of 56b are engaged with each other with a predetermined gap G1.

An operation when such a contact device is brought into contact with the frame terminal 52 will be described.
7 and 8, in the operation of inserting the circuit breaker body from the disconnection position to the connection position, the frame terminal 52 does not move, and the drawer contact 50 and the contact stopper 56 are moved to the right together with the body terminal 51. Move to. When the movement is started, the frame side contact surface 50b of the drawer contact 50 and the inclined surface 52a of the frame terminal 52 which are separated from each other before the movement come into contact with each other as shown in FIG. Then, the upper and lower frame-side contact surfaces 50b slide on the inclined surface 52a while expanding the facing distance against the contact spring 53, and further slide on the flat portion 52b to reach the connection position.

In this insertion process, when the facing distance between the upper and lower frame-side contact surfaces 50 b slightly increases, the connecting portion 56 b of the contact stopper 56 comes into contact with the tip of the frame terminal 52. When the insertion operation is further continued, the contact stopper 56 remains in that position, and the drawer contact 50 moves further to the right together with the main body terminal 51.
Further, since the facing gap G1 between the upper and lower frame side contact surfaces 50b is set to be slightly smaller than the thickness T1 of the frame terminal 52, the frame side contact surface 50b slightly slides on the inclined surface 52a of the frame terminal 52. Only by moving, the plane portion 52b is transferred, and a sufficient contact state can be easily obtained.

When the circuit breaker body is pulled out from the connection position, the contact stopper 56 continues to be stopped in a state where the connecting portion 56b is in contact with the distal end portion of the frame terminal 52 at the initial stage of the pull-out operation. Or the drawing contact 50 moves to the left. Then, before the contact between the frame-side contact surface 50b and the inclined surface 52a of the frame terminal 52 is eliminated, the upper and lower frame-side contact surfaces 50b sandwich the connecting portion 56b to form the facing gap G1, and the contact stopper 56 is It moves to the left with the drawing contact 50 and returns to the disconnected state.
Japanese Patent Laid-Open No. 2003-197084

The conventional contact device described above is used for connection between the frame terminal of the drawer type circuit breaker and the main body terminal, and can be repeatedly inserted and pulled out, for example, the breaker body is disconnected. A structure is employed in which the opposing gap G1 between the upper and lower frame-side contact surfaces 50b can be formed again when pulled out to the position. In order to achieve such a structure, it is necessary to increase the facing distance between the upper and lower frame-side contact surfaces 50b against the contact spring 53 during the insertion operation. Therefore, a special insertion that resists a large insertion operation force is required. A mechanism is needed.
On the other hand, the contact device attached to the circuit breaker for retrofit only connects with the frame terminal of the existing circuit breaker in the renewal work, and does not cancel the connection once connected. Therefore, even if it is possible to divert the conventional contact device as described above to the contact device of the circuit breaker for retrofit, there are problems that there are many unnecessary functions and the structure is too complicated.

  Therefore, according to the present invention, it is possible to easily connect a contactor device which is normally disconnected after being once connected, such as a contactor device used for a retrofit circuit breaker, with a simple configuration. The purpose is to.

  In order to solve the above problem, the invention of claim 1 is a contact surface that is rotatably provided on one terminal (7) of terminals (4, 7) arranged opposite to each other and is always in contact with the one terminal. (14a) provided at one end and when one terminal (7) of the opposing terminals moves in a direction in which both terminals approach each other, a contact surface that contacts the other terminal (4) of the opposing terminals ( 14b) at the other end, a bridge-shaped contact (14), a contact spring (16) that urges the contact to contact both one terminal and the other, and contact before movement A movable contact that has an engagement edge (17d) that locks the contact against the biasing force of the child spring, and that is displaced by being relatively pressed by the other terminal during the movement, thereby releasing the lock. A contact stopper device having a child stopper (17). Child stoppers are to having a engaging edge is not rotated against the contact springs contact to the terminals is connected completion state.

  According to a second aspect of the present invention, in the first aspect of the invention, the opposing terminals (4, 7) are both flat, and the contact (14) is in contact with the front and back sides of the opposing terminals. The engaging edge (17d) of the contact stopper is provided opposite to each other, and the facing distance (G2) on the contact surface (14b) at the other end of the opposing contact is greater than the thickness (T2) of the other terminal (4). It is supposed that it is formed to become.

  In the invention of claim 3, in the invention of claim 1 or 2, the other terminal (4) is a drawer frame (2) left by removing the breaker body of the existing drawer type circuit breaker installed on the switchboard. ), And one terminal (7) is a terminal of the retrofit circuit breaker (1) to be mounted instead of the removed circuit breaker body.

  According to the first aspect of the present invention, the contact edge of the contact stopper is formed so that the bridge-type contact does not rotate against the contact spring while one of the terminals is moving to connect the terminals arranged opposite to each other. Therefore, a large force for rotating the contact against the contact spring is not required in the connection work. As a result, there is a great effect that an apparatus having a complicated structure for the connection work is unnecessary and the connection work can be easily performed.

  According to a second aspect of the present invention, there is provided a contact device provided with bridge-type contacts facing each other so as to be in contact with both the front side and the back side of both flat plate-like terminals. Since the opposing distance at the other end of the contact is formed so as to be equal to or greater than the thickness of the other terminal, the contact is rotated so that the opposing distance is widened when the other terminal contacts the contact during movement. There is nothing. Moreover, since the contactor rotates according to the acting force of the contactor spring and comes into contact with the flat surface of the other terminal after the locked state is released, the effect described in the effect of the invention of claim 1 is achieved.

  The invention of claim 3 is advantageous in that the retrofit circuit breaker (1) can be easily mounted in the drawer frame of the existing drawer type circuit breaker.

  The best mode for carrying out the present invention will be described with reference to the embodiments shown in FIGS. This embodiment corresponds to the contact device 8 shown in FIGS. 4 and 5 which is a conceptual diagram of a circuit breaker for retrofit in the above-described background technology, and FIGS. The main part is shown. In the following description, members substantially the same as those in FIGS. 4 and 5 are denoted by the same reference numerals and description thereof is omitted.

  With reference to FIGS. 1 and 2, the attachment terminal 7 of the retrofit circuit breaker 1 is attached so that the right end face thereof faces the left end face of the frame terminal 4. Contact holders 12 are attached to the upper and lower surfaces of the attachment terminal 7, and a plurality of contacts 14 are rotatably attached to the respective contact holders 12 via contact shafts 13. A contact spring 16 is mounted via a spring shaft 15 between the upper contact 14 and the lower contact 14 facing each other, and the upper and lower contacts 14 are attached so that the facing distance between them is reduced. It is energized. In addition, since the contactor 14 is provided vertically symmetrically, the symbol in the figure is given either on the top or bottom.

  A main body side contact surface 14a, a frame side contact surface 14b, a main body side contact surface 14a, and a frame side contact surface 14b, both of which are formed in an arc shape at both ends thereof, on the surfaces of the upper and lower contacts 14 facing each other, A relief surface 14c and an engagement surface 14d, which are formed in a straight line parallel to the moving direction of the attachment terminal 7, are provided. The main body side contact surface 14 a is always in contact with the upper and lower surfaces of the attachment terminal 7. Further, the frame-side contact surface 14b is opposed to the frame terminal 4 with a facing interval G2 that satisfies G2 ≧ T2 in comparison with the thickness dimension T2 of the frame terminal 4 before the retrofit circuit breaker 1 is attached.

  In order to set the facing distance G2 of the frame side contact surface 14b, a U-shaped contact stopper 17 having both arms 17b and a connecting portion 17c for connecting both the arms 17b is provided. The contact stopper 17 is attached to the side surface of the attachment terminal 7 by a pin 18 so as to be slidable in the left-right direction in a long hole 17a formed in both arms 17b. The above-mentioned facing gap G2 is set by engaging the engaging surfaces 14d of the upper and lower contactors 14 with the upper and lower engaging edges 17d of the connecting portion 17c of the contactor stopper 17.

  The operation when the retrofit circuit breaker 1 having such a contact device 8 is attached to the drawer frame 2 of the existing circuit breaker will be described. With reference to FIGS. 1 and 2, when the retrofit circuit breaker 1 is moved in the right direction together with the contact device 8, the right surface of the connecting portion 17 c of the contact stopper 17 contacts the left end surface of the frame terminal 4. As the movement further continues, the contact stopper 17 stays at that position, the contact 14 moves further to the right together with the attachment terminal 7 and the like, and the engagement surfaces 14d of the upper and lower contacts 14 move upward and downward of the contact stopper 17. It slides on the engaging edge 17d. By this sliding, the engagement between the engagement surface 14d of the contact 14 and the engagement edge 17d of the contact stopper 17 is released. Since G2 ≧ T2 is maintained during the movement until the engagement is released, even if the engagement surface 14d of the contactor 14 and the frame terminal 4 are in contact with each other, the contactor spring 16 is resisted. The upper and lower contacts 14 are not rotated counterclockwise and clockwise, respectively, and the contact spring 16 acts only as a frictional force during sliding, so that the moving operation can be performed with a small force.

  When the engagement between the engagement surface 14d of the contact 14 and the engagement edge 17d of the contact stopper 17 is released, the upper and lower contacts 14 rotate clockwise and counterclockwise, respectively. The frame-side contact surface 14 b of the lower contact 14 contacts the upper and lower surfaces of the flat portion of the frame terminal 4 by the acting force of the contact spring 16. When the movement is further continued, the frame-side contact surface 14b slides on the flat portion of the frame terminal 4 and reaches the mounting position. During this sliding movement, the upper and lower contacts 14 do not rotate against the contact spring 16, and the contact spring 16 only acts as a frictional force during sliding. At the mounting position, a gap G3 is formed between the relief surface 14c of the contact 14 and the engaging edge 17d of the contact stopper 17, so that even if there is some dimensional variation, the contact 14 Contact with the frame terminal 4 is ensured.

  In the above-described mounting operation, when the connecting portion 17c of the contact stopper 17 comes into contact with the left end surface of the frame terminal 4, the screw 11 can be screwed into the existing frame side fixing block 9 as shown in FIG. It is in a state. When the engagement surface 14d of the contact 14 slides on the engagement edge 17d of the contact stopper 17, and when the frame-side contact surface 14b slides on the flat portion of the frame terminal 4, the upper and lower Since the operation of expanding the facing distance of the contact 14 does not occur, the acting force of the contact spring 16 acts only as a frictional force and does not require a large mounting force. Therefore, the retrofit circuit breaker 1 can be moved and attached to the drawer frame 2 by, for example, screwing the screw 11 into the existing frame side fixing block 9 without requiring a special operation device.

In the embodiment described above, a slide type is used as the contact stopper 17 for setting the facing distance G2 of the frame side contact surface 14b. However, the facing distance G2 is temporarily increased until the retrofit circuit breaker is attached. Can be maintained, and it is not a sliding type as long as it is designed so that a short circuit accident or the like will not occur due to dropping or displacement after the contact with the engaging surface 14d of the contactor 14 is released. Good.
Moreover, if the new circuit breaker of the retrofit circuit breaker is provided with a terminal corresponding to the terminal 6, the function as a drawer type is lost, but it does not necessarily have to be a drawer type.
Furthermore, the engagement surface 14d of the contact 14 on which the engagement edge 17d of the contact stopper 17 slides is formed in a straight line parallel to the movement direction of the attachment terminal 7, but during the entire movement process, the contact If it is considered that 14 does not rotate against the contact spring 16, it may have a shape that narrows the facing distance between the upper and lower contacts during sliding.
In addition, since the contact device of the above-described embodiment has a configuration used for the circuit breaker for retrofit, it is attached to the terminal on the moving side, that is, the attachment terminal 7. However, the contact device according to the present invention is not limited to being attached to the terminal on the moving side, and may be attached to the terminal on the fixed side. In this case, the terminal on the moving side presses and moves the contact stopper 17.

FIG. 7 is a side view showing an embodiment of the contact device according to the present invention before the retrofit circuit breaker is attached to the drawer frame of the existing circuit breaker, in order to explain the engagement edge 17d with the contact 14; It is the figure which fractured | ruptured a part of stopper 17. FIG. It is a top view of FIG. It is a figure equivalent to FIG. 1 after attaching the circuit breaker for retrofits to the drawer | drawing-out frame of the existing circuit breaker. It is a side view which shows the conceptual diagram of an example of the circuit breaker for retrofits. FIG. 5 is a plan view of FIG. 4. It is explanatory drawing when attaching the circuit breaker for retrofit which mounted | wore with the contactor apparatus of the Example of FIG. 1 to the existing drawer frame. It is a side view of the conventional contactor apparatus. FIG. 8 is a plan view of FIG. 7 with a part broken away.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Retrofit circuit breaker 2 Drawer frame of existing circuit breaker 3 Wheel 4 Frame terminal 5 Bus bar 6 Body terminal 7 Attachment terminal 8 Contact device 9 Existing frame side fixed block 10 Retrofit circuit breaker side fixed block 11 Screw 12 Contact Holder 13 Contactor shaft 14 Contactor 14a Main body side contact surface 14b Frame side contact surface 14c Relief surface 14d Engagement surface 15 Spring shaft 16 Contactor spring 17 Contactor stopper 17a Long hole 17b Both arms 17c Connecting portion 17d Engagement edge 18 Pin T2 Thickness dimension G2 of frame terminal 4 Opposite distance G3 between upper and lower frame-side contact surfaces 14b Gap between upper and lower linear relief surfaces 14c and engagement edge 17d

Claims (3)

One terminal (7) of the terminals (4, 7) arranged to face each other is provided with a contact surface (14a) that is rotatably in contact with the one terminal at one end, A bridge-type contactor provided with a contact surface (14b) at the other end that comes into contact with the other terminal (4) of the opposed terminals when any one of the terminals (7) moves in a direction in which the two terminals approach each other. (14) and
A contact spring (16) for biasing the contact so as to contact both the one terminal and the other terminal;
Before the movement, it has an engagement edge (17d) for locking the contact against the biasing force of the contact spring, and is displaced by being relatively pressed by the other terminal during the movement. A contactor device having a movable contact stopper (17) in which the locking is released,
The contact device, wherein the contact stopper has the engaging edge that does not rotate the contact against the contact spring until the both terminals are in a connected state.   The opposing terminals (4, 7) are both flat, and the contact (14) is provided so as to be in contact with the front side and the back side of the opposing terminals. The engaging edge (17d) is formed such that the facing distance (G2) on the contact surface (14b) at the other end of the opposing contact is equal to or greater than the thickness (T2) of the other terminal (4). The contact device according to claim 1, wherein: The other terminal (4) is a terminal attached in the drawer frame (2) left by removing the circuit breaker body of the existing drawer type circuit breaker installed on the switchboard, and the one terminal 3. The contact device according to claim 1, wherein (7) is a terminal of a retrofit circuit breaker (1) attached in place of the removed circuit breaker body.

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