JP2004014266A - Switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switch capable of improving in its reliability by simplifying a mechanism of a driving part and optimizing a constitution of each part, and reducing the cost. <P>SOLUTION: The mechanism composed of at least a spindle 16a, a driving arm 16b and a rod 16c is used as the driving part 16 for rotating and operating a movable contact 14, the rotation of the driving arm 16b is inhibited by being brought into contact with a rotation inhibitor at rotating positions respectively corresponding to an operating position and a releasing position of the movable contact 14, and the rotation of the spindle 16a is simultaneously restricted, whereby the over-rotation of the spindle 16a can be prevented by the driving arm 16b, that is, the driving arm 16b can also act as a stopper arm conventionally mounted on the spindle as an independent component, which reduces the number of components of the driving part 16, simplifies a structure of the driving part 16, reduces the cost, and improves the reliability. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a switch, and more particularly to an internal structure in which a driving mechanism of a movable contact is simplified.
[0002]
[Prior art]
Of the switches that open and close distribution lines, etc., the blade-type and butt-type methods have been generally used as the structure for opening or opening the movable contact with respect to the fixed contact inside the case. . In addition to fixed contacts and movable contacts, these conventional switches are connected to the case side wall to electrically connect each contactor to external conductors, handles and drives that operate the movable contacts. It consists of a mechanism.
[0003]
In such a conventional switch, an arc is generated between the stationary contact and the movable contact at the time of turning on and off, and each part is adversely affected. Therefore, various measures are taken to extinguish the generated arc as early as possible. Has been made. An example of such a conventional switch is shown in FIGS. FIG. 6 is a schematic cross-sectional view of a conventional switch, and FIG. 7 is a plan view and a front view of the main part of a drive unit in the conventional switch.
[0004]
In each of the drawings, a conventional switch 100 includes a metal case 101, bushings 102 and 103 supported through the case 101, a stationary contact 104 fixedly supported by one bushing 102, and the other. A blade-shaped movable contact 105 that is rotatably supported by the bushing 103 and can be inserted and released with respect to the fixed contact 104, and is formed of an insulating material and accommodates the fixed contact 104. The arc-extinguishing chamber portion 106 is supported, and a driving portion 107 that applies a driving force for rotating the movable contact 105.
The movable contact 105 can be inserted into and removed from the stationary contact 104 by being inserted and removed through the insertion port portion 106 a of the arc extinguishing chamber portion 106.
[0005]
The drive unit 107 prevents an over-rotation of the main shaft 108 that is pivotally supported on the upper portion of the case 101, a drive arm 109 that is projected in pairs of two on the main shaft 108, and the main shaft 108. One end is connected to the stopper arm 110 and the end of the drive arm 109 and the other end is connected to the movable contact 105, and the movable contact 105 is interlocked with the operation of the drive arm 109 to rotate a predetermined range. It is configured to include a rod 111 made of material and a drive mechanism (not shown) such as an electromagnet or a spring that generates a drive force for rotating the drive arm 109 in the insertion direction or the release direction of the movable contact 105.
[0006]
The main shaft 108 is rotated by a predetermined angle by the driving mechanism, and after the movable contact 105 reaches a predetermined opening or closing position via the driving arm 109 and the rod 111, the main shaft 108 tries to rotate further by inertia. The stopper arm 110 provided on the top hits a predetermined rotation restraining body to stop further rotation of the main shaft 108.
[0007]
The stopper arm 110 is disposed at a position slightly closer to the catch arm, which is a driving source for rotating the main shaft, from the axial center of the main shaft 108. That is, when the driving source for rotating the main shaft is at the shaft end, the rotating main shaft 108 is twisted at a position away from the shaft end, and the movable contact 105 of each phase enters the contact due to an impact when stopping the rotation. Since the size is likely to be shifted, the rotation is stopped at the center of gravity of the main shaft 108 so that the charged state of the movable contact 105 of each phase is equal.
[0008]
In the conventional switch 100 having the above configuration, when the movable contact 105 rotates in the opening direction with respect to the fixed contact 104, the movable contact with the fixed contact 104 is performed in the space inside the arc extinguishing chamber 106 (the arc extinguishing chamber). An arc is generated between the tip of the child 105. When this arc is generated, arc extinguishing gas is generated from the material of the inner wall of the arc extinguishing chamber 106 by arc heat, the arc extinguishing chamber pressure rises, and the movable contact 105 is pulled out of the arc extinguishing chamber at the same time. The arc extinguishing gas is blown out and the arc is extinguished.
[0009]
[Problems to be solved by the invention]
The conventional switch is configured as described above, and a stopper arm 110 that prevents over-rotation of the main shaft 108 is disposed on the main shaft 108 that constitutes the drive unit 107, and the movable contact 105 is operated. Since the drive arms 109 are arranged in pairs for each phase and are respectively attached to the main shaft 108 by welding, there is a problem that the number of welding steps of the main shaft 108 is large and manufacturing takes time. In addition, since the corresponding driving arm 109 and the movable contact 105 are connected by a single rod 111, it is necessary to use a strong and reliable material for the rod 111 to which the driving force is applied, thereby reducing the cost. In addition, since the end portion of the rod 111 is inserted and assembled between two members of the drive arm 109, the assembly work such as insertion of a pin into the hole of the drive arm 109 is troublesome.
[0010]
The present invention has been made to solve the above-described problems, and an object thereof is to provide a switch capable of improving the reliability and reducing the cost by optimizing the configuration of each part, such as by simplifying the mechanism of the driving part. To do.
[0011]
[Means for Solving the Problems]
The switch according to the present invention includes a pair or a plurality of pairs of bushings that pass through the case and are supported in a state of being opposed to each other in the case, and a fixed contact that is fixedly supported by a conductive portion of one of the opposed bushings. A movable contact that is rotatably supported by the conductive portion of the other bushing and can be inserted into and released from the fixed contact, and a small portion that serves as a receiving portion of the fixed contact and a passage for the movable contact. In a switch comprising an arc extinguishing chamber having a gap-like internal space and supported by the one bushing, and a driving unit for applying a driving force for rotating the movable contact, the driving unit includes the A main shaft rotatably disposed in the case, one or a plurality of projecting protrusions corresponding to each of the movable contacts on the main shaft, and a drive arm that rotates integrally with the main shaft; One end is connected, and At least a rod having the other end connected to a predetermined portion of the movable contact, the movable contact being rotatable within a predetermined range in conjunction with the rotation of the main shaft, and the drive arm is configured to move the movable contact It can be brought into contact with a predetermined rotation restraining body at rotational positions respectively corresponding to the child insertion position and the open position, and the rotational range is limited.
[0012]
As described above, in the present invention, a mechanism including at least a main shaft, a drive arm, and a rod is used as a drive unit for rotating the movable contact, and the drive arm rotates corresponding to the insertion position and the release position of the movable contact, respectively. The rotation range is limited by contacting the rotation restraining body at the position, and at the same time, the rotation of the main shaft is also limited, so that the main shaft can be prevented from rotating too much by the driving arm, and the driving arm is a separate component on the conventional main shaft. The function of the stopper arm can also be reduced, so that the number of parts constituting the drive unit can be reduced, the structure of the drive unit can be simplified, the cost can be reduced, and the reliability can be improved.
[0013]
Further, in the switch according to the present invention, if necessary, the drive arm and the movable contact are arranged so that the respective rotation center axes are parallel, and the rod is a substantially plate-like shape made of an insulating material. The drive arm or the movable contact is connected to each other with the drive arm or the movable contact being sandwiched between the ends of the two substantially plate-like bodies that are formed to face each other. In this way, in the present invention, the rods are formed as a pair of substantially plate-like bodies, and are connected and arranged with the drive arm or the movable contact being sandwiched therebetween, and the two substantially plate-like bodies are arranged. By transmitting the driving force from the driving arm to the movable contact, it is possible to share the applied force evenly. Even if a relatively low strength material is used, sufficient strength can be secured with two, reducing the cost of the rod. In addition to improving reliability, the connecting structure between the drive arm and the movable contact is simplified, and assembly is facilitated.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS. 1 is a front view and a side view of a switch according to the present embodiment, FIG. 2 is a schematic internal configuration diagram of the switch according to the present embodiment, and FIG. 3 is a diagram of a case main body in the switch according to the present embodiment. FIG. 4 is a plan view and a front view of the main part of the drive unit in the switch according to the present embodiment. FIG. 5 is a front view of the pointer part in the switch according to the present embodiment. It is a rear view of a part notch side view and a pointer.
[0015]
In each of the drawings, the switch 1 according to the present embodiment includes a metal case 10, a plurality of pairs of bushings 11, 12 disposed so as to penetrate the side wall of the case 10, and the conductivity of one bushing 11. A fixed contact 13 fixedly supported by the portion 11a, a movable contact 14 supported rotatably by the conductive portion 12a of the other bushing 12, and capable of being inserted into and released from the fixed contact 13, and a fixed An arc extinguishing chamber portion 15 made of an insulating material that covers the contact 13 and is supported by the bushing 11, a drive portion 16 that gives a drive force for rotating the movable contact 14, and a state in which the movable contact 14 is put in and released Is provided with a pointer portion 17 that can be confirmed outside the case 10.
[0016]
The bushings 11 and 12, the stationary contact 13, the movable contact 14, and the arc extinguishing chamber 15 are arranged in three cases in the case 10 according to the three-phase distribution line.
[0017]
The case 10 has a combination structure of a case main body 10a and a lid 10b, and has a mechanism for ensuring airtightness by interposing a packing (not shown) between both parts. The case body 10a is provided with a packing groove 10c for receiving packing (see FIG. 3). The packing groove 10c is formed by drawing, and it is possible to reliably ensure airtightness by eliminating the welded portion from the groove without using an assembly structure by welding similar to that in the past, which has a high risk of causing airtight defects. In addition, a plurality of holes 10d are formed in the side wall of the packing groove 10c, and a convex portion is formed at each position on the packing side surface corresponding to the hole 10d, and the convex portion of the packing is fitted into the hole 10d. By doing so, it can be fixed and positioned in the packing groove 10c without adhering the packing, and it is easy to attach / detach the packing, correct the position, etc., and is excellent in workability.
[0018]
The bushings 11 and 12 are arranged in a state of passing through the side wall of the case 10 and facing each other in the case 10, and connect the distribution line (not shown) to the fixed contact 13 or the movable contact 14. This is a known configuration having the conductive portions 11a and 12a as conductors, and detailed description thereof is omitted.
The fixed contact 13 and the movable contact 14 have a known configuration of a mechanism for inserting and removing the blade-shaped movable contact with the fixed contact, and detailed description thereof is omitted.
[0019]
The arc-extinguishing chamber portion 15 is formed of an insulating material such as polyacetal resin, and has a shape having a slit-like internal space (arc-extinguishing chamber) serving as a passage for the stationary contact 13 and the movable contact 14. In this configuration, the fixed contact 13 is surrounded and accommodated in the bushing 11 at the tip.
The arc extinguishing chamber 15 has a combination structure of an arc extinguishing chamber main body 15 a that surrounds the arc extinguishing chamber and half of the stationary contact 13 and an arc extinguishing chamber cover 15 b that encloses the remaining half of the stationary contact 13. If the conductive portion 11a of the bushing 11 to which the fixed contact 13 is attached is sandwiched between the arc extinguishing chamber portion main body 15a and the arc extinguishing chamber cover 15b and are fixed to each other, it can be integrated easily, and assembly workability is improved. Excellent.
[0020]
The drive unit 16 has a main shaft 16a pivotally supported on the upper part of the case 10, a drive arm 16b disposed in a protruding state on the main shaft 16a, and one end connected to the end of the drive arm 16b. In addition, the other end is connected to the movable contact 14, and the rod 16c made of an insulating material is rotated by a predetermined range in conjunction with the operation of the drive arm 16b. The drive arm 16b is connected to the movable contact 14. It is a structure provided with well-known drive mechanisms (illustration omitted), such as an electromagnet and a spring which generate | occur | produces the drive force rotated in an injection | throwing-in direction or an open direction.
[0021]
Three drive arms 16b are arranged on the main shaft 16a so as to correspond to the movable contacts 14 of each phase, and are rotatably connected to one end of the rod 16c. The drive arm 16b comes into contact with a predetermined rotation restraining body (not shown) at a position where the rotation of the main shaft 16a is to be stopped, and is prevented from further rotation in the rotation direction. It plays the same role as the conventional stopper arm to prevent. In this way, the drive arm 16b also serves as a stopper arm, which is a separate part on the main spindle 16a, thereby reducing the number of parts constituting the drive unit 16 and simplifying the structure. Further, one drive arm 16b is attached to the main shaft 16a for each phase, so that the number of welding steps can be reduced as compared to the conventional two.
[0022]
The rod 16c is a substantially plate-like body made of a long and thin insulating material, and one end of the rod 16c is connected to the tip of the drive arm 16b, and the connection is separated from the rotation center of the movable contact 14 by a predetermined dimension. The other end is connected to the working part, and two substantially plate-like bodies are assembled in a state of sandwiching one drive arm 16b and the movable contact 14, so that the applied force can be equally shared. Even if a low-strength material is used, sufficient strength can be secured with two materials, and assembly can be easily performed.
[0023]
The pointer part 17 links the pointer 17a and the drive part 16 in the case 10 through the side wall of the case 10 and the pointer 17a indicating the input or opened state of the movable contact 14 by the indicated position outside the case 10. The pointer shaft 17b is provided, and the interlocking mechanism with the drive unit 16 in the case 10 is a known configuration, and detailed description thereof is omitted. As shown in FIGS. 5 (B) and 5 (C), teeth that can be engaged with each other by providing grooves at equal intervals on the peripheral surfaces of the mating portions where the pointer 17a and the pointer shaft 17b are integrated. Regardless of the mounting state of the pointer shaft 17b, the mounting angle of the pointer 17a with respect to the pointer shaft 17b can be easily adjusted by changing the mutual fitting position.
[0024]
Next, the opening operation in the switch according to the present embodiment will be described. When the movable contact 14 rotates in the opening direction (away direction) with respect to the fixed contact 13, an arc is generated between the fixed contact 13 and the tip of the movable contact 14. As the movable contactor 14 rotates, arc extinguishing gas is generated from the inner wall of the arc extinguishing chamber part 15 by the heat of the arc in the process of the distal end of the movable contactor 14 passing through the arc extinguishing chamber in the arc extinguishing chamber part 15. When the movable contact 14 is further rotated, the arc extinguishing gas whose internal pressure is increased blows out from the arc extinguishing chamber at the moment when the movable contact 14 comes out of the arc extinguishing chamber 15, thereby reliably extinguishing the arc. Be made.
[0025]
As described above, in the switch according to the present embodiment, a mechanism including at least the main shaft 16a, the drive arm 16b, and the rod 16c is used as the drive unit 16, and the drive arm 16b is placed in the open position and the open position of the movable contact 14. Since the rotation range is restricted by contacting the rotation restraining body at the corresponding rotational positions, and the rotation of the main shaft 16a is also restricted at the same time, the drive arm 16b also serves as a stopper arm, which has been a separate part of the prior art. The number of parts constituting the drive unit 16 can be reduced, the structure of the drive unit 16 can be simplified, and the cost can be reduced. Further, the rod 16c is formed as a pair of substantially plate-like bodies, and is connected to and arranged with the drive arm 16b or the movable contact 14 interposed therebetween, and the drive arm 16b is constituted by two substantially plate-like bodies. Since the driving force is transmitted from the first to the movable contact 14, the applied force can be equally shared, and sufficient strength can be ensured even with a relatively low strength material, and the cost of the rod 16 c can be reduced. In addition to the improvement in reliability, the connection structure between the drive arm 16b and the movable contact 14 is simplified, and assembly is facilitated.
[0026]
【The invention's effect】
As described above, according to the present invention, a mechanism comprising at least a main shaft, a drive arm, and a rod is used as a drive unit for rotating the movable contact, and the drive arm corresponds to the loading position and the release position of the movable contact, respectively. The rotation range is limited by contacting the rotation restraining body at the rotating position, and the rotation of the main shaft is also restricted at the same time, so that the driving arm can prevent the main shaft from rotating too much. Thus, the number of parts constituting the drive unit can be reduced by serving also as the stopper arm, and the structure of the drive unit can be simplified to reduce the cost and increase the reliability.
[0027]
Further, according to the present invention, the rods are formed as a pair of substantially plate-like bodies, arranged to be connected to each other with the drive arm or the movable contact being sandwiched therebetween, and the two substantially plate-like bodies are provided. By transmitting the driving force from the driving arm to the movable contact, it is possible to share the applied force evenly. Even if a relatively low strength material is used, sufficient strength can be secured with two, reducing the cost of the rod. In addition to the improvement of reliability, the connection structure between the drive arm and the movable contact is simplified, and the assembly can be easily performed.
[Brief description of the drawings]
FIG. 1 is a front view and a right side view of a switch according to an embodiment of the present invention.
FIG. 2 is a schematic internal configuration diagram of a switch according to an embodiment of the present invention.
FIGS. 3A and 3B are a front view and a bottom view of main parts of a case body in a switch according to an embodiment of the present invention. FIGS.
FIGS. 4A and 4B are a plan view and a front view of main parts of a drive unit in a switch according to an embodiment of the present invention. FIGS.
FIG. 5 is a front view, a partially cutaway side view, and a rear view of the pointer in the switch according to the embodiment of the present invention.
FIG. 6 is a schematic sectional view of a conventional switch.
FIGS. 7A and 7B are a plan view and a front view of a main part of a driving unit in a conventional switch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,100 Switch 10, 101 Case 10a Case main body 10b Cover 10c Packing groove 10d Hole 11, 12 Bushing 11a, 12a Conductive part 13, 104 Fixed contact 14, 105 Movable contact 15, 106 Arc extinguishing chamber 15a Arc extinguishing Chamber main body 15b Arc extinguishing chamber cover 16, 107 Drive unit 16a, 108 Main shaft 16b, 109 Drive arm 16c, 111 Rod 17 Pointer unit 17a Pointer 17b Pointer shaft 102, 103 Bushing 106a Insert port 110 Stopper arm

Claims (2)

A pair or a plurality of pairs of bushings that pass through the case and are supported in a state of being opposed to each other in the case, a fixed contact that is fixedly supported by the conductive part of one of the opposite bushings, and a conductive part of the other bushing A movable contact that is rotatably supported and can be inserted into and released from the fixed contact, and a slit-shaped internal space that serves as a receiving portion of the fixed contact and a passage for the movable contact. In a switch comprising an arc extinguishing chamber supported by the one bushing and a driving unit for applying a driving force for rotating the movable contact,
A main shaft that is rotatably disposed in the case, and one or a plurality of driving arms corresponding to each of the movable contacts on the main shaft, and a driving arm that rotates integrally with the main shaft. And a rod having one end connected to the drive arm and the other end connected to a predetermined portion of the movable contact, and the movable contact is moved to a predetermined range in conjunction with rotation of the main shaft. It can be rotated,
The switch, wherein the drive arm can be brought into contact with a predetermined rotation deterrence member at a rotation position corresponding to a loading position and an opening position of the movable contact, and a rotation range is limited. The switch according to claim 1,
The drive arm and the movable contact are arranged such that each rotation center axis is parallel,
The rod is formed of a pair of substantially plate-like bodies made of insulating material, and is driven with the drive arm or movable contact being sandwiched between the ends of the two substantially plate-like bodies arranged opposite to each other. A switch connected to an arm and a movable contact.

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