JP2011171239A - Switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a switch which can prevent a shortage of grease at a slide contact part formed on a support part of a movable contact. <P>SOLUTION: The switch includes: a fixed contact; and the movable contact 4 which is rotatably supported by a support conductor 3 through a shaft member 5, and is rotated and displaced between an input position which is a state of contacting with the fixed contact and an open position which is a state of separating from the fixed contact. A slide contact surface of the support conductor 3 and a slide contact surface of the movable contact 4 are made in slide-contact in a peripheral part of the shaft member 5 and are biased by a contact pressure spring, and grease is applied between both of the slide contact surfaces. Many recesses 11 for forming grease sumps are formed in a scattered state on at least one of the slide contact surface of the movable contact 4 and the slide contact surface of the support conductor 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power switch suitable for use as a section switch or the like provided in a power distribution system.

  As a power switch, a movable contact supported so that it can rotate between a fixed contact, a closing position in contact with the fixed contact, and an open position in a state away from the fixed contact What consists of a contactor is known. A movable contact used in this type of switch is supported by a support conductor fixed to an insulator so as to be rotatable through a shaft, as shown in Patent Document 1, for example. The mechanism is operated to rotate between the closing position and the open position.

  FIG. 4 shows a movable unit 1 ′ of the switch shown in Patent Document 1. In FIG. 4, reference numeral 2 denotes a base end portion 2a fixed to a frame (not shown) of the switch. An insulator 3 'is a support conductor fixed to the tip 2b of the insulator 2, and 4 is a movable contact that is rotatably supported by the support conductor 3' via a shaft member 5.

  The movable contact 4 and the support conductor 3 'have sliding contact surfaces that are in sliding contact with each other at the periphery of the shaft member 5, and the sliding contact surface of the movable contact 4 and the support conductor 3' slide. The contact surfaces are arranged in contact with each other. Although not shown in FIG. 4, a contact pressure spring that urges the sliding contact surface of the movable contact 4 and the sliding contact surface of the support conductor 3 ′ to contact with a predetermined pressure is provided on the shaft member 5. Is attached. The movable contact 4 is connected to one external terminal of the switch through a support conductor 3 'and a connection conductor 15 electrically connected to the support conductor 3'.

  Conductive grease is applied to the sliding contact surface of the movable contact 4 and the sliding contact surface of the support conductor 3 ′, whereby the sliding resistance of the movable contact 4 is reduced.

  Although not shown, a fixed side unit having a fixed contact supported by an insulator is disposed on the side of the movable contact unit 1 ′, and the fixed contact is electrically connected to the other external terminal of the switch. Connected to. The movable contact 4 is rotationally displaced between an input position where the movable contact 4 is in contact with the fixed contact and an open position where the movable contact 4 is separated from the fixed contact. FIG. 4 shows a state in which the movable contact 4 is arranged at the closing position. When the switch is opened, the movable contact 4 is rotated counterclockwise in FIG. 4 and displaced to the position indicated by the chain line in the figure.

JP 2009-43631 A

  In the switch provided with the movable unit 1 'shown in FIG. 4, the contact pressure is such that the sliding contact surface of the movable contact 4 and the sliding contact surface of the support conductor 3' are in contact with each other with sufficient contact pressure. Since the sliding contact surface of the movable contact 4 is strongly biased against the sliding contact surface of the support conductor 3 ′ by the spring, when the opening / closing operation is repeated, the sliding contact surface of the movable contact 4 The grease applied to the sliding contact surface of the support conductor 3 ′ is peeled off by the movement of the movable contact 4, and the grease comes out of the sliding contact surface as indicated by reference numeral G in FIG. 4. . When such a state occurs, the grease that is interposed between the sliding contact surface of the movable contact 4 and the sliding contact surface of the support conductor 3 ′ is in a state of lack of grease. There is a problem that the sliding resistance of the sliding contact portion with the conductor is increased, and the operability of the movable contact is impaired.

  In order to reduce the sliding resistance, it is conceivable to adjust the biasing force of the contact pressure spring so as to weaken the contact pressure between the sliding contact surface of the movable contact 4 and the sliding contact surface of the support conductor 3 '. However, if the contact pressure between the sliding contact surface of the movable contact 4 and the sliding contact surface of the support conductor 3 ′ is weakened, the electrical contact resistance between the movable contact and the support conductor increases, The current-carrying performance between the contact and the support conductor is hindered.

  The object of the present invention is to prevent the occurrence of a grease breakage at the sliding contact portion between the movable contact and the support conductor without impairing the current-carrying performance between the movable contact and the support conductor. Another object of the present invention is to provide a switch that keeps the sliding resistance between the movable contact and the support conductor low and allows the movable contact to be operated smoothly.

  A switch that is a subject of the present invention is a fixed contact, a loading position that is rotatably supported by a support conductor via a shaft member and is in contact with the fixed contact, and is separated from the fixed contact A movable contact that can be rotationally displaced between the open circuit position to be in a state, and the sliding contact surface of the support conductor and the sliding contact surface of the movable contact are brought into sliding contact at the periphery of the shaft member. ing. The sliding contact surface of the movable contact is biased by a contact pressure spring so as to contact the sliding contact surface of the support conductor with a predetermined contact pressure. In order to smoothly rotate the movable contact, grease is applied between the sliding contact surface of the movable contact and the sliding contact surface of the support conductor.

  In the present invention, at least one of the sliding contact surface of the movable contact and the sliding contact surface of the support conductor is provided in a state where a large number of recesses constituting a grease reservoir are scattered, and the sliding contact surface provided with recesses The size and number of the recesses are set so that the area of the portion other than the recesses is as large as necessary to keep the electrical contact resistance between the movable contact and the support conductor below the specified value. Yes.

  As described above, when a large number of recesses constituting a grease reservoir are provided in at least one of the sliding contact surface of the movable contact and the sliding contact surface of the support conductor, the grease can be held in each recess. Therefore, it is possible to prevent the grease from being peeled off by the movable contact, and to prevent the state of the grease from being cut off at the sliding contact portion between the movable contact and the support conductor.

  According to the present invention, a large number of recesses constituting a grease reservoir are provided in at least one of the sliding contact surface of the movable contact and the sliding contact surface of the support conductor, and the grease is held in each recess. Further, it is possible to prevent the grease from being peeled off by the movable contact, and to prevent the grease from being cut off at the sliding contact portion between the movable contact and the support conductor. Therefore, according to the present invention, the sliding contact between the movable contact and the support conductor can be kept low for a long period of time, and the movable contact can be operated smoothly.

It is the front view which showed the unit of the movable side of the switch concerning one Embodiment of this invention. It is the left view which cut and showed a part of FIG. It is the left view which showed the state which removed the movable contact from the movable side unit of FIG. It is the front view which showed the unit of the movable side of the conventional switch.

  1 to 3 show a movable unit 1 of a switch according to an embodiment of the present invention. 1 and 2, reference numeral 2 denotes an insulator in which a base end portion 2a is fixed to a frame (not shown), and 3 denotes a plate-like base portion 301 and an upright plate portion 302 that rises at a right angle from the end portion of the base portion 301. The L-shaped support conductor 4 has a letter-shaped movable contact supported by the support conductor 3 via a shaft member 5 so as to be rotatable.

  The support conductor 3 is disposed in a state in which the base portion 301 is overlapped on the end surface of the distal end portion 2b of the insulator 2, and the bolt 6 penetrating the base portion 301 is screwed into a metal fitting embedded in the insulator 2, thereby supporting the support conductor 3 3 is fastened to the insulator 2.

  The movable contact 4 includes a first portion 401 whose base end portion 401a is rotatably supported by the standing plate portion 302 of the support conductor 3 via the shaft member 5, and a bolt and a tip at the tip of the first portion 401. It consists of a V-shaped second portion 402 having one end fastened by a fastening means 7 made of a nut, and a contact portion 403 is formed at the other end of the second portion 402.

  The base end portion 401a of the first portion 401 of the movable contact 4 and the upright plate portion 302 of the support conductor 3 are formed with sliding contact surfaces that are in sliding contact with each other. The sliding contact surface of the portion 401 and the sliding contact surface of the upright plate portion 302 of the support conductor 3 are arranged in contact with each other.

  The base end portion 401a of the first portion 401 of the movable contact 4 is formed with a groove portion 4a into which the tip of the upright plate portion 302 of the support conductor 3 is inserted, and the upright plate portion 302 of the support conductor 3 is formed into the groove portion 4a. Has been inserted inside. The shaft member 5 that supports the movable contact 4 includes one of a pair of plate-like portions 401a1 and 401a2 that are opposed to each other via the groove 4a of the base end portion 401a of the movable contact 4, and an upright plate portion of the support conductor. 302 is provided in a state of penetrating through a portion inserted into the groove 4a.

  As shown in FIG. 2, a flange 5 a is formed at one end of the shaft member 5, and the other end of the shaft member 5 is a pair of plate-like portions 401 a 1 and 401 a 2 of the base end portion 401 a of the movable contact 4. Is in contact with the inner surface of the other 401a2. A contact pressure spring 8 including a compression spring is disposed between the flange portion 5 a of the shaft member 5 and the base end portion 401 a of the movable contact 4. A female screw part is formed in the shaft core part of the other end of the shaft member 5, and the shaft member 5 is fastened to the plate-like part 401a2 by a bolt 9 that passes through the plate-like part 401a2 and is screwed into the female screw part. ing. The plate-like portion 401 a 1 of the base end portion 401 a of the movable contact 4 is biased toward the upright plate portion 302 side of the support conductor 3 by the contact pressure spring 8.

  A hole 401b1 is formed by penetrating a tongue-like protrusion 401b provided in an intermediate portion of the first portion 401 of the movable contact 4, and an operation lever of an operation mechanism (not shown) is pinned using this hole 401b1. It is connected to the movable contact 4 via the.

  The base end portion 401 a of the movable contact 4 and the upright plate portion 302 of the support conductor 3 have sliding contact surfaces that are in sliding contact with each other on the periphery of the shaft member 5, and the sliding contact surface of the movable contact 4. (Not shown) and a sliding contact surface 302 a of the upright plate portion 302 of the support conductor 3 are brought into sliding contact with a predetermined pressure by the biasing force of the contact pressure spring 8.

  In the present embodiment, a large number of recesses 11 (see FIG. 3) that constitute a grease reservoir are provided in a scattered state on the sliding contact surface 302 a of the upright plate portion 302 of the support conductor 3. In order to reduce the sliding resistance of the sliding contact portion between the movable contact 4 and the support conductor 3, the sliding contact surface at the base end portion of the movable contact 4 and the sliding of the upright plate portion 302 of the support conductor 3. The contact surface 302a is coated with conductive grease. In the present invention, in order to keep the area of the portion other than the depression 11 on the sliding contact surface where the depression 11 is provided, the electrical contact resistance between the movable contact 4 and the support conductor 3 is below a specified value. The size and number of the depressions 11 are set so as to have a necessary size. Each recess 11 provided in the present embodiment is formed such that the contour shape of the opening thereof is circular.

  Reference numeral 15 denotes a connection conductor having a base portion 15a and a rising portion 15b rising at right angles from the end portion of the base portion 15a. The connection conductor is formed between the base portion 301 of the support conductor 3 and the tip portion 2b of the insulator 2 between the base portion 15a. It is supported by the insulator 2 in a state of being sandwiched between and electrically connected to the support conductor 3. The connection conductor 15 is used for electrically connecting the support conductor 3 to the external terminal of the switch.

  1 to 3, reference numeral 16 denotes a shield conductor that is fixed to the insulator 2 and covers the vicinity of the base portion 301 of the support conductor 3.

  Although not shown, on the side of the movable contact unit 1 (on the right side in FIG. 1), a fixed side unit having a fixed contact supported by an insulator is disposed. A switch is constituted by the unit 1. The fixed contact is electrically connected to the other external terminal of the switch. The movable contact 4 is rotationally displaced between an input position where the movable contact 4 is in contact with the fixed contact and an open position where the movable contact 4 is separated from the fixed contact. FIG. 1 shows a state in which the movable contact 4 is arranged at the closing position. When the switch is opened, the movable contact 4 is rotated counterclockwise in FIG. 1 and displaced to the position indicated by the chain line in the drawing.

  As described above, if a large number of recesses 11 constituting a grease reservoir are provided on at least one of the sliding contact surfaces of the support conductor 3, the grease can be held in each recess 11. It is possible to prevent the grease from being peeled off from the manual contact surface with the movement, and to prevent the grease from being cut off at the sliding contact portion between the movable contact 4 and the support conductor 3. Therefore, the movable contact can be smoothly operated while keeping the sliding resistance between the movable contact 4 and the support conductor 3 low over a long period of time.

  In the above embodiment, the depression 11 is provided on the sliding contact surface 302a of the support conductor 3, but the depression constituting the grease reservoir may be provided on the sliding contact surface on the base end portion 402 side of the movable contact 4. In addition, a recess constituting a grease reservoir may be provided on both the sliding contact surface 302a of the support conductor 3 and the sliding contact surface on the base end portion 402 side of the movable contact 4. In any case, the area of the part other than the dent of the sliding contact surface provided with the dent (the part that contacts the other sliding contact surface via the grease) is the electric area between the movable contact and the support conductor. The size and the number of the depressions are set so that the necessary contact resistance is kept below a specified value.

  In the above embodiment, the outline of the opening of the depression 11 is formed in a circular shape, but the outline shape of the opening of the depression 11 is arbitrary.

  In the above embodiment, the movable contact 4 is configured to have a letter shape, but the movable contact 4 of the switch targeted by the present invention is rotatably supported by the support conductor, What is necessary is just to have the sliding contact surface which carries out sliding contact with the support conductor, and it is not limited to what is comprised in a square shape.

DESCRIPTION OF SYMBOLS 1 Movable side unit of switch 2 Insulator 3 Support conductor 301 Base 302 Standing plate 302a Sliding contact surface of support conductor 4 Movable contact 4a Groove 401 First part 401a Base end of movable contact 402 Second Part 403 Contact part 5 Shaft member 5a collar part 8 Contact pressure spring 9 Bolt 15 Connection conductor 16 Shield conductor

Claims (1)

Rotating between the fixed contact and the open position where the fixed contact is supported by the support conductor via the shaft member and is in contact with the fixed contact, and the open position where the contact is away from the fixed contact. A movable contact that can be moved and displaced, and the sliding contact surface of the support conductor and the sliding contact surface of the movable contact are in sliding contact with each other at the periphery of the shaft member, The sliding contact surface is urged by a contact pressure spring so that the sliding contact surface contacts the sliding contact surface of the support conductor at a predetermined contact pressure, and the sliding contact surface of the movable contact and the sliding contact surface of the support conductor In the switch where grease is given between
Provided in a state where a large number of depressions constituting a grease reservoir are scattered on at least one of the sliding contact surface of the movable contact and the sliding contact surface of the support conductor;
The area of the portion other than the depression of the sliding contact surface provided with the depression is set to a size necessary for keeping the electrical contact resistance between the movable contact and the support conductor below a specified value. The size and number of the depressions are set,
A switch characterized by.

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