JP5519713B2 - AC contactor operating device - Google Patents

Description

  The present invention relates to an operation device for an AC contactor, and in particular, uses an electromagnetic force to open and close a breaker of a switch, for example, used for connecting and opening an AC power supply device for a railway and a main transformer. In particular, the present invention relates to an operating device for an AC contactor.

  The AC contactor is mainly used for the connection and opening of the AC power supply and the main transformer for railways. Normally, the circuit is opened and closed, and when the fault current is cut off, the power supply side is cut off by the circuit breaker. In conjunction with this, it plays the role of blocking the circuit.

  The operating device that uses electromagnetic force to open and close the breaker in this AC contactor is turned on when an operation signal is input in an open state, and is turned on when the operation signal is continuously input. It is required that the contact be opened in a state where the operation signal is held and interrupted.

  Such an AC contactor operating device often employs an electromagnetic operating device using an electromagnet, and in particular, an electromagnetic operating device using a permanent magnet has been proposed (see, for example, Patent Document 1).

JP 2010-519776

  However, as described above, the AC contactor operating device continues to be turned on and held in a state where the operation signal is continuously input. Therefore, in the operating device using an electromagnet, the coil is excited in the turned on and held state. As a result, current will continue to flow.

  Therefore, it is an important point how to reduce the coil excitation current at this time to suppress power consumption. In addition, in order to keep exciting at all times, it is necessary to consider how to suppress the heat generated by the electromagnet at that time to radiate heat.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an operating device for an AC contactor with low power consumption, a simple structure, and high safety and reliability.

  In order to achieve the above object, an operating device for an electromagnetic contactor according to the present invention includes a blocking portion, an operating device that opens and closes the blocking portion, a link mechanism that transmits the operation of the operating device to the blocking portion, The operating device includes a movable plunger and a fixed plunger arranged opposite to each other, a coil that separates or contacts the movable plunger and the fixed plunger according to electromagnetic force, and a periphery of the coil. An electromagnet having a first cover and a support plate that covers and forms a path of magnetic flux generated from the coil; and a permanent magnet that generates an electromagnetic force for maintaining a contact state between the movable plunger and the fixed plunger; An operating device for an AC contactor comprising: a shaft coupled to the movable plunger and transmitting an electromagnetic force generated from the electromagnet to the blocking portion via the link mechanism The fixed plunger is composed of an open position fixed plunger arranged above the movable plunger and a closing position fixed plunger arranged below, and the permanent magnet is below the open position fixed plunger, Located above the closing position fixing plunger and disposed on the first support plate around the movable plunger, the coil includes a closing coil disposed around the closing position fixing plunger and the coil It consists of a closing position fixing plunger and a closing holding coil disposed across the open position fixing plunger.

  In addition to the above-described configuration, the AC contactor operating device according to the present invention is arranged such that the shaft is arranged along the vertical direction at the center of the electromagnet, and the upper side thereof is a through hole of the first support plate. The lower side is inserted into the through hole of the second support plate so as to be movable up and down, and one end of the shaft is connected to the link mechanism, and the movable plunger is fixed to the outer peripheral surface of the shaft. It is characterized by.

  In addition to the above configuration, the AC contactor operating device according to the present invention is characterized in that the movable plunger moves between the open position fixed plunger and the closing position fixed plunger together with the shaft.

  In addition to the above-described configuration, the AC contactor operating device of the present invention is configured such that when the electromagnet is opened, the open position fixed plunger and the movable plunger are in contact, and when the electromagnet is turned on, the input position fixed plunger and the movable plunger are in contact. Are in contact with each other.

  In the AC contactor operating device according to the present invention, in addition to the above configuration, a fixed member that fixes the movable plunger to the outer peripheral surface of the shaft interferes with the closing position of the charging position fixed plunger on the side facing the movable plunger. It is characterized in that a counterbore is not formed.

  In addition to the above-described configuration, the AC contactor operating device of the present invention includes a second cover and a third support plate that form a path of magnetic flux generated from the permanent magnet around the open circuit position fixing plunger. The electromagnet is covered with the second cover and the third support plate, and the opening position fixing plunger is covered with the first cover and the support plate; It is characterized by being formed in a convex shape that protrudes upward in the vertical direction from the charging and holding coil.

  In addition to the above configuration, the operating device for the AC contactor according to the present invention includes the making coil and the making and holding coil housed in a coil bobbin, and a rubber made between the coil bobbin and the first support plate. It is characterized in that a plate is installed.

  In addition to the above-described configuration, the AC contactor operating device according to the present invention includes, in the first cover that covers the periphery of the charging coil and the charging / holding coil, the heat of the charging coil and the charging / holding coil. A heat dissipation hole for dissipating heat is provided.

  In addition to the above-described configuration, the AC contactor operating device of the present invention excites only the making coil when the electromagnet is turned on, and the making coil and the making and holding coil are in series when the electromagnet is turned on and held. It is characterized by being excited.

  In addition to the above configuration, the operating device for the AC contactor according to the present invention is configured such that the magnetic flux of the closing coil excites the closing coil from the open position fixed plunger side to the closing position fixed plunger side by the movable plunger. When moving, the direction is opposite to the magnetic flux of the permanent magnet.

  ADVANTAGE OF THE INVENTION According to this invention, the operating device of an alternating current contactor with small power consumption, a simple structure, and high safety | security and reliability can be obtained.

It is a figure which shows schematic structure of the alternating current contactor by which the operating device of the alternating current contactor of this invention is employ | adopted. FIG. 2 is a diagram illustrating an open state of an electromagnet according to the first embodiment of the operating device for an AC contactor of the present invention. FIG. 2 is a diagram showing an electromagnet charging position state according to the first embodiment of the operating device for an AC contactor of the present invention. It is a figure which shows the circuit structure of the coil for insertion and the coil for input holding | maintenance employ | adopted as Example 1 of the operating device of the alternating current contactor of this invention. FIG. 7 is a diagram illustrating an operation state of an AC magnet contactor according to a second embodiment of the present invention, in an electromagnet charging position state.

  Hereinafter, the operation device for an AC contactor of the present invention will be described based on the illustrated embodiment.

  FIG. 1 shows a schematic form of an AC contact in which an operating device for an AC contactor according to the present invention is employed.

  As shown in the figure, the AC contactor 1 includes a blocking unit 4, an operating device 2 that opens and closes the blocking unit 4, a link mechanism 3 that transmits the operation of the operating device 2 to the blocking unit 4, and these blocking units. 4 and a housing 10 that houses the controller device 2 and the link mechanism 3.

  The AC contactor 1 configured as described above is operated by the operating device 2 via the link mechanism 3 to open and close the blocking unit 4. An electromagnetic operating device 2 using an electromagnet 20 is provided, which has a mechanism for maintaining an open state. Reference numeral 33 denotes a fixed rod that supports the electromagnet 20.

  Hereinafter, the controller device 2 will be described with reference to FIGS.

  2 and 3 show Example 1 of the operating device 2 of the AC contactor 1 according to the present invention. As shown in FIG. 2, the operating device 2 of the AC contactor 1 of Example 1 includes a movable flat plate 29 and The movable plunger 25, which is integrally formed and shorter in the radial direction than the movable plate 29, is disposed above and opposed to the movable plunger 25. The bolt 35 is attached to the third support plate 31c made of iron. An open position fixed plunger 27 having substantially the same radial length as that of the fixed movable plate 29 and a movable plunger 25 are arranged opposite to each other across the movable plunger 25, and a bolt 36 is attached to a second support plate 31b made of iron. The closing position fixed plunger 28 having substantially the same radial length as the fixed movable plunger 25, and the movable plunger 25, the open position fixing plunger 27, and the closing position fixing plunger 28 are separated or brought into contact with each other according to electromagnetic force. The closing coil 22 disposed around the closing position fixing plunger 28, and the closing holding coil disposed above the closing coil 22 and straddling the closing position fixing plunger 28 and the open position fixing plunger 27. 23, and the periphery of the making coil 22 and the making and holding coil 23, and the path of the magnetic flux generated from the making coil 22 and the making and holding coil 23 is formed, and the first iron made of a cylindrical shape is formed. The cover 30a and the first support plate 31a are positioned below the open position fixing plunger 27 and above the closing position fixing plunger 28, and are disposed on the first support plate 31a around the movable plunger 25, Permanent magnet that generates electromagnetic force for maintaining the contact state between the movable plunger 25, the open position fixed plunger 27, and the closing position fixed plunger 28. 1 and the electromagnetic force generated from the electromagnet 20 connected to the movable plunger 25 is transmitted to the blocking portion 4 (see FIG. 1) via the link mechanism 3 (see FIG. 1). The shaft 26 is schematically configured.

  The throwing coil 22 and the throwing holding coil 23 are vertically arranged and housed in a coil bobbin 24 positioned between the first support plate 31a and the second support plate 31b. A rubber plate 32 is disposed between the coil bobbin 24 and the first support plate 31a.

  The shaft 26 is arranged along the vertical direction at the center of the electromagnet 20. The upper side of the shaft 26 is a through hole of the first support plate 31 a, and the lower side of the shaft 26 is a through hole of the second support plate 31 b. Each end of the shaft 26 is connected to the link mechanism 3 via a pin, and a movable plunger 25 and a movable flat plate 29 are attached to the outer peripheral surface of the shaft 26 by a nut 34. It is fixed.

  That is, the shaft 26 has the thickest portion that penetrates the third support plate 31c and the open position fixed plunger 27, the second portion where the movable plunger 25 and the movable flat plate 29 are fixed, and the insertion position fixed plunger. The portion that penetrates through 28 is the thinnest. The movable plunger 25 integrated with the movable flat plate 29 receives a part of the movable flat plate 29 at a stepped portion where the thickness of the shaft 26 is different, and is tightened with a nut 34 from below the movable plunger 25 so as to surround the shaft 26. It is fixed.

  Further, the movable plunger 25 is configured to move between the open position fixed plunger 27 and the closing position fixed plunger 28 together with the shaft 26. The open position fixed plunger 27 and the closing position fixed plunger 28 are the open position and the closing position. It is a stopper of the movable plunger 25 in FIG.

  Further, on the opposite side of the closing position fixed plunger 28 to the movable plunger 25, when the movable plunger 25 is at the closing position, the shaft 26 and the nut 34 that fixes the movable plunger 25 and the movable flat plate 29 do not interfere with each other. Is formed.

  Further, in this embodiment, the periphery of the open circuit position fixing plunger 27 is covered with the iron second cover 30b and the third support plate 31c that form the path of the magnetic flux generated from the permanent magnet 21. The open circuit position fixed plunger 27 covered with the second cover 30b and the third support plate 31c is covered with the first coil 30a and the first support plate 31a, and the holding coil 22 and the holding holder. The electromagnet 20 is formed in a convex shape protruding upward in the vertical direction from the coil 23 for use.

  Next, the operation | movement of each position in the operating device of the electromagnetic contactor of a present Example is demonstrated using FIG. 2 thru | or FIG.

  2 shows the open position of the electromagnet 20, and the operation from the open position to the closing position shown in FIG. 3 is that when the open position fixed plunger 27 and the movable flat plate 29 are in contact, the magnetic flux of the permanent magnet 21 is Flowing as indicated by an arrow x, a suction force is generated between the open-circuit position-fixed plunger 27 and the movable flat plate 29, and becomes a holding force in an open circuit state together with a load force.

  At this time, when the closing coil 22 is excited to generate a magnetic flux as indicated by an arrow y, a magnetic flux in a direction opposite to the direction of the magnetic flux of the permanent magnet 21 is generated between the open position fixed plunger 27 and the movable plunger 25. Therefore, when the magnetic flux of the permanent magnet 21 is canceled and the attracting force in the making direction becomes larger than the load force, the movable plunger 25, the movable plate 29 and the shaft 26 are operated, and the movable plunger 25 and the making position fixing plunger 28 are operated. Is touched and stopped. Here, the load force is a spring, a trip spring, or the like for applying a contact pressure to the contact point of the interrupting portion 4.

  After the closing operation is completed, as shown in FIG. 4, the closing coil 22 and the closing holding coil 23 are serially excited to hold the closing state. At this time, the resistance of the making and holding coil 23 is larger than the resistance of the making coil 22.

  The operation from the closing position to the open position is performed by eliminating excitation of the closing coil 22 and the closing holding coil 23, so that the movable plunger 25, the movable flat plate 29 and the shaft 26 have a load force> the attractive force of the permanent magnet 21. The movable plate 29 and the open circuit position fixing plunger 27 come into contact with each other and are stopped.

  According to such a configuration of the present embodiment, by providing the permanent magnet 21, the ampere turn (AT) required for making and holding force can be suppressed, and the coil can be reduced and the power consumption can be suppressed. . Further, the ampere turn (AT) required for the making operation can be made large, the ampere turn (AT) necessary for making the making and holding can be made small, and the coil efficiency is improved by separating the coil into the making coil 22 and making and holding coil 23. And power consumption can be suppressed.

  Further, since the making coil 22 is constantly excited in the making and holding state, the making coil 22 and making and holding are maintained even if there is a problem with the changeover switch that makes the making coil 22 and making and holding coil 23 in series excitation. The situation where no current flows in the coil 23 can be avoided, and the reliability is improved.

  Further, by providing the open position fixed plunger 27 and the closing position fixed plunger 28 at the open position and the closing position of the electromagnet 20, an attractive force is generated in the movable plunger 25 at both the closing position and the open position by the magnetic flux of the permanent magnet 21. Thus, this improves the reliability of state retention.

  Further, the opening position fixing plunger 27 portion covered with the second cover 30b and the third support plate 31c is covered with the making coil 22 covered with the iron first cover 30a and the first support plate 31a. And the iron first cover 30a disposed outside the making coil 22 and the making and holding coil 23 is made of a permanent magnet. 21 and the second cover 30b made of iron disposed outside the open circuit position fixing plunger 27 can be made larger in area, so that a large heat radiation area of the coil portion, which is a heat generating portion, can be secured, and heat radiation efficiency is improved.

  Further, by providing the rubber plate 32 between the coil bobbin 24 and the first cover 30a, the heat transfer rate between the coil bobbin 24 and the first cover 30a becomes larger than that of air, so that the heat dissipation efficiency is improved. Since the rotation of the coil bobbin 24 by the opening / closing operation can be suppressed by the surface pressure of the rubber plate 32, the reliability is improved.

  FIG. 5 shows a second embodiment of the operating device for an AC contactor according to the present invention. In this embodiment shown in the figure, a plurality of (four in this embodiment) heat radiation holes 37 are provided on the upper portion of the first cover 30a. Other configurations are the same as those of the first embodiment.

  According to the present embodiment, the same effects as in the first embodiment can be obtained, and the heat of the making coil 22 and the making and holding coil 23 can be radiated from the heat radiating hole 37. Therefore, further heat dissipation effect can be expected.

  Needless to say, the above-described heat radiation hole 37 may be provided in the lower portion of the first cover 30a.

  DESCRIPTION OF SYMBOLS 1 ... AC contactor, 2 ... Operating device, 3 ... Link mechanism, 4 ... Blocking part, 10 ... Housing, 20 ... Electromagnet, 21 ... Permanent magnet, 22 ... Coil for making up, 23 ... Coil for making up and holding, 24 ... Coil bobbin , 25 ... movable plunger, 26 ... shaft, 27 ... open position fixed plunger, 28 ... closing position fixed plunger, 29 ... movable flat plate, 30a ... first cover, 30b ... second cover, 31a ... first support plate 31b ... second support plate, 31c ... third support plate, 32 ... plate material, 33 ... fixing rod, 34 ... nut, 35, 36 ... bolt, 37 ... radiation hole.

Claims (11)

A blocking unit, an operating device that opens and closes the blocking unit, a link mechanism that transmits the operation of the operating device to the blocking unit, and a housing that stores them.
The operating device includes a movable plunger and a fixed plunger arranged opposite to each other, a coil that separates or contacts the movable plunger and the fixed plunger in accordance with electromagnetic force, covers the periphery of the coil, and magnetic flux generated from the coil An electromagnet having a first cover and a support plate that form a path of the above, and a permanent magnet that generates an electromagnetic force for maintaining a contact state between the movable plunger and the fixed plunger;
In an operating device for an AC contactor, comprising: a shaft coupled to the movable plunger and transmitting an electromagnetic force generated from the electromagnet to the blocking portion via the link mechanism;
The fixed plunger is composed of an open position fixed plunger disposed above the movable plunger and an input position fixed plunger disposed below.
The permanent magnet is positioned below the open position fixed plunger, above the closing position fixed plunger, and disposed on the first support plate around the movable plunger,
The coil is composed of a closing coil disposed around the closing position fixing plunger, an closing position fixing plunger, and a closing holding coil disposed across the open position fixing plunger. Device operating device. In the operating device for an AC contactor according to claim 1,
The shaft is arranged along the vertical direction in the central portion of the electromagnet, and the upper side thereof can be moved up and down and slidable to the through hole of the first support plate, and the lower side thereof to the through hole of the second support plate. An operating device for an AC contactor which is inserted, wherein one end of the shaft is connected to the link mechanism, and the movable plunger is fixed to the outer peripheral surface of the shaft. The operating device for an AC contactor according to claim 2,
The movable contactor moves together with the shaft between the open position fixed plunger and the closing position fixed plunger. In the operating device of the alternating current contactor according to any one of claims 1 to 3,
The operating device for an AC contactor, wherein the open position fixed plunger and the movable plunger are in contact with each other when the electromagnet is opened, and the input position fixed plunger and the movable plunger are in contact with each other when the electromagnet is turned on. In the operating device of the alternating current contactor according to any one of claims 2 to 4,
An operation device for an AC contactor, characterized in that a counterbore that does not interfere with a fixing member that fixes the movable plunger is formed on an outer peripheral surface of the shaft on an opposite side of the insertion position fixing plunger to the movable plunger. . In the operating device of the AC contactor according to any one of claims 1 to 5,
The periphery of the open circuit position fixing plunger is covered with a second cover and a third support plate that form a path of magnetic flux generated from the permanent magnet,
The electromagnet includes an opening coil and a holding coil that are covered with the second cover and the third support plate, and the open position fixing plunger is covered with the first cover and the support plate. An operating device for an AC contactor, wherein the operating device is formed in a convex shape protruding upward in the vertical direction. In the operating device of the AC contactor according to any one of claims 1 to 6,
The input coil and the input holding coil are housed in a coil bobbin, and a rubber plate is installed between the coil bobbin and the first support plate. . In the operating device of the alternating current contactor according to any one of claims 1 to 7,
The first cover covering the periphery of the charging coil and the charging / holding coil is provided with a heat dissipation hole for radiating the heat of the charging coil and the charging / holding coil. Contactor operating device. In the operating device of the AC contactor according to any one of claims 1 to 8,
The operation device for an AC contactor, wherein the first and second covers and the first to third support plates are made of iron. In the operating device of the alternating current contactor according to any one of claims 1 to 9,
The operating device for an AC contactor, wherein only the closing coil is excited when the electromagnet is turned on, and the closing coil and the closing hold coil are excited in series when the electromagnet is turned on and held. In the operating device of the alternating current contactor according to any one of claims 1 to 9,
When the movable plunger excites the closing coil from the open position fixed plunger side to the closing position fixed plunger side, the magnetic flux of the closing coil is opposite to the magnetic flux of the permanent magnet. An operation device for an AC contactor, characterized in that there is.

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