JPH04341721A - Electromagnetic switch - Google Patents

Abstract

PURPOSE:To easily confirm its operation state from any direction even an electromagnetic switch is mounted on a vertical wall of an electric distributor or the like. CONSTITUTION:Operation display means 25, 26, 27 detecting and displaying voltage between fixed contact shoes 5 at least on the power supply side or on the load side are provided while mounting these operation display means 25, 26, 27 on the top of an arc extinguishing chamber 19.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to an electromagnetic switchgear equipped with an arc extinguishing chamber for extinguishing an arc generated when a current is interrupted.
In particular, it relates to an electromagnetic switchgear that displays its operating status and failure status.

0002

2. Description of the Related Art A perspective view of an electromagnetic contactor as a conventional device of this type is shown in FIG. 14, and a sectional view is shown in FIG. In FIG. 14, reference numeral 1 designates a base of an electromagnetic contactor that houses an electromagnetic device consisting of a fixed core 12, a movable core 18, etc. around which the electromagnetic coil 13 shown in FIG. 15 is wound. A coil terminal 16 for applying an operating voltage to the base 1 is integrally molded, and a removable auxiliary contact unit 40 is attached to the base 1. A terminal plate 3 is attached to a frame 2 that is placed on the base 1, and the frame 2
An arc extinguishing chamber 19 is attached to the upper part of. In FIG. 15, a fixed iron core 12 is fixed inside a base 1, and an electromagnetic coil 13 wound around a winding frame 14 is attached to the fixed iron core 12, and a lead wire 15 is connected to the winding start and winding ends of the electromagnetic coil 13. It is connected to the coil terminal section 16 through the coil terminal section 16. Fixed core 1
A movable contact support 8 is connected to a movable iron core 18 which is disposed opposite to the movable iron core 2 and biased by a return spring 17 . The movable contact support 8 is arranged so as to be able to slide vertically through the frame 2, and is connected to the contact spring 11 and the movable contact 1.
It is supported by 0. The movable contact 10 is a movable contact base 8
A and is held at both ends of the leaf spring 8B. The head of the leaf spring 8B is coupled to the upper end of a connecting rod 8C that is slidable within the movable contact support 8, and the lower end of the connecting rod 8C is fitted into the internal space of the contact spring 11. Further, the connecting rod 8C is always urged downward by the contact spring 11. A terminal plate 3 is attached to the frame 2 through which the movable contact support 8 passes, and a fixed contact 5 having a fixed contact 7 is fixed thereto. A grid 20A and a shorting plate 21 are attached to the arc extinguishing chamber 19, and an indicator bar 20 is provided that passes through the arc extinguishing chamber 19 and is biased by a coil spring 20B.

In the above-mentioned electromagnetic contactor, when a current flows through the electromagnetic coil 13, the movable iron core 18 releases the return spring 1.
The movable contact support 8 descends, and the movable contact 9 of the movable contact 10 comes into contact with the fixed contact 7 of the fixed contact 5. As the movable contact support 8 descends, the protruding indicator bar 20B, which is biased by the coil spring 20B, also descends and sinks into the arc extinguishing chamber 19, thereby allowing the operating state of the electromagnetic contactor to be known.

0004

[Problem to be Solved by the Invention] The operating state of this electromagnetic contactor can be known by the amount of protrusion of the indicator bar 20 that protrudes from the arc extinguishing chamber 19, but when the electromagnetic contactor is installed on a vertical wall such as a switchboard, The indicator bar 20 now faces the front, making it difficult to distinguish whether the indicator bar 20 is protruding or retracted, and the user must approach the electromagnetic contactor or visually observe it from a different angle (direction). It was an inconvenience.

[0005] An object of the present invention is to eliminate the drawbacks of the conventional devices described above, and to provide an electromagnetic switching device which is simple in construction and whose operating status can be easily checked from any direction.

[0006]

[Means for Solving the Problems] The present invention includes an electromagnet device comprising a fixed core around which an electromagnetic coil is wound, a movable core arranged opposite to the fixed core, and a movable contact connected to the movable core of the electromagnet device. A movable contact supported with a contact spring on a child support, fixed contacts on the power supply side and load side arranged opposite to this movable contact, and an arc generated between the contacts of the movable contact and the fixed contact. In an electromagnetic switchgear equipped with an arc extinguishing chamber having an arc extinguishing grid, an operation display means for detecting and displaying the voltage between fixed contacts at least on the power supply side or the load side is provided. It was attached to the top of the arc chamber. Further, in the upper part of this arc extinguishing chamber, one end is connected to an operation display means for detecting and displaying the voltage between at least the fixed contacts on the power supply side or the load side, and the other end is connected to an operation display means for detecting and displaying the voltage between the fixed contacts on the power supply side or the load side. A contact piece that abuts the contact is attached to the arc extinguishing chamber, and an indicator light such as an LED is used as an operation indicator, and the blinking light of this indicator light is led out to the outside through an optical fiber. As another means, an operation display unit that detects and displays at least the voltage between fixed contacts on the power supply side or load side is removably attached to the upper surface of the frame, and this operation display unit is equipped with an LED or the like. It was equipped with an indicator light, and the blinking light of this indicator light was transmitted to the outside via an optical fiber.

[0007]

[Operation] When voltage is applied to the electromagnetic coil and the movable contact contacts the fixed contact to close the main circuit, the operation display means or display unit provided on the top of the arc extinguishing chamber or the top surface of the frame of the electromagnetic switchgear will operate. This displays the operating status of the electromagnetic switchgear, and if the main circuit remains closed due to welding of the contacts even though the voltage to the electromagnetic coil has been cut off, the fixed contact on the load side A fault display means that detects and displays contact welding based on the voltage between the two and the voltage supplied to the electromagnetic coil (no voltage) operates to notify that the contact has welded. Furthermore, an LED is used as the operation display means or display unit, and the lighting light of the LED is transmitted to the outside through an optical fiber, so that the operation status can be easily checked from any direction.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is a perspective view. Components designated by the same reference numerals as in FIGS. 14 and 15 are the same parts. 1 and 2, the difference from the conventional electromagnetic contactor shown in FIGS. 14 and 15 is that the terminal screws of the terminal plate 31 connected to the fixed contact 5 on the load side of the main circuit are screwed together. A printed circuit board 27 to which a lead wire 29 having a crimp terminal 30 is connected and on which an operation display means to be described later is mounted is provided in the upper part of the arc extinguishing chamber 19, and this printed circuit board 27 is covered with a cover 28. The printed circuit board 27 is equipped with an electronic circuit component 26 that constitutes a detection circuit that detects the voltage applied to the two terminal plates 31 of the load terminals connected by lead wires 29, and is turned on by the output of the detection circuit. An operation display lamp 25 is attached as an operation display means. Although the operation indicator lamp 25 is directly exposed to the outside from the cover 28 as shown in the figure, the operation indicator lamp 25 may be built into the cover 28 by forming a transparent portion.

In this embodiment, a voltage is applied to an electromagnetic coil (not shown), and current flows through the main circuit where the movable contact 9 contacts the fixed contact 7, and as a result, a voltage appears between the terminal plates 31 on the load side. The operation indicator lamp 25 lights up to indicate that the electromagnetic contactor is in operation. When the voltage to the electromagnetic coil is cut off, if no welding of the contacts occurs, the voltage between the terminal plates 31 on the load side also disappears, so the operation indicator lamp 25 goes out. On the other hand, when the voltage to the electromagnetic coil is cut off, if the contacts are welded, the main circuit remains closed and voltage continues to be applied between the terminal plates 31 on the load side. Operation indicator lamp 2
5 remains lit. Therefore, if the operation indicator lamp 25 is lit even though the voltage to the electromagnetic coil has been cut off, it can be known that there is a failure state in which the contacts are welded.

FIG. 3 is a side sectional view of a main part showing a second embodiment of the present invention. The difference from the embodiment shown in FIGS. 1 and 2 is that the terminal board on the load side is 31 and the detection circuit of the printed circuit board 27 are electrically connected. That is, the lead wire 29 connected to the printed circuit board 27 having the coupling fitting 29B is fitted into the side wall of the arc extinguishing chamber 19, and one end is coupled to the coupling fitting 29B, and the other end is a contact piece that comes into contact with the screw fixing the terminal plate 31. 2
9C, and a printed circuit board 27, a lead wire 29A, a coupling fitting 29B, and a contact piece 29C are integrally attached to the arc extinguishing chamber 19. The contact piece 29C is made of an elastic member and can also be configured to come into pressure contact with the screw. In this embodiment, by attaching the arc extinguishing chamber 19 to the frame 2, the contact piece 29C comes into contact with the screw of the terminal plate 31, thereby connecting the coupling fitting 29B and the lead wire 29A.
The detection circuit of the printed circuit board 27 is connected to the terminal board 31 via. This embodiment is the same as the embodiment shown in FIGS. 1 and 2 in that the operation indicator lamp 25 is lit when a voltage is applied to the terminal plate 31 on the load side.

FIG. 4 is a wiring diagram showing a third embodiment of the present invention, where 31A is an electromagnetic contactor having main contacts 31a, 31b, 31c, auxiliary contacts 31d, and electromagnetic coil 31e, and 41 is a tripping coil 42. molded case circuit breaker,
43 is an operating power source for operating the tripping coil 42;
1 is an electronic unit having an operation display means 25 and a failure display means 25A, and has an operation and failure detection circuit 52. The power supply side of the electromagnetic contactor 31A is connected to power supplies R, S, and T via a molded circuit breaker 41, and each phase U and T on the load side are connected to each other.
An electric motor 56 is connected to V and W. Electromagnetic coil 3
1e is connected to power supplies R and S via a closing switch 57, and is excited when the closing switch 57 is turned on. Operation voltage input terminal 52a of operation and failure detection circuit 52,
52b is also connected to power supplies R and S, and an operating voltage is applied thereto. Release command input terminals 53a and 53b of the operation and failure detection circuit 52 are connected to the operating power source of the electromagnetic coil 31, and detect whether the closing switch 57 is turned on or off. Detection circuit terminal 54a of operation and failure detection circuit 52,
54b, 53c are the main contacts 31 of the electromagnetic contactor 31A.
Each phase U, V, on the load side of a, 31b, 31c
W and detects the line voltage of each phase. The operation and failure detection circuit 52 has operating voltage input terminals 52a and 52b.
The operation circuit unit 52A connected to the release command input terminal 5
3a, 53b and detection circuit terminals 54a, 54b,
53b connected to the operation and failure detection section 52B.
It is connected to an operation indicator lamp 25 as an operation indicator that lights up based on the output of the operation and failure detector 52B, a failure indicator lamp 25A as a failure indicator, and an output relay control circuit 55A that drives the output relay 55. It has an output terminal 52C. A common terminal 55a of the output relay 55 is connected to one end of the operating power supply 43, a normally open contact terminal 55b of the output relay 55 is connected to one end of the tripping coil 42 of the molded circuit breaker 41,
A normally closed contact terminal 55b of the output relay 55 is connected to an alarm device or the like in a central control room (not shown).

[0012] When the molded circuit breaker 41 is closed,
When the closing switch 57 is turned on, the electromagnetic coil 31e is excited, the main contacts 31a, 31b, 31c and the auxiliary contact 31d are turned on, and the electric motor 56 is operated. When the main contacts 31a, 31b, 31c are closed, the detection circuit terminal 54a of the operation and failure detection circuit 52
, 54b, 54c are applied with interphase voltage, but voltage is applied to the release command input terminals 53a, 53b because the closing switch 57 is turned on, so the failure indicator lamp 25A is turned off. Since the output terminal 52c remains open and there is no output from the output terminal 52c, the output relay 55 is also in a de-energized state. At this time, since voltage is applied to the release command input terminals 53a and 53b, the operation indicator lamp 25 lights up. In order to stop the electric motor 56, the closing switch 57 is opened and the electromagnetic coil 31e is turned off.
When power is cut off to the main contacts 31a, 31b, 3
1c is cleared and released. Furthermore, by opening the closing switch 57, the voltage applied to the release command input terminals 53a and 53b of the operation and failure detection circuit 52 is cut off, and thereby the operation and failure detection circuit 52 issues a release command to the electromagnetic contactor 31A. The operation indicator lamp 25 is turned off. Main contacts 31a, 31b,
If there is no contact welding failure in contactor 31c, the detection circuit terminals 54a, 5 are activated by the release command of the magnetic contactor 31A.
No voltage is generated at 4b and 54c, but main contact 31a
, 31b, 31c have welded contacts, a voltage is applied to the detection circuit terminals 54a, 54b, 54c. In this case, the operation and failure indication detection circuit 52 connects the main contact 31 to the detection circuit terminals 54a, 54b, 54c.
Since the main contacts 31a, 31b, and
When contact welding occurs in at least two phases of 31c, a contact welding failure is detected. When the operation and failure detection circuit 52 detects a contact welding failure, the failure indicator lamp 25A lights up and an output is generated from the output terminal 52c to output the output relay 5.
5 is excited. When the output relay 55 is operated, the relay contacts are switched, the tripping coil 42 is excited, the molded circuit breaker 41 is operated, and the main circuit is cut off.

An electronic unit having an operation and failure detection circuit 52 is mounted on a printed circuit board and installed in the upper part of the arc chamber in the same manner as in the embodiment shown in FIGS. 1 to 3, and has an operation indicator lamp 25 and a failure indicator. The lamp 25A indicates the operating status of the electromagnetic contactor and the contact welding failure status.

FIG. 5 is a side sectional view of a main part showing a fourth embodiment of the present invention, FIG. 6 is a perspective view, and FIG. 7 is a wiring diagram. In this structure, a printed circuit board 127 is connected to a lead wire 129. An electronic circuit 126 is mounted to detect the voltage of the terminal plate 103 connected to the fixed contact 105 on the load side, and an operation display LED 125 is installed as an operation display means that lights up with the output of this electronic circuit 126. Optical fiber 1 is connected to the operation display LED 125.
28 is optically connected and drawn out. In this embodiment, when an externally provided closing switch 151 is turned on, a current flows through the electromagnetic coil 113, and as explained in the conventional device shown in FIG. 15, the movable core (not shown) is attracted to the fixed core (not shown). , movable contact support 108
moves down and the movable contact 109 of the movable contactor 110 comes into contact with the fixed contact 107, the main switch 131 is closed and current flows through the main circuit. As a result, a voltage is generated between the phases of the terminal board 103 on the load side, and the operation indicator LED 125 lights up to indicate that the electromagnetic contactor is in operation.
8, so it can be checked at any location. When the closing switch 151 is opened and the energization to the electromagnetic coil 113 is cut off, the movable contact 109 and the fixed contact 10
If no welding occurs on 7, the terminal plate 103 on the load side
Since the voltage between the phases is also gone, the operation indicator LED1
25 goes out. Furthermore, when the power to the electromagnetic coil 113 is cut off and the movable contact 109 and the fixed contact 107 are welded, the main switch 131 remains closed, so there is a voltage between the phases of the terminal plate 103 on the load side. continues to be applied, and as a result, the operation display LED 125 continues to be lit. That is, when the operation display LED 125 is lit, it can be known that there is a failure state in which the contacts are welded.

FIG. 8 is a side sectional view of a main part showing a fifth embodiment of the present invention, and the same parts as in the fourth embodiment shown in FIG. do. The difference between the fifth embodiment and the fourth embodiment is that the printed circuit board 1
27 electronic circuit 126 and load side fixed contact 105
The point is that the terminal plate 103 and the electronic circuit 126 are electrically connected by attaching the arc extinguishing chamber 119 in the connection structure with the terminal plate 103 connected to the terminal plate 103. That is, a lead wire 129A is connected to a printed circuit board 127 having a coupling fitting 129B on the side wall of the arc extinguishing chamber 119.
A contact piece 129c is provided, one end of which is connected to the coupling fitting 129B and the other end abuts against the terminal plate 103, and the printed circuit board 127, lead wire 129A,
The coupling fitting 129B and the contact piece 129C are integrally attached. The contact piece 129C may be formed of an elastic member and configured to press against the screw 129D, or may be configured to be vertically slidable and biased by a coil spring to press against the screw 129D. . In this fifth embodiment, by attaching the arc extinguishing chamber 119 to the frame 102, the contact piece 129C comes into contact with the screw 103A of the terminal plate 103, and thereby the electronic A circuit 126 is connected to the terminal board 103. This embodiment is the same as the fourth embodiment in that the operation display LED 125 lights up when a voltage is applied to the terminal plate 103 on the load side, and the wiring diagram is also the same as in FIG.

9 and 10 show a sixth embodiment of the present invention, with FIG. 9 being a perspective view of an operation display unit, and FIG. 10 being a perspective view of an electromagnetic contactor. This embodiment is for an electromagnetic contactor that does not have an arc extinguishing chamber, and an operation display unit 160 that detects and displays the voltage applied to the electromagnetic coil is placed on the top surface of the frame 102 of the electromagnetic contactor. . In this case, the operation display unit 160 includes an electronic circuit (not shown) (indicated by reference numeral 126 in FIGS. 5 and 8) for detecting the interphase voltage applied to the terminal plate 103 on the load side, and an operation display LED (not shown). (Denoted by reference numeral 125 in FIGS. 5 and 8) is built in, a lead wire 129D is drawn out from the electronic circuit, and a lead wire 115 is drawn out to be connected to the power supply side and the electromagnetic coil. Further, an optical fiber 128 optically connected to the operation display LED is also led out. When mounting this operation display unit 160 on an electromagnetic contactor, the frame 10
The claw portion 123 provided on the bottom surface of the operation display unit 160 is inserted into and engaged with the hook 122 provided on the surface of the operation display unit 160. and lead wire 1
Connect the tip of 29D to the load side terminal plate 1 on the frame 102.
03, and connect the tip of the leader wire 115 to the base 101.
Connect to the coil terminal section 116 located at The condensation detection diagram of this embodiment is also the same as that shown in FIG.

FIGS. 11 to 13 show an example of an electromagnetic contactor without an arc extinguishing chamber in which only the operation display can be confirmed. FIG. 11 is a perspective view of the electromagnetic contactor, and FIG. 12A is a coil drive Perspective view of the unit, Figure 12A is Figure 12B
FIG. 13 is a perspective view taken from arrow P, and FIG. 13 is a wiring diagram. In this embodiment, the coupling piece 104B of the coil drive unit 160A is inserted into the coupling recess 104 on the base 101 side of the electromagnetic contactor and fixed by engaging with the coupling protrusion 104A, and the contact piece 129C contacts the coil terminal 116. A tightened electrical connection is made by terminal screws 116A. In addition, the operation display LED 125 is connected to the optical fiber 12.
8 is optically connected and drawn out. In this embodiment, when voltage is applied to the electromagnetic coil 113 and current flows, the operation indicator LED 125 lights up to indicate that it is in operation, but the blinking light of the operation indicator LED 125 is transmitted through the optical fiber 128, so it is optional. You can check it at the location. When the power to the electromagnetic coil 113 is cut off, the operation display LED 125 turns off.

[0018]

Effects of the Invention In this invention, an operation display LED is provided which detects and displays the voltage between at least the fixed contacts on the load side, and an optical fiber is optically connected to this operation display LED, so the operation can be displayed from any direction. By checking the blinking of the LED, it is also possible to determine whether the electromagnetic switching device is in an operating state or a failure state.

[Brief explanation of drawings]

[Fig. 1] A side cross-sectional view of essential parts showing a first embodiment of the present invention.

[Figure 2] Perspective view of Figure 1

[Fig. 3] Side sectional view of main parts showing a second embodiment of the present invention

[Fig. 4] A wiring diagram showing a third embodiment of the present invention.

[Figure 5]
A side sectional view of a main part showing a fourth embodiment of the present invention

[Figure 6]
Perspective view of Figure 5

[Figure 7] Connection diagram of the embodiment in Figure 5

[Fig. 8] Side sectional view of main parts showing a fifth embodiment of the present invention.

[Figure 9] Perspective view of operation display unit

FIG. 10 is a perspective view of an electromagnetic contactor to which the operation display unit shown in FIG. 9 is attached.

[Figure 11] Perspective view of electromagnetic contactor

[Fig. 12] A is a perspective view of the coil drive coil unit, B
is a perspective view of arrow P in Figure 12A.

[Figure 13] Connection diagram of Figures 11 and 12

[Figure 14] Perspective view of a conventional electromagnetic contactor

[Figure 15] Cross-sectional view of Figure 14

[Explanation of symbols]

5 Fixed contact 7 Fixed contact 9 Movable contact 19 Arc extinguishing room 25 Operation indicator lamp 27 Printed circuit board

Claims (6)

[Claims] Claim 1: An electromagnet device consisting of a fixed core around which an electromagnetic coil is wound, a movable core placed opposite to the fixed core, and a movable contact support connected to the movable core of the electromagnetic device, supported together with a contact spring. An extinguisher having a movable contact, a fixed contact on the power supply side and a load side disposed opposite to the movable contact, and a grid for extinguishing an arc generated between the contacts of the movable contact and the fixed contact. In the electromagnetic switchgear equipped with an arc chamber, an operation display means for detecting and displaying the voltage between fixed contacts at least on the power supply side or the load side is provided, and this operation display means is attached to the upper part of the arc chamber. An electromagnetic switchgear characterized by: 2. The device according to claim 1, wherein one end is connected to an operation display means for detecting and displaying a voltage between fixed contacts at least on the power source side or the load side, and the other end is connected to the power source side or the load side. An electromagnetic switching device characterized in that a contact piece that comes into contact with a movable contact is attached to an arc extinguishing chamber. 3. The apparatus according to claim 1 or 2, wherein the fault display means detects and displays welding of the contacts based on at least the voltage between the fixed contacts on the power supply side or the load side and the voltage supplied to the electromagnetic coil. An electromagnetic switching device characterized in that the failure indicating means is attached to the upper part of the arc extinguishing chamber. 4. The electromagnetic switching device according to claim 1, wherein an indicator light such as an LED is used as the operation display means, and the flashing light of the indicator light is led out through an optical fiber. Device. 5. An electromagnet device comprising a fixed iron core around which an electromagnetic coil is wound, a movable iron core arranged opposite to the fixed iron core, and a movable contact support connected to the movable iron core of this electromagnetic device supported together with a contact spring. In an electromagnetic switchgear equipped with a movable contact and fixed contacts on the power supply side and load side arranged opposite to the movable contact, the voltage between at least the fixed contacts on the power supply side or the load side is detected. An electromagnetic switchgear characterized in that an operation display unit for displaying the above-mentioned electromagnet device, a fixed contact, and a movable contact is detachably attached to the upper surface of a frame that accommodates the electromagnet device, a fixed contact, and a movable contact. 6. The electromagnetic switching device according to claim 5, wherein the operation display unit includes an indicator light such as an LED, and the blinking light of the indicator light is transmitted to the outside via an optical fiber. .