JPH0326491B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a fault indicator, and more particularly, to a fault indicator that can provide an operating output using a magnetic field generated from an electromagnet.

[Background of the invention]

Examples according to the prior art will be explained with reference to FIGS. 1 to 4.

Figure 1 shows the front side of the fault indicator. There is a display window 1A and a return lever hole 1B in the center of the case 1, and a display board return lever 1 is located in the return lever hole 1B.
There is 1E. FIG. 2 shows the internal mechanism of the failure indicator, and the mechanism part disposed on the base 2 is housed in the case 1, and is designed to display information on the display window 1A on the front surface of the case 1.

When a failure occurs, a failure response relay (not shown)
When the contact is closed and the power supply voltage is applied to the coil terminal 3, the operating coil 6 is excited through the coil lead 4 connected to the coil terminal 3. The operating coil 6 is wound around the bobbin 5, and an inverted L-shaped yoke 7 is arranged below the bobbin 5, and the armature shaft 1 is attached to the inverted L-shaped 5A at the tip of the bobbin 5.
An armature 9 is attached so that it can rotate at 2. Further, a display plate 11 is attached to the rear portion 5B of the bobbin 5 so as to be rotatable about a display plate shaft 13.

Therefore, when the working coil 6 is excited, a magnetic path is formed by the iron core 8 made of a magnetic material, the yoke 7, and the armature 9, and the armature 9 is attracted to the iron core 8, but the working coil 6 When is not energized, the armature 9 is pulled away from the iron core 8 by the return spring 16, and the protrusion 9A of the armature 9 hits the yoke 7 and stops.

In the display board 11, the display board holding piece 11D is connected to the armature 9.
Under normal conditions, it is prevented from falling. Further, the display board 11 has a normal display section 11A and a failure display section 11B, which can be distinguished by painting or the like.

When a failure occurs, the armature 9 is attracted to the iron core 8, and the insulating contact drive piece 10 attached to the L-shaped tip of the armature 9 causes the movable contact piece 15, which is an elastic conductor, to It makes contact with the fixed contact piece 14 at the tip protrusion to form a signal circuit. At this time,
The armature 9 is disengaged from the display board holding portion 11D, and the display board 11 falls due to gravity, and the arm portion 11C of the display board 11 is attached to the inverted L-shaped front protrusion 5C of the bobbin 5.
hits it and stops. At this time, the display on the display window 1A changes from the normal display section 11A to the failure display section 11B. This state is shown in FIG.

Due to failure recovery, failure response relay (not shown)
When the is restored, the operating coil 6 is de-energized, the armature 9 is separated from the iron core 8 by the return spring 16, and the movable contact piece 15 is accordingly returned and released from contact with the fixed contact piece 14, and the signal circuit is solved.
This state is shown in FIG. From this state, display board 1
When the display board return lever 11E of No. 1 is pushed upward, the armature 9 compresses the return spring 16 by the amount of engagement with the display board holding piece 11D, but the display board holding piece 11D is pushed upward by the armature 9. When it goes up, armature 9
The return spring 16 returns the armature protrusion 9A to the position where it touches the yoke 7, and the display plate return lever 11
Even if the external force pushing up E is removed, the display board 11
Since the armature 9 and the display plate holding piece 11D engage with each other, the display window 1A is held in a position where the normal display section 11A is displayed, and the display panel is in the state shown in FIG. 2 before the failure occurs.

In the fault indicator configured in this manner, the magnetic force that attracts the armature 9 to the iron core 8 is increased in order to bring the movable contact piece 15 into contact with the fixed contact piece 14 in order to configure the signal circuit. Therefore, the operating coil 6 becomes large in size, and the failure indicator becomes large and expensive.

[Object of the Invention] An object of the present invention is to forcibly generate leakage magnetic flux from an electromagnet in a switch mechanism that constitutes a signal circuit, regardless of the armature attracted to the iron core, and to operate the switch mechanism directly by this magnetic field. By doing so, the operating coil can be made compact and an inexpensive failure indicator can be provided.

[Summary of the invention]

The purpose of the present invention is to make a part of the cross section of the magnetic path of the electromagnet narrower than the other cross section, and apply electromagnetic force to the contact part of the switch made of conductive magnetic material by leakage magnetic flux generated from this part. Since the signal circuit is constructed by operating the switch, the load on the operating coil can be reduced, and the failure indicator can therefore be manufactured economically.

[Embodiments of the invention]

Embodiments according to the present invention will be explained with reference to FIGS. 5 to 10.

FIG. 5 shows the front side of the fault indicator. There is a display window 1A and a return lever hole 1B in the center of the case 1, and a display board return lever 1 is located in the return lever hole 1B.
There is 1E. FIG. 6 shows the internal mechanism of the failure indicator. The mechanism part arranged on the base 2 is housed in the case 1, and is adapted to display information on the display window 1A on the front side of the case 1.

When a failure occurs, a failure response relay (not shown)
When the contact is closed and the power supply voltage is applied to the coil terminal 3, the operating coil 6 is excited through the coil lead 4 connected to the coil terminal 3. The operating coil 6 is wound around the bobbin 5, and an inverted L-shaped yoke 7 is arranged below the bobbin 5, and the armature shaft 1 is attached to the inverted L-shaped front part 5A at the tip of the bobbin 5.
An armature 9 is attached so that it can rotate at 2. Further, a display plate 11 is attached to the rear portion 5B of the bobbin 5 so as to be rotatable about a display plate shaft 13.

Therefore, when the working coil 6 is excited, a magnetic path is formed by the iron core 8 made of a magnetic material, the yoke 7, and the armature 9, and the armature 9 is attracted to the iron core 8, but the working coil 6 When is not energized, the armature 9 is pulled away from the iron core 8 by the return spring 16, and the protrusion 9A of the armature 9 hits the yoke 7 and stops.

In the display board 11, the display board holding piece 11D is connected to the armature 9.
Under normal conditions, it is prevented from falling. Further, the display board 11 has a normal display section 11A and a failure display section 11B, which can be distinguished by painting or the like.

Between the front part 5A and rear part 5B of the bobbin 5, a pair of conductive magnetic leads 17A and 17B are made so as to be elastically movable, and are sealed in the tube 17C with appropriate overlap and gap. A magnetically driven switch 17 is arranged.

The structure of the magnetic drive switch 17 is shown in FIG.

The conductive magnetic leads 17A and 17B of this magnetically driven switch 17 are connected to contact leads 1 and 17B, respectively.
It is connected to the contact terminal 18 through the terminal 9, so that it can be connected to an external circuit.

When a failure occurs, the operating coil 6 forms a magnetic path with the yoke 7, iron core 8, and armature 9.

As shown in FIG. 9, which shows the mechanism at the bottom of the failure indicator, the cross section of the yoke 7, which is part of the magnetic path, is provided with a narrow yoke section 7A that is narrower than the other cross section, and magnetic flux leaks from this section. to occur. Due to this leakage magnetic flux, the conductive magnetic leads 17A and 17B enclosed in the magnetic drive switch 17 disposed nearby become magnetized, attract each other and come into contact with each other, forming a signal circuit. At this time, the armature 9 is attracted to the iron core 8, so the armature 9 is disengaged from the display plate holding piece 11D, and the display plate 11 falls due to gravity, causing the inverted L-shaped front part of the bobbin 5 to disengage. The arm portion 1 of the display board 11 is attached to the protrusion 5C of the display board 11.
1C hits and stops. At this time, the display on the display window 1A changes from the normal display section 11A to the failure display section 11B. This state is shown in FIG.

Due to failure recovery, failure response relay (not shown)
When the yoke returns, the operating coil 6 becomes de-energized, the armature 9 is separated from the iron core 8 by the return spring 16, and the yoke 7 also loses its magnetism, so the conductive magnetic lead 17A of the magnetic drive switch 17, 17B returns due to its elasticity, the contact is separated, and the signal circuit is released. This state is shown in FIG. When the display board return lever 11E of the display board 11 is pushed upward from this state, the armature 9 compresses the return spring 16 by the amount that the armature 9 engages with the display board holding piece 11D, but the display board holding piece 11D comes into contact with the armature 9. When the armature 9 is raised upward by the pole 9, the return spring 16 returns the armature 9 to the position where the armature protrusion 9A touches the yoke 7, and even if the external force pushing up the display board return lever 11E is removed, the display board 11 Since the armature 9 and the display plate holding piece 11D engage with each other, the display window 1A is held in a position where the normal display portion 11A is displayed, resulting in the state shown in FIG. 6 before the occurrence of the failure.

Even if the cross section of the yoke 7 is narrowed to generate leakage magnetic flux, most of this leakage flux returns to the yoke 7 via the magnetic drive switch 17, so it will not affect the attractive force of the armature 9. do not have.

According to one embodiment of the present invention, the operation of the switch constituting the signal circuit is controlled not by the armature 9 attracted to the iron core 8, but by narrowing a part of the cross section of the yoke 7, which is the magnetic path. By generating leakage magnetic flux from this portion and directly operating the switch mechanism by this magnetic flux, the operating coil 6 can be manufactured in a small size, and an inexpensive failure indicator can be manufactured. In addition, since the amount of leakage magnetic flux can be arbitrarily obtained depending on the cross-sectional size of the yoke 7 in accordance with the sensitivity of the magnetic drive switch 17, it is possible to stabilize the operation of the magnetic drive switch 17, and to prevent failures with high reliability. This has the effect of allowing display devices to be manufactured.

In this embodiment, the cross section of the magnetic path of the yoke 7 is narrowed, but leakage magnetic flux will occur no matter where the cross section of the magnetic path is narrowed, and the same effect can be obtained even if the magnetic drive switch 17 is placed in the vicinity. is obtained.

〔Effect of the invention〕

According to the present invention, since the contact output is obtained by the magnetically driven switch, the capacity of the operating coil can be made small, so it is possible to provide an inexpensive failure indicator.
In addition, since the amount of leakage magnetic flux that operates the magnetically driven switch can be arbitrarily selected according to the sensitivity of the magnetically driven switch, sufficient magnetic flux can be obtained to operate the magnetically driven switch, and a highly reliable fault indicator can be obtained. There is an effect that can be provided.

[Brief explanation of drawings]

FIG. 1 is a front view of a failure indicator according to the prior art, and FIG. 2 is a side view showing the internal mechanism of FIG. 1 in a normal state. FIG. 3 shows the state of FIG. 2 when the failure occurs. FIG. 4 shows a state in which the failure shown in FIG. 3 has been recovered. FIG. 5 is a front view of the fault indicator according to the present invention, and FIG. 6 is a side view showing the internal mechanism of FIG. 5 in a normal state. FIG. 7 shows the state of FIG. 6 when the failure occurs. FIG. 8 shows a state in which the failure shown in FIG. 7 has been recovered. FIG. 9 is a bottom view showing the internal mechanism of FIG. 8, and FIG. 10 shows the structure of the magnetic drive switch. 1...Case, 1A...Display window, 1B...Return lever hole, 2...Base, 3...Coil terminal, 4...Coil lead, 5...Bobbin, 5A...Bobbin front, 5B...Bobbin rear, 5C...Bobbin protrusion, 6 ...Operating coil,
7... Yoke, 7A... Yoke narrow part, 8... Iron core, 9... Armature, 9A... Armature projection, 10... Contact drive piece, 1
1...Display board, 11A...Display board flat display section, 11B
...Display board failure display section, 11C...Display board arm section, 11
D... Display board holding piece, 11E... Display board return lever,
12... Armature shaft, 13... Display plate axis, 14... Fixed contact piece, 15... Movable contact piece, 16... Return spring, 17
...Magnetic drive switch, 17A...Magnetic lead, 1
7B...Magnetic material lead, 18...Contact terminal, 19...Contact lead.

Claims (1)

[Claims] 1. A base, a coil consisting of a coil wound around a bobbin fixed to the base and having an iron core, and an armature that is attracted to the front of the bobbin by the excitation of the coil, and is normally in contact with the front of the bobbin. A display board comprising a rotatable armature separated from the pole by a spring, one end of an arm rotatably supported, and a display section at the other end, the display board comprising: a display plate that is locked by the armature when the coil is in an energized state and rotates when the armature is released from the lock when the coil is energized; A yoke that forms a magnetic path with the yoke and has a part of the cross section narrower than the other part of the yoke, and a lead that is placed near the narrow cross section of the yoke and provided between the front and rear parts of the bobbin. relay,
and a case for accommodating the above-mentioned components between the base and the fault indicator.