JPH02273429A - Operation display device for solenoid relay - Google Patents

Abstract

PURPOSE:To improve reliability an productivity an reduce failure by dividing an exciter coil into a primary and a secondary coils, connecting the primary and secondary coils in series, and connecting an operation display circuit having a light emitting element to the secondary coil in parallel. CONSTITUTION:When a dc voltage is applied between coil terminals 25a and 25b to excite a primary coil 13 and a secondary coil 14, a movable iron piece 5 is attracted, a normally closed contact point is opened, and a normally opened contact point is closed. At the same time, a divided voltage proportionate to the impedance ratio of the coils 13 to 14 is applied to an operation display circuit 10. This causes a light emitting diode to emit light to verify that a solenoid relay is in operation. If the primary coil 13 breaks, current does not flow through the primary coil 12 nor through the secondary coil 14, the solenoid relay does not operate, and the light emitting diode does not emit light. Thus, operation display according to the operation of the solenoid relay is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an operation display device for an electromagnetic relay that applies a DC voltage to an operating coil.

(Prior art) Generally, an electromagnetic relay has one for excitation, as shown in Fig. 3.
Next, an L-shaped yoke 3 is attached to one end of the iron core 2 around which the coil I is wound.
A fixed electromagnet 4, etc., a 17-shaped movable iron piece 5 supported at the tip of the yoke 3 so as to be swingable based on the energization and non-excitation of the electromagnet 4, and a movable iron piece 5 driven by the movable iron piece 5. It consists of a non-contact contact mechanism.

In this type of electromagnetic relay, a secondary coil 6 for operation indication is wound around the iron core 2 of the electromagnet 4 separately from the primary coil 1, and a current limiter is connected to the coil terminal 7a71) of the secondary coil 6. Operation display circuit 10 consisting of a resistor 8 and a light emitting diode 9
An operation display device is installed (J) connected in parallel with the secondary filter 6.
I'm here.

When an AC voltage is applied to the primary coil I to operate it, a voltage is generated on the secondary coil side due to the change in the magnetic field generated in the iron core 2. The light emitting diode 9 of the operation display circuit 10 lights up to display the operation.

However, even if an electromagnetic relay that applies DC voltage to the operating coil is provided with an operation display device with a similar configuration to that of the AC electromagnetic relay, the magnetic field generated in the iron core due to energization of the primary coil is Since the current is constant and no electromotive voltage is generated in the secondary coil, no current flows through the operation display circuit and no operation display is performed.

Therefore, conventionally, an operation display circuit 10 is installed in the DC circuit 7 [as shown in FIG. It has a connected configuration.

(Problems to be Solved by the Invention) However, in such an operation display device for a DC electromagnetic relay, since the operation display circuit 10 and the excitation coil 11 are connected in parallel, the excitation coil II or the disconnection 1. Even if the device stops operating, a current flows through the operation display circuit 10 and the light emitting diode 1'9 lights up, which poses a problem of not being able to display the correct operation.

In addition, since the excitation voltage applied to the coil terminals], 2a, l 2b is directly applied to the operation display circuit 10, an operation display circuit 10 with a different resistance value must be provided for each electromagnetic relay with a different rated value of the excitation voltage. The voltage is always applied to the display circuit to display the operation.

When the primary coil is disconnected, current no longer flows to the secondary coil, so the operation display circuit does not operate.

Further, when the secondary coil is disconnected, the voltage applied to the operation display circuit changes, so the brightness of the light emitting element of the operation display circuit changes.

Further, according to the structure of claim 2, since the secondary coil is wound on the inside which is most likely to deteriorate due to the highest temperature, the secondary coil deteriorates first and breaks due to long-term use, and the operation display circuit The brightness of the light emitting element changes.

(Example) Next, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a circuit diagram of an operation display device according to the present invention,
This operation display device connects the excitation coil to the primary coil I3 and 2.
It is divided into the secondary coil 14 and wound around the iron core 2, and the secondary coil 1
4 is connected to the relay part 15a15b, and the primary coil 13 and the secondary coil 14 are connected in series via the relay part 15b.In addition, productivity is poor and the operation display circuit 10 is exposed to high voltage such as surge voltage. If the voltage is applied to the current, the light emitting diode 9 may malfunction.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an operation display device for an electromagnetic relay that can perform reliable operation display, has good productivity, and has fewer failures.

(Means for Solving the Problems) In order to achieve the above object, the invention according to claim 1 divides the excitation coil into a primary coil and a secondary coil and winds them around an iron core. A secondary coil is connected in series, and an operation display circuit having a light emitting element is connected in parallel to the secondary coil.

Furthermore, the invention according to claim 2 is such that the secondary coil of the invention according to claim I is wound inside the primary coil.

(Function) According to the structure of claim 1, the partial pressure corresponding to the impedance ratio of the primary coil and the secondary coil is applied to the operation relay section 15a,
An operation display circuit 10 is connected in parallel to +5b.

FIG. 2 shows an electromagnetic relay equipped with an operation display device having the circuit configuration described above.

By press-fitting the yoke 3 into the base 16, the electromagnet 4 is attached to the iron core 2 (not shown) to the I\-s 16.
are fixed so that they are parallel.

An operation display circuit holding block I7 holding a current limiting resistor 8 and a light emitting diode 9 is attached to two sides of the yoke 3 by hooks 18.

The movable iron piece 5 engages with the tip of the yoke 3 and is swingably supported, and is biased by a coil spring 19 in a direction (=l) away from the magnetic pole surface of the iron core 2 (not shown). A pair of movable contact pieces 20.20 having movable contacts are attached to this movable iron piece 5. This movable contact piece 20.20 includes a movable contact terminal 2+ fixed to the base I6, . The normally closed contacts of the fixed terminals 24.

The primary coil 13 and the secondary coil I4 are the secondary coil 14
It is wound around the iron core 2 (not shown) so that the side is on the inside. The lead wire 1.3a at one end of the primary coil 13 is connected to the relay part 151 at the tip of the lead piece 9a of the light emitting diode 9, and the lead wire 131 at the other end is connected to a coil terminal fixed to the base 16. 251). Further, a lead wire (not shown) at one end of the secondary coil 14 is connected to a relay portion 15 at the tip of the reed piece 8a of the current limiting resistor 8.
a (not shown) and the other end of the drawer 1. line 1.4b
t4 the relay section 151]. Furthermore, 1
Relay part 15a (not shown) (J, connected to coil terminal 25a (not shown) at the tip of lead piece 8a described in 17j.

In this electromagnetic relay, coil terminals 25a, 251]
When a DC voltage is applied between them to excite the primary coil 13 and the secondary coil 14, the movable iron piece 5 is attracted to the iron core 2 and the movable contact piece 20.20 is driven, so that the normally closed contact opens and separates.
Normally closed contacts close.

Since the impedance of the light emitting diode 9 decreases, the voltage division ratio decreases and the voltage to the operation display circuit 10 decreases.
brightness decreases. Thereby, it is possible to predict the deterioration state of the coil, that is, the life span, and it is possible to prevent accidents caused by burnout of the coil, which is safe.

Even if electromagnetic relays have different excitation voltage rated values, by adjusting the number of turns of the secondary coil 14, etc., the partial voltage of the secondary coil 14, that is, the voltage applied to the operation display circuit 10, can be made constant. Therefore, by manufacturing the operation display circuit IO as one type of component like the operation display circuit holding block 17 shown in FIG. It is possible to reduce the number of points and improve productivity.

Unlike the conventional motion display device shown in FIG. 4, by lowering the partial voltage of the secondary coil 14, the voltage applied to the motion display circuit 10 can be lowered.

Therefore, at the same time that a high voltage such as a surge voltage applied between the coil terminals 25a and 25b is applied to the light emitting diode 9, a partial voltage corresponding to the impedance ratio of the primary coil 13 and the secondary coil 14 is applied to the relay section. It is applied to the operation display circuit 10 via 15a15b. As a result, the light emitting diode 9 emits light, confirming that the electromagnetic relay is in operation.

If the primary coil I3 were to be disconnected, no current would flow through the primary coil 13 or even the secondary coil 14, so the electromagnetic relay would not operate and the light emitting diode 9 would not emit light. Therefore, an operation display that matches the operation of the electromagnetic relay is performed.

Further, if the secondary coil 14 is disconnected and the result is NO, the voltage applied to the operation display circuit 10 changes, so the brightness of the light emitting diode 9 changes. As a result, the secondary coil 14
It is possible to detect that an abnormality has occurred.

In this embodiment, the secondary coil 14 is wound on the inside closer to the iron core 2 than the primary coil 13, so the temperature is high.
Easy to deteriorate. Therefore, after long-term use, the secondary coil 14 will deteriorate first, and the secondary coil 1 will not be added, so there is no risk of failure. Further, even in a coil operated at a high voltage, the power consumption of the current limiting resistor 8 can be reduced.

(Effect of the invention) As is clear from the above explanation, claims 1 and 2
According to the invention, since the light emitting element does not emit light if there is a disconnection in the coil, a reliable operation display corresponding to the operation of the electromagnetic relay is performed.

Further, by changing the brightness of the light emitting element, it is possible to self-diagnose abnormalities such as disconnection of the secondary coil.

For electromagnetic relays with different excitation voltage specifications, this can be handled without changing the operation display circuit by changing the number of turns of the secondary coil, etc., so it is possible to standardize the parts for the operation display circuit. This will improve productivity.

Furthermore, since the voltage applied to the operation display circuit can be lowered by lowering the partial voltage of the secondary coil, there are effects such as fewer failures and lower power consumption.

In particular, according to the invention according to claim 2, the life span of the light emitting element can be predicted based on changes in the brightness of the light emitting element, and accidents caused by burnout of the coil can be prevented, resulting in a safe effect. .

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an operation display device according to the present invention, FIG. 2 is a perspective view of an electromagnetic relay equipped with an operation display device according to the present invention, and FIG. 3 is a diagram of a conventional operation display device for an AC electromagnetic relay. Circuit Diagram FIG. 4 is a circuit diagram of a conventional operation display device for a direct current electromagnetic relay. 2 Iron core, 9 - Light emitting diode (light emitting element), 1O operation display circuit, I3 - Primary coil, 14 - Secondary coil.

Claims (2)

[Claims] (1) The excitation coil is divided into a primary coil and a secondary coil and wound around an iron core, the primary coil and the secondary coil are connected in series, and an operation display circuit having a light emitting element is attached to the secondary coil. An operation display device for electromagnetic relays, characterized in that they are connected in parallel. (2) The operation display device for an electromagnetic relay according to claim 1, wherein the secondary coil is wound inside the primary coil.