JPH0770283B2 - Electromagnetic relay - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an electromagnetic relay.

[0002]

2. Description of the Related Art As an electromagnetic relay, for example, a contact spring set consisting of a fixed contact spring and a movable contact spring arranged in parallel, an electromagnet device for contacting and separating the movable contact spring with the fixed contact spring, and an operating direction by the electromagnet device. Have a return spring that biases the movable contact spring in the opposite direction. By the way, in the above-mentioned prior art, when the return spring is damaged, no consideration is given to the position of the movable contact spring when the electromagnet device is de-energized.

[0003]

Therefore, in the above-mentioned prior art, when the return spring is damaged, when the electromagnet device is de-excited, the movable contact spring inadvertently abuts the fixed contact spring and the electromagnetic contact is generated. In reality, it is difficult to understand the damage of the return spring from the outside as well as the risk of causing malfunction of the device controlled by the relay. An object of the present invention is to provide an electromagnetic relay that can solve the above problems.

[0004]

In order to solve the above problems, a feature of the present invention resides in that a contact spring set including a fixed contact spring and a movable contact spring arranged in parallel, and a movable contact spring having a fixed contact spring. In which a movable contact spring is separated from a corresponding fixed contact spring in a free state, in a device having an electromagnet device to be brought into contact with and separated from each other and a return spring for biasing the movable contact spring in a direction opposite to the operation direction of the electromagnet device. There is a point. In addition, a plurality of contact spring sets may be provided, and one contact spring set may serve as an open / close switch in the drive circuit of the electromagnetic relay monitoring alarm.

[0005]

When the return spring is damaged and the electromagnet device is de-energized, the movable contact spring becomes free and separates from the fixed contact spring.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 7 show an electromagnetic relay, which includes a housing 1, a plurality of contact spring sets 2 to 7,
It has an electromagnet device 8, an operating member 9, a return spring 10, and a protective cover 11.

The housing 1 constitutes the left side portion of the electromagnetic relay and is integrally molded of an insulating material, for example, a hard synthetic resin. The housing 1 has a rectangular parallelepiped base portion 13, a right outer wall 14 standing from the right end portion of the base portion 13 and partitioning the contact spring sets 2 to 7 and the electromagnet device 8, and the left end of the base portion 13. Left outer wall 15 which is erected from the base portion, both outer wall 14 which is erected from the base portion 13,
A barrier wall 16 for partitioning the space between the front and rear 15 and both outer side walls 14,
Partition walls 1 addressed to the front and rear for partitioning the front and rear spaces defined by the blocking wall 16 between 15 in the left-right direction, respectively.
7 and three front and rear intermediate walls 18, and a ceiling wall 19 connecting the upper ends of the walls 14 to 18. The housing 2
In the front and rear portions of the partition wall 17 and the intermediate wall 18, the intermediate wall 18, the partition wall 17, the intermediate wall 18, ...
Are arranged in this order. As a result, inside the housing 1, in the front and rear spaces, between the right outer wall 14 and the right partition wall 17, between adjacent partition walls 17, and between the left partition wall 17 and the left outer wall 15 are opened forward or backward. Six contact spring set chambers 20 are formed, and the interior of each chamber 20 is further divided by the intermediate wall 18 into a fixed contact spring chamber 20A and a movable contact spring chamber 20B. Notches 14A, 16A, 17A, 18A for actuating members are provided on the upper portion of the right outer wall 14, the right end portion of the blocking wall 16, the partition walls 17, and the upper portions of the intermediate walls 18, respectively.
Is formed over the entire length in the front-rear direction, and the right outer wall 1
4, the partition walls 17 and the intermediate walls 18 are vertically divided into two by the operating member notches 14A, 17A, 18A. The actuating member notch portion 18A of each intermediate wall 18 is formed to be larger than that of the partition wall 17, and the upper end edge portion of each actuating member notch portion 18A of each intermediate wall 18 is the top wall 1.
Upper stopper 1 for fixed contact spring that protrudes slightly downward from 9
8B, and the lower end edge of the operating member notch 18A is circular and serves as a fixed contact spring lower stopper 18C.

The contact spring sets 2 to 7 are erected from the base portion 13 of the housing 1, and the blocking wall 16 of the housing 1 is provided.
Are separated by the front contact spring sets 2 to 4 and the rear contact spring sets 5 to 7, and the contact spring sets 2 to 7 are also separated by the partition wall 17 in the left-right direction.
The contact spring sets 2 to 7 are separated from each other, and the swinging portions of the contact spring sets 2 to 7 are internally contained in the contact spring set chamber 20 of the housing 1. Each of the contact point spring sets 2 to 7 is composed of a fixed contact point spring 22 and a movable contact point spring 23, which are arranged side by side, respectively.
2, 23 are made of a conductive spring material. The fixed contact springs 22 and the movable contact springs 23 are erected from the base portion 13 of the housing 1, and the swinging parts thereof are respectively provided in the fixed contact spring chambers 20A and the movable contact spring chambers 20B. In addition to being internally contained, each fixed contact spring 22
Are pressed against the fixed contact spring upper / lower stoppers 18B and 18C to prevent the electromagnet device 8 from moving from the non-excited position to the corresponding movable contact spring 23 side.
A fixed contact portion 22A and a movable contact portion 23A are formed at the upper ends of the fixed contact springs 22 and the movable contact springs 23, respectively. These contact portions 22A and 23A constitute a normally open type a contact or a normally closed type b contact, and the contact spring sets 2 and 5 have b contacts 2A and 5A. 6, 7 are a contacts 3A, 4A, 6A, 7A
have. In addition, each movable contact spring 23 is in a vertical state in which it is separated from the corresponding fixed contact spring 22 in a free state. The base portion 13 of the housing 1
From the above, a fixed contact spring connection terminal 24 and a movable contact spring connection terminal 25 that come into contact with the fixed contact springs 22 and the movable contact springs 23 are provided below.

The electromagnet device 8 connects and disconnects each movable contact spring 23 to and from the corresponding fixed contact spring 22 via the actuating member 9, and constitutes the right side portion of the electromagnetic relay and is arranged on the right side of the housing 1. The coil 28 is provided around the iron core 27, has an L-shaped yoke 29 fixed to the lower end of the iron core 27, and an armature 31 locked to the upper portion of the yoke 29 via a hinge spring 30. .

The actuating member 9 is actuated by the electromagnet device 8 so that each movable contact spring 23 is fixed to the corresponding fixed contact spring 22.
The actuating member 9 is made of an insulating material, for example, a synthetic resin, and has a bifurcated shape. The actuating member 9 is formed into a bifurcated shape. The actuating member 9 is inserted into and engaged with the armature 31 and extends from the base portion 9A to the left. A pair of front and rear extending portions 9B and each extending portion 9B
A pair of front and rear protruding portions 9C protruding leftward from the left end of the
It consists of and. The base portion 9A is inserted into the operating member notches 14A and 16A of the right outer wall 14 and the blocking wall 16, and the extending portion 9B is provided at each partition wall 17 and the intermediate wall 18 and the operating member notches 17A and 18A. The left outer wall 15 is movably inserted in the left-right direction, and the left end portion of each extending portion 9B and each projecting portion 9B.
C projects from the left outer wall 15 to the left side thereof. An engagement recess 9D is formed in each extension 9B so that each movable contact spring 23 is engaged with the left and right in a relatively immovable manner. The width of the engagement recess 9D in the left-right direction increases as it goes downward. And the movable contact spring 23 by the actuating member 9
It does not hinder the swinging of.

The return spring 10 biases the actuating member 9 in a direction opposite to the actuation direction of the electromagnet device 8, that is, in the right direction. The return spring 10 has a generally V shape in a front view and an inverted U shape in a side view. The lower part is attached to the left end part of the base part 13 of the housing 1, and the upper end part is the extension part 9B of the operating member 9.
The projection 9C of the actuating member 9 is inserted into the upper end while contacting the left end of the. The protective cover 11 is integrally formed of an insulating material, for example, a transparent synthetic resin, has a hollow rectangular parallelepiped shape that opens only downward, and is detachably fitted and fixed to the entire electromagnetic relay from above. The front or rear side opening of the contact spring setting chamber 20 is closed.

According to the embodiment configured as described above, when the coil 28 of the electromagnetic relay is in the non-excited state, as shown in FIG. 1, the return spring 10 urges the operating member 9 to the right to operate. The base 9A of the member 9 is the yoke 2 of the electromagnet device 8.
9, the movable contact springs 23 in the contact spring sets 2 and 5 come into press contact with the corresponding fixed contact springs 22, and the fixed contact springs 22 are fixed contact spring upper / lower stoppers 18B. , 18C and the right side contacts 2A, 5A are closed, apart from the right side. Further, in the contact spring sets 3, 4, 6 and 7, each fixed contact spring 22 is in contact with the fixed contact spring upper / lower stoppers 18B and 18C and is separated from the corresponding movable contact spring 23.
The contacts 3A, 4A, 6A, 7A are in a separated state.

When a direct current is applied to the coil 28 in the above state, the coil 28 is excited and, as shown in FIG.
The upper part of the armature 31 is magnetically attracted to the iron core 27, the lower part of the armature 31 swings to the left, the actuating member 9 moves to the left against the return spring 10, and each engaged with the actuating member 9. The movable contact spring 23 also swings to the left. As a result, in the contact spring sets 2 and 5, the fixed contact springs 22 return to the positions where they come into contact with the fixed contact spring upper / lower stoppers 18B and 18C, but the movable contact springs 23 swing further to the left and The fixed contact spring 22 is separated from each other, and the b contacts 2A and 5A are separated.

Further, in the contact spring sets 3, 4, 6, 7
After each movable contact spring 23 comes into contact with the corresponding fixed contact spring 22, the fixed contact spring 22 is further swung to the left while being pressed, so that the fixed contact spring 22 moves the fixed contact spring upper and lower stoppers 18B, Separated from the 18C to the left, each a contact 3
A, 4A, 6A and 7A are closed. Next, the coil 28
When the coil 28 is de-energized by stopping the energization of the coil 28, the operating member 9 is moved to the right by the return spring 10, and the movable contact springs 23 are also swung to the right, as shown in FIG. The fixed and movable contact springs 22 and 23 are returned to their original positions, and the b contacts 2A and 5A of the contact spring sets 2 and 5 are closed.
Also, the contact springs 3, 4, 6, 7 of the contact springs 3A, 4
A, 6A and 7A are separated.

By the way, when the coil 28 is excited, for example, the fixed contact portion 22A of the a-contact 3A of the contact spring set 3 and the movable contact portion 23A may be welded due to a short-circuit current or the like. In this case, as shown in FIG. 3, when the coil 28 is de-energized, the return spring 10 moves the operating member 9 to the right side, and each movable contact spring 23 and the fixed contact spring 22 of the contact spring set 3 are also moved. Similarly, it swings to the right. In this movement process, the fixed contact spring 22 contacts the fixed contact spring upper / lower stoppers 18B and 18C to prevent the swing thereof, and thus the fixed contact spring 22 of the contact spring set 3 is welded. The contact spring 23 is also prevented from moving to the original position shown in FIG.

As a result, the movement of the actuating member 9 engaged with the movable contact spring 23 to the right is also affected, but since the movable contact spring 23 is elastically deformable, the fixed contact spring 22 is fixed. Upper / lower stopper for use 18B, 18C
From the time point of contact with, the operating member 9 further moves by the amount of bending of the movable contact spring 23 of the contact spring set 3. However, the movement amount of the actuating member 9 is, of course, smaller than that when the coil 28 is normally de-energized. As described above, from the time when the fixed contact spring 22 comes into contact with the fixed contact spring upper / lower stoppers 18B and 18C, the actuating member 9 further moves to the movable contact spring 2 of the contact spring set 3.
Since it moves by the amount of deflection of 3, contact spring set 4,
The a contacts 4A, 6A and 7A of 6 and 7 are separated.

Further, as described above, since the moving amount of the operating member 9 is smaller than that when the coil 28 is normally de-energized, the b-contacts 2A and 5A of the contact spring sets 2 and 5 are also closed. It is not done and stays in the open state. Although the above example is an example in which the a contact is welded, conversely to the above, when the coil 28 is not excited, for example, the b contact 2
Even when the fixed contact portion 22A of A and the movable contact portion 23A are welded, when the coil 28 is excited, the other b contact 5A
The a-contacts 3A, 4A, 6A, 7A are not closed, and are in an open state. As described above, when the coil 28 is excited or not excited, one contact spring set 2 to
When both contact springs 22 and 23 of 7 are welded, the coil 2
Even if the excitation state of No. 8 is opposite to that at the time of welding, the two contact springs 22 and 23 of the other contact spring sets 2 to 7 do not come into contact with each other,
There is little risk that the device controlled by the electromagnetic relay will malfunction.

Further, even if the fixed and movable contact springs 22 and 23 of the contact spring sets 2 to 7 are damaged due to the above-mentioned welding or the like, the contact spring sets 2 to 7 are provided in the housing 1 for the contact spring set chambers. 20. Each of the chambers 20 is individually contained internally, and the front or rear side opening of each chamber 20 is closed by the protective cover 11. Therefore, the fragments of the fixed / movable contact springs 22 and 23 are the contact spring setting chamber 20.
It is hard to stay inside and enter the other chamber 20. Therefore, due to the fragments of the fixed / movable contact springs 22 and 23, both contact springs 22 and 23 of the other contact spring sets 2 to 7 are
Is less likely to be short-circuited, and the debris is less likely to adversely affect the other contact spring sets 2 to 7 and the coil 28 of the electromagnet device 8.

Further, the return spring 10 may be damaged for some reason. In this case, as shown in FIG.
When the coil 28 is de-energized, each contact spring set 2-7
The movable contact springs 23 are in a vertical posture free state, and are separated from the fixed contact springs 22 and the b contacts 2A, 5
The A and each a-contact 3A, 4A, 6A, 7A are in a separated state. As described above, even if the return spring 10 is damaged, the movable contact spring 23 does not accidentally come into contact with the fixed contact spring 22, and it is possible to reduce the possibility of causing malfunction of the device controlled by the electromagnetic relay.

Next, a control circuit that actually uses the electromagnetic relay will be described with reference to FIG. FIG. 8 shows an electric motor control circuit using the electromagnetic relay, which is configured by connecting an operating circuit 35, a motor drive circuit 36, and an alarm drive circuit 37 in parallel. In the operation circuit 35, a normally closed type stop switch 39, a normally open type start switch 40 and an a-contact 4A of an electromagnetic relay connected in parallel, and a coil 28 are connected in series.
In the motor drive circuit 36, the a-contact 3A of the electromagnetic relay and the electric motor M are connected in series.

In the alarm drive circuit 37, the b contact 2A of the electromagnetic relay and an electromagnetic relay monitoring alarm L exemplified as a lamp are connected in series, and the contact spring set 2 serves as an open / close switch of the alarm drive circuit 37. Has been done. According to the control circuit, when the electric motor M is driven, the start switch 40 is closed. As a result, a DC current is applied to the coil 28 in the same manner as described above, and the amateur 31
Is activated, the actuating member 9 moves to the left, the movable contact spring 23 swings to the left, the b contact 2A is opened, and a
The contacts 3A, 4A are closed.

As a result, the operation circuit 35 constitutes a self-holding circuit, and even if the operation of the start switch 40 is released, the operation circuit 35 maintains a closed circuit and the motor drive circuit 36 also maintains a closed circuit. Then, the electric motor M is driven, but the alarm L is not driven. When the electric motor M is stopped, the stop switch 39 is opened and closed to open the operation circuit 35 to stop the energization of the coil 28 and the a-contact 4A to de-energize the coil 28. Then, the actuating member 9 is moved to the right by the return spring 10 to close the b contact 2A and open the a contacts 3A and 4A.

As a result, the electric motor M is stopped and the alarm L is turned on. Then, for example, the coil 28
When the a-contact 3A is welded due to some overload at the time of energizing the coil, if the stop switch 39 is opened, the coil 28 and the a-contact 4A are de-energized,
The coil 28 becomes non-excited, and as shown in FIG. 3, the return spring 10 moves the operating member 9 to the right side, and the a contact 3A
Only the welding keeps the closed state, but the b contact 2A,
All of the a contacts 4A are separated. As a result, the electric motor M does not stop, but if it is normal, the alarm L that should be turned on does not turn on, so that the operator can know that an abnormality has occurred in the device.

When the coil 28 is energized, the return spring 1
When 0 is broken, when the stop switch 39 is opened, the coil 28 and the a-contact 4A are de-energized, the coil 28 is de-energized, and the movable contact springs 23 are released.
However, the fixed contact springs 22
It will be in a state of being separated from. As a result, the b contact 2A, a
Both of the contacts 3A and 4A are in the open state, the operation circuit 35 is in the open circuit, the electric motor M is not accidentally redriven, and the alarm L is not turned on to notify the operator of the abnormality.

[0025]

As described in detail above, according to the present invention,
When the return spring is damaged, even if the electromagnet device is not excited, the movable contact spring does not accidentally come into contact with the fixed contact spring, and it is possible to reduce the risk of causing malfunction of the device controlled by the electromagnetic relay. Further, according to the second aspect, breakage of the return spring can be detected, and this breakage can be easily known from the outside.

[Brief description of drawings]

FIG. 1 is a front sectional view showing an embodiment of the present invention.

FIG. 2 is a front sectional view showing an embodiment of the present invention.

FIG. 3 is a front sectional view showing an embodiment of the present invention.

FIG. 4 is a front sectional view showing an embodiment of the present invention.

5 is a cross-sectional view taken along the line XX of FIG.

6 is a cross-sectional view taken along the line YY of FIG.

7 is a sectional view taken along the line ZZ of FIG.

FIG. 8 is a circuit diagram showing an embodiment of the present invention.

[Code]

1 ... Housing, 2-7 ... Contact spring set, 2A, 5A
... b contact, 3A, 4A, 6A, 7A ... a contact, 8 ... electromagnet device, 9 ... operating member, 9D ... engaging recess, 10 ... return spring, 11 ... protective cover, 14, 15 ... right / left outer wall 1
6 ... Blocking wall, 17 ... Partition wall, 18 ... Intermediate wall, 18B, 18
C ... Upper / lower stoppers for fixed contact springs, 20 ... Chambers for setting contact springs, 20A, 20B ... Chambers for fixed / movable contact springs, 22, 23 ... Fixed / movable contact springs, 2
2A, 23A ... Fixed / movable contact portion, 35 ... Operating circuit,
36 ... Motor drive circuit, 37 ... Alarm drive circuit, 39 ...
Stop switch, 40 ... Start switch, M ... Electric motor, L ... Electromagnetic relay monitoring alarm.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-51-15142 (JP, A) JP-A-59-158041 (JP, A) JP-A-46-4681 (JP, A) JP-A-6- 176674 (JP, A) JP-A-6-176675 (JP, A) Actually opened 55-50594 (JP, U) Actually opened 63-137431 (JP, U) Actually opened 1-104630 (JP, U) Actual Open Sho 56-21343 (JP, U) Actual Open Sho 57-138307 (JP, U) Japanese Patent Sho 36-2355 (JP, B1) Actual Sho 33-4955 (JP, Y1)

Claims (2)

[Claims] 1. A contact spring set comprising a fixed contact spring and a movable contact spring arranged in parallel, an electromagnet device for bringing the movable contact spring into and out of contact with the fixed contact spring, and a movable contact spring in a direction opposite to an operation direction of the electromagnet device. An electromagnetic relay in which a movable contact spring is separated from a corresponding fixed contact spring in a free state. 2. The electromagnetic relay according to claim 1, wherein a plurality of contact spring sets are provided, and one contact spring set is an open / close switch in a drive circuit of an alarm for monitoring an electromagnetic relay.