JPH0525645U - Electromagnetic relay - Google Patents

Abstract

(57) [Summary] [Structure] Coil (6), armature (4), iron core (3), and strip-shaped contact spring (C2) fixed to the armature (4) Movable contact (C1) at the end And a make contact (A1) and a break contact (B1) that are fixedly installed facing the movable contact (C1), respectively, and a movable contact (C3) from the supporting portion (C3) of the strip-shaped contact spring (C2). C1) Dispose the auxiliary contact member (12) on the strip-shaped contact spring or armature corresponding to the auxiliary contact portion (11) closer to it, and this auxiliary contact member is normally attached to the armature or auxiliary contact portion. The movable contact that does not come into contact
(C1) and the make contact (A1) only when the auxiliary contact member is in contact with the armature or the auxiliary contact portion and fixed to the movable contact (C1) and the make contact (A1) The configuration is such that they can be separated. [Effect] In the normal state, the auxiliary contact member does not participate in the relay operation, but when the contact is fixed, the auxiliary contact member naturally contacts the auxiliary contact portion of the belt-shaped contact spring, thereby fixing the contact. The reliability of the electromagnetic relay is improved because it is solved and it can be reliably separated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electromagnetic relay, and more specifically, when a movable contact and a make contact or a break contact are fixed by fusion or the like, this is eliminated to surely separate the movable contact from the make contact or the break contact. The present invention relates to an electromagnetic relay having a highly reliable contact structure that opens a circuit.

[0002]

[Prior Art]

 Electromagnetic relays are widely used for control circuits for railway signals, remote control of various electric devices, sequential control, supply control of large current, etc. Especially in applications where malfunctions such as control of industrial robots and signal systems of train monitoring equipment lead to danger of human life and large-scale damage, the so-called make contact that forms a closed circuit when energized is equipped with an electromagnetic relay. It is used by controlling each main device via the power supply and stopping the excitation of the electromagnetic relays in the event of a failure or emergency to stop the power supply to all parts at once. As a matter of course, the electromagnetic relay used for such applications requires high reliability.

An example of a conventional electromagnetic relay is shown in FIG. The hinge-type electromagnetic relay 50 forms a magnetic circuit by a yoke 2, an iron core 3 fixed to the yoke 2, and an armature 4 hinged to the upper end of the yoke 2, and forms a bobbin 8 on the iron core 3. The armature 4 is attracted to the iron core 3 by an electromagnetic attraction force generated by energizing the coil 6 wound with the coil interposed therebetween. At this time, the movable contact C1 provided at one end of the strip-shaped contact spring C2 attached to the armature 4 via the insulating base 5 also moves and comes into contact with the oppositely arranged make contact A1, and the strip-shaped contact spring C2 side. The terminal C and the terminal A on the make contact A1 side are electrically connected to each other to form a conductive path. Note that 1 is the case of the electromagnetic relay. Further, when the coil 6 is not excited, the armature 4 and thus the strip contact spring C2 is returned to the break contact B1 side by the pulling force of the return spring 7 (coil vane).

Various controlled devices are connected to the power source 15 via the terminals C and A (through so-called make contacts), and the winding terminals D and D ′ of the exciting coil 6 are passed through switches (not shown). Is connected to the power supply or the output of the control circuit to be controlled and driven. Therefore, the operation / non-operation of the controlled device connected is controlled by turning the electromagnetic relay 50 on / off. Although the break contact B1 and the terminal B following the break contact B1 are not used in the illustrated example, it is conceivable to connect a controlled device to the break contact side.

As described above, in the conventional electromagnetic relay 50, its contact structure is such that the movable contact C1 at the tip end is moved to the break contact B1 side by the tensile force of the return spring 7 through the armature 4 and thus the strip contact spring C2. It has a structure to restore it.

By the way, the contacts of the electromagnetic relay may be unintentionally stuck during use for various reasons. That is, there is a case where an unintended large current flows to the contact and the contact melts and sticks (fusion), and a high-viscosity oil component adheres to the contact along with dust etc. There are also cases where the adhesive is fixed. When the contact (for example, make contact) is thus fixed, the belt-shaped contact spring C2 is deformed even though the excitation is stopped and the armature 4 is restored as shown in the side view of FIG. A state in which the contact that has been opened cannot be opened appears. This means that the important control such as the stoppage of the following equipment is not performed as intended, which is a dangerous and serious problem that could lead to a major accident.

[0007]

[Problems to be solved by the device]

 The present invention has been made in view of the drawbacks of the above-described conventional electromagnetic relay, and even if the movable contact and the make contact or the movable contact and the break contact are fixed by fusion or the like, this is solved by itself. Therefore, it is an object of the present invention to propose an electromagnetic relay having a highly reliable contact structure that can separate the movable contact and the corresponding contact and surely open the desired contact circuit in response to the control signal.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, an electromagnetic relay is provided with a coil 6, an armature 4, an iron core 3, and a strip-shaped contact spring C2 fixed to the armature 4 by a support C3, and its end movable. It has a contact point C1, a make contact point A1 and a break contact point B1 that are fixed to face each other, and a return spring 7, and has a strip shape corresponding to an auxiliary contact portion 11 closer to the movable contact point C1 than the supporting portion C3 of the strip contact spring C2. Auxiliary contact members 12, 13, 14 are provided on the contact spring C2 or the armature 4, and the auxiliary contact members 12, 13, 14 do not normally contact the armature 4 or the auxiliary contact portion 11, but Only when the movable contact C1 and the make contact A1 are unintentionally fixed to each other, the auxiliary contact members 12, 13, 14 contact the armature 4 or the auxiliary contact portion 11 and are fixed to each other. Separated from contact A1 To make up Gotoku Mel.

In another invention of the present application, an electromagnetic relay is composed of a coil 6, an armature 4, an iron core 3, and a strip-shaped contact spring C2 fixed to the armature 4 at a support portion C3, and a movable contact C1 at its end. , A make contact A1 and a break contact B1 which are fixed to face each other, and a return spring 7, and correspond to an auxiliary contact portion 11 closer to the movable contact C1 than the supporting portion C3 of the contact spring C2. Auxiliary contact members 13 and 14 are arranged on C2 or the armature 4. The auxiliary contact members 13 and 14 do not normally contact the auxiliary contact portion 11, but the movable contact C1 and the break contact B1 are Only when they are unintentionally fixed to each other, the auxiliary contact members 13 and 14 contact the auxiliary contact portion 11 so as to separate the movable contact C1 and the break contact B1 from each other.

In still another three inventions of the present application, in any one of the above-mentioned configurations, an electromagnetic relay, in particular, a configuration in which the auxiliary contact member is an insulator fixed to the strip-shaped contact spring C2, or the auxiliary contact member is used. The contact member is made of an insulator fixedly mounted on the armature 4, or the auxiliary contact member is made of a plate spring fixed to the support portion C3 and extending to the auxiliary contact portion 11.

[0011]

In each of the electromagnetic relays having the above-described configurations, the auxiliary contact member does not normally participate in the relay operation, but when the contact is stuck, the auxiliary contact member is strip-shaped. A force is automatically applied to the auxiliary contact part of the contact spring, and this force is also transmitted to the contact part to eliminate the fixed state and separate the contact part securely.

[0012]

【Example】

 Hereinafter, the present invention will be described in detail. Hereinafter, the present invention will be described in detail based on embodiments with reference to the accompanying drawings. In addition, in each of the drawings including the already-existing drawings, the same reference numerals denote the same or equivalent parts. FIG. 1 (a) is a partial cross-sectional side view of an electromagnetic relay 20 according to an embodiment of the present invention, and FIG. 1 (b) is an enlarged perspective view of a contact main part such as an armature 4. In the figure, 1 is a case of an electromagnetic relay (including a transparent cover 1 '), 2 is a yoke, 3 is an iron core, and a coil 6 is wound around the iron core 3 via a bobbin 8. Both ends of this coil 6 are connected to coil excitation terminals D and D '(not shown in the wiring diagram). Reference numeral 4 denotes an armature that is hinge-coupled to the upper end of the yoke 2, and the armature 4 has a plurality of strip-shaped contact springs C 2 (4 in the figure) on the side opposite to the iron core 3 via an insulating member 5. It is fixed. The strip contact spring C 2 has a movable contact C 1 at one end and is supported by a support C 3 and the other end is connected to a terminal C fixed to the case 1 (not shown). An auxiliary contact member 12, which will be described in detail later, is attached to the strip contact spring C2.

A terminal A is arranged and fixed on the iron core side of the movable contact C1, and a make contact A1 is arranged at the end portion so as to face the movable contact C1. Further, a terminal B is arranged and fixed on the side opposite to the iron core 3 with the movable contact C1 interposed therebetween, and a make contact B1 is arranged at the end portion so as to face the movable contact C1. The armature 4 is biased by a return spring 7 in a direction away from the iron core 3.

In the present embodiment, the auxiliary contact member 12 made of an insulating material is provided at a part of the band contact spring C2 closer to the movable contact C1 than the supporting part C3 supporting the band contact spring C2, that is, the auxiliary contact part 11. Is fixed. In the normal state, the auxiliary contact member 12 does not always contact the armature 4 because a substantially constant gap is maintained between the respective parts regardless of the operating state of the electromagnetic relay 20, but as will be described later, the auxiliary contact member 12 is connected to the movable contact C1, for example. The thickness is appropriately set so that the make contact A1 is brought into contact with the armature 4 (auxiliary contact portion 11) when the make contact A1 is unintentionally fixed due to fusion or the like.

With the above-described configuration, the electromagnetic relay 20 of the embodiment normally functions in the same manner as the conventional one and performs the relay operation. That is, when the coil 6 wound around the iron core 3 is energized from the excitation terminals D and D'and excited, the armature 4 is generated by the electromagnetic attraction force generated by the magnetic circuit formed by the yoke 2, the core 3 and the armature 4. Adsorb on the iron core 3. Therefore, the movable contact C1 moves simultaneously and comes into contact with the make contact A1 to close the make contact circuit. When the coil 6 is not excited, the armature 4 is urged by the pulling force of the return spring means 7, so that the armature 4 is returned to the break contact B1 side and the movable contact C1 and the break contact B1 come into contact with each other. The auxiliary contact member 12 has no influence on the operation in such a normal state.

However, when the movable contact C1 and the make contact A1 or the break contact B1 are fixed to each other due to an accident such as fusion, the auxiliary contact member 12 functions effectively. That is, even if the movable contact C1 and the make contact A1 are fused under the excited state as shown in FIG. 1A, if the excitation is stopped to open the contact, the corresponding figure is obtained. Since the armature 4 is biased by the return spring 7 as shown in FIG. 2 (a), the armature 4 is separated from the iron core 3 and the auxiliary contact member 12 fixed to the belt-shaped contact spring C2 whose tip is fixed by itself is automatically attached. Abut. Then, a force (separation force) is applied to the fixed portion via the strip contact spring C2. Since the force for urging the movable contact C1 is sufficiently stronger than in the normal state, the fixed state can be eliminated and the movable contact C1 and the make contact A1 are separated and the contact circuit is opened as shown in FIG. 2 (b). ..

By the way, even if the auxiliary contact member is provided on the armature 4 side, the auxiliary contact member functions similarly. FIG. 3 is a partially sectional side view showing an electromagnetic relay 30 according to another embodiment of the present invention. The auxiliary contact member 13 made of an insulator is different from the previous embodiment in the auxiliary contact portion of the strip contact spring C2. It is arranged at a position corresponding to 11 on the armature 4. The auxiliary abutment member 13 is a member having a substantially E-shaped cross section in which the central portions of the two parallel plate-shaped portions are connected to each other, and one of the outer side surfaces of the parallel plate-shaped portions is placed at a predetermined position on the armature 4. Two strip-shaped contact springs C2 are arranged in the space between the fixed and parallel plate-shaped portions. In the normal state, regardless of the operating state (excitation or non-excitation) of the electromagnetic relay, a constant gap is always maintained with the strip-shaped contact spring C2 so that the contact does not come into contact, but due to an accident such as fusion of the movable contact C1 and the make contact A1. In case of sticking, the movable contact point C1 and the break contact point B1 are fused so that the inner side surface of the parallel plate-like portion on the armature 4 side comes into contact with the auxiliary contact portion 11 of the band-shaped contact point spring C2. In the case of sticking due to an accident such as wearing, the parallel plate-shaped portions on the side farther from the armature 4 contact the auxiliary contact portion 11 of the strip-shaped contact spring C2, respectively. The shape and dimensions are set so that the inner surface of is located.

With the above-described configuration, in the electromagnetic relay 30, the movable contact C1 and the make contact A1 are fixed to each other as in the previous embodiment, and in addition to the case where the movable contact C1 and the break contact B1 are fixed to each other. Only in this case, the auxiliary contact portion 11 contacts the strip-shaped contact spring C2 to release the fixed state of the contacts and separate the contacts. In addition, it is not preferable to use a movable contact C1 and a break contact B1 to connect a load, which is not a preferable form of use from a fail-safe viewpoint.

Although the auxiliary contact member 13 having a V-shaped cross-section fixed to the armature 4 is used in the above-described embodiment, the fixed state is canceled only by making the fixed contact between the make contact A1 side and the movable contact C1. If so, an auxiliary contact member may be sufficient by simply fixing an insulator of a suitable height to a predetermined position of the armature 4.

Next, FIG. 4 is a partial cross-sectional side view showing another embodiment of the present invention. In this embodiment electromagnetic relay 40, the rigidity is higher than the rigidity exhibited by the strip contact spring C2 as the auxiliary contact member 14. A parent spring exhibiting rigidity is used and is supported by the supporting portion C3 together with the strip-shaped contact spring C2. The parent spring (auxiliary contact member) 14 surrounds the strip-shaped contact spring C2 from both sides, and the tip extends to the auxiliary contact portion 11 of the strip-shaped contact spring and is positioned at a predetermined distance from this. Therefore, in the normal state, a constant gap is always maintained irrespective of the operation of the electromagnetic relay and the tip of the parent spring 14 does not contact the strip contact spring C2 (at the auxiliary contact portion 11), but the movable contact C1 and the make contact A1, for example. If the sheet is fixed due to an accident such as fusion, the stripped contact spring C2 is contacted (at the auxiliary contact portion 11) and a stronger force than usual is applied to cancel the fixed state. When the break contact B1 side is stuck, the stuck state is similarly canceled. Needless to say, the unnecessary side of the two parent springs may be omitted if necessary. As described above, in each of the inventions of the present application, the auxiliary contact member is provided to increase the rigidity of the strip-shaped contact spring and increase the opening force of the contact only when the contact is fixed. Has realized a highly reliable electromagnetic relay that eliminates this problem.

[0021]

[Effect of the device]

 According to the respective inventions of the present application, as described above with reference to the embodiments, since the electromagnetic relay has the auxiliary contact member, the auxiliary contact member does not normally participate in the relay operation, but the contact is fixed. When this occurs, the auxiliary contact member naturally contacts the auxiliary contact portion of the strip-shaped contact spring and exerts a force, which is also transmitted to the contact portion, thereby canceling the fixed state and opening the contact securely. Therefore, it is possible to obtain a highly reliable electromagnetic relay.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view and a perspective view of an essential part showing an embodiment of an electromagnetic relay of the present invention.

FIG. 2 is a partial cross-sectional side view illustrating the operation of the electromagnetic relay of FIG.

FIG. 3 is a partial cross-sectional side view and an essential part perspective view showing an embodiment of an electromagnetic relay according to another invention of the present application.

FIG. 4 is a side view, partly in section, showing an embodiment of an electromagnetic relay according to yet another invention of the present application.

FIG. 5 is a partial cross-sectional side view showing the structure of a conventional electromagnetic relay.

FIG. 6 is a partial cross-sectional side view for explaining the operation of the conventional electromagnetic relay.

[Explanation of symbols]

20, 30, 40 ... Electromagnetic relay, 2 ... Yoke, 3 ... Iron core, 4 ... Armature, 6 ... Coil, 7 ... Return spring, 1
1 ... Auxiliary contact portion, 12, 13, 14 ... Auxiliary contact member,
C1 ... movable contact, C2 ... strip contact spring, C3 ... support, A1 ... make contact, B1 ... break contact.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuya Shibata 1-13-8 Kamikizaki, Urawa-shi, Saitama Nihon Signal Co., Ltd.

Claims (5)

[Scope of utility model registration request] 1. A coil (6) is excited to form an armature (4) in an iron core.
The strip contact spring (C2) fixed to the armature (4) at the support (C3) by being attracted to (3) and the movable contact (C1) at the end facing each other are fixed to the make contact ( When the coil (6) is not energized, the armature (4) is moved away from the iron core (3) and the movable contact (C1). The make contact (A1)
In the electromagnetic relay that keeps in contact with the break contact (B1), the auxiliary contact part (11) closer to the movable contact (C1) than the support part (C3) of the strip contact spring (C2) Auxiliary contact members (12, 13, 14) are arranged on the strip contact spring (C2) or armature (4), and the auxiliary contact members (12, 13, 14) are normally in contact with the armature (4) or The auxiliary contact member (12, 13, 14) does not come into contact with the auxiliary contact portion (11), but only when the movable contact (C1) and the make contact (A1) are fixed against each other against the intention. (4) An electromagnetic relay configured so as to separate the movable contact (C1) fixed by contacting the auxiliary contact portion (11) from the make contact (A1). 2. A coil (6) is excited to energize an armature (4) as an iron core.
The strip contact spring (C2) fixed to the armature (4) at the support (C3) by being attracted to (3) and the movable contact (C1) at the end facing each other are fixed to the make contact ( When the coil (6) is not excited, the armature (4) is moved away from the iron core (3) and the movable contact (C1). The make contact (A1)
In the electromagnetic relay that keeps in contact with the break contact (B1), the auxiliary contact part (11) closer to the movable contact (C1) than the support part (C3) of the strip contact spring (C2) Auxiliary contact member (13, 14) is arranged on the strip contact spring (C2) or armature (4), and this auxiliary contact member (13, 14) normally contacts the auxiliary contact portion (11). However, only when the movable contact (C1) and the break contact (B1) are unintentionally fixed to each other, the auxiliary contact member (13,
4) comes into contact with the auxiliary contact part (11) and is fixed to the movable contact (C
An electromagnetic relay configured so that 1) and the break contact (B1) are separated from each other. 3. The belt-shaped contact spring (C
The electromagnetic relay according to claim 1, which is made of an insulating material fixed to 2). 4. The electromagnetic relay according to claim 1, wherein the auxiliary contact member is made of an insulating material fixed to the armature (4). 5. The electromagnetic relay according to claim 1, wherein the auxiliary contact member is a plate-like spring fixed to the support portion (C3) and extending to the auxiliary contact portion (11).