JPH0341396Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to the structure of an electromagnetic relay, particularly a hermetically sealed relay.

As is well known, a hermetic seal relay has a structure as shown in the first example. In FIG. 1, one end of a mounting plate 3 having an L-shaped cross section is fixed to a bottom cover 2 to which a terminal 1 is fixed by soldering, and a yoke 5 to which a coil 4 is attached is attached to the other end of the mounting plate 3 by a screw 6.
is fixed. A spring mounting member 7 having an L-shaped cross section is fixed to one end of the yoke 5 by screws 8, and a terminal block 11 to which fixed contacts 9 and 10 are attached is fixed to the other end by screws 12, respectively. One end of a spring 13 is fixed to one end of the spring mounting member 7, and the spring 1
One end of a movable iron piece 14 is fixed to the other end of 3. The other end of the movable iron piece 14 is a magnetic pole 15 of the coil 4.
The spring mounting member 7 extends in the upper part thereof, and is rotatably supported by the other end of the spring mounting member 7 in the middle thereof. As a result, one end of the movable iron piece 14 is biased by the spring 13, and the other end can move toward and away from the magnetic pole 15. Furthermore, insulating members 16 and 17 are fixed to the movable iron piece 14 with screws 18, and one end of the movable piece 19 is held between these insulating members 16 and 17. The other end of the movable piece 19 is inserted between the fixed contacts 9 and 10, and is pressed against either of the fixed contacts 9 and 10 when the movable iron piece 14 and the magnetic pole 15 come into contact with each other. . In order to ensure the contact between the other end of the movable piece 19 and the fixed contacts 9 and 10, the rotation of the other end of the movable iron piece 14 using the other end of the spring mounting member 7 as a fulcrum is increased. As a result, the middle of the movable piece 19 is bent in the direction of rotation of the movable iron piece 14.
If this deflection is excessive, there is a risk that the other end of the movable piece 19 will jump out from between the fixed contacts 9 and 10.

In addition, the hinge point of the movable iron piece 14 is only pressed against the other end of the spring mounting member 7 by the restoring force of the spring 13 so that the movable iron piece 14 can rotate. Therefore, depending on the direction of the mechanical impact force when the electromagnetic relay is dropped, the movable iron piece 1
4 has the risk of resisting the restoring force of the spring 13 and coming off the hinge point.

In order to prevent this, a detachment prevention member 20 having a U-shaped cross section is provided. This detachment prevention member 20
One end is held between the yoke 5 and the other end of the mounting plate 3, and the other free end extends above the screw 18 at a constant distance A. And this interval A
is set in advance to be slightly larger than the moving distance of the screw 18 in normal use, that is, the distance of the movable iron piece 14 moving toward and away from each other. In other words, the purpose of the detachment prevention member 20 is not to restrict the movement of the movable piece 19 during normal use, but when the movable piece 19 is deformed by inadvertently dropping the relay, etc. As a result, the purpose is to perform the function when the amount of deflection of the movable iron piece 19 becomes excessive, and to prevent the movable iron piece from detaching.

However, the relay is entirely housed in a metal case 21, and has a structure in which deformation of the movable piece 19 due to impact cannot be confirmed from the outside. Moreover, the other end of the detachment prevention member 20 is a free end, and the structure is essentially weak against impact. Therefore, it is well known that it is necessary to manage and maintain the relay before use.

As described above, since it is impossible to know whether there is an abnormality in the relay other than by inspecting its electrical characteristics, there is a problem in that it takes time to detect a faulty relay.

This idea was made in view of the above-mentioned conventional problems, and the first and second protrusions that protrude from the movable iron piece toward the inner surface of the case are placed on the hinge point side and the free end side of the movable iron piece, respectively. The gap between the tip of the first protrusion and the inner surface of the case is smaller than the distance that the movable iron piece separates from the hinge point, and the gap between the tip of the second protrusion and the inner surface of the case is smaller than the normal movement distance of the movable iron piece. When the electromagnetic relay receives a mechanical shock, the first protrusion prevents the movable iron piece from separating from the hinge point, and the second protrusion prevents the movable iron piece from making abnormal contact and separation movements. The object of the present invention is to provide an electromagnetic relay that collides with the inner surface of the case based on its operation and emits abnormal noise to the outside.

Hereinafter, one embodiment of this invention will be described in detail based on the drawings (FIGS. 2 and 3). Note that the same parts as in FIG. 1 are denoted by the same reference numerals, and the explanation thereof will be omitted.

In FIGS. 2 and 3, the abutment plate 25 is fixed to the movable iron piece together with the insulating members 16, 17 and the movable piece 19 by screws 18, and the abutment plate 25 has a structure that protrudes toward the inner surface of the case 21. First and second protrusions 26 and 27 are formed, respectively. These protrusions 26 and 27 are connected to the contact plate 25
The first protrusion 26 is disposed on the hinge point side of the movable iron piece 14, and the second protrusion 27 is disposed on the free end side of the movable iron piece 14. The gaps B and C between the tips of these protrusions 26 and 27 and the inner surface of the case 21 can be adjusted by changing the inclination angles of the protrusions 26 and 27, respectively.
is made slightly larger than the moving distance of the movable iron piece 14 toward and away from the magnetic pole 15. Further, the gap B is made smaller than the distance at which the movable iron piece 14 separates from the hinge point when subjected to mechanical impact.

With this configuration, if a mechanical shock is applied to the electromagnetic relay and the internal structure is deformed, such as deformation of the movable piece 19, as a result, the moving distance of the movable iron piece 14 becomes longer. As a result, the second protrusion 27 collides with the inner surface of the case 21, and an abnormal noise is emitted to the outside. Therefore, during an operation test or the like after the equipment is delivered, the malfunctioning relay can be easily identified based on this abnormal noise. Further, even if the mechanical impact described above is applied, the first protrusion 26 reliably prevents the movable iron piece 14 from separating from the hinge point.

As explained above, according to this invention, since a protrusion that can be collided with is provided on the case, a faulty relay can be easily identified without conducting an electrical characteristic test, and the number of inspection steps can be significantly reduced. be. Furthermore, it is possible to eliminate the detachment prevention member that is deformed during assembly or caused by a manufacturing error, and has the effect that manufacturing and assembly are facilitated.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing a conventional electromagnetic relay, and FIGS. 2 and 3 are a partially sectional side view and a partially sectional front view showing an embodiment of the electromagnetic relay according to the invention. 4... Coil, 15... Magnetic pole, 14... Movable iron piece, 21... Case, 26... First protrusion, 27
...Second protrusion, B, C...Gap.

Claims (1)

[Scope of utility model registration request] In an electromagnetic relay that opens and closes contacts based on the contact/separation movement between a case, an electromagnet housed in the case, and a movable iron piece, first and second projections protruding from the movable iron piece toward the inner surface of the case are connected to the movable iron piece. provided on the hinge point side and the free end side, the gap between the first protrusion tip and the inner surface of the case is smaller than the distance that the movable iron piece leaves the hinge point, and the gap between the second protrusion tip and the inner surface of the case is movable. When the electromagnetic relay is subjected to a mechanical shock by making it slightly larger than the normal operating distance of the iron piece, the first protrusion prevents the movable iron piece from separating from the hinge point, and the second protrusion prevents the movable iron piece from separating from the hinge point. An electromagnetic relay characterized in that based on the movement of a movable iron piece that makes abnormal contact and separation movements, it collides with the inner surface of a case and emits an abnormal noise to the outside.