JP2005251607A - Electromagnetic switching device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent neglect of components, such as an elastomer contained in a lower frame, in an assembling process. <P>SOLUTION: In the electromagnetic switching device, an elastomer 8 is attached to a fixed iron core 4 through a supporting plate 7 and the fixed iron core 4 is contained in a lower frame 5. The elastomer 8 is held between the lower frame 5 and an electromagnetic coil 2. A through-hole 5b is formed in the position corresponds to the elastomer 8 of the lower frame 5 to check the elastomer 8 with eyes from the through-hole 5b after assembling the product. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electromagnetic switching device such as an electromagnetic contactor or an electromagnetic relay that holds a fixed iron core in a lower frame via an elastic body.

As this type of electromagnetic switch, an electromagnetic contactor disclosed in Patent Document 1 is known. 4 and 5 are respectively a front sectional view and a side sectional view of an electromagnetic contactor showing a conventional structure, and FIG. 6 is an exploded perspective view of FIG.
In the figure, reference numeral 1 denotes an electromagnetic contactor as an electromagnetic switch, in which a central leg of an E-type fixed iron core 4 is inserted into a bobbin 3 around which an electromagnetic coil 2 is wound, and the fixed iron core 4 is attached to a lower frame. 5 is housed by dropping.
A through hole 6 is provided in the thickness direction of the fixed iron core 4, and a support plate 7 is inserted into the through hole 6 so that both ends protrude from the through hole 6. In addition, elastic bodies 8 made of an elastic member such as rubber are attached to both ends of the portion of the support plate 7 protruding from the fixed iron core 4, and the elastic bodies 8 are attached to the bottom surface of the lower frame 5 and the bobbin 3 of the electromagnetic coil 2. And is held between the protrusions 3a.

The lower frame 5 is provided with a recess 5a having a projection area substantially equal to the back of the fixed iron core 4, and the elastic sheet 10 is laid in the recess 5a with the back of the fixed iron core 4 and the gap 9.
A movable contact support 13 that is slidably guided by an upper frame 18 is connected to a movable iron core 11 facing the fixed iron core 4 by a connecting plate 12. A return spring 14 is interposed between the movable iron core 11 and the bobbin 3 of the electromagnetic coil 2. A movable contact 15 is inserted into the movable contact support 13 and is held by a contact spring 16. A fixed contact 17 is fixed to the upper frame 18 so as to face the movable contact 15, and the movable contact 15 and the fixed contact 17 are covered with a contact cover 19.
In FIG. 6, 21 is a terminal screw of the fixed contact 17, 22 is an auxiliary movable contact, 23 is an auxiliary fixed contact, and 24 is a tightening wire spring that connects the upper frame 18 and the lower frame 5.

In such a configuration, when the electromagnetic coil 2 is excited, the fixed iron core 4 and the movable iron core 11 attract each other, the movable iron core 11 moves and collides with the fixed iron core 4, and the movable contact 15 contacts the fixed contact 17. .
At this time, the elastic body 8 on the upper surface of the support plate 7 is compressed by the support plate 7 and the projection 3a of the bobbin 3 to act as a buffer. When the collision between the iron cores 4 and 11 is completed, the iron cores 4 and 11 are united and collide with the bottom surface of the lower frame 5. At this time, the elastic body 8 on the lower surface of the support plate 7 is compressed by the lower frame 5 and the support plate 7. It acts as a shock absorber and absorbs the kinetic energy of both iron cores 4 and 11 by the elastic sheet 10 so that the impact when the movable iron core collides with the fixed iron core is reduced. Vibration can be prevented.
When the excitation of the electromagnetic coil 2 is released, the movable iron core 11 is separated from the fixed iron core 4 by the force of the return spring 14, and the movable contact 15 is separated from the fixed contact 17 to return to the illustrated state.

If a sufficient effect can be obtained with the elastic body 8 alone, the elastic sheet 10 can be omitted.
In the case of a direct current type electromagnetic contactor, the elastic body 8 and a surge absorbing ring of a surge absorbing element that absorbs a surge may be arranged on the bottom surface of the lower frame.
No. 7-29553

By the way, in the electromagnetic switching device of the conventional structure described above, since the fixed iron core is housed in the lower frame by dropping, the electromagnetic coil may be burned out by overvoltage or an external surge, or on the adsorption surface of the fixed iron core with the movable iron core. The fixed iron core can be easily replaced when a problem such as spilling foreign matter such as chips or fiber scraps occurs.
The replacement operation of the fixed iron core is performed by removing the upper coil and removing the electromagnetic coil and the fixed iron core housed in the lower frame, and once removing the support plate and the elastic body inserted in the through hole of the fixed iron core from the fixed iron core. . Then, the support plate and the elastic body are attached to a new fixed iron core, the fixed iron core and the electromagnetic coil to which the elastic body and the support plate are attached are incorporated in the lower frame, and the upper frame is attached.
However, in the replacement operation of the fixed iron core, the support plate and the elastic body are also very small parts. When the support plate and the elastic body removed from the fixed iron core are attached to the new fixed iron core, the support plate and the elastic body are mistakenly attached. I forgot to assemble my body into a new fixed iron core.

Even if you forget to assemble the elastic body, once you attach the upper frame, it will not be visible from the outside, so it will not be found in the general confirmation test after assembly. There was a possibility that the main body of the magnetic contactor and the device incorporating the same would be damaged without performance.
In addition, in the case of a direct current type electromagnetic contactor, in addition to the elastic body, a surge absorbing ring of a surge absorbing element may be housed and used in the lower frame. If there is, there is a possibility that the basic performance may not be obtained in the actual use state and the electromagnetic contactor body and the device incorporating the same may be damaged.
Accordingly, an object of the present invention is to provide an electromagnetic switching device that can reliably prevent forgetting to assemble parts such as an elastic body housed in a lower frame.

In order to solve the above problem, as in the invention described in claim 1, the leg portion of the fixed iron core is inserted into the bobbin around which the electromagnetic coil is wound, and the elastic body is inserted into the fixed iron core via the support plate. In an electromagnetic switching device in which the fixed iron core is housed in the lower frame and the elastic body is sandwiched and held between the lower frame and the electromagnetic coil, the elastic core corresponds to the elastic body of the lower frame. A through hole is provided at the position.
In the electromagnetic switching device, the through hole may be sealed with an elastic body, or the elastic body may have a color different from that of the lower frame.
Further, as in the invention described in claim 4, a through hole is provided at a position corresponding to the surge absorbing ring of the surge absorbing element of the lower frame.

According to the first aspect of the present invention, after assembling the product, it is ensured that the elastic body housed in the lower frame is forgotten by visually confirming the presence or absence of the elastic body from the through hole provided in the lower frame. Can be prevented.
According to the invention described in claim 4, it is possible to prevent forgetting to assemble the surge absorption ring housed in the lower frame by visually confirming the presence or absence of the surge absorption ring from the through hole provided in the lower frame. Can do.

The embodiment of the present invention will be described below with reference to FIGS.
FIG. 1 is a front sectional view of an electromagnetic contactor showing an embodiment of the present invention, FIG. 2 is a side sectional view of FIG. 1, and FIG. 3 is a perspective view of the lower frame of FIG.
In the figure, 20 is an electromagnetic contactor as an electromagnetic switching device showing an embodiment of the present invention, and a central leg of an E-type fixed iron core 4 is inserted into a bobbin 3 around which an electromagnetic coil 2 is wound as in the conventional case. The support plate 7 is inserted into the through hole 6 of the fixed core 4 so that both ends protrude from the fixed core 4. Further, an elastic body 8 is attached to each portion of the support plate 7 protruding from the fixed iron core 4, and the elastic body 8 is sandwiched and held between the lower frame 5 and the projection 3 a provided on the bobbin 3. .
This embodiment is different from the conventional example in that through holes 5b and 5b are provided at positions corresponding to the elastic body 8 of the lower frame 5 so that the elastic body 8 can be seen from the outside.

In addition, since the basic structure of the electromagnetic contactor in this invention is the same as the electromagnetic contactor of the conventional structure shown in FIG. 4 thru | or FIG. 6, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.
In the figure, the lower frame 5 is provided with through holes 5b and 5b penetrating the bottom surface of the lower frame as shown in FIG. The through holes 5b and 5b are provided at positions corresponding to the elastic bodies 8 and 8 housed in the lower frame 5 shown in the exploded perspective view of FIG. The elastic bodies 8 and 8 accommodated in the lower frame 5 can be visually observed through 5b.
The elastic body 8 is disposed in the lower frame 5 so as to seal the through hole 5b. Therefore, dust or the like does not enter the lower frame 5 from the outside of the lower frame 5 through the through hole 5b.

In such a configuration, when a problem such as burning of the electromagnetic coil 2 or foreign matter adhering to the adsorption surface of the fixed iron core 4 with the movable iron core 11 occurs, the fixed iron core housed in the lower frame 5 is generated. Remove 4 and replace with a new fixed core.
In the replacement operation of the fixed iron core, first, the upper coil 18 is removed, the electromagnetic coil 2 and the fixed iron core 4 housed in the lower frame 5 are removed from the lower frame 5, and the support inserted into the through hole 6 of the fixed iron core 4 is supported. The plate 7 and the elastic body 8 are once removed from the fixed iron core 4. Next, the support plate 7 is inserted into a through hole of a new fixed iron core, and elastic bodies 8 are attached to both ends of the portion of the support plate 7 protruding from the fixed iron core 4. Then, after the new fixed iron core and the electromagnetic coil 2 to which the elastic body 8 and the support plate 7 are attached are dropped and stored in the lower frame 5, the assembly is completed by attaching the upper frame 18 to the lower frame 5.

If the assembly of the elastic body 8 attached to the fixed iron core via the support plate 7 is forgotten in the replacement work of the fixed iron core, there is a risk of causing a failure or the like in the state of implementation of the magnetic contactor. Therefore, in this embodiment, whether or not to forget to assemble the elastic body 8 and the support plate 7 in the fixed iron core 4 housed in the lower frame 5 after replacement of the fixed iron core is determined. It was made visible from.
In order to confirm whether the assembly of the elastic body 8 and the support plate 7 is not forgotten in the fixed iron core 4 housed in the lower frame 5, through holes 5b provided on the bottom surface of the lower frame 5 after the fixed iron core replacement work, The presence or absence of the elastic bodies 8 and 8 may be visually confirmed from 5b.
If the elastic body 8 can be seen from the through hole 5b provided in the lower frame 5, it can be seen that the assembly of the elastic body 8 and the support plate 7 is not forgotten. There is no risk of product failure due to forgetting.

Further, when the elastic body 8 and the support plate 7 cannot be seen from the through holes 5b and 5b, or when only one elastic body 8 is visible, it is understood that the elastic body 8 and the support plate 7 are forgotten to be assembled. Therefore, in that case, an operation of disassembling the electromagnetic contactor body and incorporating the elastic body 8 is performed again.
As described above, according to this embodiment, the presence or absence of the elastic body 8 is visually confirmed from the through hole 5b provided in the lower frame 5, thereby forgetting to set the elastic body 8 and the support plate 7 when the fixed iron core is replaced. Therefore, it is possible to prevent a product failure due to forgetting to assemble the elastic body 8 and the support plate 7 and to improve reliability.
In this embodiment, forgetting to assemble the elastic body when the fixed iron core is replaced has been mainly described. However, after the product is assembled, the presence or absence of the elastic body is visually confirmed from the through hole in the state after the product is assembled. You may make it prevent forgetting to assemble an elastic body.

Moreover, in the said Example, although the elastic body 8 and the lower frame 5 may be comprised by the same color, by making the elastic body 8 and the lower frame 5 into different colors, such as black and white, for example. The visual confirmation can be made easier to understand.
Further, in the case of a direct current type electromagnetic contactor, the elastic body and the surge absorbing ring of the surge absorbing element may be arranged and used on the bottom surface of the lower frame. In that case, a through hole is provided at a position corresponding to the surge absorbing ring of the lower frame, and the presence or absence of the surge absorbing ring is visually confirmed from the through hole.
According to such a configuration, it becomes possible to prevent forgetting to assemble the surge absorbing ring housed in the lower frame. In addition, you may make it provide both the through-hole for a surge absorption ring confirmation, and the through-hole for an elastic body confirmation in a lower frame.

Front sectional view of an electromagnetic contactor showing an embodiment of the present invention Side sectional view of the magnetic contactor shown in FIG. The perspective view which looked at the lower frame shown in Drawing 1 from the bottom side Front sectional view of a magnetic contactor showing conventional structure Side sectional view of the magnetic contactor shown in FIG. 4 is an exploded perspective view of the magnetic contactor shown in FIG.

Explanation of symbols

2 Electromagnetic coil 3 Bobbin 4 Fixed iron core 5 Lower frame 5b Through hole 7 Support plate 8 Elastic body

Claims (4)

A leg portion of the fixed iron core is inserted into a bobbin around which an electromagnetic coil is wound, and an elastic body is attached to the fixed iron core via a support plate. The fixed iron core is housed in the lower frame, and the elastic body is placed in the lower portion. In an electromagnetic switching device that is sandwiched and held between a frame and the electromagnetic coil,
An electromagnetic switch comprising a through hole provided at a position corresponding to the elastic body of the lower frame. The electromagnetic switching device according to claim 1, wherein the through hole is sealed with an elastic body. 3. The electromagnetic switch according to claim 1, wherein the elastic body has a color different from that of the lower frame. A leg of the fixed core is inserted into the bobbin around which the electromagnetic coil is wound, and an elastic body is attached to the fixed core via a support plate. In an electromagnetic switching device that is housed in a frame and that holds the elastic body between a lower frame and the electromagnetic coil,
An electromagnetic switch comprising a through hole provided at a position corresponding to a surge absorbing ring of the surge absorbing element of the lower frame.

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